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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.InputStream;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.nio.ByteBuffer;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.hadoop.hbase.util.ByteBufferUtils;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span><a name="line.24"></a> |
| <span class="sourceLineNo">025</span>/**<a name="line.25"></a> |
| <span class="sourceLineNo">026</span> * Not thread safe!<a name="line.26"></a> |
| <span class="sourceLineNo">027</span> * <p><a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * Please note that the reads will cause position movement on wrapped ByteBuffer.<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> */<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>@InterfaceAudience.Private<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>public class ByteBufferInputStream extends InputStream {<a name="line.31"></a> |
| <span class="sourceLineNo">032</span><a name="line.32"></a> |
| <span class="sourceLineNo">033</span> private ByteBuffer buf;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span><a name="line.34"></a> |
| <span class="sourceLineNo">035</span> public ByteBufferInputStream(ByteBuffer buf) {<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> this.buf = buf;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> }<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> /**<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * Reads the next byte of data from this input stream. The value byte is returned as an<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * <code>int</code> in the range <code>0</code> to <code>255</code>. If no byte is available<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * because the end of the stream has been reached, the value <code>-1</code> is returned.<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * @return the next byte of data, or <code>-1</code> if the end of the stream has been reached.<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> */<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> @Override<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> public int read() {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> if (this.buf.hasRemaining()) {<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> return (this.buf.get() & 0xff);<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> }<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> return -1;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> }<a name="line.51"></a> |
| <span class="sourceLineNo">052</span><a name="line.52"></a> |
| <span class="sourceLineNo">053</span> /**<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * Reads up to next <code>len</code> bytes of data from buffer into passed array(starting from<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * given offset).<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * @param b the array into which the data is read.<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> * @param off the start offset in the destination array <code>b</code><a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * @param len the maximum number of bytes to read.<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * @return the total number of bytes actually read into the buffer, or <code>-1</code> if not even<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * 1 byte can be read because the end of the stream has been reached.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> */<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> @Override<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> public int read(byte[] b, int off, int len) {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> int avail = available();<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> if (avail <= 0) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> return -1;<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> if (len > avail) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> len = avail;<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> }<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> if (len <= 0) {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> return 0;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span><a name="line.75"></a> |
| <span class="sourceLineNo">076</span> ByteBufferUtils.copyFromBufferToArray(b, this.buf, this.buf.position(), off, len);<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> this.buf.position(this.buf.position() + len); // we should advance the buffer position<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> return len;<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> }<a name="line.79"></a> |
| <span class="sourceLineNo">080</span><a name="line.80"></a> |
| <span class="sourceLineNo">081</span> /**<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * Skips <code>n</code> bytes of input from this input stream. Fewer bytes might be skipped if the<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * end of the input stream is reached. The actual number <code>k</code> of bytes to be skipped is<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> * equal to the smaller of <code>n</code> and remaining bytes in the stream.<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> * @param n the number of bytes to be skipped.<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> * @return the actual number of bytes skipped.<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> */<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> @Override<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> public long skip(long n) {<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> long k = Math.min(n, available());<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> if (k < 0) {<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> k = 0;<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> }<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> this.buf.position((int) (this.buf.position() + k));<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> return k;<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> * @return the number of remaining bytes that can be read (or skipped over) from this input<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> * stream.<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> */<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> @Override<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> public int available() {<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> return this.buf.remaining();<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> |
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