Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/DataSerializer.java @ 621:99ad1e3a4e4d

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RevlogStream: be aware of existence (not HgDataFile), facilitate use of an added HgDataFile over a commit; Rollback: be more sensitive about file changes (file size is not enough: write/rollback leaves it intact); tests
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 18 May 2013 22:23:57 +0200
parents 7c0d2ce340b8
children 6526d8adbc0f
rev   line source
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1 /*
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2 * Copyright (c) 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.io.ByteArrayOutputStream;
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21 import org.tmatesoft.hg.core.HgIOException;
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23 /**
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24 * Serialization friend of {@link DataAccess}
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25 *
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26 * @author Artem Tikhomirov
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27 * @author TMate Software Ltd.
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28 */
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29 @Experimental(reason="Work in progress")
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30 public class DataSerializer {
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31 private byte[] buffer;
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32
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33 public void writeByte(byte... values) throws HgIOException {
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34 write(values, 0, values.length);
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35 }
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36
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37 public void writeInt(int... values) throws HgIOException {
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38 ensureBufferSize(4*values.length); // sizeof(int)
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39 int idx = 0;
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40 for (int v : values) {
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41 bigEndian(v, buffer, idx);
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42 idx += 4;
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43 }
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44 write(buffer, 0, idx);
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45 }
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47 public void write(byte[] data, int offset, int length) throws HgIOException {
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48 throw new HgIOException("Attempt to write to non-existent file", null);
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49 }
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51 public void done() throws HgIOException {
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52 // no-op
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53 }
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55 private void ensureBufferSize(int bytesNeeded) {
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56 if (buffer == null || buffer.length < bytesNeeded) {
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57 buffer = new byte[bytesNeeded];
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58 }
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59 }
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61 /**
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62 * Writes 4 bytes of supplied value into the buffer at given offset, big-endian.
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63 */
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64 public static final void bigEndian(int value, byte[] buffer, int offset) {
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65 assert offset + 4 <= buffer.length;
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66 buffer[offset++] = (byte) ((value >>> 24) & 0x0ff);
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67 buffer[offset++] = (byte) ((value >>> 16) & 0x0ff);
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68 buffer[offset++] = (byte) ((value >>> 8) & 0x0ff);
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69 buffer[offset++] = (byte) (value & 0x0ff);
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70 }
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71
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72 /**
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73 * Denotes an entity that wants to/could be serialized
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74 */
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75 @Experimental(reason="Work in progress")
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76 interface DataSource {
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77 /**
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78 * Invoked once for a single write operation,
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79 * although the source itself may get serialized several times
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80 */
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81 public void serialize(DataSerializer out) throws HgIOException;
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82
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83 /**
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84 * Hint of data length it would like to writes
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85 * @return -1 if can't answer
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86 */
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87 public int serializeLength();
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88 }
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90 public static class ByteArrayDataSource implements DataSource {
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91
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92 private final byte[] data;
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94 public ByteArrayDataSource(byte[] bytes) {
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95 data = bytes;
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96 }
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98 public void serialize(DataSerializer out) throws HgIOException {
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99 if (data != null) {
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100 out.write(data, 0, data.length);
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101 }
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102 }
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103
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104 public int serializeLength() {
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105 return data == null ? 0 : data.length;
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106 }
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107 }
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109 public static class ByteArrayDataSerializer extends DataSerializer {
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110 private final ByteArrayOutputStream out = new ByteArrayOutputStream();
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111
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112 @Override
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113 public void write(byte[] data, int offset, int length) {
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114 out.write(data, offset, length);
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115 }
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117 public byte[] toByteArray() {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 556
diff changeset
118 return out.toByteArray();
7c0d2ce340b8 Refactor approach how content finds it way down to a commit revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 556
diff changeset
119 }
534
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
120 }
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
121 }