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annotate src/org/tmatesoft/hg/internal/ByteArrayChannel.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents e1b29756f901
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rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.nio.ByteBuffer;
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20 import java.util.LinkedList;
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21 import java.util.List;
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22
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23 import org.tmatesoft.hg.util.ByteChannel;
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24
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25 /**
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26 * {@link ByteChannel} implementation that serializes data into a byte array
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class ByteArrayChannel implements ByteChannel {
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32 private final List<ByteBuffer> buffers;
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33 private ByteBuffer target;
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34 private byte[] result;
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35
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36 public ByteArrayChannel() {
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37 this(-1);
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38 }
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39
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40 public ByteArrayChannel(int size) {
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41 if (size == -1) {
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42 buffers = new LinkedList<ByteBuffer>();
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43 } else {
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44 if (size < 0) {
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45 throw new IllegalArgumentException(String.valueOf(size));
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46 }
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47 buffers = null;
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48 target = ByteBuffer.allocate(size);
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49 }
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50 }
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51
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52 /*
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53 * {@link #toArray()} calls do not clear data collected so far, subsequent {@link #write(ByteBuffer)}
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54 * augment collected content.
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55 */
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56 public int write(ByteBuffer buffer) {
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57 int rv = buffer.remaining();
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58 if (buffers == null) {
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59 target.put(buffer);
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60 } else {
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61 ByteBuffer copy = ByteBuffer.allocate(rv);
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62 copy.put(buffer);
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63 buffers.add(copy);
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64 }
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65 result = null;
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66 return rv;
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67 }
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69 /**
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70 * @return content accumulated so far
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71 */
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72 public byte[] toArray() {
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73 if (result != null) {
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74 return result;
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75 }
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76 if (buffers == null) {
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77 assert target.hasArray();
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78 // int total = target.position();
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79 // System.arraycopy(target.array(), new byte[total]);
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80 // I don't want to duplicate byte[] for now
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81 // although correct way of doing things is to make a copy and discard target
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82 return target.array();
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83 } else {
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84 int total = 0;
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85 for (ByteBuffer bb : buffers) {
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86 bb.flip();
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87 total += bb.limit();
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88 }
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89 result = new byte[total];
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90 int off = 0;
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91 for (ByteBuffer bb : buffers) {
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92 bb.get(result, off, bb.limit());
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93 off += bb.limit();
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94 }
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95 return result;
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96 }
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97 }
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98 }