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annotate src/org/tmatesoft/hg/core/Nodeid.java @ 153:ab7ea2ac21cb

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 24 Feb 2011 21:38:46 +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 }