Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/Nodeid.java @ 176:a8df7162ec75

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Extracting complete branch using remote between call to detect incoming changes is done. Arguments reorderd in remote repo to better match Hg server ideology, not my mental convenience
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 02 Apr 2011 03:01:14 +0200
parents 71ddbf8603e8
children 3a7696fb457c
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 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
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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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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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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 public int compareTo(Nodeid o) {
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76 if (this == o) {
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77 return 0;
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78 }
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79 for (int i = 0; i < 20; i++) {
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80 if (binaryData[i] != o.binaryData[i]) {
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81 return binaryData[i] < o.binaryData[i] ? -1 : 1;
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82 }
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83 }
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84 return 0;
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85 }
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87 @Override
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88 public String toString() {
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89 // XXX may want to output just single 0 for the NULL id?
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90 return toHexString(binaryData, 0, binaryData.length);
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91 }
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92
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93 public String shortNotation() {
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94 return toHexString(binaryData, 0, 6);
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95 }
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97 public boolean isNull() {
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98 if (this == NULL) {
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99 return true;
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100 }
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101 for (int i = 0; i < 20; i++) {
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102 if (this.binaryData[i] != 0) {
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103 return false;
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104 }
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105 }
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106 return true;
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107 }
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108
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109 // copy
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110 public byte[] toByteArray() {
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111 return binaryData.clone();
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112 }
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113
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114 /**
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115 * Factory for {@link Nodeid Nodeids}.
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116 * Primary difference with cons is handling of NULL id (this method returns constant) and control over array
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117 * duplication - this method always makes a copy of an array passed
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118 * @param binaryRepresentation - byte array of a length at least offset + 20
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119 * @param offset - index in the array to start from
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120 * @throws IllegalArgumentException when arguments don't select 20 bytes
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121 */
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122 public static Nodeid fromBinary(byte[] binaryRepresentation, int offset) {
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123 if (binaryRepresentation == null || binaryRepresentation.length - offset < 20) {
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124 throw new IllegalArgumentException();
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125 }
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126 int i = 0;
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127 while (i < 20 && binaryRepresentation[offset+i] == 0) i++;
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128 if (i == 20) {
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129 return NULL;
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130 }
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131 if (offset == 0 && binaryRepresentation.length == 20) {
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132 return new Nodeid(binaryRepresentation, true);
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133 }
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134 byte[] b = new byte[20]; // create new instance if no other reasonable guesses possible
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135 System.arraycopy(binaryRepresentation, offset, b, 0, 20);
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136 return new Nodeid(b, false);
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137 }
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138
148
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139 /**
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140 * Parse encoded representation.
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141 *
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142 * @param asciiRepresentation - encoded form of the Nodeid.
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143 * @return object representation
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144 * @throws IllegalArgumentException when argument doesn't match encoded form of 20-bytes sha1 digest.
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145 */
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146 public static Nodeid fromAscii(String asciiRepresentation) {
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147 if (asciiRepresentation.length() != 40) {
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148 throw new IllegalArgumentException();
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149 }
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150 // XXX is better impl for String possible?
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151 return fromAscii(asciiRepresentation.getBytes(), 0, 40);
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152 }
148
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153
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154 /**
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155 * Parse encoded representation. Similar to {@link #fromAscii(String)}.
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156 */
0
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157 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) {
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158 if (length != 40) {
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159 throw new IllegalArgumentException();
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160 }
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161 byte[] data = new byte[20];
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162 boolean zeroBytes = true;
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163 for (int i = 0, j = offset; i < data.length; i++) {
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164 int hiNibble = Character.digit(asciiRepresentation[j++], 16);
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165 int lowNibble = Character.digit(asciiRepresentation[j++], 16);
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166 byte b = (byte) (((hiNibble << 4) | lowNibble) & 0xFF);
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167 data[i] = b;
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168 zeroBytes = zeroBytes && b == 0;
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169 }
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170 if (zeroBytes) {
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171 return NULL;
0
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172 }
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173 return new Nodeid(data, false);
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174 }
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175 }