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annotate src/org/tmatesoft/hg/internal/PhasesHelper.java @ 665:dde18bc7053b v1.2m1

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Test Copy-on-Write transactions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 10 Jul 2013 20:16:37 +0200
parents 46b56864b483
children
rev   line source
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1 /*
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2 * Copyright (c) 2012-2013 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.HgPhase.Draft;
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20 import static org.tmatesoft.hg.repo.HgPhase.Secret;
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21 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Phaseroots;
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22 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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23
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24 import java.io.File;
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25 import java.io.FileWriter;
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26 import java.io.IOException;
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27 import java.util.ArrayList;
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28 import java.util.Collection;
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29 import java.util.Collections;
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30 import java.util.HashMap;
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31 import java.util.LinkedList;
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32 import java.util.List;
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33
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34 import org.tmatesoft.hg.core.HgChangeset;
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35 import org.tmatesoft.hg.core.HgIOException;
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36 import org.tmatesoft.hg.core.Nodeid;
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37 import org.tmatesoft.hg.repo.HgChangelog;
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38 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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39 import org.tmatesoft.hg.repo.HgInvalidStateException;
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40 import org.tmatesoft.hg.repo.HgParentChildMap;
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41 import org.tmatesoft.hg.repo.HgPhase;
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42 import org.tmatesoft.hg.repo.HgRemoteRepository;
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43 import org.tmatesoft.hg.repo.HgRepository;
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44 import org.tmatesoft.hg.repo.HgRuntimeException;
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45
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46 /**
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47 * Support to deal with Mercurial phases feature (as of Mercurial version 2.1)
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48 *
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49 * @see http://mercurial.selenic.com/wiki/Phases
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50 * @see http://mercurial.selenic.com/wiki/PhasesDevel
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51 *
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52 * @author Artem Tikhomirov
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53 * @author TMate Software Ltd.
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54 */
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55 public final class PhasesHelper {
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56
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57 private final Internals repo;
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58 private final HgParentChildMap<HgChangelog> parentHelper;
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59 private Boolean repoSupporsPhases;
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60 private List<Nodeid> draftPhaseRoots;
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61 private List<Nodeid> secretPhaseRoots;
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62 private RevisionDescendants[][] phaseDescendants = new RevisionDescendants[HgPhase.values().length][];
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63
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64 public PhasesHelper(Internals internalRepo) {
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65 this(internalRepo, null);
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66 }
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67
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68 public PhasesHelper(Internals internalRepo, HgParentChildMap<HgChangelog> pw) {
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69 repo = internalRepo;
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70 parentHelper = pw;
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71 }
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72
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73 public HgRepository getRepo() {
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74 return repo.getRepo();
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75 }
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76
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77 public boolean isCapableOfPhases() throws HgRuntimeException {
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78 if (null == repoSupporsPhases) {
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79 repoSupporsPhases = readRoots();
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80 }
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81 return repoSupporsPhases.booleanValue();
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82 }
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83
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84 public boolean withSecretRoots() {
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85 return !secretPhaseRoots.isEmpty();
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86 }
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87
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88 /**
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89 * @param cset
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90 * revision to query
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91 * @return phase of the changeset, never <code>null</code>
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92 * @throws HgInvalidControlFileException
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93 * if failed to access revlog index/data entry. <em>Runtime exception</em>
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94 * @throws HgRuntimeException
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95 * subclass thereof to indicate other issues with the library. <em>Runtime exception</em>
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96 */
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97 public HgPhase getPhase(HgChangeset cset) throws HgRuntimeException {
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98 final Nodeid csetRev = cset.getNodeid();
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99 final int csetRevIndex = cset.getRevisionIndex();
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100 return getPhase(csetRevIndex, csetRev);
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101 }
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102
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103 /**
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104 * @param csetRevIndex
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105 * revision index to query
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106 * @param csetRev
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107 * revision nodeid, optional
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108 * @return phase of the changeset, never <code>null</code>
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109 * @throws HgInvalidControlFileException
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110 * if failed to access revlog index/data entry. <em>Runtime exception</em>
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111 * @throws HgRuntimeException
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112 * subclass thereof to indicate other issues with the library. <em>Runtime exception</em>
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113 */
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114 public HgPhase getPhase(final int csetRevIndex, Nodeid csetRev) throws HgRuntimeException {
