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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> *<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a>
<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a>
<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a>
<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a>
<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a>
<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a>
<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
<span class="sourceLineNo">012</span> *<a name="line.12"></a>
<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a>
<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a>
<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a>
<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a>
<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>package org.apache.hadoop.hbase.rest;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Iterator;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.Cell;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.TableNotEnabledException;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.TableNotFoundException;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.UnknownScannerException;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.client.Result;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.client.ResultScanner;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.client.Table;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.filter.Filter;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.rest.model.ScannerModel;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.security.visibility.Authorizations;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.apache.hadoop.util.StringUtils;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.slf4j.Logger;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.slf4j.LoggerFactory;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>@InterfaceAudience.Private<a name="line.42"></a>
<span class="sourceLineNo">043</span>public class ScannerResultGenerator extends ResultGenerator {<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span> private static final Logger LOG =<a name="line.45"></a>
<span class="sourceLineNo">046</span> LoggerFactory.getLogger(ScannerResultGenerator.class);<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> public static Filter buildFilterFromModel(final ScannerModel model) <a name="line.48"></a>
<span class="sourceLineNo">049</span> throws Exception {<a name="line.49"></a>
<span class="sourceLineNo">050</span> String filter = model.getFilter();<a name="line.50"></a>
<span class="sourceLineNo">051</span> if (filter == null || filter.length() == 0) {<a name="line.51"></a>
<span class="sourceLineNo">052</span> return null;<a name="line.52"></a>
<span class="sourceLineNo">053</span> }<a name="line.53"></a>
<span class="sourceLineNo">054</span> return buildFilter(filter);<a name="line.54"></a>
<span class="sourceLineNo">055</span> }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span> private String id;<a name="line.57"></a>
<span class="sourceLineNo">058</span> private Iterator&lt;Cell&gt; rowI;<a name="line.58"></a>
<span class="sourceLineNo">059</span> private Cell cache;<a name="line.59"></a>
<span class="sourceLineNo">060</span> private ResultScanner scanner;<a name="line.60"></a>
<span class="sourceLineNo">061</span> private Result cached;<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span> public ScannerResultGenerator(final String tableName, final RowSpec rowspec,<a name="line.63"></a>
<span class="sourceLineNo">064</span> final Filter filter, final boolean cacheBlocks)<a name="line.64"></a>
<span class="sourceLineNo">065</span> throws IllegalArgumentException, IOException {<a name="line.65"></a>
<span class="sourceLineNo">066</span> this(tableName, rowspec, filter, -1, cacheBlocks);<a name="line.66"></a>
<span class="sourceLineNo">067</span> }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span> public ScannerResultGenerator(final String tableName, final RowSpec rowspec,<a name="line.69"></a>
<span class="sourceLineNo">070</span> final Filter filter, final int caching, final boolean cacheBlocks)<a name="line.70"></a>
<span class="sourceLineNo">071</span> throws IllegalArgumentException, IOException {<a name="line.71"></a>
<span class="sourceLineNo">072</span> Table table = RESTServlet.getInstance().getTable(tableName);<a name="line.72"></a>
<span class="sourceLineNo">073</span> try {<a name="line.73"></a>
<span class="sourceLineNo">074</span> Scan scan;<a name="line.74"></a>
<span class="sourceLineNo">075</span> if (rowspec.hasEndRow()) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> scan = new Scan(rowspec.getStartRow(), rowspec.getEndRow());<a name="line.76"></a>
<span class="sourceLineNo">077</span> } else {<a name="line.77"></a>
