Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/DataSerializer.java @ 643:a8ce405da1f5
v1.2 line of dev: update versions, use patch merge code by default
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Wed, 19 Jun 2013 16:03:11 +0200 |
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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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47 |
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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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51 |
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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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90 |
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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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94 |
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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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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() { |
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119 return out.toByteArray(); |
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120 } |
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121 } |
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122 } |