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annotate src/org/tmatesoft/hg/internal/BundleGenerator.java @ 678:8625cba0a5a8

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Towards better blame of merge revisions: refactor merge handling strategy
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Jul 2013 15:36:29 +0200
parents 52af7f62e731
children
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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.repo.HgRepository.NO_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import java.io.File;
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23 import java.io.FileOutputStream;
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24 import java.io.IOException;
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25 import java.util.ArrayList;
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26 import java.util.Arrays;
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27 import java.util.Collection;
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28 import java.util.Collections;
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29 import java.util.Comparator;
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30 import java.util.HashSet;
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31 import java.util.List;
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32 import java.util.Set;
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33
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34 import org.tmatesoft.hg.core.HgIOException;
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35 import org.tmatesoft.hg.core.Nodeid;
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36 import org.tmatesoft.hg.internal.DataSerializer.OutputStreamSerializer;
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37 import org.tmatesoft.hg.internal.Patch.PatchDataSource;
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38 import org.tmatesoft.hg.repo.HgChangelog;
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39 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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40 import org.tmatesoft.hg.repo.HgDataFile;
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41 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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42 import org.tmatesoft.hg.repo.HgManifest;
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43 import org.tmatesoft.hg.repo.HgRuntimeException;
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44
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45 /**
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46 * @see http://mercurial.selenic.com/wiki/BundleFormat
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47 * @author Artem Tikhomirov
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48 * @author TMate Software Ltd.
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49 */
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50 public class BundleGenerator {
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51
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52 private final Internals repo;
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53
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54 public BundleGenerator(Internals hgRepo) {
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55 repo = hgRepo;
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56 }
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57
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58 /**
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59 * @return never <code>null</code>. empty file if no changesets were written
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60 */
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61 public File create(List<Nodeid> changesets) throws HgIOException, IOException {
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62 final HgChangelog clog = repo.getRepo().getChangelog();
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63 final HgManifest manifest = repo.getRepo().getManifest();
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64 IntVector clogRevsVector = new IntVector(changesets.size(), 0);
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65 for (Nodeid n : changesets) {
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66 clogRevsVector.add(clog.getRevisionIndex(n));
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67 }
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68 clogRevsVector.sort(true);
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69 final int[] clogRevs = clogRevsVector.toArray();
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70 final IntMap<Nodeid> clogMap = new IntMap<Nodeid>(changesets.size());
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71 final IntVector manifestRevs = new IntVector(changesets.size(), 0);
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72 final List<HgDataFile> files = new ArrayList<HgDataFile>();
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73 clog.range(new HgChangelog.Inspector() {
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74 private Set<String> seenFiles = new HashSet<String>();
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75 public void next(int revisionIndex, Nodeid nodeid, RawChangeset cset) throws HgRuntimeException {
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76 clogMap.put(revisionIndex, nodeid);
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77 manifestRevs.add(manifest.getRevisionIndex(cset.manifest()));
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78 for (String f : cset.files()) {
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79 if (seenFiles.contains(f)) {
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80 continue;
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81 }
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82 seenFiles.add(f);
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83 HgDataFile df = repo.getRepo().getFileNode(f);
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84 files.add(df);
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85 }
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86 }
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87 }, clogRevs);
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88 manifestRevs.sort(true);
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89 //
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90 final File bundleFile = File.createTempFile("hg4j-", ".bundle");
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91 if (clogRevs.length == 0) {
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92 // nothing to write
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93 return bundleFile;
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94 }
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95 final FileOutputStream osBundle = new FileOutputStream(bundleFile);
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96 final OutputStreamSerializer outRaw = new OutputStreamSerializer(osBundle);
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97 outRaw.write("HG10UN".getBytes(), 0, 6);
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98 //
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99 RevlogStream clogStream = repo.getImplAccess().getChangelogStream();
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100 new ChunkGenerator(outRaw, clogMap).iterate(clogStream, clogRevs);
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101 outRaw.writeInt(0); // null chunk for changelog group
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102 //
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103 RevlogStream manifestStream = repo.getImplAccess().getManifestStream();
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104 new ChunkGenerator(outRaw, clogMap).iterate(manifestStream, manifestRevs.toArray(true));
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105 outRaw.writeInt(0); // null chunk for manifest group
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106 //
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107 EncodingHelper fnEncoder = repo.buildFileNameEncodingHelper();
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108 for (HgDataFile df : sortedByName(files)) {
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109 RevlogStream s = repo.getImplAccess().getStream(df);
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110 final IntVector fileRevs = new IntVector();
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111 s.iterate(0, TIP, false, new RevlogStream.Inspector() {
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112
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113 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) throws HgRuntimeException {
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114 if (Arrays.binarySearch(clogRevs, linkRevision) >= 0) {
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115 fileRevs.add(revisionIndex);
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116 }
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117 }
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118 });
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119 fileRevs.sort(true);
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120 if (!fileRevs.isEmpty()) {
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121 // although BundleFormat page says "filename length, filename" for a file,
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122 // in fact there's a sort of 'filename chunk', i.e. filename length field includes
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123 // not only length of filename, but also length of the field itseld, i.e. filename.length+sizeof(int)
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124 byte[] fnameBytes = fnEncoder.toBundle(df.getPath());
