Mercurial > hg4j

annotate src/org/tmatesoft/hg/internal/ChangesetParser.java @ 709:497e697636fc

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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 545b1d4cc11d
children
rev   line source
673
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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.internal;
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18
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19 import java.io.IOException;
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20 import java.util.ArrayList;
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21 import java.util.Collections;
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22 import java.util.Date;
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23 import java.util.HashMap;
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24 import java.util.List;
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25 import java.util.Map;
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26
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.core.SessionContext;
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29 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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30 import org.tmatesoft.hg.repo.HgInvalidDataFormatException;
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31 import org.tmatesoft.hg.repo.HgRepository;
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32
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33 /**
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34 * @see mercurial/changelog.py:read()
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35 *
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36 * <pre>
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37 * format used:
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38 * nodeid\n : manifest node in ascii
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39 * user\n : user, no \n or \r allowed
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40 * time tz extra\n : date (time is int or float, timezone is int)
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41 * : extra is metadatas, encoded and separated by '\0'
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42 * : older versions ignore it
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43 * files\n\n : files modified by the cset, no \n or \r allowed
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44 * (.*) : comment (free text, ideally utf-8)
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45 *
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46 * changelog v0 doesn't use extra
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47 * </pre>
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48 *
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49 * Extracted from internals of HgChangelog (the code initially from inside RawChangeset)
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50 *
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51 * @author Artem Tikhomirov
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52 * @author TMate Software Ltd.
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53 */
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54 public final class ChangesetParser {
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55 private final EncodingHelper encHelper;
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56 // it's likely user names get repeated again and again throughout repository.
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57 private final Pool<String> usersPool;
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58 private final Pool<String> filesPool;
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59 private final CsetFactory factory;
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60
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61 public ChangesetParser(SessionContext.Source sessionContex, CsetFactory csetFactory) {
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62 assert csetFactory != null;
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63 encHelper = Internals.buildFileNameEncodingHelper(sessionContex);
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64 usersPool = new Pool<String>();
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65 filesPool = new Pool<String>();
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66 factory = csetFactory;
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67 }
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68
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69 public void dispose() {
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70 usersPool.clear();
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71 filesPool.clear();
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72 }
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73
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74 public RawChangeset parse(DataAccess da) throws IOException, HgInvalidDataFormatException {
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75 byte[] data = da.byteArray();
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76 return parse(data);
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77 }
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78
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79 public RawChangeset parse(byte[] data) throws HgInvalidDataFormatException {
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80 return init(data, 0, data.length);
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81 }
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82
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83 private RawChangeset init(byte[] data, int offset, int length) throws HgInvalidDataFormatException {
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84 final int bufferEndIndex = offset + length;
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85 final byte lineBreak = (byte) '\n';
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86 int breakIndex1 = indexOf(data, lineBreak, offset, bufferEndIndex);
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87 if (breakIndex1 == -1) {
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88 throw new HgInvalidDataFormatException("Bad Changeset data");
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89 }
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90 Nodeid _nodeid = Nodeid.fromAscii(data, 0, breakIndex1);
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91 int breakIndex2 = indexOf(data, lineBreak, breakIndex1 + 1, bufferEndIndex);
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92 if (breakIndex2 == -1) {
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93 throw new HgInvalidDataFormatException("Bad Changeset data");
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94 }
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95 String _user;
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96 _user = encHelper.userFromChangeset(data, breakIndex1 + 1, breakIndex2 - breakIndex1 - 1);
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97 _user = usersPool.unify(_user);
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98
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99 int breakIndex3 = indexOf(data, lineBreak, breakIndex2 + 1, bufferEndIndex);
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100 if (breakIndex3 == -1) {
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101 throw new HgInvalidDataFormatException("Bad Changeset data");
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102 }
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103 String _timeString = new String(data, breakIndex2 + 1, breakIndex3 - breakIndex2 - 1);
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104 int space1 = _timeString.indexOf(' ');
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105 if (space1 == -1) {
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106 throw new HgInvalidDataFormatException(String.format("Bad Changeset data: %s in [%d..%d]", "time string", breakIndex2+1, breakIndex3));
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107 }
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108 int space2 = _timeString.indexOf(' ', space1 + 1);
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109 if (space2 == -1) {
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110 space2 = _timeString.length();
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111 }
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112 long unixTime = Long.parseLong(_timeString.substring(0, space1));
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113 int _timezone = Integer.parseInt(_timeString.substring(space1 + 1, space2));
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114 // unixTime is local time, and timezone records difference of the local time to UTC.
