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annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 354:5f9073eabf06

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Propagate errors with exceptions up to a end client
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 01 Dec 2011 05:21:40 +0100
parents a0864b2892cd
children 2fadf8695f8a
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().getLocalRevision(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().getLocalRevision(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
341
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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 }