Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 461:613c883e360e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Do not walk into nested repositories at all, ignore not only .hg but whole nested repo
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 20 Jun 2012 16:51:18 +0200
parents 12f668401613
children b3c16d1aede0
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.ManifestRevision;
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33 import org.tmatesoft.hg.internal.Pool;
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34 import org.tmatesoft.hg.util.Pair;
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35 import org.tmatesoft.hg.util.Path;
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36 import org.tmatesoft.hg.util.PathRewrite;
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37
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38 /**
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39 * Access to repository's merge state
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40 *
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41 * @author Artem Tikhomirov
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42 * @author TMate Software Ltd.
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43 */
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44 public class HgMergeState {
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45 private Nodeid wcp1, wcp2, stateParent;
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46
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47 public enum Kind {
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48 Resolved, Unresolved;
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49 }
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50
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51 public static class Entry {
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52 private final Kind state;
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53 private final HgFileRevision parent1;
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54 private final HgFileRevision parent2;
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55 private final HgFileRevision ancestor;
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56 private final Path wcFile;
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57
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58 /*package-local*/Entry(Kind s, Path actualCopy, HgFileRevision p1, HgFileRevision p2, HgFileRevision ca) {
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59 if (p1 == null || p2 == null || ca == null || actualCopy == null) {
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60 throw new IllegalArgumentException();
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61 }
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62 state = s;
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63 wcFile = actualCopy;
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64 parent1 = p1;
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65 parent2 = p2;
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66 ancestor = ca;
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67 }
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68
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69 public Kind getState() {
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70 return state;
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71 }
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72 public Path getActualFile() {
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73 return wcFile;
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74 }
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75 public HgFileRevision getFirstParent() {
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76 return parent1;
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77 }
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78 public HgFileRevision getSecondParent() {
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79 return parent2;
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80 }
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81 public HgFileRevision getCommonAncestor() {
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82 return ancestor;
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83 }
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84 }
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85
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86 private final HgRepository repo;
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87 private Entry[] entries;
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88
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89 HgMergeState(HgRepository hgRepo) {
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90 repo = hgRepo;
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91 }
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92
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93 /**
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94 * Update our knowledge about repository's merge state
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95 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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96 */
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97 public void refresh() throws HgRuntimeException {
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98 entries = null;
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99 // it's possible there are two parents but no merge/state, we shall report this case as 'merging', with proper
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100 // first and second parent values
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101 stateParent = Nodeid.NULL;
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102 Pool<Nodeid> nodeidPool = new Pool<Nodeid>();
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103 Pool<Path> fnamePool = new Pool<Path>();
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104 Pair<Nodeid, Nodeid> wcParents = repo.getWorkingCopyParents();
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105 wcp1 = nodeidPool.unify(wcParents.first()); wcp2 = nodeidPool.unify(wcParents.second());
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106 final File f = new File(repo.getRepositoryRoot(), "merge/state");
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107 if (!f.canRead()) {
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108 // empty state
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109 return;
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110 }
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111 try {
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112 ArrayList<Entry> result = new ArrayList<Entry>();
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113 // pipe (already normalized) names from mergestate through same pool of filenames as use manifest revisions
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114 Path.Source pathPool = new Path.SimpleSource(new PathRewrite.Empty(), fnamePool);
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115 final ManifestRevision m1 = new ManifestRevision(nodeidPool, fnamePool);
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116 final ManifestRevision m2 = new ManifestRevision(nodeidPool, fnamePool);
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117 if (!wcp2.isNull()) {
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118 final int rp2 = repo.getChangelog().getRevisionIndex(wcp2);
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119 repo.getManifest().walk(rp2, rp2, m2);
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120 }
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121 BufferedReader br = new BufferedReader(new FileReader(f));
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122 String s = br.readLine();
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123 stateParent = nodeidPool.unify(Nodeid.fromAscii(s));
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124 final int rp1 = repo.getChangelog().getRevisionIndex(stateParent);
348
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125 repo.getManifest().walk(rp1, rp1, m1);
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126 while ((s = br.readLine()) != null) {
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127 String[] r = s.split("\\00");
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128 Path p1fname = pathPool.path(r[3]);
