Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 449:5787e912f60e smartgit3

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Speed up changeset phase detection when no parent cache is avalable
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 07 Jun 2012 16:01:09 +0200
parents 2fadf8695f8a
children ee8264d80747
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.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.HgBadStateException;
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31 import org.tmatesoft.hg.core.HgFileRevision;
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32 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.internal.ManifestRevision;
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35 import org.tmatesoft.hg.internal.Pool;
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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.PathPool;
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39 import org.tmatesoft.hg.util.PathRewrite;
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40
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41 /**
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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 HgRepository repo;
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89 private Entry[] entries;
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90
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91 HgMergeState(HgRepository hgRepo) {
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92 repo = hgRepo;
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93 }
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94
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95 public void refresh() throws HgInvalidControlFileException {
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96 entries = null;
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97 // it's possible there are two parents but no merge/state, we shall report this case as 'merging', with proper
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98 // first and second parent values
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99 stateParent = Nodeid.NULL;
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100 Pool<Nodeid> nodeidPool = new Pool<Nodeid>();
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101 Pool<Path> fnamePool = new Pool<Path>();
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102 Pair<Nodeid, Nodeid> wcParents = repo.getWorkingCopyParents();
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103 wcp1 = nodeidPool.unify(wcParents.first()); wcp2 = nodeidPool.unify(wcParents.second());
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104 final File f = new File(repo.getRepositoryRoot(), "merge/state");
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105 if (!f.canRead()) {
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106 // empty state
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107 return;
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108 }
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109 try {
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110 ArrayList<Entry> result = new ArrayList<Entry>();
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111 // FIXME need to settle use of Pool<Path> and PathPool
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112 // latter is pool that can create objects on demand, former is just cache
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113 PathPool pathPool = new PathPool(new PathRewrite.Empty());
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114 final ManifestRevision m1 = new ManifestRevision(nodeidPool, fnamePool);
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115 final ManifestRevision m2 = new ManifestRevision(nodeidPool, fnamePool);
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116 if (!wcp2.isNull()) {
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117 final int rp2 = repo.getChangelog().getRevisionIndex(wcp2);
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118 repo.getManifest().walk(rp2, rp2, m2);
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119 }
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120 BufferedReader br = new BufferedReader(new FileReader(f));
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121 String s = br.readLine();
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122 stateParent = nodeidPool.unify(Nodeid.fromAscii(s));
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123 final int rp1 = repo.getChangelog().getRevisionIndex(stateParent);
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124 repo.getManifest().walk(rp1, rp1, m1);
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125 while ((s = br.readLine()) != null) {
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126 String[] r = s.split("\\00");
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127 Path p1fname = pathPool.path(r[3]);
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128 Nodeid nidP1 = m1.nodeid(p1fname);
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129 Nodeid nidCA = nodeidPool.unify(Nodeid.fromAscii(r[5]));
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130 HgFileRevision p1 = new HgFileRevision(repo, nidP1, p1fname);
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131 HgFileRevision ca;
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132 if (nidCA == nidP1 && r[3].equals(r[4])) {
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133 ca = p1;
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134 } else {
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135 ca = new HgFileRevision(repo, nidCA, pathPool.path(r[4]));
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136 }
348
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137 HgFileRevision p2;
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138 if (!wcp2.isNull() || !r[6].equals(r[4])) {
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139 final Path p2fname = pathPool.path(r[6]);
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140 Nodeid nidP2 = m2.nodeid(p2fname);
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141 if (nidP2 == null) {
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142 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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143 nidP2 = NULL;
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144 }
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145 p2 = new HgFileRevision(repo, nidP2, p2fname);
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146 } else {
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147 // no second parent known. no idea what to do here, assume linear merge, use common ancestor as parent
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148 p2 = ca;
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149 }
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150 final Kind k;
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151 if ("u".equals(r[1])) {
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152 k = Kind.Unresolved;
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153 } else if ("r".equals(r[1])) {
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154 k = Kind.Resolved;
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155 } else {
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156 throw new HgBadStateException(r[1]);
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157 }
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158 Entry e = new Entry(k, pathPool.path(r[0]), p1, p2, ca);
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159 result.add(e);
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160 }
348
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161 entries = result.toArray(new Entry[result.size()]);
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162 br.close();
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163 pathPool.clear();
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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 }
270
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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 throw new HgBadStateException("Call #refresh() first");
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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 * @return first parent of the working copy, never <code>null</code>
336
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196 */
231
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197 public Nodeid getFirstParent() {
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198 if (wcp1 == null) {
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199 throw new HgBadStateException("Call #refresh() first");
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200 }
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201 return wcp1;
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202 }
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203
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204 /**
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205 * @return second parent of the working copy, never <code>null</code>
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206 */
231
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207 public Nodeid getSecondParent() {
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208 if (wcp2 == null) {
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209 throw new HgBadStateException("Call #refresh() first");
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210 }
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211 return wcp2;
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212 }
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213
336
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214 /**
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215 * @return revision of the merge state or {@link Nodeid#NULL} if there's no merge state
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216 */
270
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217 public Nodeid getStateParent() {
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218 if (stateParent == null) {
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219 throw new HgBadStateException("Call #refresh() first");
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220 }
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221 return stateParent;
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222 }
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223
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224 /**
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225 * List of conflicts as recorded in the merge state information file.
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226 * Note, this information is valid unless {@link #isStale()} is <code>true</code>.
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227 *
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228 * @return non-<code>null</code> list with both resolved and unresolved conflicts.
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229 */
231
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230 public List<Entry> getConflicts() {
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231 return entries == null ? Collections.<Entry>emptyList() : Arrays.asList(entries);
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232 }
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233 }