Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgIncomingCommand.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents 2f9ed6bcefa2
children 6526d8adbc0f
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.core;
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18
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19 import java.util.ArrayList;
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20 import java.util.HashSet;
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21 import java.util.Iterator;
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22 import java.util.LinkedHashSet;
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23 import java.util.LinkedList;
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24 import java.util.List;
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25 import java.util.Set;
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26 import java.util.TreeSet;
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27
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28 import org.tmatesoft.hg.internal.Internals;
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29 import org.tmatesoft.hg.internal.RepositoryComparator;
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30 import org.tmatesoft.hg.internal.RepositoryComparator.BranchChain;
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31 import org.tmatesoft.hg.repo.HgBundle;
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32 import org.tmatesoft.hg.repo.HgChangelog;
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33 import org.tmatesoft.hg.repo.HgChangelog.RawChangeset;
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34 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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35 import org.tmatesoft.hg.repo.HgInvalidStateException;
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36 import org.tmatesoft.hg.repo.HgRemoteRepository;
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37 import org.tmatesoft.hg.repo.HgRepository;
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38 import org.tmatesoft.hg.repo.HgRuntimeException;
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39 import org.tmatesoft.hg.repo.HgParentChildMap;
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40 import org.tmatesoft.hg.util.CancelledException;
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41 import org.tmatesoft.hg.util.ProgressSupport;
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43 /**
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44 * Command to find out changes available in a remote repository, missing locally.
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45 *
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46 * @author Artem Tikhomirov
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47 * @author TMate Software Ltd.
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48 */
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49 public class HgIncomingCommand extends HgAbstractCommand<HgIncomingCommand> {
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50
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51 private final HgRepository localRepo;
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52 private HgRemoteRepository remoteRepo;
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53 @SuppressWarnings("unused")
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54 private boolean includeSubrepo;
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55 private RepositoryComparator comparator;
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56 private List<BranchChain> missingBranches;
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57 private HgParentChildMap<HgChangelog> parentHelper;
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58 private Set<String> branches;
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60 public HgIncomingCommand(HgRepository hgRepo) {
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61 localRepo = hgRepo;
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62 }
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63
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64 public HgIncomingCommand against(HgRemoteRepository hgRemote) {
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65 remoteRepo = hgRemote;
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66 comparator = null;
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67 missingBranches = null;
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68 return this;
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69 }
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71 /**
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72 * Select specific branch to push.
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73 * Multiple branch specification possible (changeset from any of these would be included in result).
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74 * Note, {@link #executeLite()} does not respect this setting.
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75 *
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76 * @param branch - branch name, case-sensitive, non-null.
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77 * @return <code>this</code> for convenience
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78 * @throws IllegalArgumentException when branch argument is null
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79 */
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80 public HgIncomingCommand branch(String branch) {
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81 if (branch == null) {
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82 throw new IllegalArgumentException();
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83 }
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84 if (branches == null) {
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85 branches = new TreeSet<String>();
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86 }
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87 branches.add(branch);
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88 return this;
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89 }
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91 /**
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92 * PLACEHOLDER, NOT IMPLEMENTED YET.
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93 *
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94 * Whether to include sub-repositories when collecting changes, default is <code>true</code> XXX or false?
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95 * @return <code>this</code> for convenience
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96 */
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97 public HgIncomingCommand subrepo(boolean include) {
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98 includeSubrepo = include;
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99 throw Internals.notImplemented();
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100 }
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102 /**
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103 * Lightweight check for incoming changes, gives only list of revisions to pull.
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104 * Reported changes are from any branch (limits set by {@link #branch(String)} are not taken into account.
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105 *
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106 * @return list of nodes present at remote and missing locally
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107 * @throws HgRemoteConnectionException when failed to communicate with remote repository
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108 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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109 * @throws CancelledException if execution of the command was cancelled
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110 */
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111 public List<Nodeid> executeLite() throws HgException, CancelledException {
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112 try {
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113 LinkedHashSet<Nodeid> result = new LinkedHashSet<Nodeid>();
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114 RepositoryComparator repoCompare = getComparator();
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115 for (BranchChain bc : getMissingBranches()) {
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116 List<Nodeid> missing = repoCompare.visitBranches(bc);
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117 HashSet<Nodeid> common = new HashSet<Nodeid>(); // ordering is irrelevant
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118 repoCompare.collectKnownRoots(bc, common);
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119 // missing could only start with common elements. Once non-common, rest is just distinct branch revision trails.