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115 if (!isCapableOfPhases()) {
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116 return HgPhase.Undefined;
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117 }
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118 // csetRev is only used when parentHelper is available
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119 if (parentHelper != null && (csetRev == null || csetRev.isNull())) {
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120 csetRev = getRepo().getChangelog().getRevision(csetRevIndex);
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121 }
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122
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123 for (HgPhase phase : new HgPhase[] { HgPhase.Secret, HgPhase.Draft }) {
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124 List<Nodeid> roots = getPhaseRoots(phase);
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125 if (roots.isEmpty()) {
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126 continue;
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127 }
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128 if (parentHelper != null) {
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129 if (roots.contains(csetRev)) {
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130 return phase;
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131 }
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132 if (parentHelper.childrenOf(roots).contains(csetRev)) {
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133 return phase;
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134 }
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135 } else {
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136 // no parent helper
449
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137 // search all descendants.RevisuionDescendats includes root as well.
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138 for (RevisionDescendants rd : getPhaseDescendants(phase)) {
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139 // isCandidate is to go straight to another root if changeset was added later that the current root
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140 if (rd.isCandidate(csetRevIndex) && rd.isDescendant(csetRevIndex)) {
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141 return phase;
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142 }
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143 }
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144 }
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145 }
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146 return HgPhase.Public;
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147 }
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148
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149 /**
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150 * @return all revisions with secret phase
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151 */
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152 public RevisionSet allSecret() {
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153 return allOf(HgPhase.Secret);
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154 }
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155
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156 /**
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157 * @return all revisions with draft phase
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158 */
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159 public RevisionSet allDraft() {
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160 return allOf(HgPhase.Draft).subtract(allOf(HgPhase.Secret));
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161 }
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162
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163 // XXX throw HgIOException instead?
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164 public void updateRoots(Collection<Nodeid> draftRoots, Collection<Nodeid> secretRoots) throws HgInvalidControlFileException {
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165 draftPhaseRoots = draftRoots.isEmpty() ? Collections.<Nodeid> emptyList() : new ArrayList<Nodeid>(draftRoots);
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166 secretPhaseRoots = secretRoots.isEmpty() ? Collections.<Nodeid> emptyList() : new ArrayList<Nodeid>(secretRoots);
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167 String fmt = "%d %s\n";
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168 File phaseroots = repo.getRepositoryFile(Phaseroots);
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169 FileWriter fw = null;
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170 try {
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171 fw = new FileWriter(phaseroots);
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172 for (Nodeid n : secretPhaseRoots) {
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173 fw.write(String.format(fmt, HgPhase.Secret.mercurialOrdinal(), n.toString()));
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174 }
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175 for (Nodeid n : draftPhaseRoots) {
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176 fw.write(String.format(fmt, HgPhase.Draft.mercurialOrdinal(), n.toString()));
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177 }
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178 fw.flush();
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179 } catch (IOException ex) {
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180 throw new HgInvalidControlFileException(ex.getMessage(), ex, phaseroots);
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181 } finally {
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182 new FileUtils(repo.getLog(), this).closeQuietly(fw);
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183 }
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184 }
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185
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186 public void newCommitNode(Nodeid newChangeset, HgPhase newCommitPhase) throws HgRuntimeException {
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187 final int riCset = repo.getRepo().getChangelog().getRevisionIndex(newChangeset);
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188 HgPhase ph = getPhase(riCset, newChangeset);
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189 if (ph.compareTo(newCommitPhase) >= 0) {
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190 // present phase is more secret than the desired one
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191 return;
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192 }
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193 // newCommitPhase can't be public here, condition above would be satisfied
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194 assert newCommitPhase != HgPhase.Public;
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195 // ph is e.g public when newCommitPhase is draft
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196 // or is draft when desired phase is secret
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197 final RevisionSet rs = allOf(newCommitPhase).union(new RevisionSet(Collections.singleton(newChangeset)));
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198 final RevisionSet newRoots;
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199 if (parentHelper != null) {
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200 newRoots = rs.roots(parentHelper);
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201 } else {
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202 newRoots = rs.roots(repo.getRepo());
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203 }
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204 if (newCommitPhase == HgPhase.Draft) {
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205 updateRoots(newRoots.asList(), secretPhaseRoots);
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206 } else if (newCommitPhase == HgPhase.Secret) {
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207 updateRoots(draftPhaseRoots, newRoots.asList());
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208 } else {
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209 throw new HgInvalidStateException(String.format("Unexpected phase %s for new commits", newCommitPhase));
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210 }
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211 }
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212
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213 /**
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214 * @return set of revisions that are public locally, but draft on remote.
