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annotate src/org/tmatesoft/hg/internal/ByteArrayChannel.java @ 176:a8df7162ec75

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Extracting complete branch using remote between call to detect incoming changes is done. Arguments reorderd in remote repo to better match Hg server ideology, not my mental convenience
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 03:01:14 +0200
parents 1a7a9a20e1f9
children e1b29756f901
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1 /*
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2 * Copyright (c) 2011 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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7567f4a42fe5 Correct contact address
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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 *
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 public class ByteArrayChannel implements ByteChannel {
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31 private final List<ByteBuffer> buffers;
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32 private ByteBuffer target;
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33 private byte[] result;
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34
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35 public ByteArrayChannel() {
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36 this(-1);
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37 }
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38
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39 public ByteArrayChannel(int size) {
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40 if (size == -1) {
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41 buffers = new LinkedList<ByteBuffer>();
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42 } else {
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43 if (size < 0) {
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44 throw new IllegalArgumentException(String.valueOf(size));
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45 }
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46 buffers = null;
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47 target = ByteBuffer.allocate(size);
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48 }
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49 }
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50
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51 // TODO document what happens on write after toArray() in each case
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52 public int write(ByteBuffer buffer) {
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53 int rv = buffer.remaining();
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54 if (buffers == null) {
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55 target.put(buffer);
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56 } else {
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57 ByteBuffer copy = ByteBuffer.allocate(rv);
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58 copy.put(buffer);
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59 buffers.add(copy);
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60 }
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61 return rv;
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62 }
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63
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64 public byte[] toArray() {
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65 if (result != null) {
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66 return result;
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67 }
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68 if (buffers == null) {
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69 assert target.hasArray();
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70 // int total = target.position();
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71 // System.arraycopy(target.array(), new byte[total]);
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72 // I don't want to duplicate byte[] for now
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73 // although correct way of doing things is to make a copy and discard target
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74 return target.array();
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75 } else {
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76 int total = 0;
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77 for (ByteBuffer bb : buffers) {
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78 bb.flip();
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79 total += bb.limit();
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80 }
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81 result = new byte[total];
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82 int off = 0;
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83 for (ByteBuffer bb : buffers) {
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84 bb.get(result, off, bb.limit());
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85 off += bb.limit();
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86 }
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87 buffers.clear();
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88 return result;
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89 }
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90 }
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91 }