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125 outRaw.writeInt(fnameBytes.length + 4);
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126 outRaw.writeByte(fnameBytes);
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127 new ChunkGenerator(outRaw, clogMap).iterate(s, fileRevs.toArray(true));
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128 outRaw.writeInt(0); // null chunk for file group
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129 }
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130 }
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131 outRaw.writeInt(0); // null chunk to indicate no more files (although BundleFormat page doesn't mention this)
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132 outRaw.done();
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133 osBundle.flush();
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134 osBundle.close();
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135 //return new HgBundle(repo.getSessionContext(), repo.getDataAccess(), bundleFile);
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136 return bundleFile;
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137 }
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138
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139 private static Collection<HgDataFile> sortedByName(List<HgDataFile> files) {
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140 Collections.sort(files, new Comparator<HgDataFile>() {
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141
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142 public int compare(HgDataFile o1, HgDataFile o2) {
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143 return o1.getPath().compareTo(o2.getPath());
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144 }
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145 });
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146 return files;
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147 }
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148
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149 private static class ChunkGenerator implements RevlogStream.Inspector {
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150
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151 private final DataSerializer ds;
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152 private final IntMap<Nodeid> parentMap;
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153 private final IntMap<Nodeid> clogMap;
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154 private byte[] prevContent;
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155 private int startParent;
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156
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157 public ChunkGenerator(DataSerializer dataSerializer, IntMap<Nodeid> clogNodeidMap) {
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158 ds = dataSerializer;
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159 parentMap = new IntMap<Nodeid>(clogNodeidMap.size());
644
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160 clogMap = clogNodeidMap;
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161 }
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162
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163 public void iterate(RevlogStream s, int[] revisions) throws HgRuntimeException {
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164 int[] p = s.parents(revisions[0], new int[2]);
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165 startParent = p[0];
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166 int[] revs2read;
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167 if (startParent == NO_REVISION) {
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168 revs2read = revisions;
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169 prevContent = new byte[0];
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170 } else {
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171 revs2read = new int[revisions.length + 1];
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172 revs2read[0] = startParent;
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173 System.arraycopy(revisions, 0, revs2read, 1, revisions.length);
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174 }
651
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175 // FIXME this is a hack to fill parentsMap with
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176 // parents of elements that we are not going to meet with regular
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177 // iteration, e.g. changes from a different branch (with some older parent),
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178 // scenario: two revisions added to two different branches
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179 // revisions[10, 11], parents(10) == 9, parents(11) == 7
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180 // revs2read == [9,10,11], and parentsMap lacks entry for parent rev7.
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181 fillMissingParentsMap(s, revisions);
644
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182 s.iterate(revs2read, true, this);
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183 }
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184
651
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185 private void fillMissingParentsMap(RevlogStream s, int[] revisions) throws HgRuntimeException {
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186 int[] p = new int[2];
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187 for (int i = 1; i < revisions.length; i++) {
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188 s.parents(revisions[i], p);
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189 if (p[0] != NO_REVISION && Arrays.binarySearch(revisions, p[0]) < 0) {
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190 parentMap.put(p[0], Nodeid.fromBinary(s.nodeid(p[0]), 0));
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191 }
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192 if (p[1] != NO_REVISION && Arrays.binarySearch(revisions, p[1]) < 0) {
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193 parentMap.put(p[1], Nodeid.fromBinary(s.nodeid(p[1]), 0));
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194 }
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195 }
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196 }
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197
644
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198 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) throws HgRuntimeException {
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199 try {
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200 parentMap.put(revisionIndex, Nodeid.fromBinary(nodeid, 0));
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201 byte[] nextContent = data.byteArray();
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202 data.done();
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203 if (revisionIndex == startParent) {
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204 prevContent = nextContent;
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205 return;
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206 }
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207 Patch p = GeneratePatchInspector.delta(prevContent, nextContent);
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208 prevContent = nextContent;
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209 nextContent = null;
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210 PatchDataSource pds = p.new PatchDataSource();
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211 int len = pds.serializeLength() + 84;
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212 ds.writeInt(len);
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213 ds.write(nodeid, 0, Nodeid.SIZE);
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214 if (parent1Revision != NO_REVISION) {
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215 ds.writeByte(parentMap.get(parent1Revision).toByteArray());
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216 } else {
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217 ds.writeByte(Nodeid.NULL.toByteArray());
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218 }
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219 if (parent2Revision != NO_REVISION) {
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220 ds.writeByte(parentMap.get(parent2Revision).toByteArray());
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221 } else {
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222 ds.writeByte(Nodeid.NULL.toByteArray());
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223 }
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224 ds.writeByte(clogMap.get(linkRevision).toByteArray());
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225 pds.serialize(ds);
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226 } catch (IOException ex) {
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227 // XXX odd to have object with IOException to use where no checked exception is allowed
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228 throw new HgInvalidControlFileException(ex.getMessage(), ex, null);
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229 } catch (HgIOException ex) {
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230 throw new HgInvalidControlFileException(ex, true); // XXX any way to refactor ChunkGenerator not to get checked exception here?
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231 }
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232 }
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233 }
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234 }