Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/Nodeid.java @ 167:86f9581f4301

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Write down results of changegroup (or any other BundleFormat) wireprotocol command
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 22 Mar 2011 03:52:34 +0100
parents 1a7a9a20e1f9
children 71ddbf8603e8
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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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 * @throws IllegalArgumentException if supplied binary representation doesn't correspond to 20 bytes of sha1 digest
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46 */
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47 public Nodeid(byte[] binaryRepresentation, boolean shallClone) {
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48 // 5 int fields => 32 bytes
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49 // byte[20] => 48 bytes
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50 if (binaryRepresentation == null || binaryRepresentation.length != 20) {
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51 throw new IllegalArgumentException();
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52 }
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53 this.binaryData = shallClone ? binaryRepresentation.clone() : binaryRepresentation;
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54 }
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55
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56 @Override
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57 public int hashCode() {
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58 // digest (part thereof) seems to be nice candidate for the hashCode
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59 byte[] b = binaryData;
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60 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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61 }
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62
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63 @Override
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64 public boolean equals(Object o) {
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65 if (o instanceof Nodeid) {
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66 return this == o || equalsTo(((Nodeid) o).binaryData);
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67 }
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68 return false;
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69 }
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70
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71 public boolean equalsTo(byte[] buf) {
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72 return Arrays.equals(this.binaryData, buf);
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73 }
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75 @Override
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76 public String toString() {
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77 // XXX may want to output just single 0 for the NULL id?
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78 return toHexString(binaryData, 0, binaryData.length);
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79 }
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80
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81 public String shortNotation() {
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82 return toHexString(binaryData, 0, 6);
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83 }
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84
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85 public boolean isNull() {
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86 if (this == NULL) {
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87 return true;
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88 }
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89 for (int i = 0; i < 20; i++) {
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90 if (this.binaryData[i] != 0) {
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91 return false;
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92 }
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93 }
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94 return true;
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95 }
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96
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97 // copy
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98 public byte[] toByteArray() {
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99 return binaryData.clone();
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100 }
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101
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102 /**
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103 * Factory for {@link Nodeid Nodeids}.
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104 * Primary difference with cons is handling of NULL id (this method returns constant) and control over array
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105 * duplication - this method always makes a copy of an array passed
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106 * @param binaryRepresentation - byte array of a length at least offset + 20
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107 * @param offset - index in the array to start from
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108 * @throws IllegalArgumentException when arguments don't select 20 bytes
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109 */
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110 public static Nodeid fromBinary(byte[] binaryRepresentation, int offset) {
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111 if (binaryRepresentation == null || binaryRepresentation.length - offset < 20) {
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112 throw new IllegalArgumentException();
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113 }
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114 int i = 0;
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115 while (i < 20 && binaryRepresentation[offset+i] == 0) i++;
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116 if (i == 20) {
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117 return NULL;
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118 }
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119 if (offset == 0 && binaryRepresentation.length == 20) {
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120 return new Nodeid(binaryRepresentation, true);
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121 }
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122 byte[] b = new byte[20]; // create new instance if no other reasonable guesses possible
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123 System.arraycopy(binaryRepresentation, offset, b, 0, 20);
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124 return new Nodeid(b, false);
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125 }
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126
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127 /**
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128 * Parse encoded representation.
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129 *
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130 * @param asciiRepresentation - encoded form of the Nodeid.
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131 * @return object representation
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132 * @throws IllegalArgumentException when argument doesn't match encoded form of 20-bytes sha1 digest.
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133 */
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134 public static Nodeid fromAscii(String asciiRepresentation) {
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135 if (asciiRepresentation.length() != 40) {
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136 throw new IllegalArgumentException();
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137 }
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138 // XXX is better impl for String possible?
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139 return fromAscii(asciiRepresentation.getBytes(), 0, 40);
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140 }
148
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141
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142 /**
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143 * Parse encoded representation. Similar to {@link #fromAscii(String)}.
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144 */
0
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145 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
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146 if (length != 40) {
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147 throw new IllegalArgumentException();
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148 }
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149 byte[] data = new byte[20];
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150 boolean zeroBytes = true;
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151 for (int i = 0, j = offset; i < data.length; i++) {
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152 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
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153 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
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154 byte b = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
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155 data[i] = b;
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156 zeroBytes = zeroBytes && b == 0;
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157 }
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158 if (zeroBytes) {
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159 return NULL;
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160 }
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161 return new Nodeid(data, false);
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162 }
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163 }