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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.util;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import static org.apache.hadoop.hbase.util.Order.ASCENDING;</span> |
| <span class="source-line-no">021</span><span id="line-21">import static org.apache.hadoop.hbase.util.Order.DESCENDING;</span> |
| <span class="source-line-no">022</span><span id="line-22"></span> |
| <span class="source-line-no">023</span><span id="line-23">import java.math.BigDecimal;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.math.MathContext;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.math.RoundingMode;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.nio.charset.Charset;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">028</span><span id="line-28"></span> |
| <span class="source-line-no">029</span><span id="line-29">/**</span> |
| <span class="source-line-no">030</span><span id="line-30"> * Utility class that handles ordered byte arrays. That is, unlike {@link Bytes}, these methods</span> |
| <span class="source-line-no">031</span><span id="line-31"> * produce byte arrays which maintain the sort order of the original values.</span> |
| <span class="source-line-no">032</span><span id="line-32"> * <h3>Encoding Format summary</h3></span> |
| <span class="source-line-no">033</span><span id="line-33"> * <p></span> |
| <span class="source-line-no">034</span><span id="line-34"> * Each value is encoded as one or more bytes. The first byte of the encoding, its meaning, and a</span> |
| <span class="source-line-no">035</span><span id="line-35"> * terse description of the bytes that follow is given by the following table:</span> |
| <span class="source-line-no">036</span><span id="line-36"> * </p></span> |
| <span class="source-line-no">037</span><span id="line-37"> * <table summary="Encodings"></span> |
| <span class="source-line-no">038</span><span id="line-38"> * <tr></span> |
| <span class="source-line-no">039</span><span id="line-39"> * <th>Content Type</th></span> |
| <span class="source-line-no">040</span><span id="line-40"> * <th>Encoding</th></span> |
| <span class="source-line-no">041</span><span id="line-41"> * </tr></span> |
| <span class="source-line-no">042</span><span id="line-42"> * <tr></span> |
| <span class="source-line-no">043</span><span id="line-43"> * <td>NULL</td></span> |
| <span class="source-line-no">044</span><span id="line-44"> * <td>0x05</td></span> |
| <span class="source-line-no">045</span><span id="line-45"> * </tr></span> |
| <span class="source-line-no">046</span><span id="line-46"> * <tr></span> |
| <span class="source-line-no">047</span><span id="line-47"> * <td>negative infinity</td></span> |
| <span class="source-line-no">048</span><span id="line-48"> * <td>0x07</td></span> |
| <span class="source-line-no">049</span><span id="line-49"> * </tr></span> |
| <span class="source-line-no">050</span><span id="line-50"> * <tr></span> |
| <span class="source-line-no">051</span><span id="line-51"> * <td>negative large</td></span> |
| <span class="source-line-no">052</span><span id="line-52"> * <td>0x08, ~E, ~M</td></span> |
| <span class="source-line-no">053</span><span id="line-53"> * </tr></span> |
| <span class="source-line-no">054</span><span id="line-54"> * <tr></span> |
| <span class="source-line-no">055</span><span id="line-55"> * <td>negative medium</td></span> |
| <span class="source-line-no">056</span><span id="line-56"> * <td>0x13-E, ~M</td></span> |
| <span class="source-line-no">057</span><span id="line-57"> * </tr></span> |
| <span class="source-line-no">058</span><span id="line-58"> * <tr></span> |
| <span class="source-line-no">059</span><span id="line-59"> * <td>negative small</td></span> |
| <span class="source-line-no">060</span><span id="line-60"> * <td>0x14, -E, ~M</td></span> |
| <span class="source-line-no">061</span><span id="line-61"> * </tr></span> |
| <span class="source-line-no">062</span><span id="line-62"> * <tr></span> |
| <span class="source-line-no">063</span><span id="line-63"> * <td>zero</td></span> |
| <span class="source-line-no">064</span><span id="line-64"> * <td>0x15</td></span> |
| <span class="source-line-no">065</span><span id="line-65"> * </tr></span> |
| <span class="source-line-no">066</span><span id="line-66"> * <tr></span> |
| <span class="source-line-no">067</span><span id="line-67"> * <td>positive small</td></span> |
| <span class="source-line-no">068</span><span id="line-68"> * <td>0x16, ~-E, M</td></span> |
| <span class="source-line-no">069</span><span id="line-69"> * </tr></span> |
| <span class="source-line-no">070</span><span id="line-70"> * <tr></span> |
| <span class="source-line-no">071</span><span id="line-71"> * <td>positive medium</td></span> |
| <span class="source-line-no">072</span><span id="line-72"> * <td>0x17+E, M</td></span> |
| <span class="source-line-no">073</span><span id="line-73"> * </tr></span> |
| <span class="source-line-no">074</span><span id="line-74"> * <tr></span> |
| <span class="source-line-no">075</span><span id="line-75"> * <td>positive large</td></span> |
| <span class="source-line-no">076</span><span id="line-76"> * <td>0x22, E, M</td></span> |
| <span class="source-line-no">077</span><span id="line-77"> * </tr></span> |
| <span class="source-line-no">078</span><span id="line-78"> * <tr></span> |
| <span class="source-line-no">079</span><span id="line-79"> * <td>positive infinity</td></span> |
| <span class="source-line-no">080</span><span id="line-80"> * <td>0x23</td></span> |
| <span class="source-line-no">081</span><span id="line-81"> * </tr></span> |
| <span class="source-line-no">082</span><span id="line-82"> * <tr></span> |
| <span class="source-line-no">083</span><span id="line-83"> * <td>NaN</td></span> |
| <span class="source-line-no">084</span><span id="line-84"> * <td>0x25</td></span> |
| <span class="source-line-no">085</span><span id="line-85"> * </tr></span> |
| <span class="source-line-no">086</span><span id="line-86"> * <tr></span> |
| <span class="source-line-no">087</span><span id="line-87"> * <td>fixed-length 32-bit integer</td></span> |
| <span class="source-line-no">088</span><span id="line-88"> * <td>0x27, I</td></span> |
| <span class="source-line-no">089</span><span id="line-89"> * </tr></span> |
| <span class="source-line-no">090</span><span id="line-90"> * <tr></span> |
| <span class="source-line-no">091</span><span id="line-91"> * <td>fixed-length 64-bit integer</td></span> |
| <span class="source-line-no">092</span><span id="line-92"> * <td>0x28, I</td></span> |
| <span class="source-line-no">093</span><span id="line-93"> * </tr></span> |
| <span class="source-line-no">094</span><span id="line-94"> * <tr></span> |
| <span class="source-line-no">095</span><span id="line-95"> * <td>fixed-length 8-bit integer</td></span> |
| <span class="source-line-no">096</span><span id="line-96"> * <td>0x29</td></span> |
| <span class="source-line-no">097</span><span id="line-97"> * </tr></span> |
| <span class="source-line-no">098</span><span id="line-98"> * <tr></span> |
| <span class="source-line-no">099</span><span id="line-99"> * <td>fixed-length 16-bit integer</td></span> |
| <span class="source-line-no">100</span><span id="line-100"> * <td>0x2a</td></span> |
| <span class="source-line-no">101</span><span id="line-101"> * </tr></span> |
| <span class="source-line-no">102</span><span id="line-102"> * <tr></span> |
| <span class="source-line-no">103</span><span id="line-103"> * <td>fixed-length 32-bit float</td></span> |
| <span class="source-line-no">104</span><span id="line-104"> * <td>0x30, F</td></span> |
| <span class="source-line-no">105</span><span id="line-105"> * </tr></span> |
| <span class="source-line-no">106</span><span id="line-106"> * <tr></span> |
| <span class="source-line-no">107</span><span id="line-107"> * <td>fixed-length 64-bit float</td></span> |
| <span class="source-line-no">108</span><span id="line-108"> * <td>0x31, F</td></span> |
| <span class="source-line-no">109</span><span id="line-109"> * </tr></span> |
| <span class="source-line-no">110</span><span id="line-110"> * <tr></span> |
| <span class="source-line-no">111</span><span id="line-111"> * <td>TEXT</td></span> |
| <span class="source-line-no">112</span><span id="line-112"> * <td>0x33, T</td></span> |
| <span class="source-line-no">113</span><span id="line-113"> * </tr></span> |
| <span class="source-line-no">114</span><span id="line-114"> * <tr></span> |
| <span class="source-line-no">115</span><span id="line-115"> * <td>variable length BLOB</td></span> |
| <span class="source-line-no">116</span><span id="line-116"> * <td>0x35, B</td></span> |
| <span class="source-line-no">117</span><span id="line-117"> * </tr></span> |
| <span class="source-line-no">118</span><span id="line-118"> * <tr></span> |
| <span class="source-line-no">119</span><span id="line-119"> * <td>byte-for-byte BLOB</td></span> |
| <span class="source-line-no">120</span><span id="line-120"> * <td>0x36, X</td></span> |
| <span class="source-line-no">121</span><span id="line-121"> * </tr></span> |
| <span class="source-line-no">122</span><span id="line-122"> * </table></span> |
| <span class="source-line-no">123</span><span id="line-123"> * <h3>Null Encoding</h3></span> |
| <span class="source-line-no">124</span><span id="line-124"> * <p></span> |
| <span class="source-line-no">125</span><span id="line-125"> * Each value that is a NULL encodes as a single byte of 0x05. Since every other value encoding</span> |
| <span class="source-line-no">126</span><span id="line-126"> * begins with a byte greater than 0x05, this forces NULL values to sort first.</span> |
| <span class="source-line-no">127</span><span id="line-127"> * </p></span> |
| <span class="source-line-no">128</span><span id="line-128"> * <h3>Text Encoding</h3></span> |
| <span class="source-line-no">129</span><span id="line-129"> * <p></span> |
| <span class="source-line-no">130</span><span id="line-130"> * Each text value begins with a single byte of 0x33 and ends with a single byte of 0x00. There are</span> |
| <span class="source-line-no">131</span><span id="line-131"> * zero or more intervening bytes that encode the text value. The intervening bytes are chosen so</span> |
| <span class="source-line-no">132</span><span id="line-132"> * that the encoding will sort in the desired collating order. The intervening bytes may not contain</span> |
| <span class="source-line-no">133</span><span id="line-133"> * a 0x00 character; the only 0x00 byte allowed in a text encoding is the final byte.</span> |
| <span class="source-line-no">134</span><span id="line-134"> * </p></span> |
| <span class="source-line-no">135</span><span id="line-135"> * <p></span> |
| <span class="source-line-no">136</span><span id="line-136"> * The text encoding ends in 0x00 in order to ensure that when there are two strings where one is a</span> |
| <span class="source-line-no">137</span><span id="line-137"> * prefix of the other that the shorter string will sort first.</span> |
| <span class="source-line-no">138</span><span id="line-138"> * </p></span> |
| <span class="source-line-no">139</span><span id="line-139"> * <h3>Binary Encoding</h3></span> |
| <span class="source-line-no">140</span><span id="line-140"> * <p></span> |
| <span class="source-line-no">141</span><span id="line-141"> * There are two encoding strategies for binary fields, referred to as "BlobVar" and "BlobCopy".</span> |
| <span class="source-line-no">142</span><span id="line-142"> * BlobVar is less efficient in both space and encoding time. It has no limitations on the range of</span> |
| <span class="source-line-no">143</span><span id="line-143"> * encoded values. BlobCopy is a byte-for-byte copy of the input data followed by a termination</span> |
| <span class="source-line-no">144</span><span id="line-144"> * byte. It is extremely fast to encode and decode. It carries the restriction of not allowing a</span> |
| <span class="source-line-no">145</span><span id="line-145"> * 0x00 value in the input byte[] as this value is used as the termination byte.</span> |
| <span class="source-line-no">146</span><span id="line-146"> * </p></span> |
| <span class="source-line-no">147</span><span id="line-147"> * <h4>BlobVar</h4></span> |
| <span class="source-line-no">148</span><span id="line-148"> * <p></span> |
| <span class="source-line-no">149</span><span id="line-149"> * "BlobVar" encodes the input byte[] in a manner similar to a variable length integer encoding. As</span> |
| <span class="source-line-no">150</span><span id="line-150"> * with the other {@code OrderedBytes} encodings, the first encoded byte is used to indicate what</span> |
| <span class="source-line-no">151</span><span id="line-151"> * kind of value follows. This header byte is 0x37 for BlobVar encoded values. As with the</span> |
| <span class="source-line-no">152</span><span id="line-152"> * traditional varint encoding, the most significant bit of each subsequent encoded {@code byte} is</span> |
| <span class="source-line-no">153</span><span id="line-153"> * used as a continuation marker. The 7 remaining bits contain the 7 most significant bits of the</span> |
| <span class="source-line-no">154</span><span id="line-154"> * first unencoded byte. The next encoded byte starts with a continuation marker in the MSB. The</span> |
| <span class="source-line-no">155</span><span id="line-155"> * least significant bit from the first unencoded byte follows, and the remaining 6 bits contain the</span> |
| <span class="source-line-no">156</span><span id="line-156"> * 6 MSBs of the second unencoded byte. The encoding continues, encoding 7 bytes on to 8 encoded</span> |
| <span class="source-line-no">157</span><span id="line-157"> * bytes. The MSB of the final encoded byte contains a termination marker rather than a continuation</span> |
| <span class="source-line-no">158</span><span id="line-158"> * marker, and any remaining bits from the final input byte. Any trailing bits in the final encoded</span> |
| <span class="source-line-no">159</span><span id="line-159"> * byte are zeros.</span> |
| <span class="source-line-no">160</span><span id="line-160"> * </p></span> |
| <span class="source-line-no">161</span><span id="line-161"> * <h4>BlobCopy</h4></span> |
| <span class="source-line-no">162</span><span id="line-162"> * <p></span> |
| <span class="source-line-no">163</span><span id="line-163"> * "BlobCopy" is a simple byte-for-byte copy of the input data. It uses 0x38 as the header byte, and</span> |
| <span class="source-line-no">164</span><span id="line-164"> * is terminated by 0x00 in the DESCENDING case. This alternative encoding is faster and more</span> |
| <span class="source-line-no">165</span><span id="line-165"> * space-efficient, but it cannot accept values containing a 0x00 byte in DESCENDING order.</span> |
| <span class="source-line-no">166</span><span id="line-166"> * </p></span> |
| <span class="source-line-no">167</span><span id="line-167"> * <h3>Variable-length Numeric Encoding</h3></span> |
| <span class="source-line-no">168</span><span id="line-168"> * <p></span> |
| <span class="source-line-no">169</span><span id="line-169"> * Numeric values must be coded so as to sort in numeric order. We assume that numeric values can be</span> |
| <span class="source-line-no">170</span><span id="line-170"> * both integer and floating point values. Clients must be careful to use inspection methods for</span> |
| <span class="source-line-no">171</span><span id="line-171"> * encoded values (such as {@link #isNumericInfinite(PositionedByteRange)} and</span> |
| <span class="source-line-no">172</span><span id="line-172"> * {@link #isNumericNaN(PositionedByteRange)} to protect against decoding values into object which</span> |
| <span class="source-line-no">173</span><span id="line-173"> * do not support these numeric concepts (such as {@link Long} and {@link BigDecimal}).</span> |
| <span class="source-line-no">174</span><span id="line-174"> * </p></span> |
| <span class="source-line-no">175</span><span id="line-175"> * <p></span> |
| <span class="source-line-no">176</span><span id="line-176"> * Simplest cases first: If the numeric value is a NaN, then the encoding is a single byte of 0x25.</span> |
| <span class="source-line-no">177</span><span id="line-177"> * This causes NaN values to sort after every other numeric value.</span> |
| <span class="source-line-no">178</span><span id="line-178"> * </p></span> |
| <span class="source-line-no">179</span><span id="line-179"> * <p></span> |
| <span class="source-line-no">180</span><span id="line-180"> * If the numeric value is a negative infinity then the encoding is a single byte of 0x07. Since</span> |
| <span class="source-line-no">181</span><span id="line-181"> * every other numeric value except NaN has a larger initial byte, this encoding ensures that</span> |
| <span class="source-line-no">182</span><span id="line-182"> * negative infinity will sort prior to every other numeric value other than NaN.</span> |
| <span class="source-line-no">183</span><span id="line-183"> * </p></span> |
| <span class="source-line-no">184</span><span id="line-184"> * <p></span> |
| <span class="source-line-no">185</span><span id="line-185"> * If the numeric value is a positive infinity then the encoding is a single byte of 0x23. Every</span> |
| <span class="source-line-no">186</span><span id="line-186"> * other numeric value encoding begins with a smaller byte, ensuring that positive infinity always</span> |
| <span class="source-line-no">187</span><span id="line-187"> * sorts last among numeric values. 0x23 is also smaller than 0x33, the initial byte of a text</span> |
| <span class="source-line-no">188</span><span id="line-188"> * value, ensuring that every numeric value sorts before every text value.</span> |
| <span class="source-line-no">189</span><span id="line-189"> * </p></span> |
| <span class="source-line-no">190</span><span id="line-190"> * <p></span> |
| <span class="source-line-no">191</span><span id="line-191"> * If the numeric value is exactly zero then it is encoded as a single byte of 0x15. Finite negative</span> |
| <span class="source-line-no">192</span><span id="line-192"> * values will have initial bytes of 0x08 through 0x14 and finite positive values will have initial</span> |
| <span class="source-line-no">193</span><span id="line-193"> * bytes of 0x16 through 0x22.</span> |
| <span class="source-line-no">194</span><span id="line-194"> * </p></span> |
| <span class="source-line-no">195</span><span id="line-195"> * <p></span> |
| <span class="source-line-no">196</span><span id="line-196"> * For all numeric values, we compute a mantissa M and an exponent E. The mantissa is a base-100</span> |
| <span class="source-line-no">197</span><span id="line-197"> * representation of the value. The exponent E determines where to put the decimal point.</span> |
| <span class="source-line-no">198</span><span id="line-198"> * </p></span> |
| <span class="source-line-no">199</span><span id="line-199"> * <p></span> |
| <span class="source-line-no">200</span><span id="line-200"> * Each centimal digit of the mantissa is stored in a byte. If the value of the centimal digit is X</span> |
| <span class="source-line-no">201</span><span id="line-201"> * (hence X&ge;0 and X&le;99) then the byte value will be 2*X+1 for every byte of the mantissa,</span> |
| <span class="source-line-no">202</span><span id="line-202"> * except for the last byte which will be 2*X+0. The mantissa must be the minimum number of bytes</span> |
| <span class="source-line-no">203</span><span id="line-203"> * necessary to represent the value; trailing X==0 digits are omitted. This means that the mantissa</span> |
| <span class="source-line-no">204</span><span id="line-204"> * will never contain a byte with the value 0x00.</span> |
| <span class="source-line-no">205</span><span id="line-205"> * </p></span> |
| <span class="source-line-no">206</span><span id="line-206"> * <p></span> |
| <span class="source-line-no">207</span><span id="line-207"> * If we assume all digits of the mantissa occur to the right of the decimal point, then the</span> |
| <span class="source-line-no">208</span><span id="line-208"> * exponent E is the power of one hundred by which one must multiply the mantissa to recover the</span> |
| <span class="source-line-no">209</span><span id="line-209"> * original value.</span> |
| <span class="source-line-no">210</span><span id="line-210"> * </p></span> |
| <span class="source-line-no">211</span><span id="line-211"> * <p></span> |
| <span class="source-line-no">212</span><span id="line-212"> * Values are classified as large, medium, or small according to the value of E. If E is 11 or more,</span> |
| <span class="source-line-no">213</span><span id="line-213"> * the value is large. For E between 0 and 10, the value is medium. For E less than zero, the value</span> |
| <span class="source-line-no">214</span><span id="line-214"> * is small.</span> |
| <span class="source-line-no">215</span><span id="line-215"> * </p></span> |
| <span class="source-line-no">216</span><span id="line-216"> * <p></span> |
| <span class="source-line-no">217</span><span id="line-217"> * Large positive values are encoded as a single byte 0x22 followed by E as a varint and then M.</span> |
| <span class="source-line-no">218</span><span id="line-218"> * Medium positive values are a single byte of 0x17+E followed by M. Small positive values are</span> |
| <span class="source-line-no">219</span><span id="line-219"> * encoded as a single byte 0x16 followed by the ones-complement of the varint for -E followed by M.</span> |
| <span class="source-line-no">220</span><span id="line-220"> * </p></span> |
| <span class="source-line-no">221</span><span id="line-221"> * <p></span> |
| <span class="source-line-no">222</span><span id="line-222"> * Small negative values are encoded as a single byte 0x14 followed by -E as a varint and then the</span> |
| <span class="source-line-no">223</span><span id="line-223"> * ones-complement of M. Medium negative values are encoded as a byte 0x13-E followed by the</span> |
| <span class="source-line-no">224</span><span id="line-224"> * ones-complement of M. Large negative values consist of the single byte 0x08 followed by the</span> |
| <span class="source-line-no">225</span><span id="line-225"> * ones-complement of the varint encoding of E followed by the ones-complement of M.</span> |
| <span class="source-line-no">226</span><span id="line-226"> * </p></span> |
| <span class="source-line-no">227</span><span id="line-227"> * <h3>Fixed-length Integer Encoding</h3></span> |
