Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 4ffc17c0b534
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.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.File;
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22 import java.util.ArrayList;
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23 import java.util.Arrays;
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24 import java.util.Collections;
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25 import java.util.Iterator;
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26 import java.util.List;
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27
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28 import org.tmatesoft.hg.core.HgFileRevision;
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29 import org.tmatesoft.hg.core.HgIOException;
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.internal.Internals;
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32 import org.tmatesoft.hg.internal.LineReader;
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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.LogFacility.Severity;
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36 import org.tmatesoft.hg.util.Pair;
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37 import org.tmatesoft.hg.util.Path;
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38 import org.tmatesoft.hg.util.PathRewrite;
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39
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40 /**
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41 * Access to repository's merge state
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class HgMergeState {
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47 private Nodeid wcp1, wcp2, stateParent;
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48
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49 public enum Kind {
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50 Resolved, Unresolved;
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51 }
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52
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53 public static class Entry {
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54 private final Kind state;
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55 private final HgFileRevision parent1;
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56 private final HgFileRevision parent2;
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57 private final HgFileRevision ancestor;
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58 private final Path wcFile;
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59
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60 /*package-local*/Entry(Kind s, Path actualCopy, HgFileRevision p1, HgFileRevision p2, HgFileRevision ca) {
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61 if (p1 == null || p2 == null || ca == null || actualCopy == null) {
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62 throw new IllegalArgumentException();
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63 }
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64 state = s;
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65 wcFile = actualCopy;
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66 parent1 = p1;
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67 parent2 = p2;
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68 ancestor = ca;
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69 }
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70
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71 public Kind getState() {
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72 return state;
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73 }
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74 public Path getActualFile() {
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75 return wcFile;
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76 }
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77 public HgFileRevision getFirstParent() {
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78 return parent1;
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79 }
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80 public HgFileRevision getSecondParent() {
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81 return parent2;
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82 }
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83 public HgFileRevision getCommonAncestor() {
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84 return ancestor;
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85 }
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86 }
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87
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88 private final Internals repo;
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89 private Entry[] entries;
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90
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91 HgMergeState(Internals internalRepo) {
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92 repo = internalRepo;
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93 }
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94
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95 /**
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96 * Update our knowledge about repository's merge state
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97 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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98 */
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99 public void refresh() throws HgRuntimeException {
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100 final HgRepository hgRepo = repo.getRepo();
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101 entries = null;
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102 // it's possible there are two parents but no merge/state, we shall report this case as 'merging', with proper
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103 // first and second parent values
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104 stateParent = Nodeid.NULL;
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105 Pool<Nodeid> nodeidPool = new Pool<Nodeid>();
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106 Pool<Path> fnamePool = new Pool<Path>();
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107 Pair<Nodeid, Nodeid> wcParents = hgRepo.getWorkingCopyParents();
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108 wcp1 = nodeidPool.unify(wcParents.first()); wcp2 = nodeidPool.unify(wcParents.second());
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109 final File f = repo.getRepositoryFile(HgRepositoryFiles.MergeState);
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110 if (!f.canRead()) {
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111 // empty state
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112 return;
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113 }
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114 try {
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115 ArrayList<Entry> result = new ArrayList<Entry>();
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116 // pipe (already normalized) names from mergestate through same pool of filenames as use manifest revisions
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117 Path.Source pathPool = new Path.SimpleSource(new PathRewrite.Empty(), fnamePool);
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118 final ManifestRevision m1 = new ManifestRevision(nodeidPool, fnamePool);
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119 final ManifestRevision m2 = new ManifestRevision(nodeidPool, fnamePool);
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120 if (!wcp2.isNull()) {
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121 final int rp2 = hgRepo.getChangelog().getRevisionIndex(wcp2);
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122 hgRepo.getManifest().walk(rp2, rp2, m2);
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123 }
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124 LineReader lr = new LineReader(f, repo.getLog());
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125 Iterator<String> lines = lr.read(new LineReader.SimpleLineCollector(), new ArrayList<String>()).iterator();
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126 String s = lines.next();
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127 stateParent = nodeidPool.unify(Nodeid.fromAscii(s));
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128 final int rp1 = hgRepo.getChangelog().getRevisionIndex(stateParent);
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129 hgRepo.getManifest().walk(rp1, rp1, m1);
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130 while (lines.hasNext()) {
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131 s = lines.next();
