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annotate src/org/tmatesoft/hg/internal/ByteArrayChannel.java @ 254:a620f0663a37

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Collect tags for a file - improve performance of 'sparse' manifest reads
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 04:03:29 +0200
parents 1a7a9a20e1f9
children e1b29756f901
rev   line source
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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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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 }