| <span class="source-line-no">228</span><span id="line-228"> * <p></span> |
| <span class="source-line-no">229</span><span id="line-229"> * All 4-byte integers are serialized to a 5-byte, fixed-width, sortable byte format. All 8-byte</span> |
| <span class="source-line-no">230</span><span id="line-230"> * integers are serialized to the equivelant 9-byte format. Serialization is performed by writing a</span> |
| <span class="source-line-no">231</span><span id="line-231"> * header byte, inverting the integer sign bit and writing the resulting bytes to the byte array in</span> |
| <span class="source-line-no">232</span><span id="line-232"> * big endian order.</span> |
| <span class="source-line-no">233</span><span id="line-233"> * </p></span> |
| <span class="source-line-no">234</span><span id="line-234"> * <h3>Fixed-length Floating Point Encoding</h3></span> |
| <span class="source-line-no">235</span><span id="line-235"> * <p></span> |
| <span class="source-line-no">236</span><span id="line-236"> * 32-bit and 64-bit floating point numbers are encoded to a 5-byte and 9-byte encoding format,</span> |
| <span class="source-line-no">237</span><span id="line-237"> * respectively. The format is identical, save for the precision respected in each step of the</span> |
| <span class="source-line-no">238</span><span id="line-238"> * operation.</span> |
| <span class="source-line-no">239</span><span id="line-239"> * <p></span> |
| <span class="source-line-no">240</span><span id="line-240"> * This format ensures the following total ordering of floating point values:</span> |
| <span class="source-line-no">241</span><span id="line-241"> * Float.NEGATIVE_INFINITY &lt; -Float.MAX_VALUE &lt; ... &lt; -Float.MIN_VALUE &lt; -0.0 &lt; +0.0;</span> |
| <span class="source-line-no">242</span><span id="line-242"> * &lt; Float.MIN_VALUE &lt; ... &lt; Float.MAX_VALUE &lt; Float.POSITIVE_INFINITY &lt; Float.NaN</span> |
| <span class="source-line-no">243</span><span id="line-243"> * </p></span> |
| <span class="source-line-no">244</span><span id="line-244"> * <p></span> |
| <span class="source-line-no">245</span><span id="line-245"> * Floating point numbers are encoded as specified in IEEE 754. A 32-bit single precision float</span> |
| <span class="source-line-no">246</span><span id="line-246"> * consists of a sign bit, 8-bit unsigned exponent encoded in offset-127 notation, and a 23-bit</span> |
| <span class="source-line-no">247</span><span id="line-247"> * significand. The format is described further in the</span> |
| <span class="source-line-no">248</span><span id="line-248"> * <a href="http://en.wikipedia.org/wiki/Single_precision"> Single Precision Floating Point</span> |
| <span class="source-line-no">249</span><span id="line-249"> * Wikipedia page</a></span> |
| <span class="source-line-no">250</span><span id="line-250"> * </p></span> |
| <span class="source-line-no">251</span><span id="line-251"> * <p></span> |
| <span class="source-line-no">252</span><span id="line-252"> * The value of a normal float is -1 <sup>sign bit</sup> &times; 2<sup>exponent - 127</sup> &times;</span> |
| <span class="source-line-no">253</span><span id="line-253"> * 1.significand</span> |
| <span class="source-line-no">254</span><span id="line-254"> * </p></span> |
| <span class="source-line-no">255</span><span id="line-255"> * <p></span> |
| <span class="source-line-no">256</span><span id="line-256"> * The IEE754 floating point format already preserves sort ordering for positive floating point</span> |
| <span class="source-line-no">257</span><span id="line-257"> * numbers when the raw bytes are compared in most significant byte order. This is discussed further</span> |
| <span class="source-line-no">258</span><span id="line-258"> * at <a href= "http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm"></span> |
| <span class="source-line-no">259</span><span id="line-259"> * http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm</a></span> |
| <span class="source-line-no">260</span><span id="line-260"> * </p></span> |
| <span class="source-line-no">261</span><span id="line-261"> * <p></span> |
| <span class="source-line-no">262</span><span id="line-262"> * Thus, we need only ensure that negative numbers sort in the the exact opposite order as positive</span> |
| <span class="source-line-no">263</span><span id="line-263"> * numbers (so that say, negative infinity is less than negative 1), and that all negative numbers</span> |
| <span class="source-line-no">264</span><span id="line-264"> * compare less than any positive number. To accomplish this, we invert the sign bit of all floating</span> |
| <span class="source-line-no">265</span><span id="line-265"> * point numbers, and we also invert the exponent and significand bits if the floating point number</span> |
| <span class="source-line-no">266</span><span id="line-266"> * was negative.</span> |
| <span class="source-line-no">267</span><span id="line-267"> * </p></span> |
| <span class="source-line-no">268</span><span id="line-268"> * <p></span> |
| <span class="source-line-no">269</span><span id="line-269"> * More specifically, we first store the floating point bits into a 32-bit int {@code j} using</span> |
| <span class="source-line-no">270</span><span id="line-270"> * {@link Float#floatToIntBits}. This method collapses all NaNs into a single, canonical NaN value</span> |
| <span class="source-line-no">271</span><span id="line-271"> * but otherwise leaves the bits unchanged. We then compute</span> |
| <span class="source-line-no">272</span><span id="line-272"> * </p></span> |
| <span class="source-line-no">273</span><span id="line-273"> *</span> |
| <span class="source-line-no">274</span><span id="line-274"> * <pre></span> |
| <span class="source-line-no">275</span><span id="line-275"> * j &circ;= (j &gt;&gt; (Integer.SIZE - 1)) | Integer.MIN_SIZE</span> |
| <span class="source-line-no">276</span><span id="line-276"> * </pre></span> |
| <span class="source-line-no">277</span><span id="line-277"> * <p></span> |
| <span class="source-line-no">278</span><span id="line-278"> * which inverts the sign bit and XOR's all other bits with the sign bit itself. Comparing the raw</span> |
| <span class="source-line-no">279</span><span id="line-279"> * bytes of {@code j} in most significant byte order is equivalent to performing a single precision</span> |
| <span class="source-line-no">280</span><span id="line-280"> * floating point comparison on the underlying bits (ignoring NaN comparisons, as NaNs don't compare</span> |
| <span class="source-line-no">281</span><span id="line-281"> * equal to anything when performing floating point comparisons).</span> |
| <span class="source-line-no">282</span><span id="line-282"> * </p></span> |
| <span class="source-line-no">283</span><span id="line-283"> * <p></span> |
| <span class="source-line-no">284</span><span id="line-284"> * The resulting integer is then converted into a byte array by serializing the integer one byte at</span> |
| <span class="source-line-no">285</span><span id="line-285"> * a time in most significant byte order. The serialized integer is prefixed by a single header</span> |
| <span class="source-line-no">286</span><span id="line-286"> * byte. All serialized values are 5 bytes in length.</span> |
| <span class="source-line-no">287</span><span id="line-287"> * </p></span> |
| <span class="source-line-no">288</span><span id="line-288"> * <p></span> |
| <span class="source-line-no">289</span><span id="line-289"> * {@code OrderedBytes} encodings are heavily influenced by the</span> |
| <span class="source-line-no">290</span><span id="line-290"> * <a href="http://sqlite.org/src4/doc/trunk/www/key_encoding.wiki">SQLite4 Key Encoding</a>. Slight</span> |
| <span class="source-line-no">291</span><span id="line-291"> * deviations are make in the interest of order correctness and user extensibility. Fixed-width</span> |
| <span class="source-line-no">292</span><span id="line-292"> * {@code Long} and {@link Double} encodings are based on implementations from the now defunct</span> |
| <span class="source-line-no">293</span><span id="line-293"> * Orderly library.</span> |
| <span class="source-line-no">294</span><span id="line-294"> * </p></span> |
| <span class="source-line-no">295</span><span id="line-295"> */</span> |
| <span class="source-line-no">296</span><span id="line-296">@InterfaceAudience.Public</span> |
| <span class="source-line-no">297</span><span id="line-297">public class OrderedBytes {</span> |
| <span class="source-line-no">298</span><span id="line-298"></span> |
| <span class="source-line-no">299</span><span id="line-299"> /*</span> |
| <span class="source-line-no">300</span><span id="line-300"> * These constants define header bytes used to identify encoded values. Note that the values here</span> |
| <span class="source-line-no">301</span><span id="line-301"> * are not exhaustive as the Numeric format encodes portions of its value within the header byte.</span> |
| <span class="source-line-no">302</span><span id="line-302"> * The values listed here are directly applied to persisted data -- DO NOT modify the values</span> |
| <span class="source-line-no">303</span><span id="line-303"> * specified here. Instead, gaps are placed intentionally between values so that new</span> |
| <span class="source-line-no">304</span><span id="line-304"> * implementations can be inserted into the total ordering enforced here.</span> |
| <span class="source-line-no">305</span><span id="line-305"> */</span> |
| <span class="source-line-no">306</span><span id="line-306"> private static final byte NULL = 0x05;</span> |
| <span class="source-line-no">307</span><span id="line-307"> // room for 1 expansion type</span> |
| <span class="source-line-no">308</span><span id="line-308"> private static final byte NEG_INF = 0x07;</span> |
| <span class="source-line-no">309</span><span id="line-309"> private static final byte NEG_LARGE = 0x08;</span> |
| <span class="source-line-no">310</span><span id="line-310"> private static final byte NEG_MED_MIN = 0x09;</span> |
| <span class="source-line-no">311</span><span id="line-311"> private static final byte NEG_MED_MAX = 0x13;</span> |
| <span class="source-line-no">312</span><span id="line-312"> private static final byte NEG_SMALL = 0x14;</span> |
| <span class="source-line-no">313</span><span id="line-313"> private static final byte ZERO = 0x15;</span> |
| <span class="source-line-no">314</span><span id="line-314"> private static final byte POS_SMALL = 0x16;</span> |
| <span class="source-line-no">315</span><span id="line-315"> private static final byte POS_MED_MIN = 0x17;</span> |
| <span class="source-line-no">316</span><span id="line-316"> private static final byte POS_MED_MAX = 0x21;</span> |
| <span class="source-line-no">317</span><span id="line-317"> private static final byte POS_LARGE = 0x22;</span> |
| <span class="source-line-no">318</span><span id="line-318"> private static final byte POS_INF = 0x23;</span> |
| <span class="source-line-no">319</span><span id="line-319"> // room for 2 expansion type</span> |
| <span class="source-line-no">320</span><span id="line-320"> private static final byte NAN = 0x26;</span> |
| <span class="source-line-no">321</span><span id="line-321"> // room for 2 expansion types</span> |
| <span class="source-line-no">322</span><span id="line-322"> private static final byte FIXED_INT8 = 0x29;</span> |
| <span class="source-line-no">323</span><span id="line-323"> private static final byte FIXED_INT16 = 0x2a;</span> |
| <span class="source-line-no">324</span><span id="line-324"> private static final byte FIXED_INT32 = 0x2b;</span> |
| <span class="source-line-no">325</span><span id="line-325"> private static final byte FIXED_INT64 = 0x2c;</span> |
| <span class="source-line-no">326</span><span id="line-326"> // room for 3 expansion types</span> |
| <span class="source-line-no">327</span><span id="line-327"> private static final byte FIXED_FLOAT32 = 0x30;</span> |
| <span class="source-line-no">328</span><span id="line-328"> private static final byte FIXED_FLOAT64 = 0x31;</span> |
| <span class="source-line-no">329</span><span id="line-329"> // room for 2 expansion type</span> |
| <span class="source-line-no">330</span><span id="line-330"> private static final byte TEXT = 0x34;</span> |
| <span class="source-line-no">331</span><span id="line-331"> // room for 2 expansion type</span> |
| <span class="source-line-no">332</span><span id="line-332"> private static final byte BLOB_VAR = 0x37;</span> |
| <span class="source-line-no">333</span><span id="line-333"> private static final byte BLOB_COPY = 0x38;</span> |
| <span class="source-line-no">334</span><span id="line-334"></span> |
| <span class="source-line-no">335</span><span id="line-335"> /*</span> |
| <span class="source-line-no">336</span><span id="line-336"> * The following constant values are used by encoding implementations</span> |
| <span class="source-line-no">337</span><span id="line-337"> */</span> |
| <span class="source-line-no">338</span><span id="line-338"></span> |
| <span class="source-line-no">339</span><span id="line-339"> public static final Charset UTF8 = Charset.forName("UTF-8");</span> |
| <span class="source-line-no">340</span><span id="line-340"> private static final byte TERM = 0x00;</span> |
| <span class="source-line-no">341</span><span id="line-341"></span> |
| <span class="source-line-no">342</span><span id="line-342"> /**</span> |
| <span class="source-line-no">343</span><span id="line-343"> * Max precision guaranteed to fit into a {@code long}.</span> |
| <span class="source-line-no">344</span><span id="line-344"> */</span> |
| <span class="source-line-no">345</span><span id="line-345"> public static final int MAX_PRECISION = 31;</span> |
| <span class="source-line-no">346</span><span id="line-346"></span> |
| <span class="source-line-no">347</span><span id="line-347"> /**</span> |
| <span class="source-line-no">348</span><span id="line-348"> * The context used to normalize {@link BigDecimal} values.</span> |
| <span class="source-line-no">349</span><span id="line-349"> */</span> |
| <span class="source-line-no">350</span><span id="line-350"> public static final MathContext DEFAULT_MATH_CONTEXT =</span> |
| <span class="source-line-no">351</span><span id="line-351"> new MathContext(MAX_PRECISION, RoundingMode.HALF_UP);</span> |
| <span class="source-line-no">352</span><span id="line-352"></span> |
| <span class="source-line-no">353</span><span id="line-353"> /**</span> |
| <span class="source-line-no">354</span><span id="line-354"> * Creates the standard exception when the encoded header byte is unexpected for the decoding</span> |
| <span class="source-line-no">355</span><span id="line-355"> * context.</span> |
| <span class="source-line-no">356</span><span id="line-356"> * @param header value used in error message.</span> |
| <span class="source-line-no">357</span><span id="line-357"> */</span> |
| <span class="source-line-no">358</span><span id="line-358"> private static IllegalArgumentException unexpectedHeader(byte header) {</span> |
| <span class="source-line-no">359</span><span id="line-359"> throw new IllegalArgumentException(</span> |
| <span class="source-line-no">360</span><span id="line-360"> "unexpected value in first byte: 0x" + Long.toHexString(header));</span> |
| <span class="source-line-no">361</span><span id="line-361"> }</span> |
| <span class="source-line-no">362</span><span id="line-362"></span> |
| <span class="source-line-no">363</span><span id="line-363"> /**</span> |
| <span class="source-line-no">364</span><span id="line-364"> * Perform unsigned comparison between two long values. Conforms to the same interface as</span> |
| <span class="source-line-no">365</span><span id="line-365"> * {@link org.apache.hadoop.hbase.CellComparator}.</span> |
| <span class="source-line-no">366</span><span id="line-366"> */</span> |
| <span class="source-line-no">367</span><span id="line-367"> private static int unsignedCmp(long x1, long x2) {</span> |
| <span class="source-line-no">368</span><span id="line-368"> int cmp;</span> |
| <span class="source-line-no">369</span><span id="line-369"> if ((cmp = (x1 < x2 ? -1 : (x1 == x2 ? 0 : 1))) == 0) return 0;</span> |
| <span class="source-line-no">370</span><span id="line-370"> // invert the result when either value is negative</span> |
| <span class="source-line-no">371</span><span id="line-371"> if ((x1 < 0) != (x2 < 0)) return -cmp;</span> |
| <span class="source-line-no">372</span><span id="line-372"> return cmp;</span> |
| <span class="source-line-no">373</span><span id="line-373"> }</span> |
| <span class="source-line-no">374</span><span id="line-374"></span> |
| <span class="source-line-no">375</span><span id="line-375"> /**</span> |
| <span class="source-line-no">376</span><span id="line-376"> * Write a 32-bit unsigned integer to {@code dst} as 4 big-endian bytes.</span> |
| <span class="source-line-no">377</span><span id="line-377"> * @return number of bytes written.</span> |
| <span class="source-line-no">378</span><span id="line-378"> */</span> |
| <span class="source-line-no">379</span><span id="line-379"> private static int putUint32(PositionedByteRange dst, int val) {</span> |
| <span class="source-line-no">380</span><span id="line-380"> dst.put((byte) (val >>> 24)).put((byte) (val >>> 16)).put((byte) (val >>> 8)).put((byte) val);</span> |
| <span class="source-line-no">381</span><span id="line-381"> return 4;</span> |
| <span class="source-line-no">382</span><span id="line-382"> }</span> |
| <span class="source-line-no">383</span><span id="line-383"></span> |
| <span class="source-line-no">384</span><span id="line-384"> /**</span> |
| <span class="source-line-no">385</span><span id="line-385"> * Encode an unsigned 64-bit unsigned integer {@code val} into {@code dst}.</span> |
| <span class="source-line-no">386</span><span id="line-386"> * @param dst The destination to which encoded bytes are written.</span> |
| <span class="source-line-no">387</span><span id="line-387"> * @param val The value to write.</span> |
| <span class="source-line-no">388</span><span id="line-388"> * @param comp Compliment the encoded value when {@code comp} is true.</span> |
| <span class="source-line-no">389</span><span id="line-389"> * @return number of bytes written.</span> |
| <span class="source-line-no">390</span><span id="line-390"> */</span> |
| <span class="source-line-no">391</span><span id="line-391"> static int putVaruint64(PositionedByteRange dst, long val, boolean comp) {</span> |
| <span class="source-line-no">392</span><span id="line-392"> int w, y, len = 0;</span> |
| <span class="source-line-no">393</span><span id="line-393"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">394</span><span id="line-394"> byte[] a = dst.getBytes();</span> |
| <span class="source-line-no">395</span><span id="line-395"> Order ord = comp ? DESCENDING : ASCENDING;</span> |
| <span class="source-line-no">396</span><span id="line-396"> if (-1 == unsignedCmp(val, 241L)) {</span> |
| <span class="source-line-no">397</span><span id="line-397"> dst.put((byte) val);</span> |
| <span class="source-line-no">398</span><span id="line-398"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">399</span><span id="line-399"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">400</span><span id="line-400"> return len;</span> |
| <span class="source-line-no">401</span><span id="line-401"> }</span> |
| <span class="source-line-no">402</span><span id="line-402"> if (-1 == unsignedCmp(val, 2288L)) {</span> |
| <span class="source-line-no">403</span><span id="line-403"> y = (int) (val - 240);</span> |
| <span class="source-line-no">404</span><span id="line-404"> dst.put((byte) (y / 256 + 241)).put((byte) (y % 256));</span> |
| <span class="source-line-no">405</span><span id="line-405"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">406</span><span id="line-406"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">407</span><span id="line-407"> return len;</span> |
| <span class="source-line-no">408</span><span id="line-408"> }</span> |
| <span class="source-line-no">409</span><span id="line-409"> if (-1 == unsignedCmp(val, 67824L)) {</span> |
| <span class="source-line-no">410</span><span id="line-410"> y = (int) (val - 2288);</span> |
| <span class="source-line-no">411</span><span id="line-411"> dst.put((byte) 249).put((byte) (y / 256)).put((byte) (y % 256));</span> |
| <span class="source-line-no">412</span><span id="line-412"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">413</span><span id="line-413"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">414</span><span id="line-414"> return len;</span> |
| <span class="source-line-no">415</span><span id="line-415"> }</span> |
| <span class="source-line-no">416</span><span id="line-416"> y = (int) val;</span> |
| <span class="source-line-no">417</span><span id="line-417"> w = (int) (val >>> 32);</span> |
| <span class="source-line-no">418</span><span id="line-418"> if (w == 0) {</span> |
| <span class="source-line-no">419</span><span id="line-419"> if (-1 == unsignedCmp(y, 16777216L)) {</span> |
| <span class="source-line-no">420</span><span id="line-420"> dst.put((byte) 250).put((byte) (y >>> 16)).put((byte) (y >>> 8)).put((byte) y);</span> |
| <span class="source-line-no">421</span><span id="line-421"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">422</span><span id="line-422"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">423</span><span id="line-423"> return len;</span> |
| <span class="source-line-no">424</span><span id="line-424"> }</span> |
| <span class="source-line-no">425</span><span id="line-425"> dst.put((byte) 251);</span> |
| <span class="source-line-no">426</span><span id="line-426"> putUint32(dst, y);</span> |
| <span class="source-line-no">427</span><span id="line-427"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">428</span><span id="line-428"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">429</span><span id="line-429"> return len;</span> |
| <span class="source-line-no">430</span><span id="line-430"> }</span> |
| <span class="source-line-no">431</span><span id="line-431"> if (-1 == unsignedCmp(w, 256L)) {</span> |
| <span class="source-line-no">432</span><span id="line-432"> dst.put((byte) 252).put((byte) w);</span> |
| <span class="source-line-no">433</span><span id="line-433"> putUint32(dst, y);</span> |