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129 Nodeid nidP1 = m1.nodeid(p1fname);
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130 Nodeid nidCA = nodeidPool.unify(Nodeid.fromAscii(r[5]));
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131 HgFileRevision p1 = new HgFileRevision(repo, nidP1, m1.flags(p1fname), p1fname);
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132 HgFileRevision ca;
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133 if (nidCA == nidP1 && r[3].equals(r[4])) {
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134 ca = p1;
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135 } else {
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136 ca = new HgFileRevision(repo, nidCA, null, pathPool.path(r[4]));
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137 }
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138 HgFileRevision p2;
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139 if (!wcp2.isNull() || !r[6].equals(r[4])) {
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140 final Path p2fname = pathPool.path(r[6]);
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141 Nodeid nidP2 = m2.nodeid(p2fname);
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142 if (nidP2 == null) {
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143 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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144 nidP2 = NULL;
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145 }
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146 p2 = new HgFileRevision(repo, nidP2, m2.flags(p2fname), p2fname);
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147 } else {
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148 // no second parent known. no idea what to do here, assume linear merge, use common ancestor as parent
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149 p2 = ca;
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150 }
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151 final Kind k;
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152 if ("u".equals(r[1])) {
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153 k = Kind.Unresolved;
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154 } else if ("r".equals(r[1])) {
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155 k = Kind.Resolved;
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156 } else {
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157 throw new HgInvalidStateException(String.format("Unknown merge kind %s", r[1]));
348
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158 }
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159 Entry e = new Entry(k, pathPool.path(r[0]), p1, p2, ca);
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160 result.add(e);
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161 }
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162 entries = result.toArray(new Entry[result.size()]);
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163 br.close();
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164 } catch (IOException ex) {
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165 throw new HgInvalidControlFileException("Merge state read failed", ex, f);
231
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166 }
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167 }
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168
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169 /**
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170 * Repository is in 'merging' state when changeset to be committed got two parents.
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171 * This method doesn't tell whether there are (un)resolved conflicts in the working copy,
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172 * use {@link #getConflicts()} (which makes sense only when {@link #isStale()} is <code>false</code>).
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173 * @return <code>true</code> when repository is being merged
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174 */
270
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175 public boolean isMerging() {
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176 return !getFirstParent().isNull() && !getSecondParent().isNull() && !isStale();
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177 }
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178
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179 /**
341
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180 * Merge state file may not match actual working copy due to rollback or undo operations.
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181 * Value of {@link #getConflicts()} is reasonable iff this method returned <code>false</code>.
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182 *
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183 * @return <code>true</code> when recorded merge state doesn't seem to correspond to present working copy
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184 */
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185 public boolean isStale() {
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186 if (wcp1 == null) {
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187 refresh();
270
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188 }
341
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189 return !stateParent.isNull() /*there's merge state*/ && !wcp1.equals(stateParent) /*and it doesn't match*/;
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190 }
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191
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192 /**
341
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193 * It's possible for a repository to be in a 'merging' state (@see {@link #isMerging()} without any
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194 * conflict to resolve (no merge state information file).
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195 *
341
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196 * @return first parent of the working copy, never <code>null</code>
336
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197 */
231
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198 public Nodeid getFirstParent() {
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199 if (wcp1 == null) {
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200 refresh();
231
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201 }
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202 return wcp1;
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203 }
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204
341
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205 /**
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206 * @return second parent of the working copy, never <code>null</code>
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207 */
231
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208 public Nodeid getSecondParent() {
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209 if (wcp2 == null) {
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210 refresh();
231
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211 }
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212 return wcp2;
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213 }
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214
336
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215 /**
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216 * @return revision of the merge state or {@link Nodeid#NULL} if there's no merge state
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217 */
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218 public Nodeid getStateParent() {
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219 if (stateParent == null) {
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220 refresh();
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221 }
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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 valid unless {@link #isStale()} is <code>true</code>.
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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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232 return entries == null ? Collections.<Entry>emptyList() : Arrays.asList(entries);
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233 }
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234 }