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annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 587:a52f4cc56f9c

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Minimize vectors re-allocating when merging patches
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 26 Apr 2013 20:04:17 +0200
parents 2f9ed6bcefa2
children
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1 /*
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2 * Copyright (c) 2010-2013 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 java.util.Collections;
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20 import java.util.HashMap;
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21 import java.util.LinkedHashMap;
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22 import java.util.Map;
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23 import java.util.TreeSet;
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24
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25 import org.tmatesoft.hg.core.Nodeid;
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26 import org.tmatesoft.hg.internal.DirstateReader;
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27 import org.tmatesoft.hg.internal.Internals;
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28 import org.tmatesoft.hg.util.Pair;
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29 import org.tmatesoft.hg.util.Path;
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30 import org.tmatesoft.hg.util.PathRewrite;
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33 /**
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34 * @see http://mercurial.selenic.com/wiki/DirState
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35 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public final class HgDirstate /* XXX RepoChangeListener */{
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41
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42 public enum EntryKind {
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43 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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44 }
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45
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46 private final Internals repo;
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47 private final Path.Source pathPool;
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48 private final PathRewrite canonicalPathRewrite;
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49 private Map<Path, Record> normal;
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50 private Map<Path, Record> added;
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51 private Map<Path, Record> removed;
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52 private Map<Path, Record> merged;
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53 /* map of canonicalized file names to their originals from dirstate file.
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54 * Note, only those canonical names that differ from their dirstate counterpart are recorded here
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55 */
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56 private Map<Path, Path> canonical2dirstateName;
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57 private Pair<Nodeid, Nodeid> parents;
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58
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59 // canonicalPath may be null if we don't need to check for names other than in dirstate
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60 /*package-local*/ HgDirstate(Internals hgRepo, Path.Source pathSource, PathRewrite canonicalPath) {
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61 repo = hgRepo;
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62 pathPool = pathSource;
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63 canonicalPathRewrite = canonicalPath;
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64 }
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66 /*package-local*/ void read() throws HgInvalidControlFileException {
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67 normal = added = removed = merged = Collections.<Path, Record>emptyMap();
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68 parents = new Pair<Nodeid,Nodeid>(Nodeid.NULL, Nodeid.NULL);
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69 if (canonicalPathRewrite != null) {
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70 canonical2dirstateName = new HashMap<Path,Path>();
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71 } else {
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72 canonical2dirstateName = Collections.emptyMap();
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73 }
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74 // not sure linked is really needed here, just for ease of debug
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75 normal = new LinkedHashMap<Path, Record>();
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76 added = new LinkedHashMap<Path, Record>();
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77 removed = new LinkedHashMap<Path, Record>();
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78 merged = new LinkedHashMap<Path, Record>();
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80 DirstateReader dirstateReader = new DirstateReader(repo, pathPool);
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81 dirstateReader.readInto(new Inspector() {
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82
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83 public boolean next(EntryKind kind, Record r) {
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84 if (canonicalPathRewrite != null) {
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85 Path canonicalPath = pathPool.path(canonicalPathRewrite.rewrite(r.name()));
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86 if (canonicalPath != r.name()) { // == as they come from the same pool
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87 assert !canonical2dirstateName.containsKey(canonicalPath); // otherwise there's already a file with same canonical name
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88 // which can't happen for case-insensitive file system (or there's erroneous PathRewrite, perhaps doing smth else)
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89 canonical2dirstateName.put(canonicalPath, r.name());
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90 }
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91 if (r.copySource() != null) {
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92 // not sure I need copy origin in the map, I don't seem to use it anywhere,
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93 // but I guess I'll have to use it some day.
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94 canonicalPath = pathPool.path(canonicalPathRewrite.rewrite(r.copySource()));
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95 if (canonicalPath != r.copySource()) {
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96 canonical2dirstateName.put(canonicalPath, r.copySource());
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97 }
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98 }
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99 }
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100 switch (kind) {
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101 case Normal : normal.put(r.name(), r); break;
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102 case Added : added.put(r.name(), r); break;
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103 case Removed : removed.put(r.name(), r); break;
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104 case Merged : merged.put(r.name1, r); break;
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105 default: throw new HgInvalidStateException(String.format("Unexpected entry in the dirstate: %s", kind));
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106 }
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107 return true;
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108 }
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109 });
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110 parents = dirstateReader.parents();
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111 }
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112
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113 /**
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114 * @return pair of working copy parents, with {@link Nodeid#NULL} for missing values.