| <span class="source-line-no">434</span><span id="line-434"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">435</span><span id="line-435"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">436</span><span id="line-436"> return len;</span> |
| <span class="source-line-no">437</span><span id="line-437"> }</span> |
| <span class="source-line-no">438</span><span id="line-438"> if (-1 == unsignedCmp(w, 65536L)) {</span> |
| <span class="source-line-no">439</span><span id="line-439"> dst.put((byte) 253).put((byte) (w >>> 8)).put((byte) w);</span> |
| <span class="source-line-no">440</span><span id="line-440"> putUint32(dst, y);</span> |
| <span class="source-line-no">441</span><span id="line-441"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">442</span><span id="line-442"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">443</span><span id="line-443"> return len;</span> |
| <span class="source-line-no">444</span><span id="line-444"> }</span> |
| <span class="source-line-no">445</span><span id="line-445"> if (-1 == unsignedCmp(w, 16777216L)) {</span> |
| <span class="source-line-no">446</span><span id="line-446"> dst.put((byte) 254).put((byte) (w >>> 16)).put((byte) (w >>> 8)).put((byte) w);</span> |
| <span class="source-line-no">447</span><span id="line-447"> putUint32(dst, y);</span> |
| <span class="source-line-no">448</span><span id="line-448"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">449</span><span id="line-449"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">450</span><span id="line-450"> return len;</span> |
| <span class="source-line-no">451</span><span id="line-451"> }</span> |
| <span class="source-line-no">452</span><span id="line-452"> dst.put((byte) 255);</span> |
| <span class="source-line-no">453</span><span id="line-453"> putUint32(dst, w);</span> |
| <span class="source-line-no">454</span><span id="line-454"> putUint32(dst, y);</span> |
| <span class="source-line-no">455</span><span id="line-455"> len = dst.getPosition() - start;</span> |
| <span class="source-line-no">456</span><span id="line-456"> ord.apply(a, offset + start, len);</span> |
| <span class="source-line-no">457</span><span id="line-457"> return len;</span> |
| <span class="source-line-no">458</span><span id="line-458"> }</span> |
| <span class="source-line-no">459</span><span id="line-459"></span> |
| <span class="source-line-no">460</span><span id="line-460"> /**</span> |
| <span class="source-line-no">461</span><span id="line-461"> * Inspect {@code src} for an encoded varuint64 for its length in bytes. Preserves the state of</span> |
| <span class="source-line-no">462</span><span id="line-462"> * {@code src}.</span> |
| <span class="source-line-no">463</span><span id="line-463"> * @param src source buffer</span> |
| <span class="source-line-no">464</span><span id="line-464"> * @param comp if true, parse the compliment of the value.</span> |
| <span class="source-line-no">465</span><span id="line-465"> * @return the number of bytes consumed by this value.</span> |
| <span class="source-line-no">466</span><span id="line-466"> */</span> |
| <span class="source-line-no">467</span><span id="line-467"> static int lengthVaruint64(PositionedByteRange src, boolean comp) {</span> |
| <span class="source-line-no">468</span><span id="line-468"> int a0 = (comp ? DESCENDING : ASCENDING).apply(src.peek()) & 0xff;</span> |
| <span class="source-line-no">469</span><span id="line-469"> if (a0 <= 240) return 1;</span> |
| <span class="source-line-no">470</span><span id="line-470"> if (a0 <= 248) return 2;</span> |
| <span class="source-line-no">471</span><span id="line-471"> if (a0 == 249) return 3;</span> |
| <span class="source-line-no">472</span><span id="line-472"> if (a0 == 250) return 4;</span> |
| <span class="source-line-no">473</span><span id="line-473"> if (a0 == 251) return 5;</span> |
| <span class="source-line-no">474</span><span id="line-474"> if (a0 == 252) return 6;</span> |
| <span class="source-line-no">475</span><span id="line-475"> if (a0 == 253) return 7;</span> |
| <span class="source-line-no">476</span><span id="line-476"> if (a0 == 254) return 8;</span> |
| <span class="source-line-no">477</span><span id="line-477"> if (a0 == 255) return 9;</span> |
| <span class="source-line-no">478</span><span id="line-478"> throw unexpectedHeader(src.peek());</span> |
| <span class="source-line-no">479</span><span id="line-479"> }</span> |
| <span class="source-line-no">480</span><span id="line-480"></span> |
| <span class="source-line-no">481</span><span id="line-481"> /**</span> |
| <span class="source-line-no">482</span><span id="line-482"> * Skip {@code src} over the encoded varuint64.</span> |
| <span class="source-line-no">483</span><span id="line-483"> * @param src source buffer</span> |
| <span class="source-line-no">484</span><span id="line-484"> * @param cmp if true, parse the compliment of the value.</span> |
| <span class="source-line-no">485</span><span id="line-485"> * @return the number of bytes skipped.</span> |
| <span class="source-line-no">486</span><span id="line-486"> */</span> |
| <span class="source-line-no">487</span><span id="line-487"> static int skipVaruint64(PositionedByteRange src, boolean cmp) {</span> |
| <span class="source-line-no">488</span><span id="line-488"> final int len = lengthVaruint64(src, cmp);</span> |
| <span class="source-line-no">489</span><span id="line-489"> src.setPosition(src.getPosition() + len);</span> |
| <span class="source-line-no">490</span><span id="line-490"> return len;</span> |
| <span class="source-line-no">491</span><span id="line-491"> }</span> |
| <span class="source-line-no">492</span><span id="line-492"></span> |
| <span class="source-line-no">493</span><span id="line-493"> /**</span> |
| <span class="source-line-no">494</span><span id="line-494"> * Decode a sequence of bytes in {@code src} as a varuint64. Compliment the encoded value when</span> |
| <span class="source-line-no">495</span><span id="line-495"> * {@code comp} is true.</span> |
| <span class="source-line-no">496</span><span id="line-496"> * @return the decoded value.</span> |
| <span class="source-line-no">497</span><span id="line-497"> */</span> |
| <span class="source-line-no">498</span><span id="line-498"> static long getVaruint64(PositionedByteRange src, boolean comp) {</span> |
| <span class="source-line-no">499</span><span id="line-499"> assert src.getRemaining() >= lengthVaruint64(src, comp);</span> |
| <span class="source-line-no">500</span><span id="line-500"> final long ret;</span> |
| <span class="source-line-no">501</span><span id="line-501"> Order ord = comp ? DESCENDING : ASCENDING;</span> |
| <span class="source-line-no">502</span><span id="line-502"> byte x = src.get();</span> |
| <span class="source-line-no">503</span><span id="line-503"> final int a0 = ord.apply(x) & 0xff, a1, a2, a3, a4, a5, a6, a7, a8;</span> |
| <span class="source-line-no">504</span><span id="line-504"> if (-1 == unsignedCmp(a0, 241)) {</span> |
| <span class="source-line-no">505</span><span id="line-505"> return a0;</span> |
| <span class="source-line-no">506</span><span id="line-506"> }</span> |
| <span class="source-line-no">507</span><span id="line-507"> x = src.get();</span> |
| <span class="source-line-no">508</span><span id="line-508"> a1 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">509</span><span id="line-509"> if (-1 == unsignedCmp(a0, 249)) {</span> |
| <span class="source-line-no">510</span><span id="line-510"> return (a0 - 241L) * 256 + a1 + 240;</span> |
| <span class="source-line-no">511</span><span id="line-511"> }</span> |
| <span class="source-line-no">512</span><span id="line-512"> x = src.get();</span> |
| <span class="source-line-no">513</span><span id="line-513"> a2 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">514</span><span id="line-514"> if (a0 == 249) {</span> |
| <span class="source-line-no">515</span><span id="line-515"> return 2288L + 256 * a1 + a2;</span> |
| <span class="source-line-no">516</span><span id="line-516"> }</span> |
| <span class="source-line-no">517</span><span id="line-517"> x = src.get();</span> |
| <span class="source-line-no">518</span><span id="line-518"> a3 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">519</span><span id="line-519"> if (a0 == 250) {</span> |
| <span class="source-line-no">520</span><span id="line-520"> return ((long) a1 << 16L) | (a2 << 8) | a3;</span> |
| <span class="source-line-no">521</span><span id="line-521"> }</span> |
| <span class="source-line-no">522</span><span id="line-522"> x = src.get();</span> |
| <span class="source-line-no">523</span><span id="line-523"> a4 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">524</span><span id="line-524"> ret = (((long) a1) << 24) | (a2 << 16) | (a3 << 8) | a4;</span> |
| <span class="source-line-no">525</span><span id="line-525"> if (a0 == 251) {</span> |
| <span class="source-line-no">526</span><span id="line-526"> return ret;</span> |
| <span class="source-line-no">527</span><span id="line-527"> }</span> |
| <span class="source-line-no">528</span><span id="line-528"> x = src.get();</span> |
| <span class="source-line-no">529</span><span id="line-529"> a5 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">530</span><span id="line-530"> if (a0 == 252) {</span> |
| <span class="source-line-no">531</span><span id="line-531"> return (ret << 8) | a5;</span> |
| <span class="source-line-no">532</span><span id="line-532"> }</span> |
| <span class="source-line-no">533</span><span id="line-533"> x = src.get();</span> |
| <span class="source-line-no">534</span><span id="line-534"> a6 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">535</span><span id="line-535"> if (a0 == 253) {</span> |
| <span class="source-line-no">536</span><span id="line-536"> return (ret << 16) | (a5 << 8) | a6;</span> |
| <span class="source-line-no">537</span><span id="line-537"> }</span> |
| <span class="source-line-no">538</span><span id="line-538"> x = src.get();</span> |
| <span class="source-line-no">539</span><span id="line-539"> a7 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">540</span><span id="line-540"> if (a0 == 254) {</span> |
| <span class="source-line-no">541</span><span id="line-541"> return (ret << 24) | (a5 << 16) | (a6 << 8) | a7;</span> |
| <span class="source-line-no">542</span><span id="line-542"> }</span> |
| <span class="source-line-no">543</span><span id="line-543"> x = src.get();</span> |
| <span class="source-line-no">544</span><span id="line-544"> a8 = ord.apply(x) & 0xff;</span> |
| <span class="source-line-no">545</span><span id="line-545"> return (ret << 32) | (((long) a5) << 24) | (a6 << 16) | (a7 << 8) | a8;</span> |
| <span class="source-line-no">546</span><span id="line-546"> }</span> |
| <span class="source-line-no">547</span><span id="line-547"></span> |
| <span class="source-line-no">548</span><span id="line-548"> /**</span> |
| <span class="source-line-no">549</span><span id="line-549"> * Strip all trailing zeros to ensure that no digit will be zero and round using our default</span> |
| <span class="source-line-no">550</span><span id="line-550"> * context to ensure precision doesn't exceed max allowed. From Phoenix's {@code NumberUtil}.</span> |
| <span class="source-line-no">551</span><span id="line-551"> * @return new {@link BigDecimal} instance</span> |
| <span class="source-line-no">552</span><span id="line-552"> */</span> |
| <span class="source-line-no">553</span><span id="line-553"> static BigDecimal normalize(BigDecimal val) {</span> |
| <span class="source-line-no">554</span><span id="line-554"> return null == val ? null : val.stripTrailingZeros().round(DEFAULT_MATH_CONTEXT);</span> |
| <span class="source-line-no">555</span><span id="line-555"> }</span> |
| <span class="source-line-no">556</span><span id="line-556"></span> |
| <span class="source-line-no">557</span><span id="line-557"> /**</span> |
| <span class="source-line-no">558</span><span id="line-558"> * Read significand digits from {@code src} according to the magnitude of {@code e}.</span> |
| <span class="source-line-no">559</span><span id="line-559"> * @param src The source from which to read encoded digits.</span> |
| <span class="source-line-no">560</span><span id="line-560"> * @param e The magnitude of the first digit read.</span> |
| <span class="source-line-no">561</span><span id="line-561"> * @param comp Treat encoded bytes as compliments when {@code comp} is true.</span> |
| <span class="source-line-no">562</span><span id="line-562"> * @return The decoded value.</span> |
| <span class="source-line-no">563</span><span id="line-563"> * @throws IllegalArgumentException when read exceeds the remaining length of {@code src}.</span> |
| <span class="source-line-no">564</span><span id="line-564"> */</span> |
| <span class="source-line-no">565</span><span id="line-565"> private static BigDecimal decodeSignificand(PositionedByteRange src, int e, boolean comp) {</span> |
| <span class="source-line-no">566</span><span id="line-566"> // TODO: can this be made faster?</span> |
| <span class="source-line-no">567</span><span id="line-567"> byte[] a = src.getBytes();</span> |
| <span class="source-line-no">568</span><span id="line-568"> final int start = src.getPosition(), offset = src.getOffset(), remaining = src.getRemaining();</span> |
| <span class="source-line-no">569</span><span id="line-569"> Order ord = comp ? DESCENDING : ASCENDING;</span> |
| <span class="source-line-no">570</span><span id="line-570"> BigDecimal m;</span> |
| <span class="source-line-no">571</span><span id="line-571"> StringBuilder sb = new StringBuilder();</span> |
| <span class="source-line-no">572</span><span id="line-572"> for (int i = 0;; i++) {</span> |
| <span class="source-line-no">573</span><span id="line-573"> if (i > remaining) {</span> |
| <span class="source-line-no">574</span><span id="line-574"> // we've exceeded this range's window</span> |
| <span class="source-line-no">575</span><span id="line-575"> src.setPosition(start);</span> |
| <span class="source-line-no">576</span><span id="line-576"> throw new IllegalArgumentException(</span> |
| <span class="source-line-no">577</span><span id="line-577"> "Read exceeds range before termination byte found. offset: " + offset + " position: "</span> |
| <span class="source-line-no">578</span><span id="line-578"> + (start + i));</span> |
| <span class="source-line-no">579</span><span id="line-579"> }</span> |
| <span class="source-line-no">580</span><span id="line-580"> // one byte -> 2 digits</span> |
| <span class="source-line-no">581</span><span id="line-581"> // base-100 digits are encoded as val * 2 + 1 except for the termination digit.</span> |
| <span class="source-line-no">582</span><span id="line-582"> int twoDigits = (ord.apply(a[offset + start + i]) & 0xff) / 2;</span> |
| <span class="source-line-no">583</span><span id="line-583"> sb.append(String.format("%02d", twoDigits));</span> |
| <span class="source-line-no">584</span><span id="line-584"> // detect termination digit</span> |
| <span class="source-line-no">585</span><span id="line-585"> // Besides, as we will normalise the return value at last,</span> |
| <span class="source-line-no">586</span><span id="line-586"> // we only need to decode at most MAX_PRECISION + 2 digits here.</span> |
| <span class="source-line-no">587</span><span id="line-587"> if ((ord.apply(a[offset + start + i]) & 1) == 0 || sb.length() > MAX_PRECISION + 1) {</span> |
| <span class="source-line-no">588</span><span id="line-588"> src.setPosition(start + i + 1);</span> |
| <span class="source-line-no">589</span><span id="line-589"> break;</span> |
| <span class="source-line-no">590</span><span id="line-590"> }</span> |
| <span class="source-line-no">591</span><span id="line-591"> }</span> |
| <span class="source-line-no">592</span><span id="line-592"> m = new BigDecimal(sb.toString());</span> |
| <span class="source-line-no">593</span><span id="line-593"> int stepsMoveLeft = sb.charAt(0) != '0' ? m.precision() : m.precision() + 1;</span> |
| <span class="source-line-no">594</span><span id="line-594"> stepsMoveLeft -= e * 2;</span> |
| <span class="source-line-no">595</span><span id="line-595"></span> |
| <span class="source-line-no">596</span><span id="line-596"> return normalize(m.movePointLeft(stepsMoveLeft));</span> |
| <span class="source-line-no">597</span><span id="line-597"> }</span> |
| <span class="source-line-no">598</span><span id="line-598"></span> |
| <span class="source-line-no">599</span><span id="line-599"> /**</span> |
| <span class="source-line-no">600</span><span id="line-600"> * Skip {@code src} over the significand bytes.</span> |
| <span class="source-line-no">601</span><span id="line-601"> * @param src The source from which to read encoded digits.</span> |
| <span class="source-line-no">602</span><span id="line-602"> * @param comp Treat encoded bytes as compliments when {@code comp} is true.</span> |
| <span class="source-line-no">603</span><span id="line-603"> * @return the number of bytes skipped.</span> |
| <span class="source-line-no">604</span><span id="line-604"> */</span> |
| <span class="source-line-no">605</span><span id="line-605"> private static int skipSignificand(PositionedByteRange src, boolean comp) {</span> |
| <span class="source-line-no">606</span><span id="line-606"> byte[] a = src.getBytes();</span> |
| <span class="source-line-no">607</span><span id="line-607"> final int offset = src.getOffset(), start = src.getPosition();</span> |
| <span class="source-line-no">608</span><span id="line-608"> int i = src.getPosition();</span> |
| <span class="source-line-no">609</span><span id="line-609"> while (((comp ? DESCENDING : ASCENDING).apply(a[offset + i++]) & 1) != 0)</span> |
| <span class="source-line-no">610</span><span id="line-610"> ;</span> |
| <span class="source-line-no">611</span><span id="line-611"> src.setPosition(i);</span> |
| <span class="source-line-no">612</span><span id="line-612"> return i - start;</span> |
| <span class="source-line-no">613</span><span id="line-613"> }</span> |
| <span class="source-line-no">614</span><span id="line-614"></span> |
| <span class="source-line-no">615</span><span id="line-615"> /**</span> |
| <span class="source-line-no">616</span><span id="line-616"> * <p></span> |
| <span class="source-line-no">617</span><span id="line-617"> * Encode the small magnitude floating point number {@code val} using the key encoding. The caller</span> |
| <span class="source-line-no">618</span><span id="line-618"> * guarantees that 1.0 > abs(val) > 0.0.</span> |
| <span class="source-line-no">619</span><span id="line-619"> * </p></span> |
| <span class="source-line-no">620</span><span id="line-620"> * <p></span> |
| <span class="source-line-no">621</span><span id="line-621"> * A floating point value is encoded as an integer exponent {@code E} and a mantissa {@code M}.</span> |
| <span class="source-line-no">622</span><span id="line-622"> * The original value is equal to {@code (M * 100^E)}. {@code E} is set to the smallest value</span> |
| <span class="source-line-no">623</span><span id="line-623"> * possible without making {@code M} greater than or equal to 1.0.</span> |
| <span class="source-line-no">624</span><span id="line-624"> * </p></span> |
| <span class="source-line-no">625</span><span id="line-625"> * <p></span> |
| <span class="source-line-no">626</span><span id="line-626"> * For this routine, {@code E} will always be zero or negative, since the original value is less</span> |
| <span class="source-line-no">627</span><span id="line-627"> * than one. The encoding written by this routine is the ones-complement of the varint of the</span> |
| <span class="source-line-no">628</span><span id="line-628"> * negative of {@code E} followed by the mantissa:</span> |
| <span class="source-line-no">629</span><span id="line-629"> *</span> |
| <span class="source-line-no">630</span><span id="line-630"> * <pre></span> |
| <span class="source-line-no">631</span><span id="line-631"> * Encoding: ~-E M</span> |
| <span class="source-line-no">632</span><span id="line-632"> * </pre></span> |
| <span class="source-line-no">633</span><span id="line-633"> * </p></span> |
| <span class="source-line-no">634</span><span id="line-634"> * @param dst The destination to which encoded digits are written.</span> |
| <span class="source-line-no">635</span><span id="line-635"> * @param val The value to encode.</span> |
| <span class="source-line-no">636</span><span id="line-636"> * @return the number of bytes written.</span> |
| <span class="source-line-no">637</span><span id="line-637"> */</span> |
| <span class="source-line-no">638</span><span id="line-638"> private static int encodeNumericSmall(PositionedByteRange dst, BigDecimal val) {</span> |
| <span class="source-line-no">639</span><span id="line-639"> // TODO: this can be done faster?</span> |
| <span class="source-line-no">640</span><span id="line-640"> // assert 1.0 > abs(val) > 0.0</span> |
| <span class="source-line-no">641</span><span id="line-641"> BigDecimal abs = val.abs();</span> |
| <span class="source-line-no">642</span><span id="line-642"> assert BigDecimal.ZERO.compareTo(abs) < 0 && BigDecimal.ONE.compareTo(abs) > 0;</span> |
| <span class="source-line-no">643</span><span id="line-643"> byte[] a = dst.getBytes();</span> |
| <span class="source-line-no">644</span><span id="line-644"> boolean isNeg = val.signum() == -1;</span> |
| <span class="source-line-no">645</span><span id="line-645"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">646</span><span id="line-646"></span> |
| <span class="source-line-no">647</span><span id="line-647"> if (isNeg) { /* Small negative number: 0x14, -E, ~M */</span> |
| <span class="source-line-no">648</span><span id="line-648"> dst.put(NEG_SMALL);</span> |
| <span class="source-line-no">649</span><span id="line-649"> } else { /* Small positive number: 0x16, ~-E, M */</span> |
| <span class="source-line-no">650</span><span id="line-650"> dst.put(POS_SMALL);</span> |
| <span class="source-line-no">651</span><span id="line-651"> }</span> |
| <span class="source-line-no">652</span><span id="line-652"></span> |
| <span class="source-line-no">653</span><span id="line-653"> // normalize abs(val) to determine E</span> |
| <span class="source-line-no">654</span><span id="line-654"> int zerosBeforeFirstNonZero = abs.scale() - abs.precision();</span> |
| <span class="source-line-no">655</span><span id="line-655"> int lengthToMoveRight =</span> |
| <span class="source-line-no">656</span><span id="line-656"> zerosBeforeFirstNonZero % 2 == 0 ? zerosBeforeFirstNonZero : zerosBeforeFirstNonZero - 1;</span> |
| <span class="source-line-no">657</span><span id="line-657"> int e = lengthToMoveRight / 2;</span> |
