Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/Nodeid.java @ 655:bcbcc318f250

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Performance: reuse unzip output buffer
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 04 Jul 2013 18:36:38 +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++) {
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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
148
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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 }