Mercurial > hg4j
annotate src/org/tmatesoft/hg/internal/DataSerializer.java @ 708:4ffc17c0b534
Merge: tests for resolver and complex scenario. Enable commit for merged revisions. Reuse file revisions if nothing changed
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Tue, 20 Aug 2013 18:41:34 +0200 |
parents | 545b1d4cc11d |
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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 import java.io.IOException; |
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21 import java.io.OutputStream; |
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22 |
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23 import org.tmatesoft.hg.core.HgIOException; |
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24 import org.tmatesoft.hg.repo.HgRuntimeException; |
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25 |
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26 /** |
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27 * Serialization friend of {@link DataAccess}, similar to OutputStream with few handy methods |
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28 * |
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29 * @author Artem Tikhomirov |
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30 * @author TMate Software Ltd. |
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31 */ |
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32 @Experimental(reason="Work in progress") |
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33 public class DataSerializer { |
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34 private byte[] buffer; |
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35 |
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36 public void writeByte(byte... values) throws HgIOException { |
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37 write(values, 0, values.length); |
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38 } |
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39 |
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40 public void writeInt(int... values) throws HgIOException { |
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41 ensureBufferSize(4*values.length); // sizeof(int) |
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42 int idx = 0; |
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43 for (int v : values) { |
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44 bigEndian(v, buffer, idx); |
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45 idx += 4; |
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46 } |
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47 write(buffer, 0, idx); |
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48 } |
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49 |
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50 public void write(byte[] data, int offset, int length) throws HgIOException { |
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51 throw new HgIOException("Attempt to write to non-existent file", null); |
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52 } |
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53 |
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54 public void done() throws HgIOException { |
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55 // no-op |
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56 } |
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57 |
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58 private void ensureBufferSize(int bytesNeeded) { |
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59 if (buffer == null || buffer.length < bytesNeeded) { |
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60 buffer = new byte[bytesNeeded]; |
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61 } |
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62 } |
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63 |
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64 /** |
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65 * Writes 4 bytes of supplied value into the buffer at given offset, big-endian. |
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66 */ |
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67 public static final void bigEndian(int value, byte[] buffer, int offset) { |
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68 assert offset + 4 <= buffer.length; |
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69 buffer[offset++] = (byte) ((value >>> 24) & 0x0ff); |
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70 buffer[offset++] = (byte) ((value >>> 16) & 0x0ff); |
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71 buffer[offset++] = (byte) ((value >>> 8) & 0x0ff); |
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72 buffer[offset++] = (byte) (value & 0x0ff); |
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73 } |
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74 |
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75 /** |
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76 * Denotes an entity that wants to/could be serialized |
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77 */ |
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78 @Experimental(reason="Work in progress") |
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79 public interface DataSource { |
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80 /** |
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81 * Invoked once for a single write operation, |
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82 * although the source itself may get serialized several times |
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83 */ |
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84 public void serialize(DataSerializer out) throws HgIOException, HgRuntimeException; |
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85 |
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86 /** |
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87 * Hint of data length it would like to writes |
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88 * @return -1 if can't answer |
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89 */ |
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90 public int serializeLength() throws HgRuntimeException; |
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91 } |
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92 |
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93 public static class ByteArrayDataSource implements DataSource { |
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94 |
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95 private final byte[] data; |
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96 |
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97 public ByteArrayDataSource(byte[] bytes) { |
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98 data = bytes; |
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99 } |
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100 |
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101 public void serialize(DataSerializer out) throws HgIOException { |
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102 if (data != null) { |
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103 out.write(data, 0, data.length); |
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104 } |
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105 } |
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106 |
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107 public int serializeLength() { |
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108 return data == null ? 0 : data.length; |
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109 } |
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110 } |
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111 |
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112 /** |
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113 * Serialize data to byte array |
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114 */ |
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115 public static class ByteArraySerializer extends DataSerializer { |
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116 private final ByteArrayOutputStream out = new ByteArrayOutputStream(); |
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117 |
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118 @Override |
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119 public void write(byte[] data, int offset, int length) { |
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120 out.write(data, offset, length); |
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121 } |
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122 |
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123 public byte[] toByteArray() { |
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124 return out.toByteArray(); |
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125 } |
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126 } |
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127 |
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128 /** |
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129 * Bridge to the world of {@link java.io.OutputStream}. |
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130 * Caller instantiates the stream and is responsible to close it as appropriate, |
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131 * {@link #done() DataSerializer.done()} doesn't close the stream. |
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132 */ |
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133 public static class OutputStreamSerializer extends DataSerializer { |
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134 private final OutputStream out; |
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135 |
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136 public OutputStreamSerializer(OutputStream outputStream) { |
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137 out = outputStream; |
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138 } |
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139 |
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140 @Override |
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141 public void write(byte[] data, int offset, int length) throws HgIOException { |
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142 try { |
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143 out.write(data, offset, length); |
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144 } catch (IOException ex) { |
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145 throw new HgIOException(ex.getMessage(), ex, null); |
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146 } |
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147 } |
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148 } |
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149 } |