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annotate src/org/tmatesoft/hg/repo/HgMergeState.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents f74e36b7344b
children 75c452fdd76a
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.Pair;
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36 import org.tmatesoft.hg.util.Path;
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37 import org.tmatesoft.hg.util.PathPool;
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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 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class HgMergeState {
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46 private Nodeid wcp1, wcp2, stateParent;
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47
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48 public enum Kind {
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49 Resolved, Unresolved;
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50 }
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51
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52 public static class Entry {
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53 private final Kind state;
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54 private final HgFileRevision parent1;
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55 private final HgFileRevision parent2;
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56 private final HgFileRevision ancestor;
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57 private final Path wcFile;
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58
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59 /*package-local*/Entry(Kind s, Path actualCopy, HgFileRevision p1, HgFileRevision p2, HgFileRevision ca) {
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60 if (p1 == null || p2 == null || ca == null || actualCopy == null) {
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61 throw new IllegalArgumentException();
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62 }
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63 state = s;
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64 wcFile = actualCopy;
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65 parent1 = p1;
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66 parent2 = p2;
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67 ancestor = ca;
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68 }
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69
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70 public Kind getState() {
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71 return state;
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72 }
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73 public Path getActualFile() {
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74 return wcFile;
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75 }
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76 public HgFileRevision getFirstParent() {
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77 return parent1;
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78 }
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79 public HgFileRevision getSecondParent() {
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80 return parent2;
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81 }
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82 public HgFileRevision getCommonAncestor() {
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83 return ancestor;
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84 }
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85 }
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86
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87 private final HgRepository repo;
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88 private Entry[] entries;
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89
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90 HgMergeState(HgRepository hgRepo) {
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91 repo = hgRepo;
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92 }
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93
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94 public void refresh() throws IOException/*XXX it's unlikely caller can do anything reasonable about IOException */ {
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95 entries = null;
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96 wcp1 = wcp2 = stateParent = Nodeid.NULL;
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97 final File f = new File(repo.getRepositoryRoot(), "merge/state");
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98 if (!f.canRead()) {
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99 // empty state
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100 return;
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101 }
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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 ArrayList<Entry> result = new ArrayList<Entry>();
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107 // FIXME need to settle use of Pool<Path> and PathPool
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108 // latter is pool that can create objects on demand, former is just cache
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109 PathPool pathPool = new PathPool(new PathRewrite.Empty());
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110 final ManifestRevision m1 = new ManifestRevision(nodeidPool, fnamePool);
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111 final ManifestRevision m2 = new ManifestRevision(nodeidPool, fnamePool);
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112 if (!wcp2.isNull()) {
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113 final int rp2 = repo.getChangelog().getLocalRevision(wcp2);
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114 repo.getManifest().walk(rp2, rp2, m2);
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115 }
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116 BufferedReader br = new BufferedReader(new FileReader(f));
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117 String s = br.readLine();
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118 stateParent = nodeidPool.unify(Nodeid.fromAscii(s));
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119 final int rp1 = repo.getChangelog().getLocalRevision(stateParent);
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120 repo.getManifest().walk(rp1, rp1, m1);
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121 while ((s = br.readLine()) != null) {
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122 String[] r = s.split("\\00");
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123 Path p1fname = pathPool.path(r[3]);
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124 Nodeid nidP1 = m1.nodeid(p1fname);
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125 Nodeid nidCA = nodeidPool.unify(Nodeid.fromAscii(r[5]));
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126 HgFileRevision p1 = new HgFileRevision(repo, nidP1, p1fname);
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127 HgFileRevision ca;
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128 if (nidCA == nidP1 && r[3].equals(r[4])) {
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129 ca = p1;
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130 } else {
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131 ca = new HgFileRevision(repo, nidCA, pathPool.path(r[4]));
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132 }
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133 HgFileRevision p2;
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134 if (!wcp2.isNull() || !r[6].equals(r[4])) {
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135 final Path p2fname = pathPool.path(r[6]);
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136 Nodeid nidP2 = m2.nodeid(p2fname);
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137 if (nidP2 == null) {
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138 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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139 nidP2 = NULL;
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140 }
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141 p2 = new HgFileRevision(repo, nidP2, p2fname);
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142 } else {
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143 // no second parent known. no idea what to do here, assume linear merge, use common ancestor as parent
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144 p2 = ca;
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145 }
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146 final Kind k;
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147 if ("u".equals(r[1])) {
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148 k = Kind.Unresolved;
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149 } else if ("r".equals(r[1])) {
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150 k = Kind.Resolved;
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151 } else {
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152 throw new HgBadStateException(r[1]);
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153 }
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154 Entry e = new Entry(k, pathPool.path(r[0]), p1, p2, ca);
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155 result.add(e);
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156 }
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157 entries = result.toArray(new Entry[result.size()]);
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158 br.close();
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159 pathPool.clear();
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160 }
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161
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162
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163 public boolean isMerging() {
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164 return !getFirstParent().isNull() && !getSecondParent().isNull() && !isStale();
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165 }
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166
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167 /**
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168 * @return <code>true</code> when recorded merge state doesn't seem to correspond to present working copy
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169 */
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170 public boolean isStale() {
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171 if (wcp1 == null) {
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172 throw new HgBadStateException("Call #refresh() first");
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173 }
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174 return !wcp1.equals(stateParent);
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175 }
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176
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177 /**
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178 * FIXME decide what to return if there's no merge state altogether (perhaps, separate method to check that)
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179 * @return never <code>null</code>
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180 */
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181 public Nodeid getFirstParent() {
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182 if (wcp1 == null) {
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183 throw new HgBadStateException("Call #refresh() first");
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184 }
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185 return wcp1;
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186 }
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187
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188 public Nodeid getSecondParent() {
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189 if (wcp2 == null) {
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190 throw new HgBadStateException("Call #refresh() first");
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191 }
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192 return wcp2;
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193 }
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194
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195 /**
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196 * @return revision of the merge state or {@link Nodeid#NULL} if there's no merge state
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197 */
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198 public Nodeid getStateParent() {
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199 if (stateParent == null) {
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200 throw new HgBadStateException("Call #refresh() first");
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201 }
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202 return stateParent;
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203 }
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204
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205 public List<Entry> getConflicts() {
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206 return entries == null ? Collections.<Entry>emptyList() : Arrays.asList(entries);
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207 }
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208 }