<span class="sourceLineNo">078</span> scan = new Scan(rowspec.getStartRow());<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span> if (rowspec.hasColumns()) {<a name="line.80"></a>
<span class="sourceLineNo">081</span> byte[][] columns = rowspec.getColumns();<a name="line.81"></a>
<span class="sourceLineNo">082</span> for (byte[] column: columns) {<a name="line.82"></a>
<span class="sourceLineNo">083</span> byte[][] split = CellUtil.parseColumn(column);<a name="line.83"></a>
<span class="sourceLineNo">084</span> if (split.length == 1) {<a name="line.84"></a>
<span class="sourceLineNo">085</span> scan.addFamily(split[0]);<a name="line.85"></a>
<span class="sourceLineNo">086</span> } else if (split.length == 2) {<a name="line.86"></a>
<span class="sourceLineNo">087</span> scan.addColumn(split[0], split[1]);<a name="line.87"></a>
<span class="sourceLineNo">088</span> } else {<a name="line.88"></a>
<span class="sourceLineNo">089</span> throw new IllegalArgumentException("Invalid familyAndQualifier provided.");<a name="line.89"></a>
<span class="sourceLineNo">090</span> }<a name="line.90"></a>
<span class="sourceLineNo">091</span> }<a name="line.91"></a>
<span class="sourceLineNo">092</span> }<a name="line.92"></a>
<span class="sourceLineNo">093</span> scan.setTimeRange(rowspec.getStartTime(), rowspec.getEndTime()); <a name="line.93"></a>
<span class="sourceLineNo">094</span> scan.setMaxVersions(rowspec.getMaxVersions());<a name="line.94"></a>
<span class="sourceLineNo">095</span> if (filter != null) {<a name="line.95"></a>
<span class="sourceLineNo">096</span> scan.setFilter(filter);<a name="line.96"></a>
<span class="sourceLineNo">097</span> }<a name="line.97"></a>
<span class="sourceLineNo">098</span> if (caching &gt; 0 ) {<a name="line.98"></a>
<span class="sourceLineNo">099</span> scan.setCaching(caching);<a name="line.99"></a>
<span class="sourceLineNo">100</span> }<a name="line.100"></a>
<span class="sourceLineNo">101</span> scan.setCacheBlocks(cacheBlocks);<a name="line.101"></a>
<span class="sourceLineNo">102</span> if (rowspec.hasLabels()) {<a name="line.102"></a>
<span class="sourceLineNo">103</span> scan.setAuthorizations(new Authorizations(rowspec.getLabels()));<a name="line.103"></a>
<span class="sourceLineNo">104</span> }<a name="line.104"></a>
<span class="sourceLineNo">105</span> scanner = table.getScanner(scan);<a name="line.105"></a>
<span class="sourceLineNo">106</span> cached = null;<a name="line.106"></a>
<span class="sourceLineNo">107</span> id = Long.toString(System.currentTimeMillis()) +<a name="line.107"></a>
<span class="sourceLineNo">108</span> Integer.toHexString(scanner.hashCode());<a name="line.108"></a>
<span class="sourceLineNo">109</span> } finally {<a name="line.109"></a>
<span class="sourceLineNo">110</span> table.close();<a name="line.110"></a>
<span class="sourceLineNo">111</span> }<a name="line.111"></a>
<span class="sourceLineNo">112</span> }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span> public String getID() {<a name="line.114"></a>
<span class="sourceLineNo">115</span> return id;<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span> @Override<a name="line.118"></a>
<span class="sourceLineNo">119</span> public void close() {<a name="line.119"></a>
<span class="sourceLineNo">120</span> if (scanner != null) {<a name="line.120"></a>
<span class="sourceLineNo">121</span> scanner.close();<a name="line.121"></a>
<span class="sourceLineNo">122</span> scanner = null;<a name="line.122"></a>
<span class="sourceLineNo">123</span> }<a name="line.123"></a>
<span class="sourceLineNo">124</span> }<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span> @Override<a name="line.126"></a>
<span class="sourceLineNo">127</span> public boolean hasNext() {<a name="line.127"></a>
<span class="sourceLineNo">128</span> if (cache != null) {<a name="line.128"></a>
<span class="sourceLineNo">129</span> return true;<a name="line.129"></a>
<span class="sourceLineNo">130</span> }<a name="line.130"></a>
<span class="sourceLineNo">131</span> if (rowI != null &amp;&amp; rowI.hasNext()) {<a name="line.131"></a>
<span class="sourceLineNo">132</span> return true;<a name="line.132"></a>
<span class="sourceLineNo">133</span> }<a name="line.133"></a>
<span class="sourceLineNo">134</span> if (cached != null) {<a name="line.134"></a>
<span class="sourceLineNo">135</span> return true;<a name="line.135"></a>
<span class="sourceLineNo">136</span> }<a name="line.136"></a>
<span class="sourceLineNo">137</span> try {<a name="line.137"></a>
<span class="sourceLineNo">138</span> Result result = scanner.next();<a name="line.138"></a>
<span class="sourceLineNo">139</span> if (result != null &amp;&amp; !result.isEmpty()) {<a name="line.139"></a>
<span class="sourceLineNo">140</span> cached = result;<a name="line.140"></a>
