Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/ByteArrayChannel.java @ 690:b286222158be
Fix file.isCopy() use for status and cat commands
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 01 Aug 2013 21:45:47 +0200 (2013-08-01) |
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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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68 |
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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 } |