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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.io;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.OutputStream;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.nio.BufferOverflowException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.nio.ByteBuffer;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Arrays;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.util.ByteBufferUtils;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>/**<a name="line.29"></a>
<span class="sourceLineNo">030</span> * Our own implementation of ByteArrayOutputStream where all methods are NOT synchronized and<a name="line.30"></a>
<span class="sourceLineNo">031</span> * supports writing ByteBuffer directly to it.<a name="line.31"></a>
<span class="sourceLineNo">032</span> */<a name="line.32"></a>
<span class="sourceLineNo">033</span>@InterfaceAudience.Private<a name="line.33"></a>
<span class="sourceLineNo">034</span>public class ByteArrayOutputStream extends OutputStream implements ByteBufferWriter {<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span> // Borrowed from openJDK:<a name="line.36"></a>
<span class="sourceLineNo">037</span> // http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8-b132/java/util/ArrayList.java#221<a name="line.37"></a>
<span class="sourceLineNo">038</span> private static final int MAX_ARRAY_SIZE = Integer.MAX_VALUE - 8;<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> private byte[] buf;<a name="line.40"></a>
<span class="sourceLineNo">041</span> private int pos = 0;<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span> public ByteArrayOutputStream() {<a name="line.43"></a>
<span class="sourceLineNo">044</span> this(32);<a name="line.44"></a>
<span class="sourceLineNo">045</span> }<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> public ByteArrayOutputStream(int capacity) {<a name="line.47"></a>
<span class="sourceLineNo">048</span> this.buf = new byte[capacity];<a name="line.48"></a>
<span class="sourceLineNo">049</span> }<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span> @Override<a name="line.51"></a>
<span class="sourceLineNo">052</span> public void write(ByteBuffer b, int off, int len) {<a name="line.52"></a>
<span class="sourceLineNo">053</span> checkSizeAndGrow(len);<a name="line.53"></a>
<span class="sourceLineNo">054</span> ByteBufferUtils.copyFromBufferToArray(this.buf, b, off, this.pos, len);<a name="line.54"></a>
<span class="sourceLineNo">055</span> this.pos += len;<a name="line.55"></a>
<span class="sourceLineNo">056</span> }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span> @Override<a name="line.58"></a>
<span class="sourceLineNo">059</span> public void writeInt(int i) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> checkSizeAndGrow(Bytes.SIZEOF_INT);<a name="line.60"></a>
<span class="sourceLineNo">061</span> Bytes.putInt(this.buf, this.pos, i);<a name="line.61"></a>
<span class="sourceLineNo">062</span> this.pos += Bytes.SIZEOF_INT;<a name="line.62"></a>
<span class="sourceLineNo">063</span> }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span> @Override<a name="line.65"></a>
<span class="sourceLineNo">066</span> public void write(int b) {<a name="line.66"></a>
<span class="sourceLineNo">067</span> checkSizeAndGrow(Bytes.SIZEOF_BYTE);<a name="line.67"></a>
<span class="sourceLineNo">068</span> buf[this.pos] = (byte) b;<a name="line.68"></a>
<span class="sourceLineNo">069</span> this.pos++;<a name="line.69"></a>
<span class="sourceLineNo">070</span> }<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span> @Override<a name="line.72"></a>
<span class="sourceLineNo">073</span> public void write(byte[] b, int off, int len) {<a name="line.73"></a>
<span class="sourceLineNo">074</span> checkSizeAndGrow(len);<a name="line.74"></a>
<span class="sourceLineNo">075</span> System.arraycopy(b, off, this.buf, this.pos, len);<a name="line.75"></a>
<span class="sourceLineNo">076</span> this.pos += len;<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span> private void checkSizeAndGrow(int extra) {<a name="line.79"></a>
<span class="sourceLineNo">080</span> long capacityNeeded = this.pos + (long) extra;<a name="line.80"></a>
<span class="sourceLineNo">081</span> if (capacityNeeded &gt; this.buf.length) {<a name="line.81"></a>
<span class="sourceLineNo">082</span> // guarantee it's possible to fit<a name="line.82"></a>
<span class="sourceLineNo">083</span> if (capacityNeeded &gt; MAX_ARRAY_SIZE) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> throw new BufferOverflowException();<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span> // double until hit the cap<a name="line.86"></a>
<span class="sourceLineNo">087</span> long nextCapacity = Math.min(this.buf.length &lt;&lt; 1, MAX_ARRAY_SIZE);<a name="line.87"></a>
<span class="sourceLineNo">088</span> // but make sure there is enough if twice the existing capacity is still too small<a name="line.88"></a>
<span class="sourceLineNo">089</span> nextCapacity = Math.max(nextCapacity, capacityNeeded);<a name="line.89"></a>
<span class="sourceLineNo">090</span> if (nextCapacity &gt; MAX_ARRAY_SIZE) {<a name="line.90"></a>
<span class="sourceLineNo">091</span> throw new BufferOverflowException();<a name="line.91"></a>
<span class="sourceLineNo">092</span> }<a name="line.92"></a>
<span class="sourceLineNo">093</span> byte[] newBuf = new byte[(int) nextCapacity];<a name="line.93"></a>
<span class="sourceLineNo">094</span> System.arraycopy(buf, 0, newBuf, 0, buf.length);<a name="line.94"></a>
<span class="sourceLineNo">095</span> buf = newBuf;<a name="line.95"></a>
<span class="sourceLineNo">096</span> }<a name="line.96"></a>
<span class="sourceLineNo">097</span> }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span> /**<a name="line.99"></a>
<span class="sourceLineNo">100</span> * Resets the &lt;code&gt;pos&lt;/code&gt; field of this byte array output stream to zero. The output stream<a name="line.100"></a>
<span class="sourceLineNo">101</span> * can be used again.<a name="line.101"></a>
<span class="sourceLineNo">102</span> */<a name="line.102"></a>
<span class="sourceLineNo">103</span> public void reset() {<a name="line.103"></a>
<span class="sourceLineNo">104</span> this.pos = 0;<a name="line.104"></a>
<span class="sourceLineNo">105</span> }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span> /**<a name="line.107"></a>
<span class="sourceLineNo">108</span> * Copies the content of this Stream into a new byte array.<a name="line.108"></a>
<span class="sourceLineNo">109</span> * @return the contents of this output stream, as new byte array.<a name="line.109"></a>
<span class="sourceLineNo">110</span> */<a name="line.110"></a>
<span class="sourceLineNo">111</span> public byte[] toByteArray() {<a name="line.111"></a>
<span class="sourceLineNo">112</span> return Arrays.copyOf(buf, pos);<a name="line.112"></a>
<span class="sourceLineNo">113</span> }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span> public void toByteBuff(ByteBuff buff) {<a name="line.115"></a>
<span class="sourceLineNo">116</span> buff.put(buf, 0, pos);<a name="line.116"></a>
<span class="sourceLineNo">117</span> }<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span> /** Returns the underlying array where the data gets accumulated */<a name="line.119"></a>
<span class="sourceLineNo">120</span> public byte[] getBuffer() {<a name="line.120"></a>
<span class="sourceLineNo">121</span> return this.buf;<a name="line.121"></a>
<span class="sourceLineNo">122</span> }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span> /** Returns The current size of the buffer. */<a name="line.124"></a>
<span class="sourceLineNo">125</span> public int size() {<a name="line.125"></a>
<span class="sourceLineNo">126</span> return this.pos;<a name="line.126"></a>
<span class="sourceLineNo">127</span> }<a name="line.127"></a>
<span class="sourceLineNo">128</span>}<a name="line.128"></a>
</pre>
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