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annotate src/org/tmatesoft/hg/internal/CommitFacility.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 4ffc17c0b534
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.DEFAULT_BRANCH_NAME;
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20 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepositoryFiles.*;
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22 import static org.tmatesoft.hg.util.LogFacility.Severity.Error;
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23
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24 import java.io.File;
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25 import java.io.FileOutputStream;
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26 import java.io.FileWriter;
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27 import java.io.IOException;
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28 import java.nio.ByteBuffer;
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29 import java.util.ArrayList;
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30 import java.util.HashMap;
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31 import java.util.LinkedHashMap;
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32 import java.util.Map;
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33 import java.util.Set;
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34 import java.util.TreeMap;
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35 import java.util.TreeSet;
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36
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37 import org.tmatesoft.hg.core.HgCommitCommand;
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38 import org.tmatesoft.hg.core.HgIOException;
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39 import org.tmatesoft.hg.core.HgRepositoryLockException;
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40 import org.tmatesoft.hg.core.Nodeid;
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41 import org.tmatesoft.hg.internal.DataSerializer.ByteArraySerializer;
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42 import org.tmatesoft.hg.internal.DataSerializer.DataSource;
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43 import org.tmatesoft.hg.repo.HgChangelog;
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44 import org.tmatesoft.hg.repo.HgDataFile;
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45 import org.tmatesoft.hg.repo.HgPhase;
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46 import org.tmatesoft.hg.repo.HgRuntimeException;
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47 import org.tmatesoft.hg.util.ByteChannel;
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48 import org.tmatesoft.hg.util.CancelledException;
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49 import org.tmatesoft.hg.util.Pair;
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50 import org.tmatesoft.hg.util.Path;
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51
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52 /**
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53 * Name: CommitObject, FutureCommit or PendingCommit
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54 * The only public API now: {@link HgCommitCommand}.
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55 *
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56 * @author Artem Tikhomirov
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57 * @author TMate Software Ltd.
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58 */
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59 public final class CommitFacility {
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60 private final Internals repo;
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61 private final int p1Commit, p2Commit;
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62 private Map<Path, Pair<HgDataFile, DataSource>> files = new LinkedHashMap<Path, Pair<HgDataFile, DataSource>>();
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63 private Set<Path> removals = new TreeSet<Path>();
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64 private String branch, user;
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65
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66 public CommitFacility(Internals hgRepo, int parentCommit) {
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67 this(hgRepo, parentCommit, NO_REVISION);
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68 }
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69
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70 public CommitFacility(Internals hgRepo, int parent1Commit, int parent2Commit) {
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71 repo = hgRepo;
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72 p1Commit = parent1Commit;
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73 p2Commit = parent2Commit;
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74 if (parent1Commit != NO_REVISION && parent1Commit == parent2Commit) {
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75 throw new IllegalArgumentException("Merging same revision is dubious");
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76 }
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77 }
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78
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79 public boolean isMerge() {
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80 return p1Commit != NO_REVISION && p2Commit != NO_REVISION;
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81 }
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82
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83 public void add(HgDataFile dataFile, DataSource content) {
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84 if (content == null) {
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85 throw new IllegalArgumentException();
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86 }
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87 removals.remove(dataFile.getPath());
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88 files.put(dataFile.getPath(), new Pair<HgDataFile, DataSource>(dataFile, content));
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89 }
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90
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91 public void forget(HgDataFile dataFile) {
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92 files.remove(dataFile.getPath());
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93 removals.add(dataFile.getPath());
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94 }
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95
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96 public void branch(String branchName) {
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97 branch = branchName;
