| Clover coverage report - DrJava Test Coverage (drjava-20120422-r5456) |
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| Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
| JoinInputStream.java | 0% | 0% | 0% | 0% |
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| 1 | /*BEGIN_COPYRIGHT_BLOCK | |
| 2 | * | |
| 3 | * Copyright (c) 2001-2010, JavaPLT group at Rice University (drjava@rice.edu) | |
| 4 | * All rights reserved. | |
| 5 | * | |
| 6 | * Redistribution and use in source and binary forms, with or without | |
| 7 | * modification, are permitted provided that the following conditions are met: | |
| 8 | * * Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * * Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * * Neither the names of DrJava, the JavaPLT group, Rice University, nor the | |
| 14 | * names of its contributors may be used to endorse or promote products | |
| 15 | * derived from this software without specific prior written permission. | |
| 16 | * | |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 18 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 19 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 20 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
| 21 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 22 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 23 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 24 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
| 25 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
| 26 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
| 27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 28 | * | |
| 29 | * This software is Open Source Initiative approved Open Source Software. | |
| 30 | * Open Source Initative Approved is a trademark of the Open Source Initiative. | |
| 31 | * | |
| 32 | * This file is part of DrJava. Download the current version of this project | |
| 33 | * from http://www.drjava.org/ or http://sourceforge.net/projects/drjava/ | |
| 34 | * | |
| 35 | * END_COPYRIGHT_BLOCK*/ | |
| 36 | ||
| 37 | // based on: | |
| 38 | //-< JoinInputStream.java >------------------------------------------*--------* | |
| 39 | // JSYNC Version 1.04 (c) 1998 GARRET * ? * | |
| 40 | // (Java synchronization classes) * /\| * | |
| 41 | // * / \ * | |
| 42 | // Created: 20-Jun-98 K.A. Knizhnik * / [] \ * | |
| 43 | // Last update: 10-Jul-98 K.A. Knizhnik * GARRET * | |
| 44 | //-------------------------------------------------------------------*--------* | |
| 45 | // Mutiplexing input from several threads. | |
| 46 | //-------------------------------------------------------------------*--------* | |
| 47 | ||
| 48 | package edu.rice.cs.util; | |
| 49 | ||
| 50 | import java.io.*; | |
| 51 | ||
| 52 | public class JoinInputStream extends InputStream { | |
| 53 | /** Create stream joining streams specified in the array. | |
| 54 | * | |
| 55 | * @param streams array with input streams which should be joined | |
| 56 | * @param bufferSize specifies size of read buffer | |
| 57 | */ | |
| 58 | 0 | public JoinInputStream(InputStream[] streams, int bufferSize) { |
| 59 | 0 | openedStreams = nReaders = streams.length; |
| 60 | 0 | reader = new ReaderThread[nReaders]; |
| 61 | 0 | for (int i = 0; i < nReaders; i++) { |
| 62 | 0 | reader[i] = new ReaderThread(this, streams[i], bufferSize); |
| 63 | 0 | reader[i].start(); |
| 64 | } | |
| 65 | 0 | currentReader = 0; |
| 66 | } | |
| 67 | ||
| 68 | /** Create stream joining two specified streams. | |
| 69 | * | |
| 70 | * @param one first input stream to be merged | |