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115 Date _time = new Date(unixTime * 1000);
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116 String _extras = space2 < _timeString.length() ? _timeString.substring(space2 + 1) : null;
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117 Map<String, String> _extrasMap = parseExtras(_extras);
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118 //
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119 int lastStart = breakIndex3 + 1;
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120 int breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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121 ArrayList<String> _files = null;
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122 if (breakIndex4 > lastStart) {
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123 // if breakIndex4 == lastStart, we already found \n\n and hence there are no files (e.g. merge revision)
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124 _files = new ArrayList<String>(5);
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125 while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) {
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126 String fname = encHelper.fileFromChangeset(data, lastStart, breakIndex4 - lastStart);
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127 _files.add(filesPool.unify(fname));
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128 lastStart = breakIndex4 + 1;
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129 if (data[breakIndex4 + 1] == lineBreak) {
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130 // found \n\n
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131 break;
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132 } else {
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133 breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
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134 }
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135 }
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136 if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) {
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137 throw new HgInvalidDataFormatException("Bad Changeset data");
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138 }
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139 } else {
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140 breakIndex4--;
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141 }
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142 String _comment = encHelper.commentFromChangeset(data, breakIndex4 + 2, bufferEndIndex - breakIndex4 - 2);
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143 RawChangeset target = factory.create(_nodeid, _user, _time, _timezone, _files, _comment, _extrasMap);
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144 return target;
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145 }
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146
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147 private Map<String, String> parseExtras(String _extras) {
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148 final String extras_branch_key = "branch";
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149 _extras = _extras == null ? null : _extras.trim();
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150 if (_extras == null || _extras.length() == 0) {
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151 return Collections.singletonMap(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
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152 }
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153 Map<String, String> _extrasMap = new HashMap<String, String>();
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154 int lastIndex = 0;
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155 do {
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156 String pair;
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157 int sp = _extras.indexOf('\0', lastIndex);
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158 if (sp == -1) {
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159 sp = _extras.length();
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160 }
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161 if (sp > lastIndex) {
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162 pair = _extras.substring(lastIndex, sp);
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163 pair = decode(pair);
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164 int eq = pair.indexOf(':');
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165 _extrasMap.put(pair.substring(0, eq), pair.substring(eq + 1));
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166 lastIndex = sp + 1;
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167 }
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168 } while (lastIndex < _extras.length());
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169 if (!_extrasMap.containsKey(extras_branch_key)) {
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170 _extrasMap.put(extras_branch_key, HgRepository.DEFAULT_BRANCH_NAME);
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171 }
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172 return Collections.unmodifiableMap(_extrasMap);
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173 }
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174
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175 private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) {
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176 for (int i = startOffset; i < endIndex; i++) {
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177 if (src[i] == what) {
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178 return i;
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179 }
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180 }
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181 return -1;
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182 }
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183
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184 private static String decode(String s) {
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185 if (s != null && s.indexOf('\\') != -1) {
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186 // TestAuxUtilities#testChangelogExtrasDecode
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187 return s.replace("\\\\", "\\").replace("\\n", "\n").replace("\\r", "\r").replace("\\0", "\00");
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188 }
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189 return s;
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190 }
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191
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192 public interface CsetFactory {
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193 public RawChangeset create(Nodeid nodeid, String user, Date time, int timezone, List<String> files, String comment, Map<String, String> extrasMap);
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194 }
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195 }