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annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 290:8faad08c709b

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Expose dirstate to allow pre-configuration of FileIterators for status collection in particular
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 14 Sep 2011 01:52:41 +0200
parents 7232b94f2ae3
children 1483e57541ef
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
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38 /**
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39 * @see http://mercurial.selenic.com/wiki/DirState
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40 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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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 final class HgDirstate /* XXX RepoChangeListener */{
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47 public enum EntryKind {
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48 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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49 }
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50
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51 private final HgRepository repo;
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52 private final File dirstateFile;
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53 private final PathPool pathPool;
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54 private Map<Path, Record> normal;
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55 private Map<Path, Record> added;
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56 private Map<Path, Record> removed;
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57 private Map<Path, Record> merged;
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58 private Pair<Nodeid, Nodeid> parents;
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59 private String currentBranch;
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61 /*package-local*/ HgDirstate(HgRepository hgRepo, File dirstate, PathPool pathPool) {
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62 repo = hgRepo;
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63 dirstateFile = dirstate; // XXX decide whether file names shall be kept local to reader (see #branches()) or passed from outside
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64 this.pathPool = pathPool;
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65 }
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66
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67 private void read() {
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68 normal = added = removed = merged = Collections.<Path, Record>emptyMap();
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69 if (dirstateFile == null || !dirstateFile.exists()) {
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70 return;
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71 }
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72 DataAccess da = repo.getDataAccess().create(dirstateFile);
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73 if (da.isEmpty()) {
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74 return;
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75 }
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76 // not sure linked is really needed here, just for ease of debug
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77 normal = new LinkedHashMap<Path, Record>();
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78 added = new LinkedHashMap<Path, Record>();
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79 removed = new LinkedHashMap<Path, Record>();
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80 merged = new LinkedHashMap<Path, Record>();
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81 try {
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82 parents = internalReadParents(da);
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83 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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84 while (!da.isEmpty()) {
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85 final byte state = da.readByte();
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86 final int fmode = da.readInt();
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87 final int size = da.readInt();
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88 final int time = da.readInt();
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89 final int nameLen = da.readInt();
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90 String fn1 = null, fn2 = null;
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91 byte[] name = new byte[nameLen];
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92 da.readBytes(name, 0, nameLen);
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93 for (int i = 0; i < nameLen; i++) {
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94 if (name[i] == 0) {
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95 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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96 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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97 break;
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98 }
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99 }
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100 if (fn1 == null) {
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101 fn1 = new String(name);
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102 }
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103 Record r = new Record(fmode, size, time, pathPool.path(fn1), fn2 == null ? null : pathPool.path(fn2));
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104 if (state == 'n') {
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105 normal.put(r.name1, r);
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106 } else if (state == 'a') {
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107 added.put(r.name1, r);
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108 } else if (state == 'r') {
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109 removed.put(r.name1, r);
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110 } else if (state == 'm') {
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111 merged.put(r.name1, r);
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112 } else {
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113 // FIXME log error?
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114 }
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115 }
10
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116 } catch (IOException ex) {
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117 ex.printStackTrace(); // FIXME log error, clean dirstate?
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118 } finally {
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119 da.done();
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120 }
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121 }
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122
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123 private static Pair<Nodeid, Nodeid> internalReadParents(DataAccess da) throws IOException {
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124 byte[] parents = new byte[40];
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125 da.readBytes(parents, 0, 40);
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126 Nodeid n1 = Nodeid.fromBinary(parents, 0);
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127 Nodeid n2 = Nodeid.fromBinary(parents, 20);
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128 parents = null;
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129 return new Pair<Nodeid, Nodeid>(n1, n2);
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130 }
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131
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132 /**
290
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133 * @return pair of working copy parents, with {@link Nodeid#NULL} for missing values.
284
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134 */
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135 public Pair<Nodeid,Nodeid> parents() {
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136 if (parents == null) {
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137 parents = readParents(repo, dirstateFile);
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138 }
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139 return parents;
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140 }
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141
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142 /**
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143 * @return pair of parents, both {@link Nodeid#NULL} if dirstate is not available
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144 */
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145 /*package-local*/ static Pair<Nodeid, Nodeid> readParents(HgRepository repo, File dirstateFile) {
284
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146 // do not read whole dirstate if all we need is WC parent information
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147 if (dirstateFile == null || !dirstateFile.exists()) {
284
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148 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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149 }
252
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150 DataAccess da = repo.getDataAccess().create(dirstateFile);
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151 if (da.isEmpty()) {
284
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152 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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153 }
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154 try {
284
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155 return internalReadParents(da);
231
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156 } catch (IOException ex) {
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157 throw new HgBadStateException(ex); // XXX in fact, our exception is not the best solution here.
