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annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 608:e1b29756f901

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Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 21:27:51 +0200
parents b3c16d1aede0
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.repo;
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18
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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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20
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21 import java.io.BufferedReader;
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22 import java.io.File;
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23 import java.io.FileReader;
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24 import java.io.IOException;
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25 import java.util.ArrayList;
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26 import java.util.Arrays;
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27 import java.util.Collections;
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28 import java.util.List;
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29
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30 import org.tmatesoft.hg.core.HgFileRevision;
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31 import org.tmatesoft.hg.core.Nodeid;
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32 import org.tmatesoft.hg.internal.Internals;
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33 import org.tmatesoft.hg.internal.ManifestRevision;
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34 import org.tmatesoft.hg.internal.Pool;
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35 import org.tmatesoft.hg.util.Pair;
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36 import org.tmatesoft.hg.util.Path;
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37 import org.tmatesoft.hg.util.PathRewrite;
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38
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39 /**
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40 * Access to repository's merge state
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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 HgMergeState {
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46 private Nodeid wcp1, wcp2, stateParent;
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47
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48 public enum Kind {
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49 Resolved, Unresolved;
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50 }
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51
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52 public static class Entry {
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53 private final Kind state;
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54 private final HgFileRevision parent1;
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55 private final HgFileRevision parent2;
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56 private final HgFileRevision ancestor;
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57 private final Path wcFile;
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58
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59 /*package-local*/Entry(Kind s, Path actualCopy, HgFileRevision p1, HgFileRevision p2, HgFileRevision ca) {
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60 if (p1 == null || p2 == null || ca == null || actualCopy == null) {
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61 throw new IllegalArgumentException();
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62 }
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63 state = s;
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64 wcFile = actualCopy;
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65 parent1 = p1;
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66 parent2 = p2;
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67 ancestor = ca;
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68 }
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69
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70 public Kind getState() {
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71 return state;
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72 }
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73 public Path getActualFile() {
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74 return wcFile;
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75 }
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76 public HgFileRevision getFirstParent() {
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77 return parent1;
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78 }
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79 public HgFileRevision getSecondParent() {
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80 return parent2;
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81 }
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82 public HgFileRevision getCommonAncestor() {
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83 return ancestor;
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84 }
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85 }
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86
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87 private final Internals repo;
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88 private Entry[] entries;
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89
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90 HgMergeState(Internals internalRepo) {
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91 repo = internalRepo;
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92 }
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94 /**
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95 * Update our knowledge about repository's merge state
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96 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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97 */
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98 public void refresh() throws HgRuntimeException {
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99 final HgRepository hgRepo = repo.getRepo();
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100 entries = null;
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101 // it's possible there are two parents but no merge/state, we shall report this case as 'merging', with proper
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102 // first and second parent values
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103 stateParent = Nodeid.NULL;
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104 Pool<Nodeid> nodeidPool = new Pool<Nodeid>();
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105 Pool<Path> fnamePool = new Pool<Path>();
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106 Pair<Nodeid, Nodeid> wcParents = hgRepo.getWorkingCopyParents();
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107 wcp1 = nodeidPool.unify(wcParents.first()); wcp2 = nodeidPool.unify(wcParents.second());
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108 final File f = repo.getFileFromRepoDir("merge/state");
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109 if (!f.canRead()) {
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110 // empty state
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111 return;
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112 }
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113 try {
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114 ArrayList<Entry> result = new ArrayList<Entry>();
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115 // pipe (already normalized) names from mergestate through same pool of filenames as use manifest revisions
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116 Path.Source pathPool = new Path.SimpleSource(new PathRewrite.Empty(), fnamePool);
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117 final ManifestRevision m1 = new ManifestRevision(nodeidPool, fnamePool);
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118 final ManifestRevision m2 = new ManifestRevision(nodeidPool, fnamePool);
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119 if (!wcp2.isNull()) {
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120 final int rp2 = hgRepo.getChangelog().getRevisionIndex(wcp2);
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121 hgRepo.getManifest().walk(rp2, rp2, m2);
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122 }
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123 BufferedReader br = new BufferedReader(new FileReader(f));
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124 String s = br.readLine();
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125 stateParent = nodeidPool.unify(Nodeid.fromAscii(s));
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126 final int rp1 = hgRepo.getChangelog().getRevisionIndex(stateParent);
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127 hgRepo.getManifest().walk(rp1, rp1, m1);
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128 while ((s = br.readLine()) != null) {
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129 String[] r = s.split("\\00");
