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annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 270:c6450b0b1fd5

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Avoid IAE:nullid when looking into stale merge/state file
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 24 Aug 2011 04:10:17 +0200
parents 4c3b9f679412
children 7232b94f2ae3
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.Nodeid;
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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.Path;
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36 import org.tmatesoft.hg.util.PathPool;
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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 *
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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 public void refresh() throws IOException/*XXX it's unlikely caller can do anything reasonable about IOException */ {
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94 entries = null;
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95 final File f = new File(repo.getRepositoryRoot(), "merge/state");
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96 if (!f.canRead()) {
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97 // empty state
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98 return;
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99 }
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100 Pool<Nodeid> nodeidPool = new Pool<Nodeid>();
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101 Pool<String> fnamePool = new Pool<String>();
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102 Nodeid[] wcParents = repo.loadDirstate().parents();
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103 wcp1 = nodeidPool.unify(wcParents[0]); wcp2 = nodeidPool.unify(wcParents[1]);
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104 ArrayList<Entry> result = new ArrayList<Entry>();
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105 PathPool pathPool = new PathPool(new PathRewrite.Empty());
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106 final ManifestRevision m1 = new ManifestRevision(nodeidPool, fnamePool);
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107 final ManifestRevision m2 = new ManifestRevision(nodeidPool, fnamePool);
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108 if (!wcp2.isNull()) {
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109 final int rp2 = repo.getChangelog().getLocalRevision(wcp2);
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110 repo.getManifest().walk(rp2, rp2, m2);
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111 }
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112 BufferedReader br = new BufferedReader(new FileReader(f));
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113 String s = br.readLine();
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114 stateParent = nodeidPool.unify(Nodeid.fromAscii(s));
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115 final int rp1 = repo.getChangelog().getLocalRevision(stateParent);
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116 repo.getManifest().walk(rp1, rp1, m1);
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117 while ((s = br.readLine()) != null) {
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118 String[] r = s.split("\\00");
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119 Nodeid nidP1 = m1.nodeid(r[3]);
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120 Nodeid nidCA = nodeidPool.unify(Nodeid.fromAscii(r[5]));
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121 HgFileRevision p1 = new HgFileRevision(repo, nidP1, pathPool.path(r[3]));
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122 HgFileRevision ca;
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123 if (nidCA == nidP1 && r[3].equals(r[4])) {
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124 ca = p1;
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125 } else {
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126 ca = new HgFileRevision(repo, nidCA, pathPool.path(r[4]));
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127 }
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128 HgFileRevision p2;
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129 if (!wcp2.isNull() || !r[6].equals(r[4])) {
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130 Nodeid nidP2 = m2.nodeid(r[6]);
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131 if (nidP2 == null) {
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132 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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133 nidP2 = NULL;
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134 }
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135 p2 = new HgFileRevision(repo, nidP2, pathPool.path(r[6]));
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136 } else {
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137 // no second parent known. no idea what to do here, assume linear merge, use common ancestor as parent
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138 p2 = ca;
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139 }
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140 final Kind k;
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141 if ("u".equals(r[1])) {
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142 k = Kind.Unresolved;
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143 } else if ("r".equals(r[1])) {
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144 k = Kind.Resolved;
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145 } else {
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146 throw new HgBadStateException(r[1]);
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147 }
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148 Entry e = new Entry(k, pathPool.path(r[0]), p1, p2, ca);
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149 result.add(e);
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150 }
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151 entries = result.toArray(new Entry[result.size()]);
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152 br.close();
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153 pathPool.clear();
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154 }
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155
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156
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157 public boolean isMerging() {
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158 return !getFirstParent().isNull() && !getSecondParent().isNull() && !isStale();
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159 }
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160
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161 /**
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162 * @return <code>true</code> when recorded merge state doesn't seem to correspond to present working copy
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163 */
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164 public boolean isStale() {
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165 if (wcp1 == null) {
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166 throw new HgBadStateException("Call #refresh() first");
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167 }
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168 return !wcp1.equals(stateParent);
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169 }
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170
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171 public Nodeid getFirstParent() {
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172 if (wcp1 == null) {
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173 throw new HgBadStateException("Call #refresh() first");
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174 }
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175 return wcp1;
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176 }
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177
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178 public Nodeid getSecondParent() {
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179 if (wcp2 == null) {
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180 throw new HgBadStateException("Call #refresh() first");
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181 }
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182 return wcp2;
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183 }
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184
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185 public Nodeid getStateParent() {
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186 if (stateParent == null) {
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187 throw new HgBadStateException("Call #refresh() first");
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188 }
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189 return stateParent;
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190 }
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191
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192 public List<Entry> getConflicts() {
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193 return entries == null ? Collections.<Entry>emptyList() : Arrays.asList(entries);
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194 }
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195 }