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98 }
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99
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100 public void user(String userName) {
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101 user = userName;
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102 }
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103
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104 // this method doesn't roll transaction back in case of failure, caller's responsibility
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105 // this method expects repository to be locked, if needed
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106 public Nodeid commit(String message, Transaction transaction) throws HgIOException, HgRepositoryLockException, HgRuntimeException {
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107 final HgChangelog clog = repo.getRepo().getChangelog();
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108 final int clogRevisionIndex = clog.getRevisionCount();
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109 ManifestRevision c1Manifest = new ManifestRevision(null, null);
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110 ManifestRevision c2Manifest = new ManifestRevision(null, null);
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111 final Nodeid p1Cset = p1Commit == NO_REVISION ? null : clog.getRevision(p1Commit);
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112 final Nodeid p2Cset = p2Commit == NO_REVISION ? null : clog.getRevision(p2Commit);
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113 if (p1Commit != NO_REVISION) {
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114 repo.getRepo().getManifest().walk(p1Commit, p1Commit, c1Manifest);
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115 }
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116 if (p2Commit != NO_REVISION) {
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117 repo.getRepo().getManifest().walk(p2Commit, p2Commit, c2Manifest);
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118 }
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119 // Pair<Integer, Integer> manifestParents = getManifestParents();
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120 Pair<Integer, Integer> manifestParents = new Pair<Integer, Integer>(c1Manifest.revisionIndex(), c2Manifest.revisionIndex());
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121 TreeMap<Path, Nodeid> newManifestRevision = new TreeMap<Path, Nodeid>();
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122 HashMap<Path, Pair<Integer, Integer>> fileParents = new HashMap<Path, Pair<Integer,Integer>>();
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123 for (Path f : c1Manifest.files()) {
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124 HgDataFile df = repo.getRepo().getFileNode(f);
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125 Nodeid fileKnownRev1 = c1Manifest.nodeid(f), fileKnownRev2;
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126 final int fileRevIndex1 = df.getRevisionIndex(fileKnownRev1);
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127 final int fileRevIndex2;
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128 if ((fileKnownRev2 = c2Manifest.nodeid(f)) != null) {
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129 // merged files
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130 fileRevIndex2 = df.getRevisionIndex(fileKnownRev2);
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131 } else {
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132 fileRevIndex2 = NO_REVISION;
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133 }
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134
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135 fileParents.put(f, new Pair<Integer, Integer>(fileRevIndex1, fileRevIndex2));
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136 newManifestRevision.put(f, fileKnownRev1);
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137 }
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138 //
559
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139 // Forget removed
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140 for (Path p : removals) {
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141 newManifestRevision.remove(p);
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142 }
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143 //
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144 saveCommitMessage(message);
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145 //
559
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146 // Register new/changed
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147 FNCacheFile.Mediator fncache = new FNCacheFile.Mediator(repo, transaction);
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148 ArrayList<Path> touchInDirstate = new ArrayList<Path>();
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149 for (Pair<HgDataFile, DataSource> e : files.values()) {
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150 HgDataFile df = e.first();
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151 DataSource bds = e.second();
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152 Pair<Integer, Integer> fp = fileParents.get(df.getPath());
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153 if (fp == null) {
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154 // NEW FILE, either just added or resurrected from p2
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155 Nodeid fileRevInP2;
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156 if ((fileRevInP2 = c2Manifest.nodeid(df.getPath())) != null) {
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157 fp = new Pair<Integer, Integer>(df.getRevisionIndex(fileRevInP2), NO_REVISION);
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158 } else {
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159 // brand new
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160 fp = new Pair<Integer, Integer>(NO_REVISION, NO_REVISION);
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161 }
538
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162 }
708
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163 // TODO if fp.first() != NO_REVISION and fp.second() != NO_REVISION check if one
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164 // revision is ancestor of another and use the latest as p1, then
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165 Nodeid fileRev = null;
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166 final boolean isNewFile = !df.exists();
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167 if (fp.first() != NO_REVISION && fp.second() == NO_REVISION && !isNewFile) {
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168 // compare file contents to see if anything has changed, and reuse old revision, if unchanged.