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120 for (Iterator<Nodeid> it = missing.iterator(); it.hasNext() && common.contains(it.next()); it.remove()) ;
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121 result.addAll(missing);
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122 }
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123 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(result);
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124 return rv;
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125 } catch (HgRuntimeException ex) {
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126 throw new HgLibraryFailureException(ex);
192
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127 }
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128 }
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129
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130 /**
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131 * Full information about incoming changes
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132 *
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133 * @throws HgCallbackTargetException to re-throw exception from the handler
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134 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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135 * @throws CancelledException if execution of the command was cancelled
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136 */
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137 public void executeFull(final HgChangesetHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
192
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138 if (handler == null) {
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139 throw new IllegalArgumentException("Delegate can't be null");
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140 }
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141 final List<Nodeid> common = getCommon();
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142 HgBundle changegroup = remoteRepo.getChanges(common);
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143 final ProgressSupport ps = getProgressSupport(handler);
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144 try {
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145 final ChangesetTransformer transformer = new ChangesetTransformer(localRepo, handler, getParentHelper(), ps, getCancelSupport(handler, true));
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146 transformer.limitBranches(branches);
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147 changegroup.changes(localRepo, new HgChangelog.Inspector() {
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148 private int localIndex;
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149 private final HgParentChildMap<HgChangelog> parentHelper;
208
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150
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151 {
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152 parentHelper = getParentHelper();
208
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153 // new revisions, if any, would be added after all existing, and would get numbered started with last+1
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154 localIndex = localRepo.getChangelog().getRevisionCount();
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155 }
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156
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157 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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158 if (parentHelper.knownNode(nodeid)) {
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159 if (!common.contains(nodeid)) {
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160 throw new HgInvalidStateException("Bundle shall not report known nodes other than roots we've supplied");
192
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161 }
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162 return;
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163 }
208
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164 transformer.next(localIndex++, nodeid, cset);
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165 }
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166 });
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167 transformer.checkFailure();
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168 } catch (HgRuntimeException ex) {
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169 throw new HgLibraryFailureException(ex);
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170 } finally {
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171 ps.done();
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172 }
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173 }
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174
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175 private RepositoryComparator getComparator() throws HgInvalidControlFileException, CancelledException {
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176 if (remoteRepo == null) {
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177 throw new IllegalArgumentException("Shall specify remote repository to compare against", null);
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178 }
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179 if (comparator == null) {
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180 comparator = new RepositoryComparator(getParentHelper(), remoteRepo);
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181 // comparator.compare(context); // XXX meanwhile we use distinct path to calculate common
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182 }
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183 return comparator;
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184 }
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185
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186 private HgParentChildMap<HgChangelog> getParentHelper() throws HgInvalidControlFileException {
192
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187 if (parentHelper == null) {
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188 parentHelper = new HgParentChildMap<HgChangelog>(localRepo.getChangelog());
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189 parentHelper.init();
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190 }
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191 return parentHelper;
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192 }
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193
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194 private List<BranchChain> getMissingBranches() throws HgRemoteConnectionException, HgInvalidControlFileException, CancelledException {
192
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195 if (missingBranches == null) {
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196 missingBranches = getComparator().calculateMissingBranches();
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197 }
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198 return missingBranches;
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199 }
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200
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201 private List<Nodeid> getCommon() throws HgRemoteConnectionException, HgInvalidControlFileException, CancelledException {
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202 // return getComparator(context).getCommon();
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203 final LinkedHashSet<Nodeid> common = new LinkedHashSet<Nodeid>();
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204 // XXX common can be obtained from repoCompare, but at the moment it would almost duplicate work of calculateMissingBranches
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205 // once I refactor latter, common shall be taken from repoCompare.
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206 RepositoryComparator repoCompare = getComparator();
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207 for (BranchChain bc : getMissingBranches()) {
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208 repoCompare.collectKnownRoots(bc, common);
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209 }
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210 return new LinkedList<Nodeid>(common);
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211 }
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212 }