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annotate src/org/tmatesoft/hg/internal/ByteArrayChannel.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
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 }