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annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 292:a415fe296a50

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Refactor PathRewrite to accept any char sequence, not only string
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 14 Sep 2011 02:16:19 +0200
parents 1483e57541ef
children 9774f47d904d
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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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.Collections;
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26 import java.util.LinkedHashMap;
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27 import java.util.Map;
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28 import java.util.TreeSet;
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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.Nodeid;
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32 import org.tmatesoft.hg.internal.DataAccess;
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33 import org.tmatesoft.hg.util.Pair;
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34 import org.tmatesoft.hg.util.Path;
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35 import org.tmatesoft.hg.util.PathPool;
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36 import org.tmatesoft.hg.util.PathRewrite;
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37
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39 /**
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40 * @see http://mercurial.selenic.com/wiki/DirState
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41 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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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 final class HgDirstate /* XXX RepoChangeListener */{
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47
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48 public enum EntryKind {
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49 Normal, Added, Removed, Merged, // order is being used in code of this class, don't change unless any use is checked
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50 }
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51
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52 private final HgRepository repo;
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53 private final File dirstateFile;
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54 private final PathPool pathPool;
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55 private final PathRewrite canonicalPathRewrite;
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56 private Map<Path, Record> normal;
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57 private Map<Path, Record> added;
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58 private Map<Path, Record> removed;
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59 private Map<Path, Record> merged;
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60 private Map<Path, Path> canonical2dirstate; // map of canonicalized file names to their originals from dirstate file
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61 private Pair<Nodeid, Nodeid> parents;
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62 private String currentBranch;
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63
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64 // canonicalPath may be null if we don't need to check for names other than in dirstate
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65 /*package-local*/ HgDirstate(HgRepository hgRepo, File dirstate, PathPool pathPool, PathRewrite canonicalPath) {
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66 repo = hgRepo;
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67 dirstateFile = dirstate; // XXX decide whether file names shall be kept local to reader (see #branches()) or passed from outside
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68 this.pathPool = pathPool;
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69 canonicalPathRewrite = canonicalPath;
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70 }
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71
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72 private void read() {
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73 normal = added = removed = merged = Collections.<Path, Record>emptyMap();
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74 if (dirstateFile == null || !dirstateFile.exists()) {
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75 return;
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76 }
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77 DataAccess da = repo.getDataAccess().create(dirstateFile);
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78 if (da.isEmpty()) {
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79 return;
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80 }
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81 // not sure linked is really needed here, just for ease of debug
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82 normal = new LinkedHashMap<Path, Record>();
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83 added = new LinkedHashMap<Path, Record>();
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84 removed = new LinkedHashMap<Path, Record>();
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85 merged = new LinkedHashMap<Path, Record>();
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86 try {
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87 parents = internalReadParents(da);
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88 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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89 while (!da.isEmpty()) {
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90 final byte state = da.readByte();
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91 final int fmode = da.readInt();
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92 final int size = da.readInt();
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93 final int time = da.readInt();
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94 final int nameLen = da.readInt();
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95 String fn1 = null, fn2 = null;
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96 byte[] name = new byte[nameLen];
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97 da.readBytes(name, 0, nameLen);
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98 for (int i = 0; i < nameLen; i++) {
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99 if (name[i] == 0) {
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100 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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101 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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102 break;
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103 }
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104 }
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105 if (fn1 == null) {
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106 fn1 = new String(name);
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107 }
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108 Record r = new Record(fmode, size, time, pathPool.path(fn1), fn2 == null ? null : pathPool.path(fn2));
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109 if (state == 'n') {
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110 normal.put(r.name1, r);
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111 } else if (state == 'a') {
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112 added.put(r.name1, r);
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113 } else if (state == 'r') {
18
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diff changeset
114 removed.put(r.name1, r);
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115 } else if (state == 'm') {
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116 merged.put(r.name1, r);
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117 } else {
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118 // FIXME log error?
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119 }
227
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120 }
10
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121 } catch (IOException ex) {
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122 ex.printStackTrace(); // FIXME log error, clean dirstate?
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123 } finally {
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124 da.done();
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125 }
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126 }
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127
284
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128 private static Pair<Nodeid, Nodeid> internalReadParents(DataAccess da) throws IOException {
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129 byte[] parents = new byte[40];
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130 da.readBytes(parents, 0, 40);
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131 Nodeid n1 = Nodeid.fromBinary(parents, 0);
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132 Nodeid n2 = Nodeid.fromBinary(parents, 20);
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133 parents = null;
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134 return new Pair<Nodeid, Nodeid>(n1, n2);
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135 }
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136
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137 /**
290
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138 * @return pair of working copy parents, with {@link Nodeid#NULL} for missing values.
284
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139 */
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140 public Pair<Nodeid,Nodeid> parents() {
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141 if (parents == null) {
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142 parents = readParents(repo, dirstateFile);
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143 }
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144 return parents;
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145 }
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146
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147 /**
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148 * @return pair of parents, both {@link Nodeid#NULL} if dirstate is not available
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149 */
290
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150 /*package-local*/ static Pair<Nodeid, Nodeid> readParents(HgRepository repo, File dirstateFile) {
284
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151 // do not read whole dirstate if all we need is WC parent information
231
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152 if (dirstateFile == null || !dirstateFile.exists()) {
284
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153 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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154 }
252
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155 DataAccess da = repo.getDataAccess().create(dirstateFile);
231
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156 if (da.isEmpty()) {
284
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157 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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158 }
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159 try {
284
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160 return internalReadParents(da);
231
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161 } catch (IOException ex) {
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162 throw new HgBadStateException(ex); // XXX in fact, our exception is not the best solution here.