| <span class="source-line-no">658</span><span id="line-658"> abs = abs.movePointRight(lengthToMoveRight);</span> |
| <span class="source-line-no">659</span><span id="line-659"></span> |
| <span class="source-line-no">660</span><span id="line-660"> putVaruint64(dst, e, !isNeg); // encode appropriate E value.</span> |
| <span class="source-line-no">661</span><span id="line-661"></span> |
| <span class="source-line-no">662</span><span id="line-662"> // encode M by peeling off centimal digits, encoding x as 2x+1</span> |
| <span class="source-line-no">663</span><span id="line-663"> int startM = dst.getPosition();</span> |
| <span class="source-line-no">664</span><span id="line-664"> encodeToCentimal(dst, abs);</span> |
| <span class="source-line-no">665</span><span id="line-665"> // terminal digit should be 2x</span> |
| <span class="source-line-no">666</span><span id="line-666"> a[offset + dst.getPosition() - 1] = (byte) (a[offset + dst.getPosition() - 1] & 0xfe);</span> |
| <span class="source-line-no">667</span><span id="line-667"> if (isNeg) {</span> |
| <span class="source-line-no">668</span><span id="line-668"> // negative values encoded as ~M</span> |
| <span class="source-line-no">669</span><span id="line-669"> DESCENDING.apply(a, offset + startM, dst.getPosition() - startM);</span> |
| <span class="source-line-no">670</span><span id="line-670"> }</span> |
| <span class="source-line-no">671</span><span id="line-671"> return dst.getPosition() - start;</span> |
| <span class="source-line-no">672</span><span id="line-672"> }</span> |
| <span class="source-line-no">673</span><span id="line-673"></span> |
| <span class="source-line-no">674</span><span id="line-674"> /**</span> |
| <span class="source-line-no">675</span><span id="line-675"> * Encode the large magnitude floating point number {@code val} using the key encoding. The caller</span> |
| <span class="source-line-no">676</span><span id="line-676"> * guarantees that {@code val} will be finite and abs(val) >= 1.0.</span> |
| <span class="source-line-no">677</span><span id="line-677"> * <p></span> |
| <span class="source-line-no">678</span><span id="line-678"> * A floating point value is encoded as an integer exponent {@code E} and a mantissa {@code M}.</span> |
| <span class="source-line-no">679</span><span id="line-679"> * The original value is equal to {@code (M * 100^E)}. {@code E} is set to the smallest value</span> |
| <span class="source-line-no">680</span><span id="line-680"> * possible without making {@code M} greater than or equal to 1.0.</span> |
| <span class="source-line-no">681</span><span id="line-681"> * </p></span> |
| <span class="source-line-no">682</span><span id="line-682"> * <p></span> |
| <span class="source-line-no">683</span><span id="line-683"> * Each centimal digit of the mantissa is stored in a byte. If the value of the centimal digit is</span> |
| <span class="source-line-no">684</span><span id="line-684"> * {@code X} (hence {@code X>=0} and {@code X<=99}) then the byte value will be {@code 2*X+1} for</span> |
| <span class="source-line-no">685</span><span id="line-685"> * every byte of the mantissa, except for the last byte which will be {@code 2*X+0}. The mantissa</span> |
| <span class="source-line-no">686</span><span id="line-686"> * must be the minimum number of bytes necessary to represent the value; trailing {@code X==0}</span> |
| <span class="source-line-no">687</span><span id="line-687"> * digits are omitted. This means that the mantissa will never contain a byte with the value</span> |
| <span class="source-line-no">688</span><span id="line-688"> * {@code 0x00}.</span> |
| <span class="source-line-no">689</span><span id="line-689"> * </p></span> |
| <span class="source-line-no">690</span><span id="line-690"> * <p></span> |
| <span class="source-line-no">691</span><span id="line-691"> * If {@code E > 10}, then this routine writes of {@code E} as a varint followed by the mantissa</span> |
| <span class="source-line-no">692</span><span id="line-692"> * as described above. Otherwise, if {@code E <= 10}, this routine only writes the mantissa and</span> |
| <span class="source-line-no">693</span><span id="line-693"> * leaves the {@code E} value to be encoded as part of the opening byte of the field by the</span> |
| <span class="source-line-no">694</span><span id="line-694"> * calling function.</span> |
| <span class="source-line-no">695</span><span id="line-695"> *</span> |
| <span class="source-line-no">696</span><span id="line-696"> * <pre></span> |
| <span class="source-line-no">697</span><span id="line-697"> * Encoding: M (if E&lt;=10)</span> |
| <span class="source-line-no">698</span><span id="line-698"> * E M (if E&gt;10)</span> |
| <span class="source-line-no">699</span><span id="line-699"> * </pre></span> |
| <span class="source-line-no">700</span><span id="line-700"> * </p></span> |
| <span class="source-line-no">701</span><span id="line-701"> * @param dst The destination to which encoded digits are written.</span> |
| <span class="source-line-no">702</span><span id="line-702"> * @param val The value to encode.</span> |
| <span class="source-line-no">703</span><span id="line-703"> * @return the number of bytes written.</span> |
| <span class="source-line-no">704</span><span id="line-704"> */</span> |
| <span class="source-line-no">705</span><span id="line-705"> private static int encodeNumericLarge(PositionedByteRange dst, BigDecimal val) {</span> |
| <span class="source-line-no">706</span><span id="line-706"> // TODO: this can be done faster</span> |
| <span class="source-line-no">707</span><span id="line-707"> BigDecimal abs = val.abs();</span> |
| <span class="source-line-no">708</span><span id="line-708"> byte[] a = dst.getBytes();</span> |
| <span class="source-line-no">709</span><span id="line-709"> boolean isNeg = val.signum() == -1;</span> |
| <span class="source-line-no">710</span><span id="line-710"> final int start = dst.getPosition(), offset = dst.getOffset();</span> |
| <span class="source-line-no">711</span><span id="line-711"></span> |
| <span class="source-line-no">712</span><span id="line-712"> if (isNeg) { /* Large negative number: 0x08, ~E, ~M */</span> |
| <span class="source-line-no">713</span><span id="line-713"> dst.put(NEG_LARGE);</span> |
| <span class="source-line-no">714</span><span id="line-714"> } else { /* Large positive number: 0x22, E, M */</span> |
| <span class="source-line-no">715</span><span id="line-715"> dst.put(POS_LARGE);</span> |
| <span class="source-line-no">716</span><span id="line-716"> }</span> |
| <span class="source-line-no">717</span><span id="line-717"></span> |
| <span class="source-line-no">718</span><span id="line-718"> // normalize abs(val) to determine E</span> |
| <span class="source-line-no">719</span><span id="line-719"> int integerDigits = abs.precision() - abs.scale();</span> |
| <span class="source-line-no">720</span><span id="line-720"> int lengthToMoveLeft = integerDigits % 2 == 0 ? integerDigits : integerDigits + 1;</span> |
| <span class="source-line-no">721</span><span id="line-721"> int e = lengthToMoveLeft / 2;</span> |
| <span class="source-line-no">722</span><span id="line-722"> abs = abs.movePointLeft(lengthToMoveLeft);</span> |
| <span class="source-line-no">723</span><span id="line-723"></span> |
| <span class="source-line-no">724</span><span id="line-724"> // encode appropriate header byte and/or E value.</span> |
| <span class="source-line-no">725</span><span id="line-725"> if (e > 10) { /* large number, write out {~,}E */</span> |
| <span class="source-line-no">726</span><span id="line-726"> putVaruint64(dst, e, isNeg);</span> |
| <span class="source-line-no">727</span><span id="line-727"> } else {</span> |
| <span class="source-line-no">728</span><span id="line-728"> if (isNeg) { /* Medium negative number: 0x13-E, ~M */</span> |
| <span class="source-line-no">729</span><span id="line-729"> dst.put(start, (byte) (NEG_MED_MAX - e));</span> |
| <span class="source-line-no">730</span><span id="line-730"> } else { /* Medium positive number: 0x17+E, M */</span> |
| <span class="source-line-no">731</span><span id="line-731"> dst.put(start, (byte) (POS_MED_MIN + e));</span> |
| <span class="source-line-no">732</span><span id="line-732"> }</span> |
| <span class="source-line-no">733</span><span id="line-733"> }</span> |
| <span class="source-line-no">734</span><span id="line-734"></span> |
| <span class="source-line-no">735</span><span id="line-735"> // encode M by peeling off centimal digits, encoding x as 2x+1</span> |
| <span class="source-line-no">736</span><span id="line-736"> int startM = dst.getPosition();</span> |
| <span class="source-line-no">737</span><span id="line-737"> encodeToCentimal(dst, abs);</span> |
| <span class="source-line-no">738</span><span id="line-738"> // terminal digit should be 2x</span> |
| <span class="source-line-no">739</span><span id="line-739"> a[offset + dst.getPosition() - 1] = (byte) (a[offset + dst.getPosition() - 1] & 0xfe);</span> |
| <span class="source-line-no">740</span><span id="line-740"> if (isNeg) {</span> |
| <span class="source-line-no">741</span><span id="line-741"> // negative values encoded as ~M</span> |
| <span class="source-line-no">742</span><span id="line-742"> DESCENDING.apply(a, offset + startM, dst.getPosition() - startM);</span> |
| <span class="source-line-no">743</span><span id="line-743"> }</span> |
| <span class="source-line-no">744</span><span id="line-744"> return dst.getPosition() - start;</span> |
| <span class="source-line-no">745</span><span id="line-745"> }</span> |
| <span class="source-line-no">746</span><span id="line-746"></span> |
| <span class="source-line-no">747</span><span id="line-747"> /**</span> |
| <span class="source-line-no">748</span><span id="line-748"> * Encode a value val in [0.01, 1.0) into Centimals. Util function for</span> |
| <span class="source-line-no">749</span><span id="line-749"> * {@link OrderedBytes#encodeNumericLarge(PositionedByteRange, BigDecimal)} and</span> |
| <span class="source-line-no">750</span><span id="line-750"> * {@link OrderedBytes#encodeNumericSmall(PositionedByteRange, BigDecimal)}</span> |
| <span class="source-line-no">751</span><span id="line-751"> * @param dst The destination to which encoded digits are written.</span> |
| <span class="source-line-no">752</span><span id="line-752"> * @param val A BigDecimal after the normalization. The value must be in [0.01, 1.0).</span> |
| <span class="source-line-no">753</span><span id="line-753"> */</span> |
| <span class="source-line-no">754</span><span id="line-754"> private static void encodeToCentimal(PositionedByteRange dst, BigDecimal val) {</span> |
| <span class="source-line-no">755</span><span id="line-755"> // The input value val must be in [0.01, 1.0)</span> |
| <span class="source-line-no">756</span><span id="line-756"> String stringOfAbs = val.stripTrailingZeros().toPlainString();</span> |
| <span class="source-line-no">757</span><span id="line-757"> String value = stringOfAbs.substring(stringOfAbs.indexOf('.') + 1);</span> |
| <span class="source-line-no">758</span><span id="line-758"> int d;</span> |
| <span class="source-line-no">759</span><span id="line-759"></span> |
| <span class="source-line-no">760</span><span id="line-760"> // If the first float digit is 0, we will encode one digit more than MAX_PRECISION</span> |
| <span class="source-line-no">761</span><span id="line-761"> // We encode at most MAX_PRECISION significant digits into centimals,</span> |
| <span class="source-line-no">762</span><span id="line-762"> // because the input value, has been already normalized.</span> |
| <span class="source-line-no">763</span><span id="line-763"> int maxPrecision = value.charAt(0) == '0' ? MAX_PRECISION + 1 : MAX_PRECISION;</span> |
| <span class="source-line-no">764</span><span id="line-764"> maxPrecision = Math.min(maxPrecision, value.length());</span> |
| <span class="source-line-no">765</span><span id="line-765"> for (int i = 0; i < maxPrecision; i += 2) {</span> |
| <span class="source-line-no">766</span><span id="line-766"> d = (value.charAt(i) - '0') * 10;</span> |
| <span class="source-line-no">767</span><span id="line-767"> if (i + 1 < maxPrecision) {</span> |
| <span class="source-line-no">768</span><span id="line-768"> d += (value.charAt(i + 1) - '0');</span> |
| <span class="source-line-no">769</span><span id="line-769"> }</span> |
| <span class="source-line-no">770</span><span id="line-770"> dst.put((byte) (2 * d + 1));</span> |
| <span class="source-line-no">771</span><span id="line-771"> }</span> |
| <span class="source-line-no">772</span><span id="line-772"> }</span> |
| <span class="source-line-no">773</span><span id="line-773"></span> |
| <span class="source-line-no">774</span><span id="line-774"> /**</span> |
| <span class="source-line-no">775</span><span id="line-775"> * Encode a numerical value using the variable-length encoding.</span> |
| <span class="source-line-no">776</span><span id="line-776"> * @param dst The destination to which encoded digits are written.</span> |
| <span class="source-line-no">777</span><span id="line-777"> * @param val The value to encode.</span> |
| <span class="source-line-no">778</span><span id="line-778"> * @param ord The {@link Order} to respect while encoding {@code val}.</span> |
| <span class="source-line-no">779</span><span id="line-779"> * @return the number of bytes written.</span> |
| <span class="source-line-no">780</span><span id="line-780"> */</span> |
| <span class="source-line-no">781</span><span id="line-781"> public static int encodeNumeric(PositionedByteRange dst, long val, Order ord) {</span> |
| <span class="source-line-no">782</span><span id="line-782"> return encodeNumeric(dst, BigDecimal.valueOf(val), ord);</span> |
| <span class="source-line-no">783</span><span id="line-783"> }</span> |
| <span class="source-line-no">784</span><span id="line-784"></span> |
| <span class="source-line-no">785</span><span id="line-785"> /**</span> |
| <span class="source-line-no">786</span><span id="line-786"> * Encode a numerical value using the variable-length encoding.</span> |
| <span class="source-line-no">787</span><span id="line-787"> * @param dst The destination to which encoded digits are written.</span> |
| <span class="source-line-no">788</span><span id="line-788"> * @param val The value to encode.</span> |
| <span class="source-line-no">789</span><span id="line-789"> * @param ord The {@link Order} to respect while encoding {@code val}.</span> |
| <span class="source-line-no">790</span><span id="line-790"> * @return the number of bytes written.</span> |
| <span class="source-line-no">791</span><span id="line-791"> */</span> |
| <span class="source-line-no">792</span><span id="line-792"> public static int encodeNumeric(PositionedByteRange dst, double val, Order ord) {</span> |
| <span class="source-line-no">793</span><span id="line-793"> if (val == 0.0) {</span> |
| <span class="source-line-no">794</span><span id="line-794"> dst.put(ord.apply(ZERO));</span> |
| <span class="source-line-no">795</span><span id="line-795"> return 1;</span> |
| <span class="source-line-no">796</span><span id="line-796"> }</span> |
| <span class="source-line-no">797</span><span id="line-797"> if (Double.isNaN(val)) {</span> |
| <span class="source-line-no">798</span><span id="line-798"> dst.put(ord.apply(NAN));</span> |
| <span class="source-line-no">799</span><span id="line-799"> return 1;</span> |
| <span class="source-line-no">800</span><span id="line-800"> }</span> |
| <span class="source-line-no">801</span><span id="line-801"> if (val == Double.NEGATIVE_INFINITY) {</span> |
| <span class="source-line-no">802</span><span id="line-802"> dst.put(ord.apply(NEG_INF));</span> |
| <span class="source-line-no">803</span><span id="line-803"> return 1;</span> |
| <span class="source-line-no">804</span><span id="line-804"> }</span> |
| <span class="source-line-no">805</span><span id="line-805"> if (val == Double.POSITIVE_INFINITY) {</span> |
| <span class="source-line-no">806</span><span id="line-806"> dst.put(ord.apply(POS_INF));</span> |
| <span class="source-line-no">807</span><span id="line-807"> return 1;</span> |
| <span class="source-line-no">808</span><span id="line-808"> }</span> |
| <span class="source-line-no">809</span><span id="line-809"> return encodeNumeric(dst, BigDecimal.valueOf(val), ord);</span> |
| <span class="source-line-no">810</span><span id="line-810"> }</span> |
| <span class="source-line-no">811</span><span id="line-811"></span> |
| <span class="source-line-no">812</span><span id="line-812"> /**</span> |
| <span class="source-line-no">813</span><span id="line-813"> * Encode a numerical value using the variable-length encoding. If the number of significant</span> |
| <span class="source-line-no">814</span><span id="line-814"> * digits of the value exceeds the {@link OrderedBytes#MAX_PRECISION}, the exceeding part will be</span> |
| <span class="source-line-no">815</span><span id="line-815"> * lost.</span> |
| <span class="source-line-no">816</span><span id="line-816"> * @param dst The destination to which encoded digits are written.</span> |
| <span class="source-line-no">817</span><span id="line-817"> * @param val The value to encode.</span> |
| <span class="source-line-no">818</span><span id="line-818"> * @param ord The {@link Order} to respect while encoding {@code val}.</span> |
| <span class="source-line-no">819</span><span id="line-819"> * @return the number of bytes written.</span> |
| <span class="source-line-no">820</span><span id="line-820"> */</span> |
| <span class="source-line-no">821</span><span id="line-821"> public static int encodeNumeric(PositionedByteRange dst, BigDecimal val, Order ord) {</span> |
| <span class="source-line-no">822</span><span id="line-822"> final int len, offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">823</span><span id="line-823"> if (null == val) {</span> |
| <span class="source-line-no">824</span><span id="line-824"> return encodeNull(dst, ord);</span> |
| <span class="source-line-no">825</span><span id="line-825"> } else if (BigDecimal.ZERO.compareTo(val) == 0) {</span> |
| <span class="source-line-no">826</span><span id="line-826"> dst.put(ord.apply(ZERO));</span> |
| <span class="source-line-no">827</span><span id="line-827"> return 1;</span> |
| <span class="source-line-no">828</span><span id="line-828"> }</span> |
| <span class="source-line-no">829</span><span id="line-829"> BigDecimal abs = val.abs();</span> |
| <span class="source-line-no">830</span><span id="line-830"> if (BigDecimal.ONE.compareTo(abs) <= 0) { // abs(v) >= 1.0</span> |
| <span class="source-line-no">831</span><span id="line-831"> len = encodeNumericLarge(dst, normalize(val));</span> |
| <span class="source-line-no">832</span><span id="line-832"> } else { // 1.0 > abs(v) >= 0.0</span> |
| <span class="source-line-no">833</span><span id="line-833"> len = encodeNumericSmall(dst, normalize(val));</span> |
| <span class="source-line-no">834</span><span id="line-834"> }</span> |
| <span class="source-line-no">835</span><span id="line-835"> ord.apply(dst.getBytes(), offset + start, len);</span> |
| <span class="source-line-no">836</span><span id="line-836"> return len;</span> |
| <span class="source-line-no">837</span><span id="line-837"> }</span> |
| <span class="source-line-no">838</span><span id="line-838"></span> |
| <span class="source-line-no">839</span><span id="line-839"> /**</span> |
| <span class="source-line-no">840</span><span id="line-840"> * Decode a {@link BigDecimal} from {@code src}. Assumes {@code src} encodes a value in Numeric</span> |
| <span class="source-line-no">841</span><span id="line-841"> * encoding and is within the valid range of {@link BigDecimal} values. {@link BigDecimal} does</span> |
| <span class="source-line-no">842</span><span id="line-842"> * not support {@code NaN} or {@code Infinte} values.</span> |
| <span class="source-line-no">843</span><span id="line-843"> * @see #decodeNumericAsDouble(PositionedByteRange)</span> |
| <span class="source-line-no">844</span><span id="line-844"> */</span> |
| <span class="source-line-no">845</span><span id="line-845"> private static BigDecimal decodeNumericValue(PositionedByteRange src) {</span> |
| <span class="source-line-no">846</span><span id="line-846"> final int e;</span> |
| <span class="source-line-no">847</span><span id="line-847"> byte header = src.get();</span> |
| <span class="source-line-no">848</span><span id="line-848"> boolean dsc = -1 == Integer.signum(header);</span> |
| <span class="source-line-no">849</span><span id="line-849"> header = dsc ? DESCENDING.apply(header) : header;</span> |
| <span class="source-line-no">850</span><span id="line-850"></span> |
| <span class="source-line-no">851</span><span id="line-851"> if (header == NULL) return null;</span> |
| <span class="source-line-no">852</span><span id="line-852"> if (header == NEG_LARGE) { /* Large negative number: 0x08, ~E, ~M */</span> |
| <span class="source-line-no">853</span><span id="line-853"> e = (int) getVaruint64(src, !dsc);</span> |
| <span class="source-line-no">854</span><span id="line-854"> return decodeSignificand(src, e, !dsc).negate();</span> |
| <span class="source-line-no">855</span><span id="line-855"> }</span> |
| <span class="source-line-no">856</span><span id="line-856"> if (header >= NEG_MED_MIN && header <= NEG_MED_MAX) {</span> |
| <span class="source-line-no">857</span><span id="line-857"> /* Medium negative number: 0x13-E, ~M */</span> |
| <span class="source-line-no">858</span><span id="line-858"> e = NEG_MED_MAX - header;</span> |
| <span class="source-line-no">859</span><span id="line-859"> return decodeSignificand(src, e, !dsc).negate();</span> |
| <span class="source-line-no">860</span><span id="line-860"> }</span> |
| <span class="source-line-no">861</span><span id="line-861"> if (header == NEG_SMALL) { /* Small negative number: 0x14, -E, ~M */</span> |
| <span class="source-line-no">862</span><span id="line-862"> e = (int) -getVaruint64(src, dsc);</span> |
| <span class="source-line-no">863</span><span id="line-863"> return decodeSignificand(src, e, !dsc).negate();</span> |
| <span class="source-line-no">864</span><span id="line-864"> }</span> |
| <span class="source-line-no">865</span><span id="line-865"> if (header == ZERO) {</span> |
| <span class="source-line-no">866</span><span id="line-866"> return BigDecimal.ZERO;</span> |
| <span class="source-line-no">867</span><span id="line-867"> }</span> |
