Mercurial > jhg

annotate src/org/tmatesoft/hg/core/Nodeid.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents d29d9dc6c128
children
rev   line source
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1 /*
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2 * Copyright (c) 2010-2013 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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23 import org.tmatesoft.hg.internal.DigestHelper;
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27 /**
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28 * A 20-bytes (40 characters) long hash value to identify a revision.
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29 * @see http://mercurial.selenic.com/wiki/Nodeid
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 *
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34 */
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35 public final class Nodeid implements Comparable<Nodeid> {
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36
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37 /**
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38 * Length of the nodeid in bytes
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39 */
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40 public static final int SIZE = 20;
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41
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42 /**
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43 * Length of nodeid string representation, in bytes
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44 */
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45 public static final int SIZE_ASCII = 40;
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47 /**
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48 * <b>nullid</b>, empty root revision.
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49 */
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50 public static final Nodeid NULL = new Nodeid(new byte[SIZE], false);
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51
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52 private final byte[] binaryData;
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54 /**
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55 * @param binaryRepresentation - array of exactly 20 bytes
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56 * @param shallClone - true if array is subject to future modification and shall be copied, not referenced
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57 * @throws HgBadNodeidFormatException custom {@link IllegalArgumentException} subclass if supplied binary representation doesn't correspond to 20 bytes of sha1 digest
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58 */
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59 public Nodeid(byte[] binaryRepresentation, boolean shallClone) {
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60 // 5 int fields => 32 bytes
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61 // byte[20] => 48 bytes (16 bytes is Nodeid with one field, 32 bytes for byte[20]
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62 if (binaryRepresentation == null || binaryRepresentation.length != SIZE) {
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63 throw new HgBadNodeidFormatException(String.format("Bad value: %s", String.valueOf(binaryRepresentation)));
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64 }
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65 /*
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66 * byte[].clone() is not reflected when ran with -agentlib:hprof=heap=sites
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67 * thus not to get puzzled why there are N Nodeids and much less byte[] instances,
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68 * may use following code to see N byte[] as well.
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69 *
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70 if (shallClone) {
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71 binaryData = new byte[20];
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72 System.arraycopy(binaryRepresentation, 0, binaryData, 0, 20);
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73 } else {
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74 binaryData = binaryRepresentation;
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75 }
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76 */
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77 binaryData = shallClone ? binaryRepresentation.clone() : binaryRepresentation;
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78 }
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80 @Override
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81 public int hashCode() {
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82 return hashCode(binaryData);
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83 }
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84
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85 /**
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86 * Handy alternative to calculate hashcode without need to get {@link Nodeid} instance
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87 * @param binaryNodeid array of exactly 20 bytes
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88 * @return same value as <code>new Nodeid(binaryNodeid, false).hashCode()</code>
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89 */
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90 public static int hashCode(byte[] binaryNodeid) {
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91 assert binaryNodeid.length == SIZE;
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92 // digest (part thereof) seems to be nice candidate for the hashCode
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93 byte[] b = binaryNodeid;
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94 return b[0] << 24 | (b[1] & 0xFF) << 16 | (b[2] & 0xFF) << 8 | (b[3] & 0xFF);
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95 }
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97 @Override
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98 public boolean equals(Object o) {
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99 if (o == this) {
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100 return true;
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101 }
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102 if (o instanceof Nodeid) {
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103 return equalsTo(((Nodeid) o).binaryData);
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104 }
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105 return false;
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106 }
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107
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108 public boolean equalsTo(byte[] buf) {
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109 return Arrays.equals(this.binaryData, buf);
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110 }
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112 public int compareTo(Nodeid o) {
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113 if (this == o) {
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114 return 0;
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115 }
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116 for (int i = 0; i < SIZE; i++) {
170
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117 if (binaryData[i] != o.binaryData[i]) {
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118 // if we need truly ascending sort, need to respect byte sign
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119 // return (binaryData[i] & 0xFF) < (o.binaryData[i] & 0xFF) ? -1 : 1;
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120 // however, for our purposes partial sort is pretty enough
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121 return binaryData[i] < o.binaryData[i] ? -1 : 1;
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122 }
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123 }
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124 return 0;
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125 }
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126
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127 /**
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128 * Complete string representation of this Nodeid.
