Mercurial > jhg

annotate src/org/tmatesoft/hg/core/Nodeid.java @ 222:373e07cd3991

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Due to discrepancy in manifest and changelor indexes, wrong manifest revisions got cached and compared
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 19 May 2011 05:02:07 +0200
parents 3a7696fb457c
children 4b661efb9374
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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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 implements Comparable<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 (16 bytes is Nodeid with one field, 32 bytes for byte[20]
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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 /*
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54 * byte[].clone() is not reflected when ran with -agentlib:hprof=heap=sites
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55 * thus not to get puzzled why there are N Nodeids and much less byte[] instances,
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56 * may use following code to see N byte[] as well.
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57 *
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58 if (shallClone) {
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59 binaryData = new byte[20];
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60 System.arraycopy(binaryRepresentation, 0, binaryData, 0, 20);
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61 } else {
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62 binaryData = binaryRepresentation;
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63 }
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64 */
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65 binaryData = shallClone ? binaryRepresentation.clone() : binaryRepresentation;
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66 }
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68 @Override
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69 public int hashCode() {
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70 // digest (part thereof) seems to be nice candidate for the hashCode
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71 byte[] b = binaryData;
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72 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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73 }
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75 @Override
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76 public boolean equals(Object o) {
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77 if (o instanceof Nodeid) {
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78 return this == o || equalsTo(((Nodeid) o).binaryData);
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79 }
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80 return false;
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81 }
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82
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83 public boolean equalsTo(byte[] buf) {
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84 return Arrays.equals(this.binaryData, buf);
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85 }
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87 public int compareTo(Nodeid o) {
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88 if (this == o) {
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89 return 0;
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90 }
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91 for (int i = 0; i < 20; i++) {
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92 if (binaryData[i] != o.binaryData[i]) {
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93 return binaryData[i] < o.binaryData[i] ? -1 : 1;
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94 }
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95 }
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96 return 0;
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97 }
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99 @Override
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100 public String toString() {
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101 // XXX may want to output just single 0 for the NULL id?
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102 return toHexString(binaryData, 0, binaryData.length);
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103 }
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104
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105 public String shortNotation() {
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106 return toHexString(binaryData, 0, 6);
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107 }
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108
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109 public boolean isNull() {
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110 if (this == NULL) {
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111 return true;
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112 }
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113 for (int i = 0; i < 20; i++) {
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114 if (this.binaryData[i] != 0) {
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115 return false;
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116 }
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117 }
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118 return true;
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119 }
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121 // copy
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122 public byte[] toByteArray() {
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123 return binaryData.clone();
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124 }
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125
148
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126 /**
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127 * Factory for {@link Nodeid Nodeids}.
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128 * Primary difference with cons is handling of NULL id (this method returns constant) and control over array
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129 * duplication - this method always makes a copy of an array passed
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130 * @param binaryRepresentation - byte array of a length at least offset + 20
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131 * @param offset - index in the array to start from
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132 * @throws IllegalArgumentException when arguments don't select 20 bytes
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133 */
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134 public static Nodeid fromBinary(byte[] binaryRepresentation, int offset) {
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135 if (binaryRepresentation == null || binaryRepresentation.length - offset < 20) {
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136 throw new IllegalArgumentException();
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137 }
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138 int i = 0;
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139 while (i < 20 && binaryRepresentation[offset+i] == 0) i++;
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140 if (i == 20) {
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141 return NULL;
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142 }
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143 if (offset == 0 && binaryRepresentation.length == 20) {
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144 return new Nodeid(binaryRepresentation, true);
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145 }
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146 byte[] b = new byte[20]; // create new instance if no other reasonable guesses possible
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147 System.arraycopy(binaryRepresentation, offset, b, 0, 20);
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148 return new Nodeid(b, false);
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149 }
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150
148
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151 /**
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152 * Parse encoded representation.
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153 *
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154 * @param asciiRepresentation - encoded form of the Nodeid.
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155 * @return object representation
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156 * @throws IllegalArgumentException when argument doesn't match encoded form of 20-bytes sha1 digest.
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157 */
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158 public static Nodeid fromAscii(String asciiRepresentation) {
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159 if (asciiRepresentation.length() != 40) {
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160 throw new IllegalArgumentException();
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161 }
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162 // XXX is better impl for String possible?
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163 return fromAscii(asciiRepresentation.getBytes(), 0, 40);
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164 }
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165
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166 /**
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167 * Parse encoded representation. Similar to {@link #fromAscii(String)}.
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168 */
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169 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
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170 if (length != 40) {
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171 throw new IllegalArgumentException();
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172 }
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173 byte[] data = new byte[20];
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174 boolean zeroBytes = true;
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175 for (int i = 0, j = offset; i < data.length; i++) {
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176 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
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177 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
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178 byte b = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
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179 data[i] = b;
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180 zeroBytes = zeroBytes && b == 0;
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181 }
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182 if (zeroBytes) {
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183 return NULL;
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184 }
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185 return new Nodeid(data, false);
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186 }
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187 }