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215 */
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216 public RevisionSet synchronizeWithRemote(HgRemoteRepository.Phases remotePhases, RevisionSet sharedWithRemote) throws HgInvalidControlFileException {
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217 assert parentHelper != null;
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218 RevisionSet presentSecret = allSecret();
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219 RevisionSet presentDraft = allDraft();
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220 RevisionSet secretLeft, draftLeft;
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221 RevisionSet remoteDrafts = knownRemoteDrafts(remotePhases, sharedWithRemote, presentSecret);
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222 if (remotePhases.isPublishingServer()) {
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223 // although it's unlikely shared revisions would affect secret changesets,
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224 // it doesn't hurt to check secret roots along with draft ones
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225 //
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226 // local drafts that are known to be public now
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227 RevisionSet draftsBecomePublic = presentDraft.intersect(sharedWithRemote);
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228 RevisionSet secretsBecomePublic = presentSecret.intersect(sharedWithRemote);
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229 // any ancestor of the public revision is public, too
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230 RevisionSet draftsGone = presentDraft.ancestors(draftsBecomePublic, parentHelper);
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231 RevisionSet secretsGone = presentSecret.ancestors(secretsBecomePublic, parentHelper);
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232 // remove public and their ancestors from drafts
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233 draftLeft = presentDraft.subtract(draftsGone).subtract(draftsBecomePublic);
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234 secretLeft = presentSecret.subtract(secretsGone).subtract(secretsBecomePublic);
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235 } else {
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236 // shall merge local and remote phase states
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237 // revisions that cease to be secret (gonna become Public), e.g. someone else pushed them
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238 RevisionSet secretGone = presentSecret.intersect(remoteDrafts);
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239 // parents of those remote drafts are public, mark them as public locally, too
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240 RevisionSet remotePublic = presentSecret.ancestors(secretGone, parentHelper);
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241 secretLeft = presentSecret.subtract(secretGone).subtract(remotePublic);
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242 /*
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243 * Revisions grow from left to right (parents to the left, children to the right)
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244 *
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245 * I: Set of local is subset of remote
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246 *
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247 * local draft
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248 * --o---r---o---l---o--
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249 * remote draft
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250 *
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251 * Remote draft roots shall be updated
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252 *
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253 *
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254 * II: Set of local is superset of remote
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255 *
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256 * local draft
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257 * --o---l---o---r---o--
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258 * remote draft
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259 *
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260 * Local draft roots shall be updated
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261 */
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262 RevisionSet sharedDraft = presentDraft.intersect(remoteDrafts); // (I: ~presentDraft; II: ~remoteDraft
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263 // XXX do I really need sharedDrafts here? why not ancestors(remoteDrafts)?