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129 */
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130 @Override
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131 public String toString() {
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132 // XXX may want to output just single 0 for the NULL id?
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133 return toHexString(binaryData, 0, binaryData.length);
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134 }
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135
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136 public String shortNotation() {
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137 return toHexString(binaryData, 0, 6);
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138 }
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139
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140 public boolean isNull() {
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141 if (this == NULL) {
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142 return true;
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143 }
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144 for (int i = 0; i < SIZE; i++) {
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145 if (this.binaryData[i] != 0) {
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146 return false;
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147 }
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148 }
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149 return true;
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150 }
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151
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152 // copy
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153 public byte[] toByteArray() {
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154 return binaryData.clone();
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155 }
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156
148
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157 /**
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158 * Factory for {@link Nodeid Nodeids}.
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159 * Primary difference with cons is handling of NULL id (this method returns constant) and control over array
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160 * duplication - this method always makes a copy of an array passed
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161 * @param binaryRepresentation - byte array of a length at least offset + 20
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162 * @param offset - index in the array to start from
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163 * @throws HgBadNodeidFormatException custom {@link IllegalArgumentException} subclass when arguments don't select 20 bytes
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164 */
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165 public static Nodeid fromBinary(byte[] binaryRepresentation, int offset) {
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166 if (binaryRepresentation == null || binaryRepresentation.length - offset < SIZE) {
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167 throw new HgBadNodeidFormatException(String.format("Bad value: %s", String.valueOf(binaryRepresentation)));
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168 }
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169 int i = 0;
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170 while (i < SIZE && binaryRepresentation[offset+i] == 0) i++;
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171 if (i == SIZE) {
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172 return NULL;
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173 }
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174 if (offset == 0 && binaryRepresentation.length == SIZE) {
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175 return new Nodeid(binaryRepresentation, true);
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176 }
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177 byte[] b = new byte[SIZE]; // create new instance if no other reasonable guesses possible
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178 System.arraycopy(binaryRepresentation, offset, b, 0, SIZE);
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179 return new Nodeid(b, false);
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180 }
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181
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182 /**
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183 * Parse encoded representation.
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184 *
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185 * @param asciiRepresentation - encoded form of the Nodeid.
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186 * @return object representation
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187 * @throws HgBadNodeidFormatException custom {@link IllegalArgumentException} subclass when argument doesn't match encoded form of 20-bytes sha1 digest.
148
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188 */
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189 public static Nodeid fromAscii(String asciiRepresentation) throws HgBadNodeidFormatException {
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190 if (asciiRepresentation.length() != SIZE_ASCII) {
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191 throw new HgBadNodeidFormatException(String.format("Bad value: %s", asciiRepresentation));
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192 }
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193 // XXX is better impl for String possible?
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194 return fromAscii(asciiRepresentation.toCharArray(), 0, SIZE_ASCII);
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195 }
261
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196
148
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197 /**
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198 * Parse encoded representation. Similar to {@link #fromAscii(String)}.
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199 * @throws HgBadNodeidFormatException custom {@link IllegalArgumentException} subclass when bytes are not hex digits or number of bytes != 40 (160 bits)
148
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200 */
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201 public static Nodeid fromAscii(byte[] asciiRepresentation, int offset, int length) throws HgBadNodeidFormatException {
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202 if (length != SIZE_ASCII) {
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203 throw new HgBadNodeidFormatException(String.format("Expected %d hex characters for nodeid, not %d", SIZE_ASCII, length));
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204 }
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205 try {
598
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206 byte[] data = new byte[SIZE];
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207 boolean zeroBytes = DigestHelper.ascii2bin(asciiRepresentation, offset, length, data);
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208 if (zeroBytes) {
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209 return NULL;
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210 }
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211 return new Nodeid(data, false);
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212 } catch (HgBadNodeidFormatException ex) {
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213 throw ex;
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214 } catch (IllegalArgumentException ex) {
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215 throw new HgBadNodeidFormatException(ex.getMessage());
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216 }
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217 }
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218
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219 public static Nodeid fromAscii(char[] asciiRepresentation, int offset, int length) {
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220 byte[] b = new byte[length];
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221 for (int i = 0; i < b.length; i++) {
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222 b[i] = (byte) asciiRepresentation[offset+i];
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223 }
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224 return fromAscii(b, 0, b.length);
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225 }
0
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226 }