annotate src/org/tmatesoft/hg/internal/FileRevisionHistoryChunk.java @ 612:dca70c0b1f74

Test tags, branches and hgingore information get refreshed on external (and/or internal) change
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 10 May 2013 14:29:35 +0200
parents 43cfa08ff3fd
children b4948b159ab1
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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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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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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27 import org.tmatesoft.hg.core.HgIterateDirection;
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28 import org.tmatesoft.hg.core.Nodeid;
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29 import org.tmatesoft.hg.repo.HgDataFile;
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30 import org.tmatesoft.hg.repo.HgRepository;
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31
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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
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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)
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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 int csetRangeStart = NO_REVISION, csetRangeEnd = BAD_REVISION;
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49
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51 public FileRevisionHistoryChunk(HgDataFile file) {
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52 df = file;
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53 }
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54
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55 /**
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56 * @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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57 */
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58 public HgDataFile getFile() {
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59 return df;
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60 }
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61
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62 /**
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63 * @return changeset this file history chunk was chopped at, or {@link HgRepository#NO_REVISION} if none specified
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64 */
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65 public int getStartChangeset() {
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66 return csetRangeStart;
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67 }
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68
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69 /**
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70 * @return changeset this file history chunk ends at
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71 */
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72 public int getEndChangeset() {
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73 return csetRangeEnd;
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74 }
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75
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76 public void init(int changelogRevisionIndex) {
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77 csetRangeEnd = changelogRevisionIndex;
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78 // XXX df.indexWalk(0, fileRevIndex, ) might be more effective
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79 Nodeid fileRev = df.getRepo().getManifest().getFileRevision(changelogRevisionIndex, df.getPath());
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80 int fileRevIndex = df.getRevisionIndex(fileRev);
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81 int[] fileRevParents = new int[2];
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82 fileParentRevs = new IntVector((fileRevIndex+1) * 2, 0);
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83 fileParentRevs.add(NO_REVISION, NO_REVISION); // parents of fileRevIndex == 0
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84 for (int i = 1; i <= fileRevIndex; i++) {
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85 df.parents(i, fileRevParents, null, null);
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86 fileParentRevs.add(fileRevParents[0], fileRevParents[1]);
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87 }
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88 // fileRevsToVisit keep file change ancestry from new to old
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89 fileRevsToVisit = new IntVector(fileRevIndex + 1, 0);
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90 // keep map of file revision to changelog revision
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91 file2changelog = new int[fileRevIndex+1];
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92 // only elements worth visit would get mapped, so there would be unfilled areas in the file2changelog,
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93 // prevent from error (make it explicit) by bad value
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94 Arrays.fill(file2changelog, BAD_REVISION);
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95 LinkedList<Integer> queue = new LinkedList<Integer>();
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96 BitSet seen = new BitSet(fileRevIndex + 1);
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97 queue.add(fileRevIndex);
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98 do {
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99 int x = queue.removeFirst();
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100 if (seen.get(x)) {
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101 continue;
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102 }
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103 seen.set(x);
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104 fileRevsToVisit.add(x);
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105 file2changelog[x] = df.getChangesetRevisionIndex(x);
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106 int p1 = fileParentRevs.get(2*x);
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107 int p2 = fileParentRevs.get(2*x + 1);
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108 if (p1 != NO_REVISION) {
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109 queue.addLast(p1);
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110 }
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111 if (p2 != NO_REVISION) {
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112 queue.addLast(p2);
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113 }
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114 } while (!queue.isEmpty());
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115 // make sure no child is processed before we handled all (grand-)parents of the element
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116 fileRevsToVisit.sort(false);
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117 }
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118
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119 public void linkTo(FileRevisionHistoryChunk target) {
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120 // assume that target.init() has been called already
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121 if (target == null) {
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122 return;
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123 }
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124 target.originFileRev = fileRevsToVisit.get(0); // files to visit are new to old
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125 target.originChangelogRev = changeset(target.originFileRev);
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126 }
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127
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128 /**
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129 * Mark revision closest(ceil) to specified as the very first one (no parents)
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130 */
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131 public void chopAtChangeset(int firstChangelogRevOfInterest) {
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132 csetRangeStart = firstChangelogRevOfInterest;
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133 if (firstChangelogRevOfInterest == 0) {
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134 return; // nothing to do
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135 }
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136 int i = 0, x = fileRevsToVisit.size(), fileRev = BAD_REVISION;
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137 // fileRevsToVisit is new to old, greater numbers to smaller
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138 while (i < x && changeset(fileRev = fileRevsToVisit.get(i)) >= firstChangelogRevOfInterest) {
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139 i++;
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140 }
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141 assert fileRev != BAD_REVISION; // there's at least 1 revision in fileRevsToVisit
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142 if (i == x && changeset(fileRev) != firstChangelogRevOfInterest) {
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143 assert false : "Requested changeset shall belong to the chunk";
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144 return;
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145 }
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146 fileRevsToVisit.trimTo(i); // no need to iterate more
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147 // pretend fileRev got no parents
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148 fileParentRevs.set(fileRev * 2, NO_REVISION);
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149 fileParentRevs.set(fileRev, NO_REVISION);
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150 }
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151
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152 public int[] fileRevisions(HgIterateDirection iterateOrder) {
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153 // fileRevsToVisit is { r10, r7, r6, r5, r0 }, new to old
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154 int[] rv = fileRevsToVisit.toArray();
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155 if (iterateOrder == OldToNew) {
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156 // reverse return value
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157 for (int a = 0, b = rv.length-1; a < b; a++, b--) {
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158 int t = rv[b];
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159 rv[b] = rv[a];
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160 rv[a] = t;
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161 }
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162 }
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163 return rv;
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164 }
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165
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166 public int changeset(int fileRevIndex) {
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167 return file2changelog[fileRevIndex];
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168 }
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169
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170 public void fillFileParents(int fileRevIndex, int[] fileParents) {
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171 if (fileRevIndex == 0 && originFileRev != BAD_REVISION) {
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172 // this chunk continues another file
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173 assert originFileRev != NO_REVISION;
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174 fileParents[0] = originFileRev;
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175 fileParents[1] = NO_REVISION;
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176 return;
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177 }
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178 fileParents[0] = fileParentRevs.get(fileRevIndex * 2);
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179 fileParents[1] = fileParentRevs.get(fileRevIndex * 2 + 1);
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180 }
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181
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182 public void fillCsetParents(int fileRevIndex, int[] csetParents) {
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183 if (fileRevIndex == 0 && originFileRev != BAD_REVISION) {
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184 assert originFileRev != NO_REVISION;
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185 csetParents[0] = originChangelogRev;
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186 csetParents[1] = NO_REVISION; // I wonder if possible to start a copy with two parents?
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187 return;
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188 }
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189 int fp1 = fileParentRevs.get(fileRevIndex * 2);
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190 int fp2 = fileParentRevs.get(fileRevIndex * 2 + 1);
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191 csetParents[0] = fp1 == NO_REVISION ? NO_REVISION : changeset(fp1);
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192 csetParents[1] = fp2 == NO_REVISION ? NO_REVISION : changeset(fp2);
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193 }
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194 }