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132 String[] r = s.split("\\00");
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133 if (r.length < 7) {
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134 repo.getLog().dump(getClass(), Severity.Error, "Expect at least 7 zero-separated fields in the merge state file, not %d. Entry skipped", r.length);
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135 continue;
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136 }
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137 Path p1fname = pathPool.path(r[3]);
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138 Nodeid nidP1 = m1.nodeid(p1fname);
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139 Nodeid nidCA = nodeidPool.unify(Nodeid.fromAscii(r[5]));
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140 HgFileRevision p1 = new HgFileRevision(hgRepo, nidP1, m1.flags(p1fname), p1fname);
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141 HgFileRevision ca;
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142 if (nidCA == nidP1 && r[3].equals(r[4])) {
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143 ca = p1;
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144 } else {
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145 ca = new HgFileRevision(hgRepo, nidCA, null, pathPool.path(r[4]));
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146 }
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147 HgFileRevision p2;
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148 if (!wcp2.isNull() || !r[6].equals(r[4])) {
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149 final Path p2fname = pathPool.path(r[6]);
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150 Nodeid nidP2 = m2.nodeid(p2fname);
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151 if (nidP2 == null) {
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152 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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153 nidP2 = NULL;
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154 }
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155 p2 = new HgFileRevision(hgRepo, nidP2, m2.flags(p2fname), p2fname);
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156 } else {
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157 // no second parent known. no idea what to do here, assume linear merge, use common ancestor as parent
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158 p2 = ca;
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159 }
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160 final Kind k;
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161 if ("u".equals(r[1])) {
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162 k = Kind.Unresolved;
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163 } else if ("r".equals(r[1])) {
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164 k = Kind.Resolved;
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165 } else {
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166 throw new HgInvalidStateException(String.format("Unknown merge kind %s", r[1]));
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167 }
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168 Entry e = new Entry(k, pathPool.path(r[0]), p1, p2, ca);
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169 result.add(e);
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170 }
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171 entries = result.toArray(new Entry[result.size()]);
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172 } catch (HgIOException ex) {
348
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173 throw new HgInvalidControlFileException("Merge state read failed", ex, f);
231
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174 }
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175 }
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176
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177 /**
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178 * Repository is in 'merging' state when changeset to be committed got two parents.
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179 * This method doesn't tell whether there are (un)resolved conflicts in the working copy,
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180 * use {@link #getConflicts()} (which makes sense only when {@link #isStale()} is <code>false</code>).
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181 * @return <code>true</code> when repository is being merged
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182 */
270
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183 public boolean isMerging() {
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184 return !getFirstParent().isNull() && !getSecondParent().isNull() && !isStale();
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185 }
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186
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187 /**
341
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188 * Merge state file may not match actual working copy due to rollback or undo operations.
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189 * Value of {@link #getConflicts()} is reasonable iff this method returned <code>false</code>.
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190 *
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191 * @return <code>true</code> when recorded merge state doesn't seem to correspond to present working copy
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192 */
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193 public boolean isStale() {
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194 assert wcp1 != null;
341
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195 return !stateParent.isNull() /*there's merge state*/ && !wcp1.equals(stateParent) /*and it doesn't match*/;
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196 }
336
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197
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198 /**
341
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199 * It's possible for a repository to be in a 'merging' state (@see {@link #isMerging()} without any
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200 * conflict to resolve (no merge state information file).
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201 *
341
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202 * @return first parent of the working copy, never <code>null</code>
336
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203 */
231
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204 public Nodeid getFirstParent() {
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205 assert wcp1 != null;
231
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206 return wcp1;
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207 }
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208
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209 /**
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210 * @return second parent of the working copy, never <code>null</code>
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211 */
231
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212 public Nodeid getSecondParent() {
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213 assert wcp2 != null;
231
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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 */
270
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220 public Nodeid getStateParent() {
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221 assert stateParent != null;
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222 return stateParent;
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223 }
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224
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225 /**
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226 * List of conflicts as recorded in the merge state information file.
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227 * Note, this information is not valid when {@link #isStale()} is <code>true</code>.
341
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228 *
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229 * @return non-<code>null</code> list with both resolved and unresolved conflicts.
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230 */
231
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231 public List<Entry> getConflicts() {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
232 return entries == null ? Collections.<Entry>emptyList() : Arrays.asList(entries);
1792b37650f2 Introduced access to conflict resolution information (merge state)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
233 }
1792b37650f2 Introduced access to conflict resolution information (merge state)
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
234 }