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130 Path p1fname = pathPool.path(r[3]);
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131 Nodeid nidP1 = m1.nodeid(p1fname);
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132 Nodeid nidCA = nodeidPool.unify(Nodeid.fromAscii(r[5]));
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133 HgFileRevision p1 = new HgFileRevision(hgRepo, nidP1, m1.flags(p1fname), p1fname);
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134 HgFileRevision ca;
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135 if (nidCA == nidP1 && r[3].equals(r[4])) {
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136 ca = p1;
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137 } else {
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138 ca = new HgFileRevision(hgRepo, nidCA, null, pathPool.path(r[4]));
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139 }
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140 HgFileRevision p2;
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141 if (!wcp2.isNull() || !r[6].equals(r[4])) {
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142 final Path p2fname = pathPool.path(r[6]);
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143 Nodeid nidP2 = m2.nodeid(p2fname);
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144 if (nidP2 == null) {
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145 assert false : "There's not enough information (or I don't know where to look) in merge/state to find out what's the second parent";
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146 nidP2 = NULL;
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147 }
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148 p2 = new HgFileRevision(hgRepo, nidP2, m2.flags(p2fname), p2fname);
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149 } else {
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150 // no second parent known. no idea what to do here, assume linear merge, use common ancestor as parent
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151 p2 = ca;
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152 }
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153 final Kind k;
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154 if ("u".equals(r[1])) {
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155 k = Kind.Unresolved;
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156 } else if ("r".equals(r[1])) {
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157 k = Kind.Resolved;
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158 } else {
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159 throw new HgInvalidStateException(String.format("Unknown merge kind %s", r[1]));
348
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160 }
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161 Entry e = new Entry(k, pathPool.path(r[0]), p1, p2, ca);
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162 result.add(e);
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163 }
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164 entries = result.toArray(new Entry[result.size()]);
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165 br.close();
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166 } catch (IOException ex) {
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167 throw new HgInvalidControlFileException("Merge state read failed", ex, f);
231
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168 }
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169 }
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170
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171 /**
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172 * Repository is in 'merging' state when changeset to be committed got two parents.
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173 * This method doesn't tell whether there are (un)resolved conflicts in the working copy,
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174 * use {@link #getConflicts()} (which makes sense only when {@link #isStale()} is <code>false</code>).
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175 * @return <code>true</code> when repository is being merged
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176 */
270
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177 public boolean isMerging() {
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178 return !getFirstParent().isNull() && !getSecondParent().isNull() && !isStale();
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179 }
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180
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181 /**
341
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182 * Merge state file may not match actual working copy due to rollback or undo operations.
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183 * Value of {@link #getConflicts()} is reasonable iff this method returned <code>false</code>.
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184 *
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185 * @return <code>true</code> when recorded merge state doesn't seem to correspond to present working copy
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186 */
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187 public boolean isStale() {
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188 if (wcp1 == null) {
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189 refresh();
270
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190 }
341
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191 return !stateParent.isNull() /*there's merge state*/ && !wcp1.equals(stateParent) /*and it doesn't match*/;
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192 }
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193
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194 /**
341
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195 * It's possible for a repository to be in a 'merging' state (@see {@link #isMerging()} without any
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196 * conflict to resolve (no merge state information file).
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197 *
341
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198 * @return first parent of the working copy, never <code>null</code>
336
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199 */
231
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200 public Nodeid getFirstParent() {
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201 if (wcp1 == null) {
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202 refresh();
231
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203 }
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204 return wcp1;
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205 }
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206
341
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207 /**
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208 * @return second parent of the working copy, never <code>null</code>
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209 */
231
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210 public Nodeid getSecondParent() {
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211 if (wcp2 == null) {
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212 refresh();
231
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213 }
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214 return wcp2;
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215 }
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216
336
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217 /**
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218 * @return revision of the merge state or {@link Nodeid#NULL} if there's no merge state
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219 */
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220 public Nodeid getStateParent() {
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221 if (stateParent == null) {
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222 refresh();
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223 }
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224 return stateParent;
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225 }
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226
341
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227 /**
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228 * List of conflicts as recorded in the merge state information file.
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229 * Note, this information is valid unless {@link #isStale()} is <code>true</code>.
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230 *
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231 * @return non-<code>null</code> list with both resolved and unresolved conflicts.
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232 */
231
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233 public List<Entry> getConflicts() {
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234 return entries == null ? Collections.<Entry>emptyList() : Arrays.asList(entries);
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235 }
1792b37650f2 Introduced access to conflict resolution information (merge state)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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