| <span class="source-line-no">868</span><span id="line-868"> if (header == POS_SMALL) { /* Small positive number: 0x16, ~-E, M */</span> |
| <span class="source-line-no">869</span><span id="line-869"> e = (int) -getVaruint64(src, !dsc);</span> |
| <span class="source-line-no">870</span><span id="line-870"> return decodeSignificand(src, e, dsc);</span> |
| <span class="source-line-no">871</span><span id="line-871"> }</span> |
| <span class="source-line-no">872</span><span id="line-872"> if (header >= POS_MED_MIN && header <= POS_MED_MAX) {</span> |
| <span class="source-line-no">873</span><span id="line-873"> /* Medium positive number: 0x17+E, M */</span> |
| <span class="source-line-no">874</span><span id="line-874"> e = header - POS_MED_MIN;</span> |
| <span class="source-line-no">875</span><span id="line-875"> return decodeSignificand(src, e, dsc);</span> |
| <span class="source-line-no">876</span><span id="line-876"> }</span> |
| <span class="source-line-no">877</span><span id="line-877"> if (header == POS_LARGE) { /* Large positive number: 0x22, E, M */</span> |
| <span class="source-line-no">878</span><span id="line-878"> e = (int) getVaruint64(src, dsc);</span> |
| <span class="source-line-no">879</span><span id="line-879"> return decodeSignificand(src, e, dsc);</span> |
| <span class="source-line-no">880</span><span id="line-880"> }</span> |
| <span class="source-line-no">881</span><span id="line-881"> throw unexpectedHeader(header);</span> |
| <span class="source-line-no">882</span><span id="line-882"> }</span> |
| <span class="source-line-no">883</span><span id="line-883"></span> |
| <span class="source-line-no">884</span><span id="line-884"> /**</span> |
| <span class="source-line-no">885</span><span id="line-885"> * Decode a primitive {@code double} value from the Numeric encoding. Numeric encoding is based on</span> |
| <span class="source-line-no">886</span><span id="line-886"> * {@link BigDecimal}; in the event the encoded value is larger than can be represented in a</span> |
| <span class="source-line-no">887</span><span id="line-887"> * {@code double}, this method performs an implicit narrowing conversion as described in</span> |
| <span class="source-line-no">888</span><span id="line-888"> * {@link BigDecimal#doubleValue()}.</span> |
| <span class="source-line-no">889</span><span id="line-889"> * @throws NullPointerException when the encoded value is {@code NULL}.</span> |
| <span class="source-line-no">890</span><span id="line-890"> * @throws IllegalArgumentException when the encoded value is not a Numeric.</span> |
| <span class="source-line-no">891</span><span id="line-891"> * @see #encodeNumeric(PositionedByteRange, double, Order)</span> |
| <span class="source-line-no">892</span><span id="line-892"> * @see BigDecimal#doubleValue()</span> |
| <span class="source-line-no">893</span><span id="line-893"> */</span> |
| <span class="source-line-no">894</span><span id="line-894"> public static double decodeNumericAsDouble(PositionedByteRange src) {</span> |
| <span class="source-line-no">895</span><span id="line-895"> // TODO: should an encoded NULL value throw unexpectedHeader() instead?</span> |
| <span class="source-line-no">896</span><span id="line-896"> if (isNull(src)) {</span> |
| <span class="source-line-no">897</span><span id="line-897"> throw new NullPointerException("A null value cannot be decoded to a double.");</span> |
| <span class="source-line-no">898</span><span id="line-898"> }</span> |
| <span class="source-line-no">899</span><span id="line-899"> if (isNumericNaN(src)) {</span> |
| <span class="source-line-no">900</span><span id="line-900"> src.get();</span> |
| <span class="source-line-no">901</span><span id="line-901"> return Double.NaN;</span> |
| <span class="source-line-no">902</span><span id="line-902"> }</span> |
| <span class="source-line-no">903</span><span id="line-903"> if (isNumericZero(src)) {</span> |
| <span class="source-line-no">904</span><span id="line-904"> src.get();</span> |
| <span class="source-line-no">905</span><span id="line-905"> return Double.valueOf(0.0);</span> |
| <span class="source-line-no">906</span><span id="line-906"> }</span> |
| <span class="source-line-no">907</span><span id="line-907"></span> |
| <span class="source-line-no">908</span><span id="line-908"> byte header = -1 == Integer.signum(src.peek()) ? DESCENDING.apply(src.peek()) : src.peek();</span> |
| <span class="source-line-no">909</span><span id="line-909"></span> |
| <span class="source-line-no">910</span><span id="line-910"> if (header == NEG_INF) {</span> |
| <span class="source-line-no">911</span><span id="line-911"> src.get();</span> |
| <span class="source-line-no">912</span><span id="line-912"> return Double.NEGATIVE_INFINITY;</span> |
| <span class="source-line-no">913</span><span id="line-913"> } else if (header == POS_INF) {</span> |
| <span class="source-line-no">914</span><span id="line-914"> src.get();</span> |
| <span class="source-line-no">915</span><span id="line-915"> return Double.POSITIVE_INFINITY;</span> |
| <span class="source-line-no">916</span><span id="line-916"> } else {</span> |
| <span class="source-line-no">917</span><span id="line-917"> return decodeNumericValue(src).doubleValue();</span> |
| <span class="source-line-no">918</span><span id="line-918"> }</span> |
| <span class="source-line-no">919</span><span id="line-919"> }</span> |
| <span class="source-line-no">920</span><span id="line-920"></span> |
| <span class="source-line-no">921</span><span id="line-921"> /**</span> |
| <span class="source-line-no">922</span><span id="line-922"> * Decode a primitive {@code long} value from the Numeric encoding. Numeric encoding is based on</span> |
| <span class="source-line-no">923</span><span id="line-923"> * {@link BigDecimal}; in the event the encoded value is larger than can be represented in a</span> |
| <span class="source-line-no">924</span><span id="line-924"> * {@code long}, this method performs an implicit narrowing conversion as described in</span> |
| <span class="source-line-no">925</span><span id="line-925"> * {@link BigDecimal#doubleValue()}.</span> |
| <span class="source-line-no">926</span><span id="line-926"> * @throws NullPointerException when the encoded value is {@code NULL}.</span> |
| <span class="source-line-no">927</span><span id="line-927"> * @throws IllegalArgumentException when the encoded value is not a Numeric.</span> |
| <span class="source-line-no">928</span><span id="line-928"> * @see #encodeNumeric(PositionedByteRange, long, Order)</span> |
| <span class="source-line-no">929</span><span id="line-929"> * @see BigDecimal#longValue()</span> |
| <span class="source-line-no">930</span><span id="line-930"> */</span> |
| <span class="source-line-no">931</span><span id="line-931"> public static long decodeNumericAsLong(PositionedByteRange src) {</span> |
| <span class="source-line-no">932</span><span id="line-932"> // TODO: should an encoded NULL value throw unexpectedHeader() instead?</span> |
| <span class="source-line-no">933</span><span id="line-933"> if (isNull(src)) throw new NullPointerException();</span> |
| <span class="source-line-no">934</span><span id="line-934"> if (!isNumeric(src)) throw unexpectedHeader(src.peek());</span> |
| <span class="source-line-no">935</span><span id="line-935"> if (isNumericNaN(src)) throw unexpectedHeader(src.peek());</span> |
| <span class="source-line-no">936</span><span id="line-936"> if (isNumericInfinite(src)) throw unexpectedHeader(src.peek());</span> |
| <span class="source-line-no">937</span><span id="line-937"></span> |
| <span class="source-line-no">938</span><span id="line-938"> if (isNumericZero(src)) {</span> |
| <span class="source-line-no">939</span><span id="line-939"> src.get();</span> |
| <span class="source-line-no">940</span><span id="line-940"> return Long.valueOf(0);</span> |
| <span class="source-line-no">941</span><span id="line-941"> }</span> |
| <span class="source-line-no">942</span><span id="line-942"> return decodeNumericValue(src).longValue();</span> |
| <span class="source-line-no">943</span><span id="line-943"> }</span> |
| <span class="source-line-no">944</span><span id="line-944"></span> |
| <span class="source-line-no">945</span><span id="line-945"> /**</span> |
| <span class="source-line-no">946</span><span id="line-946"> * Decode a {@link BigDecimal} value from the variable-length encoding.</span> |
| <span class="source-line-no">947</span><span id="line-947"> * @throws IllegalArgumentException when the encoded value is not a Numeric.</span> |
| <span class="source-line-no">948</span><span id="line-948"> * @see #encodeNumeric(PositionedByteRange, BigDecimal, Order)</span> |
| <span class="source-line-no">949</span><span id="line-949"> */</span> |
| <span class="source-line-no">950</span><span id="line-950"> public static BigDecimal decodeNumericAsBigDecimal(PositionedByteRange src) {</span> |
| <span class="source-line-no">951</span><span id="line-951"> if (isNull(src)) {</span> |
| <span class="source-line-no">952</span><span id="line-952"> src.get();</span> |
| <span class="source-line-no">953</span><span id="line-953"> return null;</span> |
| <span class="source-line-no">954</span><span id="line-954"> }</span> |
| <span class="source-line-no">955</span><span id="line-955"> if (!isNumeric(src)) throw unexpectedHeader(src.peek());</span> |
| <span class="source-line-no">956</span><span id="line-956"> if (isNumericNaN(src)) throw unexpectedHeader(src.peek());</span> |
| <span class="source-line-no">957</span><span id="line-957"> if (isNumericInfinite(src)) throw unexpectedHeader(src.peek());</span> |
| <span class="source-line-no">958</span><span id="line-958"> return decodeNumericValue(src);</span> |
| <span class="source-line-no">959</span><span id="line-959"> }</span> |
| <span class="source-line-no">960</span><span id="line-960"></span> |
| <span class="source-line-no">961</span><span id="line-961"> /**</span> |
| <span class="source-line-no">962</span><span id="line-962"> * Encode a String value. String encoding is 0x00-terminated and so it does not support</span> |
| <span class="source-line-no">963</span><span id="line-963"> * {@code \u0000} codepoints in the value.</span> |
| <span class="source-line-no">964</span><span id="line-964"> * @param dst The destination to which the encoded value is written.</span> |
| <span class="source-line-no">965</span><span id="line-965"> * @param val The value to encode.</span> |
| <span class="source-line-no">966</span><span id="line-966"> * @param ord The {@link Order} to respect while encoding {@code val}.</span> |
| <span class="source-line-no">967</span><span id="line-967"> * @return the number of bytes written.</span> |
| <span class="source-line-no">968</span><span id="line-968"> * @throws IllegalArgumentException when {@code val} contains a {@code \u0000}.</span> |
| <span class="source-line-no">969</span><span id="line-969"> */</span> |
| <span class="source-line-no">970</span><span id="line-970"> public static int encodeString(PositionedByteRange dst, String val, Order ord) {</span> |
| <span class="source-line-no">971</span><span id="line-971"> if (null == val) {</span> |
| <span class="source-line-no">972</span><span id="line-972"> return encodeNull(dst, ord);</span> |
| <span class="source-line-no">973</span><span id="line-973"> }</span> |
| <span class="source-line-no">974</span><span id="line-974"> if (val.contains("\u0000"))</span> |
| <span class="source-line-no">975</span><span id="line-975"> throw new IllegalArgumentException("Cannot encode String values containing '\\u0000'");</span> |
| <span class="source-line-no">976</span><span id="line-976"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">977</span><span id="line-977"> dst.put(TEXT);</span> |
| <span class="source-line-no">978</span><span id="line-978"> // TODO: is there no way to decode into dst directly?</span> |
| <span class="source-line-no">979</span><span id="line-979"> dst.put(val.getBytes(UTF8));</span> |
| <span class="source-line-no">980</span><span id="line-980"> dst.put(TERM);</span> |
| <span class="source-line-no">981</span><span id="line-981"> ord.apply(dst.getBytes(), offset + start, dst.getPosition() - start);</span> |
| <span class="source-line-no">982</span><span id="line-982"> return dst.getPosition() - start;</span> |
| <span class="source-line-no">983</span><span id="line-983"> }</span> |
| <span class="source-line-no">984</span><span id="line-984"></span> |
| <span class="source-line-no">985</span><span id="line-985"> /**</span> |
| <span class="source-line-no">986</span><span id="line-986"> * Decode a String value.</span> |
| <span class="source-line-no">987</span><span id="line-987"> */</span> |
| <span class="source-line-no">988</span><span id="line-988"> public static String decodeString(PositionedByteRange src) {</span> |
| <span class="source-line-no">989</span><span id="line-989"> final byte header = src.get();</span> |
| <span class="source-line-no">990</span><span id="line-990"> if (header == NULL || header == DESCENDING.apply(NULL)) return null;</span> |
| <span class="source-line-no">991</span><span id="line-991"> assert header == TEXT || header == DESCENDING.apply(TEXT);</span> |
| <span class="source-line-no">992</span><span id="line-992"> Order ord = header == TEXT ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">993</span><span id="line-993"> byte[] a = src.getBytes();</span> |
| <span class="source-line-no">994</span><span id="line-994"> final int offset = src.getOffset(), start = src.getPosition();</span> |
| <span class="source-line-no">995</span><span id="line-995"> final byte terminator = ord.apply(TERM);</span> |
| <span class="source-line-no">996</span><span id="line-996"> int rawStartPos = offset + start, rawTermPos = rawStartPos;</span> |
| <span class="source-line-no">997</span><span id="line-997"> for (; a[rawTermPos] != terminator; rawTermPos++)</span> |
| <span class="source-line-no">998</span><span id="line-998"> ;</span> |
| <span class="source-line-no">999</span><span id="line-999"> src.setPosition(rawTermPos - offset + 1); // advance position to TERM + 1</span> |
| <span class="source-line-no">1000</span><span id="line-1000"> if (DESCENDING == ord) {</span> |
| <span class="source-line-no">1001</span><span id="line-1001"> // make a copy so that we don't disturb encoded value with ord.</span> |
| <span class="source-line-no">1002</span><span id="line-1002"> byte[] copy = new byte[rawTermPos - rawStartPos];</span> |
| <span class="source-line-no">1003</span><span id="line-1003"> System.arraycopy(a, rawStartPos, copy, 0, copy.length);</span> |
| <span class="source-line-no">1004</span><span id="line-1004"> ord.apply(copy);</span> |
| <span class="source-line-no">1005</span><span id="line-1005"> return new String(copy, UTF8);</span> |
| <span class="source-line-no">1006</span><span id="line-1006"> } else {</span> |
| <span class="source-line-no">1007</span><span id="line-1007"> return new String(a, rawStartPos, rawTermPos - rawStartPos, UTF8);</span> |
| <span class="source-line-no">1008</span><span id="line-1008"> }</span> |
| <span class="source-line-no">1009</span><span id="line-1009"> }</span> |
| <span class="source-line-no">1010</span><span id="line-1010"></span> |
| <span class="source-line-no">1011</span><span id="line-1011"> /**</span> |
| <span class="source-line-no">1012</span><span id="line-1012"> * Calculate the expected BlobVar encoded length based on unencoded length.</span> |
| <span class="source-line-no">1013</span><span id="line-1013"> */</span> |
| <span class="source-line-no">1014</span><span id="line-1014"> public static int blobVarEncodedLength(int len) {</span> |
| <span class="source-line-no">1015</span><span id="line-1015"> if (0 == len) return 2; // 1-byte header + 1-byte terminator</span> |
| <span class="source-line-no">1016</span><span id="line-1016"> else return (int) Math.ceil((len * 8) // 8-bits per input byte</span> |
| <span class="source-line-no">1017</span><span id="line-1017"> / 7.0) // 7-bits of input data per encoded byte, rounded up</span> |
| <span class="source-line-no">1018</span><span id="line-1018"> + 1; // + 1-byte header</span> |
| <span class="source-line-no">1019</span><span id="line-1019"> }</span> |
| <span class="source-line-no">1020</span><span id="line-1020"></span> |
| <span class="source-line-no">1021</span><span id="line-1021"> /**</span> |
| <span class="source-line-no">1022</span><span id="line-1022"> * Calculate the expected BlobVar decoded length based on encoded length.</span> |
| <span class="source-line-no">1023</span><span id="line-1023"> */</span> |
| <span class="source-line-no">1024</span><span id="line-1024"> static int blobVarDecodedLength(int len) {</span> |
| <span class="source-line-no">1025</span><span id="line-1025"> return ((len - 1) // 1-byte header</span> |
| <span class="source-line-no">1026</span><span id="line-1026"> * 7) // 7-bits of payload per encoded byte</span> |
| <span class="source-line-no">1027</span><span id="line-1027"> / 8; // 8-bits per byte</span> |
| <span class="source-line-no">1028</span><span id="line-1028"> }</span> |
| <span class="source-line-no">1029</span><span id="line-1029"></span> |
| <span class="source-line-no">1030</span><span id="line-1030"> /**</span> |
| <span class="source-line-no">1031</span><span id="line-1031"> * Encode a Blob value using a modified varint encoding scheme.</span> |
| <span class="source-line-no">1032</span><span id="line-1032"> * <p></span> |
| <span class="source-line-no">1033</span><span id="line-1033"> * This format encodes a byte[] value such that no limitations on the input value are imposed. The</span> |
| <span class="source-line-no">1034</span><span id="line-1034"> * first byte encodes the encoding scheme that follows, {@link #BLOB_VAR}. Each encoded byte</span> |
| <span class="source-line-no">1035</span><span id="line-1035"> * thereafter consists of a header bit followed by 7 bits of payload. A header bit of '1'</span> |
| <span class="source-line-no">1036</span><span id="line-1036"> * indicates continuation of the encoding. A header bit of '0' indicates this byte contains the</span> |
| <span class="source-line-no">1037</span><span id="line-1037"> * last of the payload. An empty input value is encoded as the header byte immediately followed by</span> |
| <span class="source-line-no">1038</span><span id="line-1038"> * a termination byte {@code 0x00}. This is not ambiguous with the encoded value of {@code []},</span> |
| <span class="source-line-no">1039</span><span id="line-1039"> * which results in {@code [0x80, 0x00]}.</span> |
| <span class="source-line-no">1040</span><span id="line-1040"> * </p></span> |
| <span class="source-line-no">1041</span><span id="line-1041"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1042</span><span id="line-1042"> */</span> |
| <span class="source-line-no">1043</span><span id="line-1043"> public static int encodeBlobVar(PositionedByteRange dst, byte[] val, int voff, int vlen,</span> |
| <span class="source-line-no">1044</span><span id="line-1044"> Order ord) {</span> |
| <span class="source-line-no">1045</span><span id="line-1045"> if (null == val) {</span> |
| <span class="source-line-no">1046</span><span id="line-1046"> return encodeNull(dst, ord);</span> |
| <span class="source-line-no">1047</span><span id="line-1047"> }</span> |
| <span class="source-line-no">1048</span><span id="line-1048"> // Empty value is null-terminated. All other values are encoded as 7-bits per byte.</span> |
| <span class="source-line-no">1049</span><span id="line-1049"> assert dst.getRemaining() >= blobVarEncodedLength(vlen) : "buffer overflow expected.";</span> |
| <span class="source-line-no">1050</span><span id="line-1050"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1051</span><span id="line-1051"> dst.put(BLOB_VAR);</span> |
| <span class="source-line-no">1052</span><span id="line-1052"> if (0 == vlen) {</span> |
| <span class="source-line-no">1053</span><span id="line-1053"> dst.put(TERM);</span> |
| <span class="source-line-no">1054</span><span id="line-1054"> } else {</span> |
| <span class="source-line-no">1055</span><span id="line-1055"> byte s = 1, t = 0;</span> |
| <span class="source-line-no">1056</span><span id="line-1056"> for (int i = voff; i < vlen; i++) {</span> |
| <span class="source-line-no">1057</span><span id="line-1057"> dst.put((byte) (0x80 | t | ((val[i] & 0xff) >>> s)));</span> |
| <span class="source-line-no">1058</span><span id="line-1058"> if (s < 7) {</span> |
| <span class="source-line-no">1059</span><span id="line-1059"> t = (byte) (val[i] << (7 - s));</span> |
| <span class="source-line-no">1060</span><span id="line-1060"> s++;</span> |
| <span class="source-line-no">1061</span><span id="line-1061"> } else {</span> |
| <span class="source-line-no">1062</span><span id="line-1062"> dst.put((byte) (0x80 | val[i]));</span> |
| <span class="source-line-no">1063</span><span id="line-1063"> s = 1;</span> |
| <span class="source-line-no">1064</span><span id="line-1064"> t = 0;</span> |
| <span class="source-line-no">1065</span><span id="line-1065"> }</span> |
| <span class="source-line-no">1066</span><span id="line-1066"> }</span> |
| <span class="source-line-no">1067</span><span id="line-1067"> if (s > 1) {</span> |
| <span class="source-line-no">1068</span><span id="line-1068"> dst.put((byte) (0x7f & t));</span> |
| <span class="source-line-no">1069</span><span id="line-1069"> } else {</span> |
| <span class="source-line-no">1070</span><span id="line-1070"> dst.getBytes()[offset + dst.getPosition() - 1] =</span> |
| <span class="source-line-no">1071</span><span id="line-1071"> (byte) (dst.getBytes()[offset + dst.getPosition() - 1] & 0x7f);</span> |
| <span class="source-line-no">1072</span><span id="line-1072"> }</span> |
| <span class="source-line-no">1073</span><span id="line-1073"> }</span> |
| <span class="source-line-no">1074</span><span id="line-1074"> ord.apply(dst.getBytes(), offset + start, dst.getPosition() - start);</span> |
| <span class="source-line-no">1075</span><span id="line-1075"> return dst.getPosition() - start;</span> |
| <span class="source-line-no">1076</span><span id="line-1076"> }</span> |
| <span class="source-line-no">1077</span><span id="line-1077"></span> |
| <span class="source-line-no">1078</span><span id="line-1078"> /**</span> |
| <span class="source-line-no">1079</span><span id="line-1079"> * Encode a blob value using a modified varint encoding scheme.</span> |
| <span class="source-line-no">1080</span><span id="line-1080"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1081</span><span id="line-1081"> * @see #encodeBlobVar(PositionedByteRange, byte[], int, int, Order)</span> |
