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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.io;</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 java.io.InputStream;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.nio.ByteBuffer;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.hbase.util.ByteBufferUtils;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">024</span><span id="line-24"></span> |
| <span class="source-line-no">025</span><span id="line-25">/**</span> |
| <span class="source-line-no">026</span><span id="line-26"> * Not thread safe!</span> |
| <span class="source-line-no">027</span><span id="line-27"> * <p></span> |
| <span class="source-line-no">028</span><span id="line-28"> * Please note that the reads will cause position movement on wrapped ByteBuffer.</span> |
| <span class="source-line-no">029</span><span id="line-29"> */</span> |
| <span class="source-line-no">030</span><span id="line-30">@InterfaceAudience.Private</span> |
| <span class="source-line-no">031</span><span id="line-31">public class ByteBufferInputStream extends InputStream {</span> |
| <span class="source-line-no">032</span><span id="line-32"></span> |
| <span class="source-line-no">033</span><span id="line-33"> private ByteBuffer buf;</span> |
| <span class="source-line-no">034</span><span id="line-34"></span> |
| <span class="source-line-no">035</span><span id="line-35"> public ByteBufferInputStream(ByteBuffer buf) {</span> |
| <span class="source-line-no">036</span><span id="line-36"> this.buf = buf;</span> |
| <span class="source-line-no">037</span><span id="line-37"> }</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> /**</span> |
| <span class="source-line-no">040</span><span id="line-40"> * Reads the next byte of data from this input stream. The value byte is returned as an</span> |
| <span class="source-line-no">041</span><span id="line-41"> * <code>int</code> in the range <code>0</code> to <code>255</code>. If no byte is available</span> |
| <span class="source-line-no">042</span><span id="line-42"> * because the end of the stream has been reached, the value <code>-1</code> is returned.</span> |
| <span class="source-line-no">043</span><span id="line-43"> * @return the next byte of data, or <code>-1</code> if the end of the stream has been reached.</span> |
| <span class="source-line-no">044</span><span id="line-44"> */</span> |
| <span class="source-line-no">045</span><span id="line-45"> @Override</span> |
| <span class="source-line-no">046</span><span id="line-46"> public int read() {</span> |
| <span class="source-line-no">047</span><span id="line-47"> if (this.buf.hasRemaining()) {</span> |
| <span class="source-line-no">048</span><span id="line-48"> return (this.buf.get() & 0xff);</span> |
| <span class="source-line-no">049</span><span id="line-49"> }</span> |
| <span class="source-line-no">050</span><span id="line-50"> return -1;</span> |
| <span class="source-line-no">051</span><span id="line-51"> }</span> |
| <span class="source-line-no">052</span><span id="line-52"></span> |
| <span class="source-line-no">053</span><span id="line-53"> /**</span> |
| <span class="source-line-no">054</span><span id="line-54"> * Reads up to next <code>len</code> bytes of data from buffer into passed array(starting from</span> |
| <span class="source-line-no">055</span><span id="line-55"> * given offset).</span> |
| <span class="source-line-no">056</span><span id="line-56"> * @param b the array into which the data is read.</span> |
| <span class="source-line-no">057</span><span id="line-57"> * @param off the start offset in the destination array <code>b</code></span> |
| <span class="source-line-no">058</span><span id="line-58"> * @param len the maximum number of bytes to read.</span> |
| <span class="source-line-no">059</span><span id="line-59"> * @return the total number of bytes actually read into the buffer, or <code>-1</code> if not even</span> |
| <span class="source-line-no">060</span><span id="line-60"> * 1 byte can be read because the end of the stream has been reached.</span> |
| <span class="source-line-no">061</span><span id="line-61"> */</span> |
| <span class="source-line-no">062</span><span id="line-62"> @Override</span> |
| <span class="source-line-no">063</span><span id="line-63"> public int read(byte[] b, int off, int len) {</span> |
| <span class="source-line-no">064</span><span id="line-64"> int avail = available();</span> |
| <span class="source-line-no">065</span><span id="line-65"> if (avail <= 0) {</span> |
| <span class="source-line-no">066</span><span id="line-66"> return -1;</span> |
| <span class="source-line-no">067</span><span id="line-67"> }</span> |
| <span class="source-line-no">068</span><span id="line-68"></span> |
| <span class="source-line-no">069</span><span id="line-69"> if (len > avail) {</span> |
| <span class="source-line-no">070</span><span id="line-70"> len = avail;</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"> if (len <= 0) {</span> |
| <span class="source-line-no">073</span><span id="line-73"> return 0;</span> |
| <span class="source-line-no">074</span><span id="line-74"> }</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> ByteBufferUtils.copyFromBufferToArray(b, this.buf, this.buf.position(), off, len);</span> |
| <span class="source-line-no">077</span><span id="line-77"> this.buf.position(this.buf.position() + len); // we should advance the buffer position</span> |
| <span class="source-line-no">078</span><span id="line-78"> return len;</span> |
| <span class="source-line-no">079</span><span id="line-79"> }</span> |
| <span class="source-line-no">080</span><span id="line-80"></span> |
| <span class="source-line-no">081</span><span id="line-81"> /**</span> |
| <span class="source-line-no">082</span><span id="line-82"> * Skips <code>n</code> bytes of input from this input stream. Fewer bytes might be skipped if the</span> |
| <span class="source-line-no">083</span><span id="line-83"> * end of the input stream is reached. The actual number <code>k</code> of bytes to be skipped is</span> |
| <span class="source-line-no">084</span><span id="line-84"> * equal to the smaller of <code>n</code> and remaining bytes in the stream.</span> |
| <span class="source-line-no">085</span><span id="line-85"> * @param n the number of bytes to be skipped.</span> |
| <span class="source-line-no">086</span><span id="line-86"> * @return the actual number of bytes skipped.</span> |
| <span class="source-line-no">087</span><span id="line-87"> */</span> |
| <span class="source-line-no">088</span><span id="line-88"> @Override</span> |
| <span class="source-line-no">089</span><span id="line-89"> public long skip(long n) {</span> |
| <span class="source-line-no">090</span><span id="line-90"> long k = Math.min(n, available());</span> |
| <span class="source-line-no">091</span><span id="line-91"> if (k < 0) {</span> |
| <span class="source-line-no">092</span><span id="line-92"> k = 0;</span> |
| <span class="source-line-no">093</span><span id="line-93"> }</span> |
| <span class="source-line-no">094</span><span id="line-94"> this.buf.position((int) (this.buf.position() + k));</span> |
| <span class="source-line-no">095</span><span id="line-95"> return k;</span> |
| <span class="source-line-no">096</span><span id="line-96"> }</span> |
| <span class="source-line-no">097</span><span id="line-97"></span> |
| <span class="source-line-no">098</span><span id="line-98"> /**</span> |
| <span class="source-line-no">099</span><span id="line-99"> * @return the number of remaining bytes that can be read (or skipped over) from this input</span> |
| <span class="source-line-no">100</span><span id="line-100"> * stream.</span> |
| <span class="source-line-no">101</span><span id="line-101"> */</span> |
| <span class="source-line-no">102</span><span id="line-102"> @Override</span> |
| <span class="source-line-no">103</span><span id="line-103"> public int available() {</span> |
| <span class="source-line-no">104</span><span id="line-104"> return this.buf.remaining();</span> |
| <span class="source-line-no">105</span><span id="line-105"> }</span> |
| <span class="source-line-no">106</span><span id="line-106">}</span> |
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| </pre> |
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