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264 RevisionSet localDraftRemotePublic = presentDraft.ancestors(sharedDraft, parentHelper); // I: 0; II: those treated public on remote
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265 // remoteDrafts are local revisions known as draft@remote
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266 // remoteDraftsLocalPublic - revisions that would cease to be listed as draft on remote
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267 RevisionSet remoteDraftsLocalPublic = remoteDrafts.ancestors(sharedDraft, parentHelper);
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268 RevisionSet remoteDraftsLeft = remoteDrafts.subtract(remoteDraftsLocalPublic);
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269 // forget those deemed public by remote (drafts shared by both remote and local are ok to stay)
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270 RevisionSet combinedDraft = presentDraft.union(remoteDraftsLeft);
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271 draftLeft = combinedDraft.subtract(localDraftRemotePublic);
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272 }
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273 final RevisionSet newDraftRoots = draftLeft.roots(parentHelper);
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274 final RevisionSet newSecretRoots = secretLeft.roots(parentHelper);
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275 updateRoots(newDraftRoots.asList(), newSecretRoots.asList());
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276 //
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277 // if there's a remote draft root that points to revision we know is public
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278 RevisionSet remoteDraftsLocalPublic = remoteDrafts.subtract(draftLeft).subtract(secretLeft);
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279 return remoteDraftsLocalPublic;
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280 }
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281
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282 // shared - set of revisions we've shared with remote
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283 private RevisionSet knownRemoteDrafts(HgRemoteRepository.Phases remotePhases, RevisionSet shared, RevisionSet localSecret) {
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284 ArrayList<Nodeid> knownRemoteDraftRoots = new ArrayList<Nodeid>();
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285 for (Nodeid rdr : remotePhases.draftRoots()) {
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286 if (parentHelper.knownNode(rdr)) {
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287 knownRemoteDraftRoots.add(rdr);
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288 }
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289 }
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290 // knownRemoteDraftRoots + childrenOf(knownRemoteDraftRoots) is everything remote may treat as Draft
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291 RevisionSet remoteDrafts = new RevisionSet(knownRemoteDraftRoots);
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292 RevisionSet localChildren = remoteDrafts.children(parentHelper);
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293 // we didn't send any local secret revision
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294 localChildren = localChildren.subtract(localSecret);
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295 // draft roots are among remote drafts
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296 remoteDrafts = remoteDrafts.union(localChildren);
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297 // remoteDrafts is set of local revisions remote may see as Draft. However,
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298 // need to remove from this set revisions we didn't share with remote:
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299 // 1) shared.children gives all local revisions accessible from shared.
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300 // 2) shared.roots.children is equivalent with smaller intermediate set, the way we build
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301 // childrenOf doesn't really benefits from that.
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302 RevisionSet localChildrenNotSent = shared.children(parentHelper).subtract(shared);
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303 // remote shall know only what we've sent, subtract revisions we didn't actually sent
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304 remoteDrafts = remoteDrafts.subtract(localChildrenNotSent);
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305 return remoteDrafts;
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306 }
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307
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308 /**
648
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309 * For a given phase, collect all revisions with phase that is the same or more private (i.e. for Draft, returns Draft+Secret)
663
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310 * The reason is not a nice API intention (which is awful, indeed), but an ease of implementation
648
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311 */
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312 private RevisionSet allOf(HgPhase phase) {
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313 assert phase != HgPhase.Public;
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314 if (!isCapableOfPhases()) {
663
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315 return new RevisionSet(Collections.<Nodeid> emptyList());
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316 }
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317 final List<Nodeid> roots = getPhaseRoots(phase);
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318 if (parentHelper != null) {
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319 return new RevisionSet(roots).union(new RevisionSet(parentHelper.childrenOf(roots)));
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320 } else {
663
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321 RevisionSet rv = new RevisionSet(Collections.<Nodeid> emptyList());
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322 for (RevisionDescendants rd : getPhaseDescendants(phase)) {
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323 rv = rv.union(rd.asRevisionSet());
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324 }
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325 return rv;
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326 }
445
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327 }
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328
628
6526d8adbc0f Explicit HgRuntimeException to facilitate easy switch from runtime to checked exceptions
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329 private Boolean readRoots() throws HgRuntimeException {
647
