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annotate src/org/tmatesoft/hg/internal/BundleGenerator.java @ 667:fba85bc1dfb8

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Refactoring: move all encoding/decoding operations into single place, EncodingHelper
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 11 Jul 2013 17:54:08 +0200
parents 6e98d34eaca8
children d25f0324a27a
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.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.HgBundle;
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39 import org.tmatesoft.hg.repo.HgChangelog;
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40 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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41 import org.tmatesoft.hg.repo.HgDataFile;
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42 import org.tmatesoft.hg.repo.HgInternals;
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43 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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44 import org.tmatesoft.hg.repo.HgLookup;
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45 import org.tmatesoft.hg.repo.HgManifest;
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46 import org.tmatesoft.hg.repo.HgRepository;
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47 import org.tmatesoft.hg.repo.HgRuntimeException;
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48
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49 /**
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50 * @see http://mercurial.selenic.com/wiki/BundleFormat
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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 class BundleGenerator {
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55
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56 private final Internals repo;
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57
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58 public BundleGenerator(Internals hgRepo) {
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59 repo = hgRepo;
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60 }
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61
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62 public File create(List<Nodeid> changesets) throws HgIOException, IOException {
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63 final HgChangelog clog = repo.getRepo().getChangelog();
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64 final HgManifest manifest = repo.getRepo().getManifest();
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65 IntVector clogRevsVector = new IntVector(changesets.size(), 0);
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66 for (Nodeid n : changesets) {
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67 clogRevsVector.add(clog.getRevisionIndex(n));
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68 }
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69 clogRevsVector.sort(true);
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70 final int[] clogRevs = clogRevsVector.toArray();
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71 final IntMap<Nodeid> clogMap = new IntMap<Nodeid>(changesets.size());
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72 final IntVector manifestRevs = new IntVector(changesets.size(), 0);
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73 final List<HgDataFile> files = new ArrayList<HgDataFile>();
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74 clog.range(new HgChangelog.Inspector() {
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75 private Set<String> seenFiles = new HashSet<String>();
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76 public void next(int revisionIndex, Nodeid nodeid, RawChangeset cset) throws HgRuntimeException {
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77 clogMap.put(revisionIndex, nodeid);
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78 manifestRevs.add(manifest.getRevisionIndex(cset.manifest()));
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79 for (String f : cset.files()) {
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80 if (seenFiles.contains(f)) {
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81 continue;
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82 }
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83 seenFiles.add(f);
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84 HgDataFile df = repo.getRepo().getFileNode(f);
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85 files.add(df);
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86 }
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87 }
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88 }, clogRevs);
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89 manifestRevs.sort(true);
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90 //
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91 final File bundleFile = File.createTempFile("hg4j-", ".bundle");
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92 final FileOutputStream osBundle = new FileOutputStream(bundleFile);
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93 final OutputStreamSerializer outRaw = new OutputStreamSerializer(osBundle);
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94 outRaw.write("HG10UN".getBytes(), 0, 6);
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95 //
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96 RevlogStream clogStream = repo.getImplAccess().getChangelogStream();
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97 new ChunkGenerator(outRaw, clogMap).iterate(clogStream, clogRevs);
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98 outRaw.writeInt(0); // null chunk for changelog group
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99 //
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100 RevlogStream manifestStream = repo.getImplAccess().getManifestStream();
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101 new ChunkGenerator(outRaw, clogMap).iterate(manifestStream, manifestRevs.toArray(true));
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102 outRaw.writeInt(0); // null chunk for manifest group
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103 //
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104 EncodingHelper fnEncoder = repo.buildFileNameEncodingHelper();
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105 for (HgDataFile df : sortedByName(files)) {
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106 RevlogStream s = repo.getImplAccess().getStream(df);
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107 final IntVector fileRevs = new IntVector();
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108 s.iterate(0, TIP, false, new RevlogStream.Inspector() {
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109
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110 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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111 if (Arrays.binarySearch(clogRevs, linkRevision) >= 0) {
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112 fileRevs.add(revisionIndex);
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113 }
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114 }
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115 });
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116 fileRevs.sort(true);
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117 if (!fileRevs.isEmpty()) {
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118 // although BundleFormat page says "filename length, filename" for a file,
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119 // in fact there's a sort of 'filename chunk', i.e. filename length field includes
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120 // not only length of filename, but also length of the field itseld, i.e. filename.length+sizeof(int)
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121 byte[] fnameBytes = fnEncoder.toBundle(df.getPath());
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122 outRaw.writeInt(fnameBytes.length + 4);
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123 outRaw.writeByte(fnameBytes);
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124 new ChunkGenerator(outRaw, clogMap).iterate(s, fileRevs.toArray(true));
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125 outRaw.writeInt(0); // null chunk for file group
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126 }
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127 }
645
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128 outRaw.writeInt(0); // null chunk to indicate no more files (although BundleFormat page doesn't mention this)
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129 outRaw.done();
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130 osBundle.flush();
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131 osBundle.close();
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132 //return new HgBundle(repo.getSessionContext(), repo.getDataAccess(), bundleFile);
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133 return bundleFile;
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134 }
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135
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136 private static Collection<HgDataFile> sortedByName(List<HgDataFile> files) {
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137 Collections.sort(files, new Comparator<HgDataFile>() {
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138
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139 public int compare(HgDataFile o1, HgDataFile o2) {