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163 } finally {
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164 da.done();
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165 }
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166 }
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167
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168 /**
252
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169 * @return branch associated with the working directory
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170 */
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171 public String branch() {
290
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172 // XXX is it really proper place for the method?
252
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173 if (currentBranch == null) {
284
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174 currentBranch = readBranch(repo);
252
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175 }
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diff changeset
176 return currentBranch;
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177 }
284
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178
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179 /**
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180 * XXX is it really proper place for the method?
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181 * @return branch associated with the working directory
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182 */
290
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183 /*package-local*/ static String readBranch(HgRepository repo) {
284
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184 String branch = HgRepository.DEFAULT_BRANCH_NAME;
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185 File branchFile = new File(repo.getRepositoryRoot(), "branch");
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diff changeset
186 if (branchFile.exists()) {
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diff changeset
187 try {
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diff changeset
188 BufferedReader r = new BufferedReader(new FileReader(branchFile));
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diff changeset
189 String b = r.readLine();
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diff changeset
190 if (b != null) {
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diff changeset
191 b = b.trim().intern();
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192 }
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193 branch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
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diff changeset
194 r.close();
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diff changeset
195 } catch (IOException ex) {
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196 ex.printStackTrace(); // XXX log verbose debug, exception might be legal here (i.e. FileNotFound)
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diff changeset
197 // IGNORE
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diff changeset
198 }
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199 }
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200 return branch;
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201 }
231
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202
18
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203 // new, modifiable collection
284
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204 /*package-local*/ TreeSet<Path> all() {
290
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diff changeset
205 if (normal == null) {
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diff changeset
206 read();
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diff changeset
207 }
284
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diff changeset
208 TreeSet<Path> rv = new TreeSet<Path>();
18
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diff changeset
209 @SuppressWarnings("unchecked")
284
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diff changeset
210 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
18
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diff changeset
211 for (int i = 0; i < all.length; i++) {
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diff changeset
212 for (Record r : all[i].values()) {
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diff changeset
213 rv.add(r.name1);
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214 }
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215 }
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diff changeset
216 return rv;
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diff changeset
217 }
02ee376bee79 status operation against current working directory
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diff changeset
218
141
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diff changeset
219 /*package-local*/ Record checkNormal(Path fname) {
284
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diff changeset
220 return normal.get(fname);
18
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diff changeset
221 }
02ee376bee79 status operation against current working directory
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diff changeset
222
141
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diff changeset
223 /*package-local*/ Record checkAdded(Path fname) {
284
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diff changeset
224 return added.get(fname);
141
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225 }
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226 /*package-local*/ Record checkRemoved(Path fname) {
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227 return removed.get(fname);
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228 }
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229 /*package-local*/ Record checkMerged(Path fname) {
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230 return merged.get(fname);
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231 }
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232
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233
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234
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235
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236 /*package-local*/ void dump() {
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237 read();
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238 @SuppressWarnings("unchecked")
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239 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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240 char[] x = new char[] {'n', 'a', 'r', 'm' };
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241 for (int i = 0; i < all.length; i++) {
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242 for (Record r : all[i].values()) {
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243 System.out.printf("%c %3o%6d %30tc\t\t%s", x[i], r.mode, r.size, (long) r.time * 1000, r.name1);
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244 if (r.name2 != null) {
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245 System.out.printf(" --> %s", r.name2);
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246 }
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247 System.out.println();
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248 }
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249 System.out.println();
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250 }
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251 }
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252
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253 public void walk(Inspector inspector) {
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254 if (normal == null) {
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255 read();
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256 }
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257 @SuppressWarnings("unchecked")
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258 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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259 for (int i = 0; i < all.length; i++) {
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260 EntryKind k = EntryKind.values()[i];
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261 for (Record r : all[i].values()) {
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262 if (!inspector.next(k, r)) {
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263 return;
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264 }
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265 }
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266 }
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267 }
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268
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269 public interface Inspector {
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270 boolean next(EntryKind kind, Record entry);
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271 }
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272
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273 public static final class Record {
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274 private final int mode, size, time;
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275 // Dirstate keeps local file size (i.e. that with any filters already applied).
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276 // Thus, can't compare directly to HgDataFile.length()
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277 private final Path name1, name2;
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278
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279 /*package-local*/ Record(int fmode, int fsize, int ftime, Path name1, Path name2) {
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280 mode = fmode;
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281 size = fsize;
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282 time = ftime;
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283 this.name1 = name1;
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284 this.name2 = name2;
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285
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286 }
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287
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288 public Path name() {
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289 return name1;
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290 }
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291
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292 /**
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293 * @return non-<code>null</code> for copy/move
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294 */
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295 public Path copySource() {
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296 return name2;
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297 }
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298
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299 public int modificationTime() {
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300 return time;
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301 }
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302
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303 public int size() {
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304 return size;
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305 }
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306 }
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307 }