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annotate src/org/tmatesoft/hg/core/HgIncomingCommand.java @ 215:41a778e3fd31

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Issue 5: Facilities for progress and cancellation. More specific exceptions. Exceptions from callbacks as RuntimeException
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 17 May 2011 00:56:54 +0200
parents ef8eba4aa215
children 6d1804fe0ed7
rev   line source
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1 /*
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2 * Copyright (c) 2011 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.io.IOException;
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20 import java.util.ArrayList;
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21 import java.util.HashSet;
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22 import java.util.Iterator;
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23 import java.util.LinkedHashSet;
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24 import java.util.LinkedList;
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25 import java.util.List;
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26 import java.util.Set;
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27 import java.util.TreeSet;
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28
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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.HgRemoteRepository;
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35 import org.tmatesoft.hg.repo.HgRepository;
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36 import org.tmatesoft.hg.util.CancelledException;
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37 import org.tmatesoft.hg.util.ProgressSupport;
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38
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39 /**
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40 * Command to find out changes available in a remote repository, missing locally.
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class HgIncomingCommand extends HgAbstractCommand<HgIncomingCommand> {
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46
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47 private final HgRepository localRepo;
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48 private HgRemoteRepository remoteRepo;
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49 @SuppressWarnings("unused")
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50 private boolean includeSubrepo;
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51 private RepositoryComparator comparator;
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52 private List<BranchChain> missingBranches;
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53 private HgChangelog.ParentWalker parentHelper;
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54 private Set<String> branches;
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55
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56 public HgIncomingCommand(HgRepository hgRepo) {
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57 localRepo = hgRepo;
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58 }
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59
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60 public HgIncomingCommand against(HgRemoteRepository hgRemote) {
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61 remoteRepo = hgRemote;
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62 comparator = null;
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63 missingBranches = null;
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64 return this;
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65 }
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67 /**
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68 * Select specific branch to push.
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69 * Multiple branch specification possible (changeset from any of these would be included in result).
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70 * Note, {@link #executeLite(Object)} does not respect this setting.
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71 *
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72 * @param branch - branch name, case-sensitive, non-null.
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73 * @return <code>this</code> for convenience
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74 * @throws IllegalArgumentException when branch argument is null
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75 */
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76 public HgIncomingCommand branch(String branch) {
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77 if (branch == null) {
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78 throw new IllegalArgumentException();
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79 }
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80 if (branches == null) {
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81 branches = new TreeSet<String>();
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82 }
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83 branches.add(branch);
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84 return this;
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85 }
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87 /**
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88 * PLACEHOLDER, NOT IMPLEMENTED YET.
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89 *
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90 * Whether to include sub-repositories when collecting changes, default is <code>true</code> XXX or false?
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91 * @return <code>this</code> for convenience
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92 */
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93 public HgIncomingCommand subrepo(boolean include) {
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94 includeSubrepo = include;
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95 throw HgRepository.notImplemented();
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96 }
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98 /**
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99 * Lightweight check for incoming changes, gives only list of revisions to pull.
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100 * Reported changes are from any branch (limits set by {@link #branch(String)} are not taken into account.
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101 *
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102 * @return list of nodes present at remote and missing locally
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103 * @throws HgException
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104 * @throws CancelledException
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105 */
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106 public List<Nodeid> executeLite() throws HgException, CancelledException {
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107 LinkedHashSet<Nodeid> result = new LinkedHashSet<Nodeid>();
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108 RepositoryComparator repoCompare = getComparator();
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109 for (BranchChain bc : getMissingBranches()) {
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110 List<Nodeid> missing = repoCompare.visitBranches(bc);
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111 HashSet<Nodeid> common = new HashSet<Nodeid>(); // ordering is irrelevant
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112 repoCompare.collectKnownRoots(bc, common);
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113 // missing could only start with common elements. Once non-common, rest is just distinct branch revision trails.
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114 for (Iterator<Nodeid> it = missing.iterator(); it.hasNext() && common.contains(it.next()); it.remove()) ;
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115 result.addAll(missing);
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116 }
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117 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(result);
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118 return rv;
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119 }
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120
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121 /**
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122 * Full information about incoming changes
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123 *
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124 * @throws HgException
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125 * @throws CancelledException
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126 */
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127 public void executeFull(final HgChangesetHandler handler) throws HgException/*FIXME specific type*/, HgCallbackTargetException, CancelledException {
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128 if (handler == null) {
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129 throw new IllegalArgumentException("Delegate can't be null");
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130 }
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131 final List<Nodeid> common = getCommon();
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132 HgBundle changegroup = remoteRepo.getChanges(common);
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133 final ProgressSupport ps = getProgressSupport(handler);
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134 try {
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135 final ChangesetTransformer transformer = new ChangesetTransformer(localRepo, handler, getParentHelper(), ps, getCancelSupport(handler));
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136 transformer.limitBranches(branches);
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137 changegroup.changes(localRepo, new HgChangelog.Inspector() {
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138 private int localIndex;
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139 private final HgChangelog.ParentWalker parentHelper;
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140
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141 {
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142 parentHelper = getParentHelper();
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143 // new revisions, if any, would be added after all existing, and would get numbered started with last+1
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144 localIndex = localRepo.getChangelog().getRevisionCount();
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145 }
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146
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147 public void next(int revisionNumber, Nodeid nodeid, RawChangeset cset) {
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148 if (parentHelper.knownNode(nodeid)) {
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149 if (!common.contains(nodeid)) {
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150 throw new HgBadStateException("Bundle shall not report known nodes other than roots we've supplied");
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151 }
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152 return;
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153 }
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154 transformer.next(localIndex++, nodeid, cset);
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155 }
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156 });
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157 transformer.checkFailure();
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158 } catch (IOException ex) {
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159 throw new HgException(ex);
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160 } finally {
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161 ps.done();
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162 }
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163 }
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164
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165 private RepositoryComparator getComparator() throws CancelledException {
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166 if (remoteRepo == null) {
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167 throw new IllegalArgumentException("Shall specify remote repository to compare against", null);
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168 }
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169 if (comparator == null) {
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170 comparator = new RepositoryComparator(getParentHelper(), remoteRepo);
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171 // comparator.compare(context); // XXX meanwhile we use distinct path to calculate common
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172 }
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173 return comparator;
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174 }
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175
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176 private HgChangelog.ParentWalker getParentHelper() {
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177 if (parentHelper == null) {
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178 parentHelper = localRepo.getChangelog().new ParentWalker();
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179 parentHelper.init();
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180 }
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181 return parentHelper;
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182 }
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183
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184 private List<BranchChain> getMissingBranches() throws HgRemoteConnectionException, CancelledException {
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185 if (missingBranches == null) {
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186 missingBranches = getComparator().calculateMissingBranches();
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187 }
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188 return missingBranches;
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189 }
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190
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191 private List<Nodeid> getCommon() throws HgRemoteConnectionException, CancelledException {
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192 // return getComparator(context).getCommon();
192
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193 final LinkedHashSet<Nodeid> common = new LinkedHashSet<Nodeid>();
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194 // XXX common can be obtained from repoCompare, but at the moment it would almost duplicate work of calculateMissingBranches
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195 // once I refactor latter, common shall be taken from repoCompare.
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196 RepositoryComparator repoCompare = getComparator();
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197 for (BranchChain bc : getMissingBranches()) {
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198 repoCompare.collectKnownRoots(bc, common);
192
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199 }
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200 return new LinkedList<Nodeid>(common);
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201 }
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202 }