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annotate src/org/tmatesoft/hg/internal/DataSerializer.java @ 636:ffce73efa2c2

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 06 Jun 2013 19:39:06 +0200
parents 6526d8adbc0f
children 14dac192aa26
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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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20
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21 import org.tmatesoft.hg.core.HgIOException;
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22 import org.tmatesoft.hg.repo.HgRuntimeException;
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23
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24 /**
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25 * Serialization friend of {@link DataAccess}
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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 @Experimental(reason="Work in progress")
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31 public class DataSerializer {
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32 private byte[] buffer;
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33
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34 public void writeByte(byte... values) throws HgIOException {
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35 write(values, 0, values.length);
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36 }
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37
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38 public void writeInt(int... values) throws HgIOException {
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39 ensureBufferSize(4*values.length); // sizeof(int)
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40 int idx = 0;
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41 for (int v : values) {
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42 bigEndian(v, buffer, idx);
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43 idx += 4;
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44 }
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45 write(buffer, 0, idx);
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46 }
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48 public void write(byte[] data, int offset, int length) throws HgIOException {
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49 throw new HgIOException("Attempt to write to non-existent file", null);
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50 }
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52 public void done() throws HgIOException {
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53 // no-op
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54 }
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55
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56 private void ensureBufferSize(int bytesNeeded) {
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57 if (buffer == null || buffer.length < bytesNeeded) {
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58 buffer = new byte[bytesNeeded];
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59 }
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60 }
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61
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62 /**
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63 * Writes 4 bytes of supplied value into the buffer at given offset, big-endian.
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64 */
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65 public static final void bigEndian(int value, byte[] buffer, int offset) {
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66 assert offset + 4 <= buffer.length;
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67 buffer[offset++] = (byte) ((value >>> 24) & 0x0ff);
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68 buffer[offset++] = (byte) ((value >>> 16) & 0x0ff);
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69 buffer[offset++] = (byte) ((value >>> 8) & 0x0ff);
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70 buffer[offset++] = (byte) (value & 0x0ff);
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71 }
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72
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73 /**
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74 * Denotes an entity that wants to/could be serialized
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75 */
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76 @Experimental(reason="Work in progress")
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77 interface DataSource {
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78 /**
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79 * Invoked once for a single write operation,
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80 * although the source itself may get serialized several times
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81 */
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82 public void serialize(DataSerializer out) throws HgIOException, HgRuntimeException;
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83
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84 /**
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85 * Hint of data length it would like to writes
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86 * @return -1 if can't answer
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87 */
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88 public int serializeLength() throws HgRuntimeException;
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89 }
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91 public static class ByteArrayDataSource implements DataSource {
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92
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93 private final byte[] data;
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95 public ByteArrayDataSource(byte[] bytes) {
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96 data = bytes;
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97 }
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98
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99 public void serialize(DataSerializer out) throws HgIOException {
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100 if (data != null) {
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101 out.write(data, 0, data.length);
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102 }
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103 }
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105 public int serializeLength() {
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106 return data == null ? 0 : data.length;
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107 }
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108 }
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109
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110 public static class ByteArrayDataSerializer extends DataSerializer {
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111 private final ByteArrayOutputStream out = new ByteArrayOutputStream();
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112
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113 @Override
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114 public void write(byte[] data, int offset, int length) {
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115 out.write(data, offset, length);
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116 }
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117
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118 public byte[] toByteArray() {
7c0d2ce340b8 Refactor approach how content finds it way down to a commit revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
119 return out.toByteArray();
7c0d2ce340b8 Refactor approach how content finds it way down to a commit revision
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 556
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120 }
534
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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121 }
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
122 }