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115 */
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116 public Pair<Nodeid,Nodeid> parents() {
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117 assert parents != null; // instance not initialized with #read()
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118 return parents;
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119 }
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120
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121 // new, modifiable collection
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122 /*package-local*/ TreeSet<Path> all() {
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123 assert normal != null;
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124 TreeSet<Path> rv = new TreeSet<Path>();
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125 @SuppressWarnings("unchecked")
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126 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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127 for (int i = 0; i < all.length; i++) {
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128 for (Record r : all[i].values()) {
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129 rv.add(r.name1);
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130 }
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131 }
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132 return rv;
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133 }
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134
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135 /*package-local*/ Record checkNormal(Path fname) {
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136 return internalCheck(normal, fname);
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137 }
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138
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139 /*package-local*/ Record checkAdded(Path fname) {
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140 return internalCheck(added, fname);
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141 }
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142 /*package-local*/ Record checkRemoved(Path fname) {
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143 return internalCheck(removed, fname);
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144 }
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145 /*package-local*/ Record checkMerged(Path fname) {
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146 return internalCheck(merged, fname);
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147 }
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148
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149
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150 // return non-null if fname is known, either as is, or its canonical form. in latter case, this canonical form is return value
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151 /*package-local*/ Path known(Path fname) {
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152 Path fnameCanonical = null;
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153 if (canonicalPathRewrite != null) {
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154 fnameCanonical = pathPool.path(canonicalPathRewrite.rewrite(fname).toString());
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155 if (fnameCanonical != fname && canonical2dirstateName.containsKey(fnameCanonical)) {
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156 // we know right away there's name in dirstate with alternative canonical form
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157 return canonical2dirstateName.get(fnameCanonical);
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158 }
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159 }
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160 @SuppressWarnings("unchecked")
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161 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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162 for (int i = 0; i < all.length; i++) {
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163 if (all[i].containsKey(fname)) {
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164 return fname;
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165 }
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166 if (fnameCanonical != null && all[i].containsKey(fnameCanonical)) {
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167 return fnameCanonical;
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168 }
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169 }
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170 return null;
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171 }
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172
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173 private Record internalCheck(Map<Path, Record> map, Path fname) {
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174 Record rv = map.get(fname);
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175 if (rv != null || canonicalPathRewrite == null) {
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176 return rv;
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177 }
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178 Path fnameCanonical = pathPool.path(canonicalPathRewrite.rewrite(fname).toString());
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179 if (fnameCanonical != fname) {
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180 // case when fname = /a/B/c, and dirstate is /a/b/C
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181 if (canonical2dirstateName.containsKey(fnameCanonical)) {
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182 return map.get(canonical2dirstateName.get(fnameCanonical));
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183 }
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184 // try canonical directly, fname = /a/B/C, dirstate has /a/b/c
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185 if ((rv = map.get(fnameCanonical)) != null) {
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186 return rv;
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187 }
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188 }
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189 return null;
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190 }
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191
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192 public void walk(Inspector inspector) {
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193 assert normal != null;
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194 @SuppressWarnings("unchecked")
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195 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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196 for (int i = 0; i < all.length; i++) {
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197 EntryKind k = EntryKind.values()[i];
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198 for (Record r : all[i].values()) {
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199 if (!inspector.next(k, r)) {
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200 return;
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201 }
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202 }
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203 }
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204 }
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205
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206 public interface Inspector {
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207 /**
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208 * Invoked for each entry in the directory state file
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209 * @param kind file record kind
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210 * @param entry file record. Note, do not cache instance as it may be reused between the calls
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211 * @return <code>true</code> to indicate further records are still of interest, <code>false</code> to stop iteration
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212 */
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213 boolean next(EntryKind kind, Record entry);
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214 }
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215
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216 public static final class Record implements Cloneable {
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217 private final int mode, size, time;
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218 // Dirstate keeps local file size (i.e. that with any filters already applied).
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219 // Thus, can't compare directly to HgDataFile.length()
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220 private final Path name1, name2;
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221
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222 public Record(int fmode, int fsize, int ftime, Path name1, Path name2) {
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223 mode = fmode;
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224 size = fsize;
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225 time = ftime;
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226 this.name1 = name1;
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227 this.name2 = name2;
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228
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229 }
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230
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231 public Path name() {
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232 return name1;
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233 }
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234
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235 /**
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236 * @return non-<code>null</code> for copy/move
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237 */
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238 public Path copySource() {
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239 return name2;
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240 }
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241
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242 public int modificationTime() {
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243 return time;
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244 }
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245
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246 public int size() {
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247 return size;
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248 }
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249
348
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250 public int mode() {
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251 return mode;
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252 }
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253
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254 @Override
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255 public Record clone() {
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256 try {
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257 return (Record) super.clone();
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258 } catch (CloneNotSupportedException ex) {
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259 throw new InternalError(ex.toString());
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260 }
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261 }
10
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262 }
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263 }