Mercurial > hg4j
annotate src/org/tmatesoft/hg/core/Nodeid.java @ 141:8248aae33f7d
Adopt FileIterator moving towards WCStatusCollector parameterizing. Improved path handling, move 'em around
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 17 Feb 2011 04:08:34 +0100 |
parents | 26ad21b250e4 |
children | 1a7a9a20e1f9 |
rev | line source |
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1 /* |
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2 * Copyright (c) 2010-2011 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.core; |
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18 |
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19 import static org.tmatesoft.hg.internal.DigestHelper.toHexString; |
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20 |
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21 import java.util.Arrays; |
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22 |
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23 |
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24 |
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25 /** |
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26 * A 20-bytes (40 characters) long hash value to identify a revision. |
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27 * @see http://mercurial.selenic.com/wiki/Nodeid |
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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 */ |
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33 public final class Nodeid { |
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34 |
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35 /** |
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36 * <b>nullid</b>, empty root revision. |
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37 */ |
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38 public static final Nodeid NULL = new Nodeid(new byte[20], false); |
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39 |
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40 private final byte[] binaryData; |
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41 |
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42 /** |
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43 * @param binaryRepresentation - array of exactly 20 bytes |
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44 * @param shallClone - true if array is subject to future modification and shall be copied, not referenced |
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45 */ |
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46 public Nodeid(byte[] binaryRepresentation, boolean shallClone) { |
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47 // 5 int fields => 32 bytes |
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48 // byte[20] => 48 bytes |
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49 if (binaryRepresentation == null || binaryRepresentation.length != 20) { |
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50 throw new IllegalArgumentException(); |
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51 } |
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52 this.binaryData = shallClone ? binaryRepresentation.clone() : binaryRepresentation; |
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53 } |
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54 |
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55 @Override |
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56 public int hashCode() { |
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57 // digest (part thereof) seems to be nice candidate for the hashCode |
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58 byte[] b = binaryData; |
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59 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF); |
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60 } |
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61 |
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62 @Override |
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63 public boolean equals(Object o) { |
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64 if (o instanceof Nodeid) { |
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65 return this == o || equalsTo(((Nodeid) o).binaryData); |
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66 } |
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67 return false; |
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68 } |
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69 |
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70 public boolean equalsTo(byte[] buf) { |
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71 return Arrays.equals(this.binaryData, buf); |
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72 } |
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73 |
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74 @Override |
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75 public String toString() { |
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76 // XXX may want to output just single 0 for the NULL id? |
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77 return toHexString(binaryData, 0, binaryData.length); |
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78 } |
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79 |
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80 public String shortNotation() { |
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81 return toHexString(binaryData, 0, 6); |
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82 } |
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83 |
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84 public boolean isNull() { |
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85 if (this == NULL) { |
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86 return true; |
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87 } |
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88 for (int i = 0; i < 20; i++) { |
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89 if (this.binaryData[i] != 0) { |
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90 return false; |
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91 } |
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92 } |
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93 return true; |
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94 } |
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95 |
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96 // copy |
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97 public byte[] toByteArray() { |
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98 return binaryData.clone(); |
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99 } |
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100 |
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101 // primary difference with cons is handling of NULL id (this method returns constant) |
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102 // always makes a copy of an array passed |
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103 public static Nodeid fromBinary(byte[] binaryRepresentation, int offset) { |
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104 if (binaryRepresentation == null || binaryRepresentation.length - offset < 20) { |
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105 throw new IllegalArgumentException(); |
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106 } |
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107 int i = 0; |
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108 while (i < 20 && binaryRepresentation[offset+i] == 0) i++; |
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109 if (i == 20) { |
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110 return NULL; |
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111 } |
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112 if (offset == 0 && binaryRepresentation.length == 20) { |
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113 return new Nodeid(binaryRepresentation, true); |
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114 } |
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115 byte[] b = new byte[20]; // create new instance if no other reasonable guesses possible |
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116 System.arraycopy(binaryRepresentation, offset, b, 0, 20); |
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117 return new Nodeid(b, false); |
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118 } |
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119 |
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120 public static Nodeid fromAscii(String asciiRepresentation) { |
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121 if (asciiRepresentation.length() != 40) { |
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122 throw new IllegalArgumentException(); |
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123 } |
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124 // XXX is better impl for String possible? |
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125 return fromAscii(asciiRepresentation.getBytes(), 0, 40); |
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126 } |
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127 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) { |
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128 if (length != 40) { |
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129 throw new IllegalArgumentException(); |
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130 } |
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131 byte[] data = new byte[20]; |
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132 boolean zeroBytes = true; |
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133 for (int i = 0, j = offset; i < data.length; i++) { |
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134 int hiNibble = Character.digit(asciiRepresentation[j++], 16); |
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135 int lowNibble = Character.digit(asciiRepresentation[j++], 16); |
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136 byte b = (byte) (((hiNibble << 4) | lowNibble) & 0xFF); |
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137 data[i] = b; |
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138 zeroBytes = zeroBytes && b == 0; |
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139 } |
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140 if (zeroBytes) { |
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141 return NULL; |
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142 } |
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143 return new Nodeid(data, false); |
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144 } |
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145 } |