| 71 | * @param two second input stream to be merged | |
| 72 | * @param bufferSize specifies size of read buffer | |
| 73 | */ | |
| 74 | 0 | public JoinInputStream(InputStream one, InputStream two, int bufferSize) { |
| 75 | 0 | this(new InputStream[] { one, two}, bufferSize); |
| 76 | } | |
| 77 | ||
| 78 | /** Create stream joining two specified streams. | |
| 79 | * | |
| 80 | * @param one first input stream to be merged | |
| 81 | * @param two second input stream to be merged | |
| 82 | */ | |
| 83 | 0 | public JoinInputStream(InputStream one, InputStream two) { |
| 84 | 0 | this(one, two, defaultBufferSize); |
| 85 | } | |
| 86 | ||
| 87 | /** Reads the next byte of data from one of input streams. The value | |
| 88 | * byte is returned as an <code>int</code> in the range | |
| 89 | * <code > 0</code> to <code>255</code>. If no byte is available | |
| 90 | * because the end of the stream has been reached, the value | |
| 91 | * <code>-1</code> is returned. This method blocks until input data | |
| 92 | * is available, the end of the stream is detected or an exception | |
| 93 | * is catched.<p> | |
| 94 | * | |
| 95 | * @return the next byte of data, or <code>-1</code> if the end of the | |
| 96 | * stream is reached. | |
| 97 | * @exception IOException if an I/O error occurs. | |
| 98 | */ | |
| 99 | 0 | public synchronized int read() throws IOException { |
| 100 | 0 | while (openedStreams != 0) { |
| 101 | 0 | for (int i = 0; i < nReaders; i++) { |
| 102 | 0 | ReaderThread rd = reader[currentReader]; |
| 103 | 0 | if (rd.available > 0) { |
| 104 | 0 | return rd.read(); |
| 105 | } | |
| 106 | 0 | currentReader += 1; |
| 107 | 0 | if (currentReader == nReaders) { |
| 108 | 0 | currentReader = 0; |
| 109 | } | |
| 110 | } | |
| 111 | 0 | try { |
| 112 | 0 | wait(); |
| 113 | } catch(InterruptedException ex) { | |
| 114 | 0 | break; |
| 115 | } | |
| 116 | } | |
| 117 | 0 | return -1; |
| 118 | } | |
| 119 | ||
| 120 | /** | |
| 121 | * Reads up to <code>len</code> bytes of data from one of input streams | |
| 122 | * into an array of bytes. This method blocks until some input is | |
| 123 | * available. If the first argument is <code>null,</code> up to | |
| 124 | * <code>len</code> bytes are read and discarded. | |
| 125 | * <p> | |
| 126 | * The <code>read</code> method of <code>InputStream</code> reads a | |
| 127 | * single byte at a time using the read method of zero arguments to | |
| 128 | * fill in the array. Subclasses are encouraged to provide a more | |
| 129 | * efficient implementation of this method. | |
| 130 | * | |
| 131 | * @param b the buffer into which the data is read. | |
| 132 | * @param off the start offset of the data. | |
| 133 | * @param len the maximum number of bytes read. | |
| 134 | * @return the total number of bytes read into the buffer, or | |
| 135 | * <code>-1</code> if there is no more data because the end of | |
| 136 | * the stream has been reached. | |
| 137 | * @exception IOException if an I/O error occurs. | |
| 138 | */ | |
| 139 | 0 | public synchronized int read(byte b[], int off, int len) throws IOException { |
| 140 | 0 | while (openedStreams != 0) { |
| 141 | 0 | for (int i = 0; i < nReaders; i++) { |
| 142 | 0 | ReaderThread rd = reader[currentReader]; |
| 143 | 0 | if (rd.available > 0) { |
| 144 | 0 | return rd.read(b, off, len); |
| 145 | } | |
| 146 | 0 | currentReader += 1; |
| 147 | 0 | if (currentReader == nReaders) { |
| 148 | 0 | currentReader = 0; |
| 149 | } | |
| 150 | } | |
| 151 | 0 | try { |
| 152 | 0 | wait(); |
| 153 | } catch(InterruptedException ex) { | |