| <span class="source-line-no">1082</span><span id="line-1082"> */</span> |
| <span class="source-line-no">1083</span><span id="line-1083"> public static int encodeBlobVar(PositionedByteRange dst, byte[] val, Order ord) {</span> |
| <span class="source-line-no">1084</span><span id="line-1084"> return encodeBlobVar(dst, val, 0, null != val ? val.length : 0, ord);</span> |
| <span class="source-line-no">1085</span><span id="line-1085"> }</span> |
| <span class="source-line-no">1086</span><span id="line-1086"></span> |
| <span class="source-line-no">1087</span><span id="line-1087"> /**</span> |
| <span class="source-line-no">1088</span><span id="line-1088"> * Decode a blob value that was encoded using BlobVar encoding.</span> |
| <span class="source-line-no">1089</span><span id="line-1089"> */</span> |
| <span class="source-line-no">1090</span><span id="line-1090"> public static byte[] decodeBlobVar(PositionedByteRange src) {</span> |
| <span class="source-line-no">1091</span><span id="line-1091"> final byte header = src.get();</span> |
| <span class="source-line-no">1092</span><span id="line-1092"> if (header == NULL || header == DESCENDING.apply(NULL)) {</span> |
| <span class="source-line-no">1093</span><span id="line-1093"> return null;</span> |
| <span class="source-line-no">1094</span><span id="line-1094"> }</span> |
| <span class="source-line-no">1095</span><span id="line-1095"> assert header == BLOB_VAR || header == DESCENDING.apply(BLOB_VAR);</span> |
| <span class="source-line-no">1096</span><span id="line-1096"> Order ord = BLOB_VAR == header ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1097</span><span id="line-1097"> if (src.peek() == ord.apply(TERM)) {</span> |
| <span class="source-line-no">1098</span><span id="line-1098"> // skip empty input buffer.</span> |
| <span class="source-line-no">1099</span><span id="line-1099"> src.get();</span> |
| <span class="source-line-no">1100</span><span id="line-1100"> return new byte[0];</span> |
| <span class="source-line-no">1101</span><span id="line-1101"> }</span> |
| <span class="source-line-no">1102</span><span id="line-1102"> final int offset = src.getOffset(), start = src.getPosition();</span> |
| <span class="source-line-no">1103</span><span id="line-1103"> int end;</span> |
| <span class="source-line-no">1104</span><span id="line-1104"> byte[] a = src.getBytes();</span> |
| <span class="source-line-no">1105</span><span id="line-1105"> for (end = start; (byte) (ord.apply(a[offset + end]) & 0x80) != TERM; end++)</span> |
| <span class="source-line-no">1106</span><span id="line-1106"> ;</span> |
| <span class="source-line-no">1107</span><span id="line-1107"> end++; // increment end to 1-past last byte</span> |
| <span class="source-line-no">1108</span><span id="line-1108"> // create ret buffer using length of encoded data + 1 (header byte)</span> |
| <span class="source-line-no">1109</span><span id="line-1109"> PositionedByteRange ret =</span> |
| <span class="source-line-no">1110</span><span id="line-1110"> new SimplePositionedMutableByteRange(blobVarDecodedLength(end - start + 1));</span> |
| <span class="source-line-no">1111</span><span id="line-1111"> int s = 6;</span> |
| <span class="source-line-no">1112</span><span id="line-1112"> byte t = (byte) ((ord.apply(a[offset + start]) << 1) & 0xff);</span> |
| <span class="source-line-no">1113</span><span id="line-1113"> for (int i = start + 1; i < end; i++) {</span> |
| <span class="source-line-no">1114</span><span id="line-1114"> if (s == 7) {</span> |
| <span class="source-line-no">1115</span><span id="line-1115"> ret.put((byte) (t | (ord.apply(a[offset + i]) & 0x7f)));</span> |
| <span class="source-line-no">1116</span><span id="line-1116"> i++;</span> |
| <span class="source-line-no">1117</span><span id="line-1117"> // explicitly reset t -- clean up overflow buffer after decoding</span> |
| <span class="source-line-no">1118</span><span id="line-1118"> // a full cycle and retain assertion condition below. This happens</span> |
| <span class="source-line-no">1119</span><span id="line-1119"> t = 0; // when the LSB in the last encoded byte is 1. (HBASE-9893)</span> |
| <span class="source-line-no">1120</span><span id="line-1120"> } else {</span> |
| <span class="source-line-no">1121</span><span id="line-1121"> ret.put((byte) (t | ((ord.apply(a[offset + i]) & 0x7f) >>> s)));</span> |
| <span class="source-line-no">1122</span><span id="line-1122"> }</span> |
| <span class="source-line-no">1123</span><span id="line-1123"> if (i == end) break;</span> |
| <span class="source-line-no">1124</span><span id="line-1124"> t = (byte) ((ord.apply(a[offset + i]) << (8 - s)) & 0xff);</span> |
| <span class="source-line-no">1125</span><span id="line-1125"> s = s == 1 ? 7 : s - 1;</span> |
| <span class="source-line-no">1126</span><span id="line-1126"> }</span> |
| <span class="source-line-no">1127</span><span id="line-1127"> src.setPosition(end);</span> |
| <span class="source-line-no">1128</span><span id="line-1128"> assert t == 0 : "Unexpected bits remaining after decoding blob.";</span> |
| <span class="source-line-no">1129</span><span id="line-1129"> assert ret.getPosition() == ret.getLength() : "Allocated unnecessarily large return buffer.";</span> |
| <span class="source-line-no">1130</span><span id="line-1130"> return ret.getBytes();</span> |
| <span class="source-line-no">1131</span><span id="line-1131"> }</span> |
| <span class="source-line-no">1132</span><span id="line-1132"></span> |
| <span class="source-line-no">1133</span><span id="line-1133"> /**</span> |
| <span class="source-line-no">1134</span><span id="line-1134"> * Encode a Blob value as a byte-for-byte copy. BlobCopy encoding in DESCENDING order is NULL</span> |
| <span class="source-line-no">1135</span><span id="line-1135"> * terminated so as to preserve proper sorting of {@code []} and so it does not support</span> |
| <span class="source-line-no">1136</span><span id="line-1136"> * {@code 0x00} in the value.</span> |
| <span class="source-line-no">1137</span><span id="line-1137"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1138</span><span id="line-1138"> * @throws IllegalArgumentException when {@code ord} is DESCENDING and {@code val} contains a</span> |
| <span class="source-line-no">1139</span><span id="line-1139"> * {@code 0x00} byte.</span> |
| <span class="source-line-no">1140</span><span id="line-1140"> */</span> |
| <span class="source-line-no">1141</span><span id="line-1141"> public static int encodeBlobCopy(PositionedByteRange dst, byte[] val, int voff, int vlen,</span> |
| <span class="source-line-no">1142</span><span id="line-1142"> Order ord) {</span> |
| <span class="source-line-no">1143</span><span id="line-1143"> if (null == val) {</span> |
| <span class="source-line-no">1144</span><span id="line-1144"> encodeNull(dst, ord);</span> |
| <span class="source-line-no">1145</span><span id="line-1145"> if (ASCENDING == ord) return 1;</span> |
| <span class="source-line-no">1146</span><span id="line-1146"> else {</span> |
| <span class="source-line-no">1147</span><span id="line-1147"> // DESCENDING ordered BlobCopy requires a termination bit to preserve</span> |
| <span class="source-line-no">1148</span><span id="line-1148"> // sort-order semantics of null values.</span> |
| <span class="source-line-no">1149</span><span id="line-1149"> dst.put(ord.apply(TERM));</span> |
| <span class="source-line-no">1150</span><span id="line-1150"> return 2;</span> |
| <span class="source-line-no">1151</span><span id="line-1151"> }</span> |
| <span class="source-line-no">1152</span><span id="line-1152"> }</span> |
| <span class="source-line-no">1153</span><span id="line-1153"> // Blobs as final entry in a compound key are written unencoded.</span> |
| <span class="source-line-no">1154</span><span id="line-1154"> assert dst.getRemaining() >= vlen + (ASCENDING == ord ? 1 : 2);</span> |
| <span class="source-line-no">1155</span><span id="line-1155"> if (DESCENDING == ord) {</span> |
| <span class="source-line-no">1156</span><span id="line-1156"> for (int i = 0; i < vlen; i++) {</span> |
| <span class="source-line-no">1157</span><span id="line-1157"> if (TERM == val[voff + i]) {</span> |
| <span class="source-line-no">1158</span><span id="line-1158"> throw new IllegalArgumentException("0x00 bytes not permitted in value.");</span> |
| <span class="source-line-no">1159</span><span id="line-1159"> }</span> |
| <span class="source-line-no">1160</span><span id="line-1160"> }</span> |
| <span class="source-line-no">1161</span><span id="line-1161"> }</span> |
| <span class="source-line-no">1162</span><span id="line-1162"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1163</span><span id="line-1163"> dst.put(BLOB_COPY);</span> |
| <span class="source-line-no">1164</span><span id="line-1164"> dst.put(val, voff, vlen);</span> |
| <span class="source-line-no">1165</span><span id="line-1165"> // DESCENDING ordered BlobCopy requires a termination bit to preserve</span> |
| <span class="source-line-no">1166</span><span id="line-1166"> // sort-order semantics of null values.</span> |
| <span class="source-line-no">1167</span><span id="line-1167"> if (DESCENDING == ord) dst.put(TERM);</span> |
| <span class="source-line-no">1168</span><span id="line-1168"> ord.apply(dst.getBytes(), offset + start, dst.getPosition() - start);</span> |
| <span class="source-line-no">1169</span><span id="line-1169"> return dst.getPosition() - start;</span> |
| <span class="source-line-no">1170</span><span id="line-1170"> }</span> |
| <span class="source-line-no">1171</span><span id="line-1171"></span> |
| <span class="source-line-no">1172</span><span id="line-1172"> /**</span> |
| <span class="source-line-no">1173</span><span id="line-1173"> * Encode a Blob value as a byte-for-byte copy. BlobCopy encoding in DESCENDING order is NULL</span> |
| <span class="source-line-no">1174</span><span id="line-1174"> * terminated so as to preserve proper sorting of {@code []} and so it does not support</span> |
| <span class="source-line-no">1175</span><span id="line-1175"> * {@code 0x00} in the value.</span> |
| <span class="source-line-no">1176</span><span id="line-1176"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1177</span><span id="line-1177"> * @throws IllegalArgumentException when {@code ord} is DESCENDING and {@code val} contains a</span> |
| <span class="source-line-no">1178</span><span id="line-1178"> * {@code 0x00} byte.</span> |
| <span class="source-line-no">1179</span><span id="line-1179"> * @see #encodeBlobCopy(PositionedByteRange, byte[], int, int, Order)</span> |
| <span class="source-line-no">1180</span><span id="line-1180"> */</span> |
| <span class="source-line-no">1181</span><span id="line-1181"> public static int encodeBlobCopy(PositionedByteRange dst, byte[] val, Order ord) {</span> |
| <span class="source-line-no">1182</span><span id="line-1182"> return encodeBlobCopy(dst, val, 0, null != val ? val.length : 0, ord);</span> |
| <span class="source-line-no">1183</span><span id="line-1183"> }</span> |
| <span class="source-line-no">1184</span><span id="line-1184"></span> |
| <span class="source-line-no">1185</span><span id="line-1185"> /**</span> |
| <span class="source-line-no">1186</span><span id="line-1186"> * Decode a Blob value, byte-for-byte copy.</span> |
| <span class="source-line-no">1187</span><span id="line-1187"> * @see #encodeBlobCopy(PositionedByteRange, byte[], int, int, Order)</span> |
| <span class="source-line-no">1188</span><span id="line-1188"> */</span> |
| <span class="source-line-no">1189</span><span id="line-1189"> public static byte[] decodeBlobCopy(PositionedByteRange src) {</span> |
| <span class="source-line-no">1190</span><span id="line-1190"> byte header = src.get();</span> |
| <span class="source-line-no">1191</span><span id="line-1191"> if (header == NULL || header == DESCENDING.apply(NULL)) {</span> |
| <span class="source-line-no">1192</span><span id="line-1192"> return null;</span> |
| <span class="source-line-no">1193</span><span id="line-1193"> }</span> |
| <span class="source-line-no">1194</span><span id="line-1194"> assert header == BLOB_COPY || header == DESCENDING.apply(BLOB_COPY);</span> |
| <span class="source-line-no">1195</span><span id="line-1195"> Order ord = header == BLOB_COPY ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1196</span><span id="line-1196"> final int length = src.getRemaining() - (ASCENDING == ord ? 0 : 1);</span> |
| <span class="source-line-no">1197</span><span id="line-1197"> byte[] ret = new byte[length];</span> |
| <span class="source-line-no">1198</span><span id="line-1198"> src.get(ret);</span> |
| <span class="source-line-no">1199</span><span id="line-1199"> ord.apply(ret, 0, ret.length);</span> |
| <span class="source-line-no">1200</span><span id="line-1200"> // DESCENDING ordered BlobCopy requires a termination bit to preserve</span> |
| <span class="source-line-no">1201</span><span id="line-1201"> // sort-order semantics of null values.</span> |
| <span class="source-line-no">1202</span><span id="line-1202"> if (DESCENDING == ord) src.get();</span> |
| <span class="source-line-no">1203</span><span id="line-1203"> return ret;</span> |
| <span class="source-line-no">1204</span><span id="line-1204"> }</span> |
| <span class="source-line-no">1205</span><span id="line-1205"></span> |
| <span class="source-line-no">1206</span><span id="line-1206"> /**</span> |
| <span class="source-line-no">1207</span><span id="line-1207"> * Encode a null value.</span> |
| <span class="source-line-no">1208</span><span id="line-1208"> * @param dst The destination to which encoded digits are written.</span> |
| <span class="source-line-no">1209</span><span id="line-1209"> * @param ord The {@link Order} to respect while encoding {@code val}.</span> |
| <span class="source-line-no">1210</span><span id="line-1210"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1211</span><span id="line-1211"> */</span> |
| <span class="source-line-no">1212</span><span id="line-1212"> public static int encodeNull(PositionedByteRange dst, Order ord) {</span> |
| <span class="source-line-no">1213</span><span id="line-1213"> dst.put(ord.apply(NULL));</span> |
| <span class="source-line-no">1214</span><span id="line-1214"> return 1;</span> |
| <span class="source-line-no">1215</span><span id="line-1215"> }</span> |
| <span class="source-line-no">1216</span><span id="line-1216"></span> |
| <span class="source-line-no">1217</span><span id="line-1217"> /**</span> |
| <span class="source-line-no">1218</span><span id="line-1218"> * Encode an {@code int8} value using the fixed-length encoding.</span> |
| <span class="source-line-no">1219</span><span id="line-1219"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1220</span><span id="line-1220"> * @see #encodeInt64(PositionedByteRange, long, Order)</span> |
| <span class="source-line-no">1221</span><span id="line-1221"> * @see #decodeInt8(PositionedByteRange)</span> |
| <span class="source-line-no">1222</span><span id="line-1222"> */</span> |
| <span class="source-line-no">1223</span><span id="line-1223"> public static int encodeInt8(PositionedByteRange dst, byte val, Order ord) {</span> |
| <span class="source-line-no">1224</span><span id="line-1224"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1225</span><span id="line-1225"> dst.put(FIXED_INT8).put((byte) (val ^ 0x80));</span> |
| <span class="source-line-no">1226</span><span id="line-1226"> ord.apply(dst.getBytes(), offset + start, 2);</span> |
| <span class="source-line-no">1227</span><span id="line-1227"> return 2;</span> |
| <span class="source-line-no">1228</span><span id="line-1228"> }</span> |
| <span class="source-line-no">1229</span><span id="line-1229"></span> |
| <span class="source-line-no">1230</span><span id="line-1230"> /**</span> |
| <span class="source-line-no">1231</span><span id="line-1231"> * Decode an {@code int8} value.</span> |
| <span class="source-line-no">1232</span><span id="line-1232"> * @see #encodeInt8(PositionedByteRange, byte, Order)</span> |
| <span class="source-line-no">1233</span><span id="line-1233"> */</span> |
| <span class="source-line-no">1234</span><span id="line-1234"> public static byte decodeInt8(PositionedByteRange src) {</span> |
| <span class="source-line-no">1235</span><span id="line-1235"> final byte header = src.get();</span> |
| <span class="source-line-no">1236</span><span id="line-1236"> assert header == FIXED_INT8 || header == DESCENDING.apply(FIXED_INT8);</span> |
| <span class="source-line-no">1237</span><span id="line-1237"> Order ord = header == FIXED_INT8 ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1238</span><span id="line-1238"> return (byte) ((ord.apply(src.get()) ^ 0x80) & 0xff);</span> |
| <span class="source-line-no">1239</span><span id="line-1239"> }</span> |
| <span class="source-line-no">1240</span><span id="line-1240"></span> |
| <span class="source-line-no">1241</span><span id="line-1241"> /**</span> |
| <span class="source-line-no">1242</span><span id="line-1242"> * Encode an {@code int16} value using the fixed-length encoding.</span> |
| <span class="source-line-no">1243</span><span id="line-1243"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1244</span><span id="line-1244"> * @see #encodeInt64(PositionedByteRange, long, Order)</span> |
| <span class="source-line-no">1245</span><span id="line-1245"> * @see #decodeInt16(PositionedByteRange)</span> |
| <span class="source-line-no">1246</span><span id="line-1246"> */</span> |
| <span class="source-line-no">1247</span><span id="line-1247"> public static int encodeInt16(PositionedByteRange dst, short val, Order ord) {</span> |
| <span class="source-line-no">1248</span><span id="line-1248"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1249</span><span id="line-1249"> dst.put(FIXED_INT16).put((byte) ((val >> 8) ^ 0x80)).put((byte) val);</span> |
| <span class="source-line-no">1250</span><span id="line-1250"> ord.apply(dst.getBytes(), offset + start, 3);</span> |
| <span class="source-line-no">1251</span><span id="line-1251"> return 3;</span> |
| <span class="source-line-no">1252</span><span id="line-1252"> }</span> |
| <span class="source-line-no">1253</span><span id="line-1253"></span> |
| <span class="source-line-no">1254</span><span id="line-1254"> /**</span> |
| <span class="source-line-no">1255</span><span id="line-1255"> * Decode an {@code int16} value.</span> |
| <span class="source-line-no">1256</span><span id="line-1256"> * @see #encodeInt16(PositionedByteRange, short, Order)</span> |
| <span class="source-line-no">1257</span><span id="line-1257"> */</span> |
| <span class="source-line-no">1258</span><span id="line-1258"> public static short decodeInt16(PositionedByteRange src) {</span> |
| <span class="source-line-no">1259</span><span id="line-1259"> final byte header = src.get();</span> |
| <span class="source-line-no">1260</span><span id="line-1260"> assert header == FIXED_INT16 || header == DESCENDING.apply(FIXED_INT16);</span> |
| <span class="source-line-no">1261</span><span id="line-1261"> Order ord = header == FIXED_INT16 ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1262</span><span id="line-1262"> short val = (short) ((ord.apply(src.get()) ^ 0x80) & 0xff);</span> |
| <span class="source-line-no">1263</span><span id="line-1263"> val = (short) ((val << 8) + (ord.apply(src.get()) & 0xff));</span> |
| <span class="source-line-no">1264</span><span id="line-1264"> return val;</span> |
| <span class="source-line-no">1265</span><span id="line-1265"> }</span> |
| <span class="source-line-no">1266</span><span id="line-1266"></span> |
| <span class="source-line-no">1267</span><span id="line-1267"> /**</span> |
| <span class="source-line-no">1268</span><span id="line-1268"> * Encode an {@code int32} value using the fixed-length encoding.</span> |
| <span class="source-line-no">1269</span><span id="line-1269"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1270</span><span id="line-1270"> * @see #encodeInt64(PositionedByteRange, long, Order)</span> |
| <span class="source-line-no">1271</span><span id="line-1271"> * @see #decodeInt32(PositionedByteRange)</span> |
| <span class="source-line-no">1272</span><span id="line-1272"> */</span> |
| <span class="source-line-no">1273</span><span id="line-1273"> public static int encodeInt32(PositionedByteRange dst, int val, Order ord) {</span> |
| <span class="source-line-no">1274</span><span id="line-1274"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1275</span><span id="line-1275"> dst.put(FIXED_INT32).put((byte) ((val >> 24) ^ 0x80)).put((byte) (val >> 16))</span> |
| <span class="source-line-no">1276</span><span id="line-1276"> .put((byte) (val >> 8)).put((byte) val);</span> |
| <span class="source-line-no">1277</span><span id="line-1277"> ord.apply(dst.getBytes(), offset + start, 5);</span> |
| <span class="source-line-no">1278</span><span id="line-1278"> return 5;</span> |
| <span class="source-line-no">1279</span><span id="line-1279"> }</span> |
| <span class="source-line-no">1280</span><span id="line-1280"></span> |
| <span class="source-line-no">1281</span><span id="line-1281"> /**</span> |
| <span class="source-line-no">1282</span><span id="line-1282"> * Decode an {@code int32} value.</span> |
| <span class="source-line-no">1283</span><span id="line-1283"> * @see #encodeInt32(PositionedByteRange, int, Order)</span> |
| <span class="source-line-no">1284</span><span id="line-1284"> */</span> |
| <span class="source-line-no">1285</span><span id="line-1285"> public static int decodeInt32(PositionedByteRange src) {</span> |
| <span class="source-line-no">1286</span><span id="line-1286"> final byte header = src.get();</span> |
| <span class="source-line-no">1287</span><span id="line-1287"> assert header == FIXED_INT32 || header == DESCENDING.apply(FIXED_INT32);</span> |
| <span class="source-line-no">1288</span><span id="line-1288"> Order ord = header == FIXED_INT32 ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1289</span><span id="line-1289"> int val = (ord.apply(src.get()) ^ 0x80) & 0xff;</span> |
| <span class="source-line-no">1290</span><span id="line-1290"> for (int i = 1; i < 4; i++) {</span> |
| <span class="source-line-no">1291</span><span id="line-1291"> val = (val << 8) + (ord.apply(src.get()) & 0xff);</span> |
| <span class="source-line-no">1292</span><span id="line-1292"> }</span> |
| <span class="source-line-no">1293</span><span id="line-1293"> return val;</span> |
| <span class="source-line-no">1294</span><span id="line-1294"> }</span> |