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169 // XXX ineffective, need better access to revision conten
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170 ByteArraySerializer bas = new ByteArraySerializer();
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171 bds.serialize(bas);
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172 final byte[] newContent = bas.toByteArray();
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173 // unless there's a way to reset DataSource, replace it with the content just read
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174 bds = new DataSerializer.ByteArrayDataSource(newContent);
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175 if (new ComparatorChannel(newContent).same(df, fp.first())) {
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176 fileRev = df.getRevision(fp.first());
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177 }
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178 }
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179 if (fileRev == null) {
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180 RevlogStream contentStream = repo.getImplAccess().getStream(df);
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181 RevlogStreamWriter fileWriter = new RevlogStreamWriter(repo, contentStream, transaction);
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182 fileRev = fileWriter.addRevision(bds, clogRevisionIndex, fp.first(), fp.second()).second();
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183 if (isNewFile) {
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184 // registerNew shall go after fileWriter.addRevision as it needs to know if data is inlined or not
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185 fncache.registerNew(df.getPath(), contentStream);
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186 }
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187 }
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188 newManifestRevision.put(df.getPath(), fileRev);
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189 touchInDirstate.add(df.getPath());
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190 }
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191 //
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192 final EncodingHelper encHelper = repo.buildFileNameEncodingHelper();
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193 //
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194 // Manifest
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195 final ManifestEntryBuilder manifestBuilder = new ManifestEntryBuilder(encHelper);
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196 for (Map.Entry<Path, Nodeid> me : newManifestRevision.entrySet()) {
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197 manifestBuilder.add(me.getKey().toString(), me.getValue());
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198 }
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199 RevlogStreamWriter manifestWriter = new RevlogStreamWriter(repo, repo.getImplAccess().getManifestStream(), transaction);
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200 Nodeid manifestRev = manifestWriter.addRevision(manifestBuilder, clogRevisionIndex, manifestParents.first(), manifestParents.second()).second();
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201 //
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202 // Changelog
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203 final ChangelogEntryBuilder changelogBuilder = new ChangelogEntryBuilder(encHelper);
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204 changelogBuilder.setModified(files.keySet());
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205 changelogBuilder.branch(branch == null ? DEFAULT_BRANCH_NAME : branch);
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206 changelogBuilder.user(String.valueOf(user));
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207 changelogBuilder.manifest(manifestRev).comment(message);
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208 RevlogStreamWriter changelogWriter = new RevlogStreamWriter(repo, repo.getImplAccess().getChangelogStream(), transaction);
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209 Nodeid changesetRev = changelogWriter.addRevision(changelogBuilder, clogRevisionIndex, p1Commit, p2Commit).second();
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210 // TODO move dirstate and bookmark update update to an external facility
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211 fncache.complete();
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212 String oldBranchValue = DirstateReader.readBranch(repo);
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213 String newBranchValue = branch == null ? DEFAULT_BRANCH_NAME : branch;
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214 if (!oldBranchValue.equals(newBranchValue)) {
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215 // prepare undo.branch as described in http://mercurial.selenic.com/wiki/FileFormats#undo..2A
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216 File branchFile = transaction.prepare(repo.getRepositoryFile(Branch), repo.getRepositoryFile(UndoBranch));
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217 FileOutputStream fos = null;
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218 try {
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219 fos = new FileOutputStream(branchFile);
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220 fos.write(newBranchValue.getBytes(EncodingHelper.getUTF8().name())); // XXX Java 1.5
612
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221 fos.flush();
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222 fos.close();
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223 fos = null;
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224 transaction.done(branchFile);
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225 } catch (IOException ex) {
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226 transaction.failure(branchFile, ex);
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227 repo.getLog().dump(getClass(), Error, ex, "Failed to write branch information, error ignored");
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228 } finally {
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229 try {
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230 if (fos != null) {
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231 fos.close();
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232 }
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233 } catch (IOException ex) {
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234 repo.getLog().dump(getClass(), Error, ex, null);
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235 }
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236 }
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237 }
617
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238 // bring dirstate up to commit state, TODO share this code with HgAddRemoveCommand
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239 final DirstateBuilder dirstateBuilder = new DirstateBuilder(repo);
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240 dirstateBuilder.fillFrom(new DirstateReader(repo, repo.getSessionContext().getPathFactory()));
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241 for (Path p : removals) {
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242 dirstateBuilder.recordRemoved(p);