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158 } finally {
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159 da.done();
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160 }
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161 }
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162
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163 /**
252
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164 * @return branch associated with the working directory
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165 */
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166 public String branch() {
290
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167 // XXX is it really proper place for the method?
252
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168 if (currentBranch == null) {
284
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169 currentBranch = readBranch(repo);
252
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170 }
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171 return currentBranch;
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172 }
284
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173
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174 /**
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175 * XXX is it really proper place for the method?
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176 * @return branch associated with the working directory
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177 */
290
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178 /*package-local*/ static String readBranch(HgRepository repo) {
284
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179 String branch = HgRepository.DEFAULT_BRANCH_NAME;
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180 File branchFile = new File(repo.getRepositoryRoot(), "branch");
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181 if (branchFile.exists()) {
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182 try {
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183 BufferedReader r = new BufferedReader(new FileReader(branchFile));
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184 String b = r.readLine();
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185 if (b != null) {
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186 b = b.trim().intern();
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187 }
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188 branch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
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189 r.close();
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190 } catch (IOException ex) {
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191 ex.printStackTrace(); // XXX log verbose debug, exception might be legal here (i.e. FileNotFound)
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192 // IGNORE
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193 }
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194 }
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195 return branch;
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196 }
231
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197
18
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198 // new, modifiable collection
284
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199 /*package-local*/ TreeSet<Path> all() {
290
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200 if (normal == null) {
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201 read();
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202 }
284
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203 TreeSet<Path> rv = new TreeSet<Path>();
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diff changeset
204 @SuppressWarnings("unchecked")
284
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205 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
18
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206 for (int i = 0; i < all.length; i++) {
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207 for (Record r : all[i].values()) {
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208 rv.add(r.name1);
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209 }
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210 }
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211 return rv;
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212 }
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213
141
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214 /*package-local*/ Record checkNormal(Path fname) {
284
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215 return normal.get(fname);
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216 }
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217
141
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218 /*package-local*/ Record checkAdded(Path fname) {
284
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219 return added.get(fname);
141
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220 }
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diff changeset
221 /*package-local*/ Record checkRemoved(Path fname) {
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222 return removed.get(fname);
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223 }
141
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diff changeset
224 /*package-local*/ Record checkMerged(Path fname) {
284
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diff changeset
225 return merged.get(fname);
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226 }
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230
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231 /*package-local*/ void dump() {
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232 read();
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233 @SuppressWarnings("unchecked")
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234 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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235 char[] x = new char[] {'n', 'a', 'r', 'm' };
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236 for (int i = 0; i < all.length; i++) {
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237 for (Record r : all[i].values()) {
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238 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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239 if (r.name2 != null) {
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240 System.out.printf(" --> %s", r.name2);
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241 }
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242 System.out.println();
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243 }
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244 System.out.println();
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245 }
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246 }
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247
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248 public void walk(Inspector inspector) {
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249 if (normal == null) {
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250 read();
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251 }
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252 @SuppressWarnings("unchecked")
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253 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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254 for (int i = 0; i < all.length; i++) {
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255 EntryKind k = EntryKind.values()[i];
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256 for (Record r : all[i].values()) {
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257 if (!inspector.next(k, r)) {
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258 return;
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259 }
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260 }
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261 }
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262 }
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263
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264 public interface Inspector {
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265 boolean next(EntryKind kind, Record entry);
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266 }
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267
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268 public static final class Record {
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269 private final int mode, size, time;
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270 // Dirstate keeps local file size (i.e. that with any filters already applied).
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271 // Thus, can't compare directly to HgDataFile.length()
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272 private final Path name1, name2;
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273
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274 /*package-local*/ Record(int fmode, int fsize, int ftime, Path name1, Path name2) {
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275 mode = fmode;
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276 size = fsize;
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277 time = ftime;
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278 this.name1 = name1;
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279 this.name2 = name2;
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280
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281 }
290
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282
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283 public Path name() {
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284 return name1;
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285 }
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286
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287 /**
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288 * @return non-<code>null</code> for copy/move
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289 */
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290 public Path copySource() {
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291 return name2;
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292 }
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293
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294 public int modificationTime() {
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295 return time;
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296 }
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297
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298 public int size() {
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299 return size;
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300 }
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301 }
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302 }