| <span class="source-line-no">1295</span><span id="line-1295"></span> |
| <span class="source-line-no">1296</span><span id="line-1296"> /**</span> |
| <span class="source-line-no">1297</span><span id="line-1297"> * Encode an {@code int64} value using the fixed-length encoding.</span> |
| <span class="source-line-no">1298</span><span id="line-1298"> * <p></span> |
| <span class="source-line-no">1299</span><span id="line-1299"> * This format ensures that all longs sort in their natural order, as they would sort when using</span> |
| <span class="source-line-no">1300</span><span id="line-1300"> * signed long comparison.</span> |
| <span class="source-line-no">1301</span><span id="line-1301"> * </p></span> |
| <span class="source-line-no">1302</span><span id="line-1302"> * <p></span> |
| <span class="source-line-no">1303</span><span id="line-1303"> * All Longs are serialized to an 8-byte, fixed-width sortable byte format. Serialization is</span> |
| <span class="source-line-no">1304</span><span id="line-1304"> * performed by inverting the integer sign bit and writing the resulting bytes to the byte array</span> |
| <span class="source-line-no">1305</span><span id="line-1305"> * in big endian order. The encoded value is prefixed by the {@link #FIXED_INT64} header byte.</span> |
| <span class="source-line-no">1306</span><span id="line-1306"> * This encoding is designed to handle java language primitives and so Null values are NOT</span> |
| <span class="source-line-no">1307</span><span id="line-1307"> * supported by this implementation.</span> |
| <span class="source-line-no">1308</span><span id="line-1308"> * </p></span> |
| <span class="source-line-no">1309</span><span id="line-1309"> * <p></span> |
| <span class="source-line-no">1310</span><span id="line-1310"> * For example:</span> |
| <span class="source-line-no">1311</span><span id="line-1311"> * </p></span> |
| <span class="source-line-no">1312</span><span id="line-1312"> *</span> |
| <span class="source-line-no">1313</span><span id="line-1313"> * <pre></span> |
| <span class="source-line-no">1314</span><span id="line-1314"> * Input: 0x0000000000000005 (5)</span> |
| <span class="source-line-no">1315</span><span id="line-1315"> * Result: 0x288000000000000005</span> |
| <span class="source-line-no">1316</span><span id="line-1316"> *</span> |
| <span class="source-line-no">1317</span><span id="line-1317"> * Input: 0xfffffffffffffffb (-4)</span> |
| <span class="source-line-no">1318</span><span id="line-1318"> * Result: 0x280000000000000004</span> |
| <span class="source-line-no">1319</span><span id="line-1319"> *</span> |
| <span class="source-line-no">1320</span><span id="line-1320"> * Input: 0x7fffffffffffffff (Long.MAX_VALUE)</span> |
| <span class="source-line-no">1321</span><span id="line-1321"> * Result: 0x28ffffffffffffffff</span> |
| <span class="source-line-no">1322</span><span id="line-1322"> *</span> |
| <span class="source-line-no">1323</span><span id="line-1323"> * Input: 0x8000000000000000 (Long.MIN_VALUE)</span> |
| <span class="source-line-no">1324</span><span id="line-1324"> * Result: 0x287fffffffffffffff</span> |
| <span class="source-line-no">1325</span><span id="line-1325"> * </pre></span> |
| <span class="source-line-no">1326</span><span id="line-1326"> * <p></span> |
| <span class="source-line-no">1327</span><span id="line-1327"> * This encoding format, and much of this documentation string, is based on Orderly's</span> |
| <span class="source-line-no">1328</span><span id="line-1328"> * {@code FixedIntWritableRowKey}.</span> |
| <span class="source-line-no">1329</span><span id="line-1329"> * </p></span> |
| <span class="source-line-no">1330</span><span id="line-1330"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1331</span><span id="line-1331"> * @see #decodeInt64(PositionedByteRange)</span> |
| <span class="source-line-no">1332</span><span id="line-1332"> */</span> |
| <span class="source-line-no">1333</span><span id="line-1333"> public static int encodeInt64(PositionedByteRange dst, long val, Order ord) {</span> |
| <span class="source-line-no">1334</span><span id="line-1334"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1335</span><span id="line-1335"> dst.put(FIXED_INT64).put((byte) ((val >> 56) ^ 0x80)).put((byte) (val >> 48))</span> |
| <span class="source-line-no">1336</span><span id="line-1336"> .put((byte) (val >> 40)).put((byte) (val >> 32)).put((byte) (val >> 24))</span> |
| <span class="source-line-no">1337</span><span id="line-1337"> .put((byte) (val >> 16)).put((byte) (val >> 8)).put((byte) val);</span> |
| <span class="source-line-no">1338</span><span id="line-1338"> ord.apply(dst.getBytes(), offset + start, 9);</span> |
| <span class="source-line-no">1339</span><span id="line-1339"> return 9;</span> |
| <span class="source-line-no">1340</span><span id="line-1340"> }</span> |
| <span class="source-line-no">1341</span><span id="line-1341"></span> |
| <span class="source-line-no">1342</span><span id="line-1342"> /**</span> |
| <span class="source-line-no">1343</span><span id="line-1343"> * Decode an {@code int64} value.</span> |
| <span class="source-line-no">1344</span><span id="line-1344"> * @see #encodeInt64(PositionedByteRange, long, Order)</span> |
| <span class="source-line-no">1345</span><span id="line-1345"> */</span> |
| <span class="source-line-no">1346</span><span id="line-1346"> public static long decodeInt64(PositionedByteRange src) {</span> |
| <span class="source-line-no">1347</span><span id="line-1347"> final byte header = src.get();</span> |
| <span class="source-line-no">1348</span><span id="line-1348"> assert header == FIXED_INT64 || header == DESCENDING.apply(FIXED_INT64);</span> |
| <span class="source-line-no">1349</span><span id="line-1349"> Order ord = header == FIXED_INT64 ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1350</span><span id="line-1350"> long val = (ord.apply(src.get()) ^ 0x80) & 0xff;</span> |
| <span class="source-line-no">1351</span><span id="line-1351"> for (int i = 1; i < 8; i++) {</span> |
| <span class="source-line-no">1352</span><span id="line-1352"> val = (val << 8) + (ord.apply(src.get()) & 0xff);</span> |
| <span class="source-line-no">1353</span><span id="line-1353"> }</span> |
| <span class="source-line-no">1354</span><span id="line-1354"> return val;</span> |
| <span class="source-line-no">1355</span><span id="line-1355"> }</span> |
| <span class="source-line-no">1356</span><span id="line-1356"></span> |
| <span class="source-line-no">1357</span><span id="line-1357"> /**</span> |
| <span class="source-line-no">1358</span><span id="line-1358"> * Encode a 32-bit floating point value using the fixed-length encoding. Encoding format is</span> |
| <span class="source-line-no">1359</span><span id="line-1359"> * described at length in {@link #encodeFloat64(PositionedByteRange, double, Order)}.</span> |
| <span class="source-line-no">1360</span><span id="line-1360"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1361</span><span id="line-1361"> * @see #decodeFloat32(PositionedByteRange)</span> |
| <span class="source-line-no">1362</span><span id="line-1362"> * @see #encodeFloat64(PositionedByteRange, double, Order)</span> |
| <span class="source-line-no">1363</span><span id="line-1363"> */</span> |
| <span class="source-line-no">1364</span><span id="line-1364"> public static int encodeFloat32(PositionedByteRange dst, float val, Order ord) {</span> |
| <span class="source-line-no">1365</span><span id="line-1365"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1366</span><span id="line-1366"> int i = Float.floatToIntBits(val);</span> |
| <span class="source-line-no">1367</span><span id="line-1367"> i ^= ((i >> (Integer.SIZE - 1)) | Integer.MIN_VALUE);</span> |
| <span class="source-line-no">1368</span><span id="line-1368"> dst.put(FIXED_FLOAT32).put((byte) (i >> 24)).put((byte) (i >> 16)).put((byte) (i >> 8))</span> |
| <span class="source-line-no">1369</span><span id="line-1369"> .put((byte) i);</span> |
| <span class="source-line-no">1370</span><span id="line-1370"> ord.apply(dst.getBytes(), offset + start, 5);</span> |
| <span class="source-line-no">1371</span><span id="line-1371"> return 5;</span> |
| <span class="source-line-no">1372</span><span id="line-1372"> }</span> |
| <span class="source-line-no">1373</span><span id="line-1373"></span> |
| <span class="source-line-no">1374</span><span id="line-1374"> /**</span> |
| <span class="source-line-no">1375</span><span id="line-1375"> * Decode a 32-bit floating point value using the fixed-length encoding.</span> |
| <span class="source-line-no">1376</span><span id="line-1376"> * @see #encodeFloat32(PositionedByteRange, float, Order)</span> |
| <span class="source-line-no">1377</span><span id="line-1377"> */</span> |
| <span class="source-line-no">1378</span><span id="line-1378"> public static float decodeFloat32(PositionedByteRange src) {</span> |
| <span class="source-line-no">1379</span><span id="line-1379"> final byte header = src.get();</span> |
| <span class="source-line-no">1380</span><span id="line-1380"> assert header == FIXED_FLOAT32 || header == DESCENDING.apply(FIXED_FLOAT32);</span> |
| <span class="source-line-no">1381</span><span id="line-1381"> Order ord = header == FIXED_FLOAT32 ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1382</span><span id="line-1382"> int val = ord.apply(src.get()) & 0xff;</span> |
| <span class="source-line-no">1383</span><span id="line-1383"> for (int i = 1; i < 4; i++) {</span> |
| <span class="source-line-no">1384</span><span id="line-1384"> val = (val << 8) + (ord.apply(src.get()) & 0xff);</span> |
| <span class="source-line-no">1385</span><span id="line-1385"> }</span> |
| <span class="source-line-no">1386</span><span id="line-1386"> val ^= (~val >> (Integer.SIZE - 1)) | Integer.MIN_VALUE;</span> |
| <span class="source-line-no">1387</span><span id="line-1387"> return Float.intBitsToFloat(val);</span> |
| <span class="source-line-no">1388</span><span id="line-1388"> }</span> |
| <span class="source-line-no">1389</span><span id="line-1389"></span> |
| <span class="source-line-no">1390</span><span id="line-1390"> /**</span> |
| <span class="source-line-no">1391</span><span id="line-1391"> * Encode a 64-bit floating point value using the fixed-length encoding.</span> |
| <span class="source-line-no">1392</span><span id="line-1392"> * <p></span> |
| <span class="source-line-no">1393</span><span id="line-1393"> * This format ensures the following total ordering of floating point values:</span> |
| <span class="source-line-no">1394</span><span id="line-1394"> * Double.NEGATIVE_INFINITY &lt; -Double.MAX_VALUE &lt; ... &lt; -Double.MIN_VALUE &lt; -0.0 &lt;</span> |
| <span class="source-line-no">1395</span><span id="line-1395"> * +0.0; &lt; Double.MIN_VALUE &lt; ... &lt; Double.MAX_VALUE &lt; Double.POSITIVE_INFINITY &lt;</span> |
| <span class="source-line-no">1396</span><span id="line-1396"> * Double.NaN</span> |
| <span class="source-line-no">1397</span><span id="line-1397"> * </p></span> |
| <span class="source-line-no">1398</span><span id="line-1398"> * <p></span> |
| <span class="source-line-no">1399</span><span id="line-1399"> * Floating point numbers are encoded as specified in IEEE 754. A 64-bit double precision float</span> |
| <span class="source-line-no">1400</span><span id="line-1400"> * consists of a sign bit, 11-bit unsigned exponent encoded in offset-1023 notation, and a 52-bit</span> |
| <span class="source-line-no">1401</span><span id="line-1401"> * significand. The format is described further in the</span> |
| <span class="source-line-no">1402</span><span id="line-1402"> * <a href="http://en.wikipedia.org/wiki/Double_precision"> Double Precision Floating Point</span> |
| <span class="source-line-no">1403</span><span id="line-1403"> * Wikipedia page</a></span> |
| <span class="source-line-no">1404</span><span id="line-1404"> * </p></span> |
| <span class="source-line-no">1405</span><span id="line-1405"> * <p></span> |
| <span class="source-line-no">1406</span><span id="line-1406"> * The value of a normal float is -1 <sup>sign bit</sup> &times; 2<sup>exponent - 1023</sup></span> |
| <span class="source-line-no">1407</span><span id="line-1407"> * &times; 1.significand</span> |
| <span class="source-line-no">1408</span><span id="line-1408"> * </p></span> |
| <span class="source-line-no">1409</span><span id="line-1409"> * <p></span> |
| <span class="source-line-no">1410</span><span id="line-1410"> * The IEE754 floating point format already preserves sort ordering for positive floating point</span> |
| <span class="source-line-no">1411</span><span id="line-1411"> * numbers when the raw bytes are compared in most significant byte order. This is discussed</span> |
| <span class="source-line-no">1412</span><span id="line-1412"> * further at</span> |
| <span class="source-line-no">1413</span><span id="line-1413"> * <a href= "http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm" ></span> |
| <span class="source-line-no">1414</span><span id="line-1414"> * http://www.cygnus-software.com/papers/comparingfloats/comparingfloats. htm</a></span> |
| <span class="source-line-no">1415</span><span id="line-1415"> * </p></span> |
| <span class="source-line-no">1416</span><span id="line-1416"> * <p></span> |
| <span class="source-line-no">1417</span><span id="line-1417"> * Thus, we need only ensure that negative numbers sort in the the exact opposite order as</span> |
| <span class="source-line-no">1418</span><span id="line-1418"> * positive numbers (so that say, negative infinity is less than negative 1), and that all</span> |
| <span class="source-line-no">1419</span><span id="line-1419"> * negative numbers compare less than any positive number. To accomplish this, we invert the sign</span> |
| <span class="source-line-no">1420</span><span id="line-1420"> * bit of all floating point numbers, and we also invert the exponent and significand bits if the</span> |
| <span class="source-line-no">1421</span><span id="line-1421"> * floating point number was negative.</span> |
| <span class="source-line-no">1422</span><span id="line-1422"> * </p></span> |
| <span class="source-line-no">1423</span><span id="line-1423"> * <p></span> |
| <span class="source-line-no">1424</span><span id="line-1424"> * More specifically, we first store the floating point bits into a 64-bit long {@code l} using</span> |
| <span class="source-line-no">1425</span><span id="line-1425"> * {@link Double#doubleToLongBits}. This method collapses all NaNs into a single, canonical NaN</span> |
| <span class="source-line-no">1426</span><span id="line-1426"> * value but otherwise leaves the bits unchanged. We then compute</span> |
| <span class="source-line-no">1427</span><span id="line-1427"> * </p></span> |
| <span class="source-line-no">1428</span><span id="line-1428"> *</span> |
| <span class="source-line-no">1429</span><span id="line-1429"> * <pre></span> |
| <span class="source-line-no">1430</span><span id="line-1430"> * l &circ;= (l &gt;&gt; (Long.SIZE - 1)) | Long.MIN_SIZE</span> |
| <span class="source-line-no">1431</span><span id="line-1431"> * </pre></span> |
| <span class="source-line-no">1432</span><span id="line-1432"> * <p></span> |
| <span class="source-line-no">1433</span><span id="line-1433"> * which inverts the sign bit and XOR's all other bits with the sign bit itself. Comparing the raw</span> |
| <span class="source-line-no">1434</span><span id="line-1434"> * bytes of {@code l} in most significant byte order is equivalent to performing a double</span> |
| <span class="source-line-no">1435</span><span id="line-1435"> * precision floating point comparison on the underlying bits (ignoring NaN comparisons, as NaNs</span> |
| <span class="source-line-no">1436</span><span id="line-1436"> * don't compare equal to anything when performing floating point comparisons).</span> |
| <span class="source-line-no">1437</span><span id="line-1437"> * </p></span> |
| <span class="source-line-no">1438</span><span id="line-1438"> * <p></span> |
| <span class="source-line-no">1439</span><span id="line-1439"> * The resulting long integer is then converted into a byte array by serializing the long one byte</span> |
| <span class="source-line-no">1440</span><span id="line-1440"> * at a time in most significant byte order. The serialized integer is prefixed by a single header</span> |
| <span class="source-line-no">1441</span><span id="line-1441"> * byte. All serialized values are 9 bytes in length.</span> |
| <span class="source-line-no">1442</span><span id="line-1442"> * </p></span> |
| <span class="source-line-no">1443</span><span id="line-1443"> * <p></span> |
| <span class="source-line-no">1444</span><span id="line-1444"> * This encoding format, and much of this highly detailed documentation string, is based on</span> |
| <span class="source-line-no">1445</span><span id="line-1445"> * Orderly's {@code DoubleWritableRowKey}.</span> |
| <span class="source-line-no">1446</span><span id="line-1446"> * </p></span> |
| <span class="source-line-no">1447</span><span id="line-1447"> * @return the number of bytes written.</span> |
| <span class="source-line-no">1448</span><span id="line-1448"> * @see #decodeFloat64(PositionedByteRange)</span> |
| <span class="source-line-no">1449</span><span id="line-1449"> */</span> |
| <span class="source-line-no">1450</span><span id="line-1450"> public static int encodeFloat64(PositionedByteRange dst, double val, Order ord) {</span> |
| <span class="source-line-no">1451</span><span id="line-1451"> final int offset = dst.getOffset(), start = dst.getPosition();</span> |
| <span class="source-line-no">1452</span><span id="line-1452"> long lng = Double.doubleToLongBits(val);</span> |
| <span class="source-line-no">1453</span><span id="line-1453"> lng ^= ((lng >> (Long.SIZE - 1)) | Long.MIN_VALUE);</span> |
| <span class="source-line-no">1454</span><span id="line-1454"> dst.put(FIXED_FLOAT64).put((byte) (lng >> 56)).put((byte) (lng >> 48)).put((byte) (lng >> 40))</span> |
| <span class="source-line-no">1455</span><span id="line-1455"> .put((byte) (lng >> 32)).put((byte) (lng >> 24)).put((byte) (lng >> 16))</span> |
| <span class="source-line-no">1456</span><span id="line-1456"> .put((byte) (lng >> 8)).put((byte) lng);</span> |
| <span class="source-line-no">1457</span><span id="line-1457"> ord.apply(dst.getBytes(), offset + start, 9);</span> |
| <span class="source-line-no">1458</span><span id="line-1458"> return 9;</span> |
| <span class="source-line-no">1459</span><span id="line-1459"> }</span> |
| <span class="source-line-no">1460</span><span id="line-1460"></span> |
| <span class="source-line-no">1461</span><span id="line-1461"> /**</span> |
| <span class="source-line-no">1462</span><span id="line-1462"> * Decode a 64-bit floating point value using the fixed-length encoding.</span> |
| <span class="source-line-no">1463</span><span id="line-1463"> * @see #encodeFloat64(PositionedByteRange, double, Order)</span> |
| <span class="source-line-no">1464</span><span id="line-1464"> */</span> |
| <span class="source-line-no">1465</span><span id="line-1465"> public static double decodeFloat64(PositionedByteRange src) {</span> |
| <span class="source-line-no">1466</span><span id="line-1466"> final byte header = src.get();</span> |
| <span class="source-line-no">1467</span><span id="line-1467"> assert header == FIXED_FLOAT64 || header == DESCENDING.apply(FIXED_FLOAT64);</span> |
| <span class="source-line-no">1468</span><span id="line-1468"> Order ord = header == FIXED_FLOAT64 ? ASCENDING : DESCENDING;</span> |
| <span class="source-line-no">1469</span><span id="line-1469"> long val = ord.apply(src.get()) & 0xff;</span> |
| <span class="source-line-no">1470</span><span id="line-1470"> for (int i = 1; i < 8; i++) {</span> |
| <span class="source-line-no">1471</span><span id="line-1471"> val = (val << 8) + (ord.apply(src.get()) & 0xff);</span> |
| <span class="source-line-no">1472</span><span id="line-1472"> }</span> |
| <span class="source-line-no">1473</span><span id="line-1473"> val ^= (~val >> (Long.SIZE - 1)) | Long.MIN_VALUE;</span> |
| <span class="source-line-no">1474</span><span id="line-1474"> return Double.longBitsToDouble(val);</span> |
| <span class="source-line-no">1475</span><span id="line-1475"> }</span> |
| <span class="source-line-no">1476</span><span id="line-1476"></span> |
| <span class="source-line-no">1477</span><span id="line-1477"> /**</span> |
| <span class="source-line-no">1478</span><span id="line-1478"> * Returns true when {@code src} appears to be positioned an encoded value, false otherwise.</span> |
| <span class="source-line-no">1479</span><span id="line-1479"> */</span> |
| <span class="source-line-no">1480</span><span id="line-1480"> public static boolean isEncodedValue(PositionedByteRange src) {</span> |
| <span class="source-line-no">1481</span><span id="line-1481"> return isNull(src) || isNumeric(src) || isFixedInt8(src) || isFixedInt16(src)</span> |
| <span class="source-line-no">1482</span><span id="line-1482"> || isFixedInt32(src) || isFixedInt64(src) || isFixedFloat32(src) || isFixedFloat64(src)</span> |
| <span class="source-line-no">1483</span><span id="line-1483"> || isText(src) || isBlobCopy(src) || isBlobVar(src);</span> |
| <span class="source-line-no">1484</span><span id="line-1484"> }</span> |
| <span class="source-line-no">1485</span><span id="line-1485"></span> |
| <span class="source-line-no">1486</span><span id="line-1486"> /**</span> |
| <span class="source-line-no">1487</span><span id="line-1487"> * Return true when the next encoded value in {@code src} is null, false otherwise.</span> |
| <span class="source-line-no">1488</span><span id="line-1488"> */</span> |
| <span class="source-line-no">1489</span><span id="line-1489"> public static boolean isNull(PositionedByteRange src) {</span> |
| <span class="source-line-no">1490</span><span id="line-1490"> return NULL == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1491</span><span id="line-1491"> }</span> |
| <span class="source-line-no">1492</span><span id="line-1492"></span> |
| <span class="source-line-no">1493</span><span id="line-1493"> /**</span> |
| <span class="source-line-no">1494</span><span id="line-1494"> * Return true when the next encoded value in {@code src} uses Numeric encoding, false otherwise.</span> |
| <span class="source-line-no">1495</span><span id="line-1495"> * {@code NaN}, {@code +/-Inf} are valid Numeric values.</span> |
| <span class="source-line-no">1496</span><span id="line-1496"> */</span> |
