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annotate src/org/tmatesoft/hg/internal/FileRevisionHistoryChunk.java @ 699:a483b2b68a2e

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Provisional APIs and respective implementation for http, https and ssh remote repositories
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 08 Aug 2013 19:18:50 +0200
parents 72fc7774b87e
children
rev   line source
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1 /*
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2 * Copyright (c) 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 static org.tmatesoft.hg.core.HgIterateDirection.OldToNew;
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20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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22
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23 import java.util.Arrays;
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24 import java.util.BitSet;
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25 import java.util.LinkedList;
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26
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27 import org.tmatesoft.hg.core.HgIterateDirection;
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28 import org.tmatesoft.hg.repo.HgDataFile;
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29 import org.tmatesoft.hg.repo.HgRepository;
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30 import org.tmatesoft.hg.repo.HgRuntimeException;
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32 /**
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33 * Piece of file history, identified by path, limited to file revisions from range [chop..init] of changesets,
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34 * can be linked to another piece.
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public final class FileRevisionHistoryChunk {
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40 private final HgDataFile df;
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41 // change ancestry, sequence of file revisions
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42 private IntVector fileRevsToVisit;
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43 // parent pairs of complete file history, index offset by fileRevFrom
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44 private IntVector fileParentRevs;
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45 // map file revision to changelog revision (sparse array, only file revisions to visit are set), index offset by fileRevFrom
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46 private int[] file2changelog;
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47 private int originChangelogRev = BAD_REVISION, originFileRev = BAD_REVISION;
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48 private final int csetFrom, csetTo;
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49 private final int fileRevFrom, fileRevTo;
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51
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52 public FileRevisionHistoryChunk(HgDataFile file, int csetStart, int csetEnd, int fileStart, int fileEnd) {
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53 assert fileEnd >= fileStart;
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54 df = file;
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55 csetFrom = csetStart;
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56 csetTo = csetEnd;
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57 fileRevFrom = fileStart;
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58 fileRevTo = fileEnd;
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59 }
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60
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61 /**
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62 * @return file at this specific chunk of history (i.e. its path may be different from the paths of other chunks)
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63 */
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64 public HgDataFile getFile() {
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65 return df;
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66 }
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67
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68 /**
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69 * @return changeset this file history chunk was chopped at, or {@link HgRepository#NO_REVISION} if none specified
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70 */
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71 public int getStartChangeset() {
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72 return csetFrom;
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73 }
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74
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75 /**
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76 * @return changeset this file history chunk ends at
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77 */
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78 public int getEndChangeset() {
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79 return csetTo;
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80 }
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81
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82 public void init() throws HgRuntimeException {
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83 int[] fileRevParents = new int[2];
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84 final int totalFileRevs = fileRevTo - fileRevFrom + 1;
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85 fileParentRevs = new IntVector(totalFileRevs * 2, 0);
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86 // pretend parents of fileRevStart are not set, regardless of actual state as we are not going to visit them anyway
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87 fileParentRevs.add(NO_REVISION, NO_REVISION);
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88 // XXX df.indexWalk(fileRevStart, fileRevEnd, ) might be more effective
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89 for (int i = fileRevFrom+1; i <= fileRevTo; i++) {
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90 df.parents(i, fileRevParents, null, null);
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91 fileParentRevs.add(fileRevParents[0], fileRevParents[1]);
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92 }
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93 // fileRevsToVisit keep file change ancestry from new to old
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94 fileRevsToVisit = new IntVector(totalFileRevs, 0);
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95 // keep map of file revision to changelog revision
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96 file2changelog = new int[totalFileRevs];
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97 // only elements worth visit would get mapped, so there would be unfilled areas in the file2changelog,
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98 // prevent from error (make it explicit) by bad value
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99 Arrays.fill(file2changelog, BAD_REVISION);
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100 LinkedList<Integer> queue = new LinkedList<Integer>();
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101 BitSet seen = new BitSet(totalFileRevs);
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102 queue.add(fileRevTo);
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103 do {
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104 int fileRev = queue.removeFirst();
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105 int offFileRev = fileRev - fileRevFrom;
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106 if (seen.get(offFileRev)) {
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107 continue;
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108 }
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109 seen.set(offFileRev);
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110 int csetRev = df.getChangesetRevisionIndex(fileRev);
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111 if (csetRev < csetFrom || csetRev > csetTo) {
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112 continue;
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113 }
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114 fileRevsToVisit.add(fileRev);
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115
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116 file2changelog[offFileRev] = csetRev;
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117 int p1 = fileParentRevs.get(2*offFileRev);
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118 int p2 = fileParentRevs.get(2*offFileRev + 1);
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119 if (p1 != NO_REVISION && p1 >= fileRevFrom) {
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120 queue.addLast(p1);
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121 }
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122 if (p2 != NO_REVISION && p2 >= fileRevFrom) {
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123 queue.addLast(p2);
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124 }
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125 } while (!queue.isEmpty());
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126 // make sure no child is processed before we handled all (grand-)parents of the element
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127 fileRevsToVisit.sort(false);
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128 }
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129
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130 public void linkTo(FileRevisionHistoryChunk next) {
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131 // assume that init() has been called already
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132 if (next == null) {
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133 return;
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134 }
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135 next.originFileRev = fileRevsToVisit.get(0); // files to visit are new to old
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136 next.originChangelogRev = changeset(next.originFileRev);
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137 }
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138
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139 public int[] fileRevisions(HgIterateDirection iterateOrder) {
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140 // fileRevsToVisit is { r10, r7, r6, r5, r0 }, new to old
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141 int[] rv = fileRevsToVisit.toArray();
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142 if (iterateOrder == OldToNew) {
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143 // reverse return value
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144 for (int a = 0, b = rv.length-1; a < b; a++, b--) {
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145 int t = rv[b];
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146 rv[b] = rv[a];
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147 rv[a] = t;
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148 }
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149 }
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150 return rv;
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151 }
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152
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153 /**
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154 * @return number of file revisions in this chunk of its history
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155 */
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156 public int revisionCount() {
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157 return fileRevsToVisit.size();
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158 }
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159
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160 public int changeset(int fileRevIndex) {
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161 return file2changelog[fileRevIndex - fileRevFrom];
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162 }
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163
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164 public void fillFileParents(int fileRevIndex, int[] fileParents) {
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165 if (fileRevIndex == fileRevFrom && originFileRev != BAD_REVISION) {
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166 // this chunk continues another file
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167 assert originFileRev != NO_REVISION;
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168 fileParents[0] = originFileRev;
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169 fileParents[1] = NO_REVISION;
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170 return;
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171 }
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172 int x = fileRevIndex - fileRevFrom;
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173 fileParents[0] = fileParentRevs.get(x * 2);
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174 fileParents[1] = fileParentRevs.get(x * 2 + 1);
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175 }
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176
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177 public void fillCsetParents(int fileRevIndex, int[] csetParents) {
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178 if (fileRevIndex == fileRevFrom && originFileRev != BAD_REVISION) {
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179 assert originChangelogRev != NO_REVISION;
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180 csetParents[0] = originChangelogRev;
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181 csetParents[1] = NO_REVISION; // I wonder if possible to start a copy with two parents?
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182 return;
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183 }
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184 int x = fileRevIndex - fileRevFrom;
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185 int fp1 = fileParentRevs.get(x * 2);
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186 int fp2 = fileParentRevs.get(x * 2 + 1);
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187 csetParents[0] = fp1 == NO_REVISION ? NO_REVISION : changeset(fp1);
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188 csetParents[1] = fp2 == NO_REVISION ? NO_REVISION : changeset(fp2);
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189 }
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190 }