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243 }
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244 for (Path p : touchInDirstate) {
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245 dirstateBuilder.recordUncertain(p);
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246 }
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247 dirstateBuilder.parents(changesetRev, Nodeid.NULL);
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248 dirstateBuilder.serialize(transaction);
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249 // update bookmarks
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250 if (p1Commit != NO_REVISION || p2Commit != NO_REVISION) {
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251 repo.getRepo().getBookmarks().updateActive(p1Cset, p2Cset, changesetRev);
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252 }
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253 PhasesHelper phaseHelper = new PhasesHelper(repo);
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254 HgPhase newCommitPhase = HgPhase.parse(repo.getRepo().getConfiguration().getStringValue("phases", "new-commit", HgPhase.Draft.mercurialString()));
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255 phaseHelper.newCommitNode(changesetRev, newCommitPhase);
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256 // TODO Revisit: might be reasonable to send out a "Repo changed" notification, to clear
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257 // e.g. cached branch, tags and so on, not to rely on file change detection methods?
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258 // The same notification might come useful once Pull is implemented
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259 return changesetRev;
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260 }
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261
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262 private void saveCommitMessage(String message) throws HgIOException {
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263 File lastMessage = repo.getRepositoryFile(LastMessage);
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264 // do not attempt to write if we are going to fail anyway
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265 if ((lastMessage.isFile() && !lastMessage.canWrite()) || !lastMessage.getParentFile().canWrite()) {
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266 return;
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267 }
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268 FileWriter w = null;
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269 try {
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270 w = new FileWriter(lastMessage);
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271 w.write(message == null ? new String() : message);
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272 w.flush();
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273 } catch (IOException ex) {
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274 throw new HgIOException("Failed to save last commit message", ex, lastMessage);
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275 } finally {
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276 new FileUtils(repo.getLog(), this).closeQuietly(w, lastMessage);
636
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277 }
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278 }
708
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279
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280 private static class ComparatorChannel implements ByteChannel {
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281 private int index;
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282 private final byte[] content;
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283
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284 public ComparatorChannel(byte[] contentToCompare) {
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285 content = contentToCompare;
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286 }
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287
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288 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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289 int consumed = 0;
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290 while (buffer.hasRemaining()) {
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291 byte b = buffer.get();
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292 consumed++;
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293 if (content[index++] != b) {
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294 throw new CancelledException();
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295 }
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296 }
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297 return consumed;
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298 }
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299
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300 public boolean same(HgDataFile df, int fileRevIndex) {
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301 index = 0;
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302 try {
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303 df.contentWithFilters(fileRevIndex, this);
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304 return index == content.length;
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305 } catch (CancelledException ex) {
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306 // comparison failed, content differs, ok to go on
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307 }
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308 return false;
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309 }
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310 }
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311
538
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312 /*
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313 private Pair<Integer, Integer> getManifestParents() {
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314 return new Pair<Integer, Integer>(extractManifestRevisionIndex(p1Commit), extractManifestRevisionIndex(p2Commit));
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315 }
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316
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317 private int extractManifestRevisionIndex(int clogRevIndex) {
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318 if (clogRevIndex == NO_REVISION) {
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319 return NO_REVISION;
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320 }
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321 RawChangeset commitObject = repo.getChangelog().range(clogRevIndex, clogRevIndex).get(0);
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322 Nodeid manifestRev = commitObject.manifest();
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323 if (manifestRev.isNull()) {
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324 return NO_REVISION;
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325 }
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326 return repo.getManifest().getRevisionIndex(manifestRev);
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327 }
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328 */
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329 }