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140 return o1.getPath().compareTo(o2.getPath());
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141 }
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142 });
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143 return files;
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144 }
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145
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146
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147 public static void main(String[] args) throws Exception {
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148 final HgLookup hgLookup = new HgLookup();
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149 HgRepository hgRepo = hgLookup.detectFromWorkingDir();
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150 BundleGenerator bg = new BundleGenerator(HgInternals.getImplementationRepo(hgRepo));
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151 ArrayList<Nodeid> l = new ArrayList<Nodeid>();
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152 l.add(Nodeid.fromAscii("9ef1fab9f5e3d51d70941121dc27410e28069c2d")); // 640
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153 l.add(Nodeid.fromAscii("2f33f102a8fa59274a27ebbe1c2903cecac6c5d5")); // 639
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154 l.add(Nodeid.fromAscii("d074971287478f69ab0a64176ce2284d8c1e91c3")); // 638
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155 File bundleFile = bg.create(l);
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156 HgBundle b = hgLookup.loadBundle(bundleFile);
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157 // Bundle.dump(b); // FIXME dependency from dependant code
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158 }
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159
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160 private static class ChunkGenerator implements RevlogStream.Inspector {
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161
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162 private final DataSerializer ds;
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163 private final IntMap<Nodeid> parentMap;
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164 private final IntMap<Nodeid> clogMap;
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165 private byte[] prevContent;
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166 private int startParent;
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167
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168 public ChunkGenerator(DataSerializer dataSerializer, IntMap<Nodeid> clogNodeidMap) {
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169 ds = dataSerializer;
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170 parentMap = new IntMap<Nodeid>(clogNodeidMap.size());
644
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171 clogMap = clogNodeidMap;
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172 }
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173
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174 public void iterate(RevlogStream s, int[] revisions) throws HgRuntimeException {
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175 int[] p = s.parents(revisions[0], new int[2]);
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176 startParent = p[0];
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177 int[] revs2read;
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178 if (startParent == NO_REVISION) {
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179 revs2read = revisions;
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180 prevContent = new byte[0];
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181 } else {
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182 revs2read = new int[revisions.length + 1];
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183 revs2read[0] = startParent;
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184 System.arraycopy(revisions, 0, revs2read, 1, revisions.length);
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185 }
651
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186 // FIXME this is a hack to fill parentsMap with
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187 // parents of elements that we are not going to meet with regular
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188 // iteration, e.g. changes from a different branch (with some older parent),
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189 // scenario: two revisions added to two different branches
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190 // revisions[10, 11], parents(10) == 9, parents(11) == 7
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191 // revs2read == [9,10,11], and parentsMap lacks entry for parent rev7.
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192 fillMissingParentsMap(s, revisions);
644
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193 s.iterate(revs2read, true, this);
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194 }
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195
651
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196 private void fillMissingParentsMap(RevlogStream s, int[] revisions) throws HgRuntimeException {
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197 int[] p = new int[2];
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198 for (int i = 1; i < revisions.length; i++) {
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199 s.parents(revisions[i], p);
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200 if (p[0] != NO_REVISION && Arrays.binarySearch(revisions, p[0]) < 0) {
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201 parentMap.put(p[0], Nodeid.fromBinary(s.nodeid(p[0]), 0));
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202 }
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203 if (p[1] != NO_REVISION && Arrays.binarySearch(revisions, p[1]) < 0) {
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204 parentMap.put(p[1], Nodeid.fromBinary(s.nodeid(p[1]), 0));
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205 }
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206 }
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207 }
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208
644
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209 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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210 try {
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211 parentMap.put(revisionIndex, Nodeid.fromBinary(nodeid, 0));
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212 byte[] nextContent = data.byteArray();
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213 data.done();
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214 if (revisionIndex == startParent) {
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215 prevContent = nextContent;
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216 return;
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217 }
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218 Patch p = GeneratePatchInspector.delta(prevContent, nextContent);
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219 prevContent = nextContent;
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220 nextContent = null;
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221 PatchDataSource pds = p.new PatchDataSource();
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222 int len = pds.serializeLength() + 84;
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223 ds.writeInt(len);
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224 ds.write(nodeid, 0, Nodeid.SIZE);
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225 // TODO assert parents match those in previous group elements
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226 if (parent1Revision != NO_REVISION) {
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227 ds.writeByte(parentMap.get(parent1Revision).toByteArray());
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228 } else {
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229 ds.writeByte(Nodeid.NULL.toByteArray());
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230 }
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231 if (parent2Revision != NO_REVISION) {
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232 ds.writeByte(parentMap.get(parent2Revision).toByteArray());
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233 } else {
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234 ds.writeByte(Nodeid.NULL.toByteArray());
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235 }
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236 ds.writeByte(clogMap.get(linkRevision).toByteArray());
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237 pds.serialize(ds);
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238 } catch (IOException ex) {
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239 // XXX odd to have object with IOException to use where no checked exception is allowed
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240 throw new HgInvalidControlFileException(ex.getMessage(), ex, null);
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241 } catch (HgIOException ex) {
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242 throw new HgInvalidControlFileException(ex, true); // XXX any way to refactor ChunkGenerator not to get checked exception here?
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243 }
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244 }
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245 }
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246 }