<span class="sourceLineNo">141</span> }<a name="line.141"></a>
<span class="sourceLineNo">142</span> } catch (UnknownScannerException e) {<a name="line.142"></a>
<span class="sourceLineNo">143</span> throw new IllegalArgumentException(e);<a name="line.143"></a>
<span class="sourceLineNo">144</span> } catch (IOException e) {<a name="line.144"></a>
<span class="sourceLineNo">145</span> LOG.error(StringUtils.stringifyException(e));<a name="line.145"></a>
<span class="sourceLineNo">146</span> }<a name="line.146"></a>
<span class="sourceLineNo">147</span> return cached != null;<a name="line.147"></a>
<span class="sourceLineNo">148</span> }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span> @Override<a name="line.150"></a>
<span class="sourceLineNo">151</span> public Cell next() {<a name="line.151"></a>
<span class="sourceLineNo">152</span> if (cache != null) {<a name="line.152"></a>
<span class="sourceLineNo">153</span> Cell kv = cache;<a name="line.153"></a>
<span class="sourceLineNo">154</span> cache = null;<a name="line.154"></a>
<span class="sourceLineNo">155</span> return kv;<a name="line.155"></a>
<span class="sourceLineNo">156</span> }<a name="line.156"></a>
<span class="sourceLineNo">157</span> boolean loop;<a name="line.157"></a>
<span class="sourceLineNo">158</span> do {<a name="line.158"></a>
<span class="sourceLineNo">159</span> loop = false;<a name="line.159"></a>
<span class="sourceLineNo">160</span> if (rowI != null) {<a name="line.160"></a>
<span class="sourceLineNo">161</span> if (rowI.hasNext()) {<a name="line.161"></a>
<span class="sourceLineNo">162</span> return rowI.next();<a name="line.162"></a>
<span class="sourceLineNo">163</span> } else {<a name="line.163"></a>
<span class="sourceLineNo">164</span> rowI = null;<a name="line.164"></a>
<span class="sourceLineNo">165</span> }<a name="line.165"></a>
<span class="sourceLineNo">166</span> }<a name="line.166"></a>
<span class="sourceLineNo">167</span> if (cached != null) {<a name="line.167"></a>
<span class="sourceLineNo">168</span> rowI = cached.listCells().iterator();<a name="line.168"></a>
<span class="sourceLineNo">169</span> loop = true;<a name="line.169"></a>
<span class="sourceLineNo">170</span> cached = null;<a name="line.170"></a>
<span class="sourceLineNo">171</span> } else {<a name="line.171"></a>
<span class="sourceLineNo">172</span> Result result = null;<a name="line.172"></a>
<span class="sourceLineNo">173</span> try {<a name="line.173"></a>
<span class="sourceLineNo">174</span> result = scanner.next();<a name="line.174"></a>
<span class="sourceLineNo">175</span> } catch (UnknownScannerException e) {<a name="line.175"></a>
<span class="sourceLineNo">176</span> throw new IllegalArgumentException(e);<a name="line.176"></a>
<span class="sourceLineNo">177</span> } catch (TableNotEnabledException tnee) {<a name="line.177"></a>
<span class="sourceLineNo">178</span> throw new IllegalStateException(tnee);<a name="line.178"></a>
<span class="sourceLineNo">179</span> } catch (TableNotFoundException tnfe) {<a name="line.179"></a>
<span class="sourceLineNo">180</span> throw new IllegalArgumentException(tnfe);<a name="line.180"></a>
<span class="sourceLineNo">181</span> } catch (IOException e) {<a name="line.181"></a>
<span class="sourceLineNo">182</span> LOG.error(StringUtils.stringifyException(e));<a name="line.182"></a>
<span class="sourceLineNo">183</span> }<a name="line.183"></a>
<span class="sourceLineNo">184</span> if (result != null &amp;&amp; !result.isEmpty()) {<a name="line.184"></a>
<span class="sourceLineNo">185</span> rowI = result.listCells().iterator();<a name="line.185"></a>
<span class="sourceLineNo">186</span> loop = true;<a name="line.186"></a>
<span class="sourceLineNo">187</span> }<a name="line.187"></a>
<span class="sourceLineNo">188</span> }<a name="line.188"></a>
<span class="sourceLineNo">189</span> } while (loop);<a name="line.189"></a>
<span class="sourceLineNo">190</span> return null;<a name="line.190"></a>
<span class="sourceLineNo">191</span> }<a name="line.191"></a>
<span class="sourceLineNo">192</span><a name="line.192"></a>
<span class="sourceLineNo">193</span> @Override<a name="line.193"></a>
<span class="sourceLineNo">194</span> public void putBack(Cell kv) {<a name="line.194"></a>
<span class="sourceLineNo">195</span> this.cache = kv;<a name="line.195"></a>
<span class="sourceLineNo">196</span> }<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span> @Override<a name="line.198"></a>
<span class="sourceLineNo">199</span> public void remove() {<a name="line.199"></a>
<span class="sourceLineNo">200</span> throw new UnsupportedOperationException("remove not supported");<a name="line.200"></a>
<span class="sourceLineNo">201</span> }<a name="line.201"></a>
<span class="sourceLineNo">202</span>}<a name="line.202"></a>
</pre>
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