c75297c17867 Location of repository files as enumeration, use file constants instead of plain names
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330 File phaseroots = repo.getRepositoryFile(Phaseroots);
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331 try {
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332 if (!phaseroots.exists()) {
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333 if (repo.shallCreatePhaseroots()) {
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334 draftPhaseRoots = Collections.<Nodeid>emptyList();
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335 secretPhaseRoots = Collections.<Nodeid>emptyList();
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336 return Boolean.TRUE;
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337 }
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338 return Boolean.FALSE;
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339 }
649
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340 LineReader lr = new LineReader(phaseroots, repo.getLog());
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341 final Collection<String> lines = lr.read(new LineReader.SimpleLineCollector(), new LinkedList<String>());
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342 HashMap<HgPhase, List<Nodeid>> phase2roots = new HashMap<HgPhase, List<Nodeid>>();
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343 for (String line : lines) {
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344 String[] lc = line.split("\\s+");
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345 if (lc.length == 0) {
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346 continue;
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347 }
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348 if (lc.length != 2) {
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349 repo.getSessionContext().getLog().dump(getClass(), Warn, "Bad line in phaseroots:%s", line);
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350 continue;
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351 }
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352 int phaseIndex = Integer.parseInt(lc[0]);
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353 Nodeid rootRev = Nodeid.fromAscii(lc[1]);
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354 if (!getRepo().getChangelog().isKnown(rootRev)) {
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355 repo.getSessionContext().getLog().dump(getClass(), Warn, "Phase(%d) root node %s doesn't exist in the repository, ignored.", phaseIndex, rootRev);
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356 continue;
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357 }
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358 HgPhase phase = HgPhase.parse(phaseIndex);
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359 List<Nodeid> roots = phase2roots.get(phase);
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360 if (roots == null) {
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361 phase2roots.put(phase, roots = new LinkedList<Nodeid>());
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362 }
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363 roots.add(rootRev);
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364 }
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365 draftPhaseRoots = phase2roots.containsKey(Draft) ? phase2roots.get(Draft) : Collections.<Nodeid> emptyList();
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366 secretPhaseRoots = phase2roots.containsKey(Secret) ? phase2roots.get(Secret) : Collections.<Nodeid> emptyList();
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367 } catch (HgIOException ex) {
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368 throw new HgInvalidControlFileException(ex, true);
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369 }
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370 return Boolean.TRUE;
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371 }
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372
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373 private List<Nodeid> getPhaseRoots(HgPhase phase) {
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374 switch (phase) {
663
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375 case Draft:
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376 return draftPhaseRoots;
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377 case Secret:
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378 return secretPhaseRoots;
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379 }
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380 return Collections.emptyList();
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381 }
449
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382
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383 private RevisionDescendants[] getPhaseDescendants(HgPhase phase) throws HgRuntimeException {
447
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384 int ordinal = phase.ordinal();
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385 if (phaseDescendants[ordinal] == null) {
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386 phaseDescendants[ordinal] = buildPhaseDescendants(phase);
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387 }
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388 return phaseDescendants[ordinal];
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389 }
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390
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391 private RevisionDescendants[] buildPhaseDescendants(HgPhase phase) throws HgRuntimeException {
449
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392 int[] roots = toIndexes(getPhaseRoots(phase));
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393 RevisionDescendants[] rv = new RevisionDescendants[roots.length];
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394 for (int i = 0; i < roots.length; i++) {
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395 rv[i] = new RevisionDescendants(getRepo(), roots[i]);
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396 rv[i].build();
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397 }
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398 return rv;
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399 }
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400
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401 private int[] toIndexes(List<Nodeid> roots) throws HgRuntimeException {
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402 int[] rv = new int[roots.size()];
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403 for (int i = 0; i < rv.length; i++) {
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404 rv[i] = getRepo().getChangelog().getRevisionIndex(roots.get(i));
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405 }
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406 return rv;
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407 }
445
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408 }