Mercurial > jhg

annotate src/org/tmatesoft/hg/internal/FileRevisionHistoryChunk.java @ 697:24f4efedc9d5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Respect the fact ssh and http protocols use different compression approach to sent changegroup data
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 06 Aug 2013 13:34:34 +0200
parents 72fc7774b87e
children
rev   line source
596
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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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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, 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 }