| <span class="source-line-no">1497</span><span id="line-1497"> public static boolean isNumeric(PositionedByteRange src) {</span> |
| <span class="source-line-no">1498</span><span id="line-1498"> byte x = (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1499</span><span id="line-1499"> return x >= NEG_INF && x <= NAN;</span> |
| <span class="source-line-no">1500</span><span id="line-1500"> }</span> |
| <span class="source-line-no">1501</span><span id="line-1501"></span> |
| <span class="source-line-no">1502</span><span id="line-1502"> /**</span> |
| <span class="source-line-no">1503</span><span id="line-1503"> * Return true when the next encoded value in {@code src} uses Numeric encoding and is</span> |
| <span class="source-line-no">1504</span><span id="line-1504"> * {@code Infinite}, false otherwise.</span> |
| <span class="source-line-no">1505</span><span id="line-1505"> */</span> |
| <span class="source-line-no">1506</span><span id="line-1506"> public static boolean isNumericInfinite(PositionedByteRange src) {</span> |
| <span class="source-line-no">1507</span><span id="line-1507"> byte x = (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1508</span><span id="line-1508"> return NEG_INF == x || POS_INF == x;</span> |
| <span class="source-line-no">1509</span><span id="line-1509"> }</span> |
| <span class="source-line-no">1510</span><span id="line-1510"></span> |
| <span class="source-line-no">1511</span><span id="line-1511"> /**</span> |
| <span class="source-line-no">1512</span><span id="line-1512"> * Return true when the next encoded value in {@code src} uses Numeric encoding and is</span> |
| <span class="source-line-no">1513</span><span id="line-1513"> * {@code NaN}, false otherwise.</span> |
| <span class="source-line-no">1514</span><span id="line-1514"> */</span> |
| <span class="source-line-no">1515</span><span id="line-1515"> public static boolean isNumericNaN(PositionedByteRange src) {</span> |
| <span class="source-line-no">1516</span><span id="line-1516"> return NAN == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1517</span><span id="line-1517"> }</span> |
| <span class="source-line-no">1518</span><span id="line-1518"></span> |
| <span class="source-line-no">1519</span><span id="line-1519"> /**</span> |
| <span class="source-line-no">1520</span><span id="line-1520"> * Return true when the next encoded value in {@code src} uses Numeric encoding and is {@code 0},</span> |
| <span class="source-line-no">1521</span><span id="line-1521"> * false otherwise.</span> |
| <span class="source-line-no">1522</span><span id="line-1522"> */</span> |
| <span class="source-line-no">1523</span><span id="line-1523"> public static boolean isNumericZero(PositionedByteRange src) {</span> |
| <span class="source-line-no">1524</span><span id="line-1524"> return ZERO == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1525</span><span id="line-1525"> }</span> |
| <span class="source-line-no">1526</span><span id="line-1526"></span> |
| <span class="source-line-no">1527</span><span id="line-1527"> /**</span> |
| <span class="source-line-no">1528</span><span id="line-1528"> * Return true when the next encoded value in {@code src} uses fixed-width Int8 encoding, false</span> |
| <span class="source-line-no">1529</span><span id="line-1529"> * otherwise.</span> |
| <span class="source-line-no">1530</span><span id="line-1530"> */</span> |
| <span class="source-line-no">1531</span><span id="line-1531"> public static boolean isFixedInt8(PositionedByteRange src) {</span> |
| <span class="source-line-no">1532</span><span id="line-1532"> return FIXED_INT8</span> |
| <span class="source-line-no">1533</span><span id="line-1533"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1534</span><span id="line-1534"> }</span> |
| <span class="source-line-no">1535</span><span id="line-1535"></span> |
| <span class="source-line-no">1536</span><span id="line-1536"> /**</span> |
| <span class="source-line-no">1537</span><span id="line-1537"> * Return true when the next encoded value in {@code src} uses fixed-width Int16 encoding, false</span> |
| <span class="source-line-no">1538</span><span id="line-1538"> * otherwise.</span> |
| <span class="source-line-no">1539</span><span id="line-1539"> */</span> |
| <span class="source-line-no">1540</span><span id="line-1540"> public static boolean isFixedInt16(PositionedByteRange src) {</span> |
| <span class="source-line-no">1541</span><span id="line-1541"> return FIXED_INT16</span> |
| <span class="source-line-no">1542</span><span id="line-1542"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1543</span><span id="line-1543"> }</span> |
| <span class="source-line-no">1544</span><span id="line-1544"></span> |
| <span class="source-line-no">1545</span><span id="line-1545"> /**</span> |
| <span class="source-line-no">1546</span><span id="line-1546"> * Return true when the next encoded value in {@code src} uses fixed-width Int32 encoding, false</span> |
| <span class="source-line-no">1547</span><span id="line-1547"> * otherwise.</span> |
| <span class="source-line-no">1548</span><span id="line-1548"> */</span> |
| <span class="source-line-no">1549</span><span id="line-1549"> public static boolean isFixedInt32(PositionedByteRange src) {</span> |
| <span class="source-line-no">1550</span><span id="line-1550"> return FIXED_INT32</span> |
| <span class="source-line-no">1551</span><span id="line-1551"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1552</span><span id="line-1552"> }</span> |
| <span class="source-line-no">1553</span><span id="line-1553"></span> |
| <span class="source-line-no">1554</span><span id="line-1554"> /**</span> |
| <span class="source-line-no">1555</span><span id="line-1555"> * Return true when the next encoded value in {@code src} uses fixed-width Int64 encoding, false</span> |
| <span class="source-line-no">1556</span><span id="line-1556"> * otherwise.</span> |
| <span class="source-line-no">1557</span><span id="line-1557"> */</span> |
| <span class="source-line-no">1558</span><span id="line-1558"> public static boolean isFixedInt64(PositionedByteRange src) {</span> |
| <span class="source-line-no">1559</span><span id="line-1559"> return FIXED_INT64</span> |
| <span class="source-line-no">1560</span><span id="line-1560"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1561</span><span id="line-1561"> }</span> |
| <span class="source-line-no">1562</span><span id="line-1562"></span> |
| <span class="source-line-no">1563</span><span id="line-1563"> /**</span> |
| <span class="source-line-no">1564</span><span id="line-1564"> * Return true when the next encoded value in {@code src} uses fixed-width Float32 encoding, false</span> |
| <span class="source-line-no">1565</span><span id="line-1565"> * otherwise.</span> |
| <span class="source-line-no">1566</span><span id="line-1566"> */</span> |
| <span class="source-line-no">1567</span><span id="line-1567"> public static boolean isFixedFloat32(PositionedByteRange src) {</span> |
| <span class="source-line-no">1568</span><span id="line-1568"> return FIXED_FLOAT32</span> |
| <span class="source-line-no">1569</span><span id="line-1569"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1570</span><span id="line-1570"> }</span> |
| <span class="source-line-no">1571</span><span id="line-1571"></span> |
| <span class="source-line-no">1572</span><span id="line-1572"> /**</span> |
| <span class="source-line-no">1573</span><span id="line-1573"> * Return true when the next encoded value in {@code src} uses fixed-width Float64 encoding, false</span> |
| <span class="source-line-no">1574</span><span id="line-1574"> * otherwise.</span> |
| <span class="source-line-no">1575</span><span id="line-1575"> */</span> |
| <span class="source-line-no">1576</span><span id="line-1576"> public static boolean isFixedFloat64(PositionedByteRange src) {</span> |
| <span class="source-line-no">1577</span><span id="line-1577"> return FIXED_FLOAT64</span> |
| <span class="source-line-no">1578</span><span id="line-1578"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1579</span><span id="line-1579"> }</span> |
| <span class="source-line-no">1580</span><span id="line-1580"></span> |
| <span class="source-line-no">1581</span><span id="line-1581"> /**</span> |
| <span class="source-line-no">1582</span><span id="line-1582"> * Return true when the next encoded value in {@code src} uses Text encoding, false otherwise.</span> |
| <span class="source-line-no">1583</span><span id="line-1583"> */</span> |
| <span class="source-line-no">1584</span><span id="line-1584"> public static boolean isText(PositionedByteRange src) {</span> |
| <span class="source-line-no">1585</span><span id="line-1585"> return TEXT == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1586</span><span id="line-1586"> }</span> |
| <span class="source-line-no">1587</span><span id="line-1587"></span> |
| <span class="source-line-no">1588</span><span id="line-1588"> /**</span> |
| <span class="source-line-no">1589</span><span id="line-1589"> * Return true when the next encoded value in {@code src} uses BlobVar encoding, false otherwise.</span> |
| <span class="source-line-no">1590</span><span id="line-1590"> */</span> |
| <span class="source-line-no">1591</span><span id="line-1591"> public static boolean isBlobVar(PositionedByteRange src) {</span> |
| <span class="source-line-no">1592</span><span id="line-1592"> return BLOB_VAR</span> |
| <span class="source-line-no">1593</span><span id="line-1593"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1594</span><span id="line-1594"> }</span> |
| <span class="source-line-no">1595</span><span id="line-1595"></span> |
| <span class="source-line-no">1596</span><span id="line-1596"> /**</span> |
| <span class="source-line-no">1597</span><span id="line-1597"> * Return true when the next encoded value in {@code src} uses BlobCopy encoding, false otherwise.</span> |
| <span class="source-line-no">1598</span><span id="line-1598"> */</span> |
| <span class="source-line-no">1599</span><span id="line-1599"> public static boolean isBlobCopy(PositionedByteRange src) {</span> |
| <span class="source-line-no">1600</span><span id="line-1600"> return BLOB_COPY</span> |
| <span class="source-line-no">1601</span><span id="line-1601"> == (-1 == Integer.signum(src.peek()) ? DESCENDING : ASCENDING).apply(src.peek());</span> |
| <span class="source-line-no">1602</span><span id="line-1602"> }</span> |
| <span class="source-line-no">1603</span><span id="line-1603"></span> |
| <span class="source-line-no">1604</span><span id="line-1604"> /**</span> |
| <span class="source-line-no">1605</span><span id="line-1605"> * Skip {@code buff}'s position forward over one encoded value.</span> |
| <span class="source-line-no">1606</span><span id="line-1606"> * @return number of bytes skipped.</span> |
| <span class="source-line-no">1607</span><span id="line-1607"> */</span> |
| <span class="source-line-no">1608</span><span id="line-1608"> public static int skip(PositionedByteRange src) {</span> |
| <span class="source-line-no">1609</span><span id="line-1609"> final int start = src.getPosition();</span> |
| <span class="source-line-no">1610</span><span id="line-1610"> byte header = src.get();</span> |
| <span class="source-line-no">1611</span><span id="line-1611"> Order ord = (-1 == Integer.signum(header)) ? DESCENDING : ASCENDING;</span> |
| <span class="source-line-no">1612</span><span id="line-1612"> header = ord.apply(header);</span> |
| <span class="source-line-no">1613</span><span id="line-1613"></span> |
| <span class="source-line-no">1614</span><span id="line-1614"> switch (header) {</span> |
| <span class="source-line-no">1615</span><span id="line-1615"> case NULL:</span> |
| <span class="source-line-no">1616</span><span id="line-1616"> case NEG_INF:</span> |
| <span class="source-line-no">1617</span><span id="line-1617"> return 1;</span> |
| <span class="source-line-no">1618</span><span id="line-1618"> case NEG_LARGE: /* Large negative number: 0x08, ~E, ~M */</span> |
| <span class="source-line-no">1619</span><span id="line-1619"> skipVaruint64(src, DESCENDING != ord);</span> |
| <span class="source-line-no">1620</span><span id="line-1620"> skipSignificand(src, DESCENDING != ord);</span> |
| <span class="source-line-no">1621</span><span id="line-1621"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1622</span><span id="line-1622"> case NEG_MED_MIN: /* Medium negative number: 0x13-E, ~M */</span> |
| <span class="source-line-no">1623</span><span id="line-1623"> case NEG_MED_MIN + 0x01:</span> |
| <span class="source-line-no">1624</span><span id="line-1624"> case NEG_MED_MIN + 0x02:</span> |
| <span class="source-line-no">1625</span><span id="line-1625"> case NEG_MED_MIN + 0x03:</span> |
| <span class="source-line-no">1626</span><span id="line-1626"> case NEG_MED_MIN + 0x04:</span> |
| <span class="source-line-no">1627</span><span id="line-1627"> case NEG_MED_MIN + 0x05:</span> |
| <span class="source-line-no">1628</span><span id="line-1628"> case NEG_MED_MIN + 0x06:</span> |
| <span class="source-line-no">1629</span><span id="line-1629"> case NEG_MED_MIN + 0x07:</span> |
| <span class="source-line-no">1630</span><span id="line-1630"> case NEG_MED_MIN + 0x08:</span> |
| <span class="source-line-no">1631</span><span id="line-1631"> case NEG_MED_MIN + 0x09:</span> |
| <span class="source-line-no">1632</span><span id="line-1632"> case NEG_MED_MAX:</span> |
| <span class="source-line-no">1633</span><span id="line-1633"> skipSignificand(src, DESCENDING != ord);</span> |
| <span class="source-line-no">1634</span><span id="line-1634"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1635</span><span id="line-1635"> case NEG_SMALL: /* Small negative number: 0x14, -E, ~M */</span> |
| <span class="source-line-no">1636</span><span id="line-1636"> skipVaruint64(src, DESCENDING == ord);</span> |
| <span class="source-line-no">1637</span><span id="line-1637"> skipSignificand(src, DESCENDING != ord);</span> |
| <span class="source-line-no">1638</span><span id="line-1638"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1639</span><span id="line-1639"> case ZERO:</span> |
| <span class="source-line-no">1640</span><span id="line-1640"> return 1;</span> |
| <span class="source-line-no">1641</span><span id="line-1641"> case POS_SMALL: /* Small positive number: 0x16, ~-E, M */</span> |
| <span class="source-line-no">1642</span><span id="line-1642"> skipVaruint64(src, DESCENDING != ord);</span> |
| <span class="source-line-no">1643</span><span id="line-1643"> skipSignificand(src, DESCENDING == ord);</span> |
| <span class="source-line-no">1644</span><span id="line-1644"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1645</span><span id="line-1645"> case POS_MED_MIN: /* Medium positive number: 0x17+E, M */</span> |
| <span class="source-line-no">1646</span><span id="line-1646"> case POS_MED_MIN + 0x01:</span> |
| <span class="source-line-no">1647</span><span id="line-1647"> case POS_MED_MIN + 0x02:</span> |
| <span class="source-line-no">1648</span><span id="line-1648"> case POS_MED_MIN + 0x03:</span> |
| <span class="source-line-no">1649</span><span id="line-1649"> case POS_MED_MIN + 0x04:</span> |
| <span class="source-line-no">1650</span><span id="line-1650"> case POS_MED_MIN + 0x05:</span> |
| <span class="source-line-no">1651</span><span id="line-1651"> case POS_MED_MIN + 0x06:</span> |
| <span class="source-line-no">1652</span><span id="line-1652"> case POS_MED_MIN + 0x07:</span> |
| <span class="source-line-no">1653</span><span id="line-1653"> case POS_MED_MIN + 0x08:</span> |
| <span class="source-line-no">1654</span><span id="line-1654"> case POS_MED_MIN + 0x09:</span> |
| <span class="source-line-no">1655</span><span id="line-1655"> case POS_MED_MAX:</span> |
| <span class="source-line-no">1656</span><span id="line-1656"> skipSignificand(src, DESCENDING == ord);</span> |
| <span class="source-line-no">1657</span><span id="line-1657"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1658</span><span id="line-1658"> case POS_LARGE: /* Large positive number: 0x22, E, M */</span> |
| <span class="source-line-no">1659</span><span id="line-1659"> skipVaruint64(src, DESCENDING == ord);</span> |
| <span class="source-line-no">1660</span><span id="line-1660"> skipSignificand(src, DESCENDING == ord);</span> |
| <span class="source-line-no">1661</span><span id="line-1661"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1662</span><span id="line-1662"> case POS_INF:</span> |
| <span class="source-line-no">1663</span><span id="line-1663"> return 1;</span> |
| <span class="source-line-no">1664</span><span id="line-1664"> case NAN:</span> |
| <span class="source-line-no">1665</span><span id="line-1665"> return 1;</span> |
| <span class="source-line-no">1666</span><span id="line-1666"> case FIXED_INT8:</span> |
| <span class="source-line-no">1667</span><span id="line-1667"> src.setPosition(src.getPosition() + 1);</span> |
| <span class="source-line-no">1668</span><span id="line-1668"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1669</span><span id="line-1669"> case FIXED_INT16:</span> |
| <span class="source-line-no">1670</span><span id="line-1670"> src.setPosition(src.getPosition() + 2);</span> |
| <span class="source-line-no">1671</span><span id="line-1671"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1672</span><span id="line-1672"> case FIXED_INT32:</span> |
| <span class="source-line-no">1673</span><span id="line-1673"> src.setPosition(src.getPosition() + 4);</span> |
| <span class="source-line-no">1674</span><span id="line-1674"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1675</span><span id="line-1675"> case FIXED_INT64:</span> |
| <span class="source-line-no">1676</span><span id="line-1676"> src.setPosition(src.getPosition() + 8);</span> |
| <span class="source-line-no">1677</span><span id="line-1677"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1678</span><span id="line-1678"> case FIXED_FLOAT32:</span> |
| <span class="source-line-no">1679</span><span id="line-1679"> src.setPosition(src.getPosition() + 4);</span> |
| <span class="source-line-no">1680</span><span id="line-1680"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1681</span><span id="line-1681"> case FIXED_FLOAT64:</span> |
| <span class="source-line-no">1682</span><span id="line-1682"> src.setPosition(src.getPosition() + 8);</span> |
| <span class="source-line-no">1683</span><span id="line-1683"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1684</span><span id="line-1684"> case TEXT:</span> |
| <span class="source-line-no">1685</span><span id="line-1685"> // for null-terminated values, skip to the end.</span> |
| <span class="source-line-no">1686</span><span id="line-1686"> do {</span> |
| <span class="source-line-no">1687</span><span id="line-1687"> header = ord.apply(src.get());</span> |
| <span class="source-line-no">1688</span><span id="line-1688"> } while (header != TERM);</span> |
| <span class="source-line-no">1689</span><span id="line-1689"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1690</span><span id="line-1690"> case BLOB_VAR:</span> |
| <span class="source-line-no">1691</span><span id="line-1691"> // read until we find a 0 in the MSB</span> |
| <span class="source-line-no">1692</span><span id="line-1692"> do {</span> |
| <span class="source-line-no">1693</span><span id="line-1693"> header = ord.apply(src.get());</span> |
| <span class="source-line-no">1694</span><span id="line-1694"> } while ((byte) (header & 0x80) != TERM);</span> |
| <span class="source-line-no">1695</span><span id="line-1695"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1696</span><span id="line-1696"> case BLOB_COPY:</span> |
| <span class="source-line-no">1697</span><span id="line-1697"> if (Order.DESCENDING == ord) {</span> |
| <span class="source-line-no">1698</span><span id="line-1698"> // if descending, read to termination byte.</span> |
| <span class="source-line-no">1699</span><span id="line-1699"> do {</span> |
| <span class="source-line-no">1700</span><span id="line-1700"> header = ord.apply(src.get());</span> |
| <span class="source-line-no">1701</span><span id="line-1701"> } while (header != TERM);</span> |
| <span class="source-line-no">1702</span><span id="line-1702"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1703</span><span id="line-1703"> } else {</span> |
| <span class="source-line-no">1704</span><span id="line-1704"> // otherwise, just skip to the end.</span> |
| <span class="source-line-no">1705</span><span id="line-1705"> src.setPosition(src.getLength());</span> |
| <span class="source-line-no">1706</span><span id="line-1706"> return src.getPosition() - start;</span> |
| <span class="source-line-no">1707</span><span id="line-1707"> }</span> |
| <span class="source-line-no">1708</span><span id="line-1708"> default:</span> |
| <span class="source-line-no">1709</span><span id="line-1709"> throw unexpectedHeader(header);</span> |
| <span class="source-line-no">1710</span><span id="line-1710"> }</span> |
| <span class="source-line-no">1711</span><span id="line-1711"> }</span> |
| <span class="source-line-no">1712</span><span id="line-1712"></span> |
| <span class="source-line-no">1713</span><span id="line-1713"> /**</span> |
| <span class="source-line-no">1714</span><span id="line-1714"> * Return the number of encoded entries remaining in {@code buff}. The state of {@code buff} is</span> |
| <span class="source-line-no">1715</span><span id="line-1715"> * not modified through use of this method.</span> |
| <span class="source-line-no">1716</span><span id="line-1716"> */</span> |
| <span class="source-line-no">1717</span><span id="line-1717"> public static int length(PositionedByteRange buff) {</span> |
| <span class="source-line-no">1718</span><span id="line-1718"> PositionedByteRange b =</span> |
| <span class="source-line-no">1719</span><span id="line-1719"> new SimplePositionedMutableByteRange(buff.getBytes(), buff.getOffset(), buff.getLength());</span> |
| <span class="source-line-no">1720</span><span id="line-1720"> b.setPosition(buff.getPosition());</span> |
| <span class="source-line-no">1721</span><span id="line-1721"> int cnt = 0;</span> |
| <span class="source-line-no">1722</span><span id="line-1722"> for (; isEncodedValue(b); skip(b), cnt++)</span> |
| <span class="source-line-no">1723</span><span id="line-1723"> ;</span> |
| <span class="source-line-no">1724</span><span id="line-1724"> return cnt;</span> |
| <span class="source-line-no">1725</span><span id="line-1725"> }</span> |
| <span class="source-line-no">1726</span><span id="line-1726">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