| 154 | 0 | break; |
| 155 | } | |
| 156 | } | |
| 157 | 0 | return -1; |
| 158 | } | |
| 159 | ||
| 160 | /** Close all attached input streams and stop their listener threads. */ | |
| 161 | 0 | public void close() throws IOException { |
| 162 | 0 | for (int i = 0; i < nReaders; i++) { |
| 163 | 0 | if (reader[i].available >= 0) { |
| 164 | 0 | reader[i].close(); |
| 165 | } | |
| 166 | } | |
| 167 | } | |
| 168 | ||
| 169 | /** Get index of thread from which data was retrieved in last | |
| 170 | * <code>read</code> operation. Indices are started from 0. | |
| 171 | * | |
| 172 | * @return index of thread from which data was taken in last | |
| 173 | * <code>read</code> operation. | |
| 174 | */ | |
| 175 | 0 | public final int getStreamIndex() { |
| 176 | 0 | return currentReader; |
| 177 | } | |
| 178 | ||
| 179 | /** Default size of read buffer. | |
| 180 | */ | |
| 181 | static public int defaultBufferSize = 4096; | |
| 182 | ||
| 183 | protected int nReaders; | |
| 184 | protected ReaderThread[] reader; | |
| 185 | protected int currentReader; | |
| 186 | protected int openedStreams; | |
| 187 | } | |
| 188 | ||
| 189 | class ReaderThread extends Thread { | |
| 190 | volatile int available; | |
| 191 | volatile int pos; | |
| 192 | volatile byte[] buffer; | |
| 193 | volatile InputStream stream; | |
| 194 | volatile IOException exception; | |
| 195 | volatile JoinInputStream monitor; | |
| 196 | ||
| 197 | 0 | ReaderThread(JoinInputStream monitor, InputStream stream, int bufferSize) { |
| 198 | 0 | this.stream = stream; |
| 199 | 0 | this.monitor = monitor; |
| 200 | 0 | buffer = new byte[bufferSize]; |
| 201 | 0 | available = 0; |
| 202 | 0 | pos = 0; |
| 203 | 0 | exception = null; |
| 204 | } | |
| 205 | ||
| 206 | 0 | public synchronized void run() { |
| 207 | 0 | while (true) { |
| 208 | 0 | int len; |
| 209 | 0 | try { |
| 210 | 0 | len = stream.read(buffer); |
| 211 | } catch(IOException ex) { | |
| 212 | 0 | exception = ex; |
| 213 | 0 | len = -1; |
| 214 | } | |
| 215 | 0 | synchronized(monitor) { |
| 216 | 0 | available = len; |
| 217 | 0 | pos = 0; |
| 218 | 0 | monitor.notify(); |
| 219 | 0 | if (len < 0) { |
| 220 | 0 | try { |
| 221 | 0 | stream.close(); |
| 222 | } catch(IOException ex) {} | |
| 223 | 0 | monitor.openedStreams -= 1; |
| 224 | 0 | return; |
| 225 | } | |
| 226 | } | |
| 227 | 0 | do { |
| 228 | 0 | try { |
| 229 | 0 | wait(); |
| 230 | } catch(InterruptedException ex) { | |
| 231 | 0 | return; |
| 232 | } | |
| 233 | 0 | } while(available != 0); // preclude spurious wakeups |
| 234 | } | |
| 235 | } | |
| 236 | ||
| 237 | 0 | synchronized int read() throws IOException { |
| 238 | 0 | if (exception != null) { |
| 239 | 0 | throw exception; |
| 240 | } | |
| 241 | 0 | int ch = buffer[pos] & 0xFF; |
| 242 | 0 | if (++pos == available) { |
| 243 | 0 | available = 0; |
| 244 | 0 | notify(); |
| 245 | } | |
| 246 | 0 | return ch; |
| 247 | } | |
| 248 | ||
| 249 | 0 | synchronized int read(byte[] b, int off, int len) throws IOException { |
| 250 | 0 | if (exception != null) { |
| 251 | 0 | throw exception; |
| 252 | } | |
| 253 | 0 | if (available - pos <= len) { |
| 254 | 0 | len = available - pos; |
| 255 | 0 | available = 0; |
| 256 | 0 | notify(); |
| 257 | } | |
| 258 | 0 | System.arraycopy(buffer, pos, b, off, len); |
| 259 | 0 | pos += len; |
| 260 | 0 | return len; |
| 261 | } | |
| 262 | ||
| 263 | 0 | void close() throws IOException { |
| 264 | //stop(); | |
| 265 | 0 | interrupt(); |
| 266 | 0 | stream.close(); |
| 267 | } | |
| 268 | } |
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