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annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 396:0ae53c32ecef

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Straighten out exceptions thrown when file access failed - three is too much
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 23 Feb 2012 01:06:24 +0100
parents b015f3918120
children 63c5a9d7ca3f
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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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.FileNotFoundException;
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24 import java.io.FileReader;
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25 import java.io.IOException;
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26 import java.util.Collections;
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27 import java.util.HashMap;
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28 import java.util.LinkedHashMap;
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29 import java.util.Map;
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30 import java.util.TreeSet;
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31
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32 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.internal.DataAccess;
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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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41 /**
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42 * @see http://mercurial.selenic.com/wiki/DirState
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43 * @see http://mercurial.selenic.com/wiki/FileFormats#dirstate
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44 *
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45 * @author Artem Tikhomirov
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46 * @author TMate Software Ltd.
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47 */
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48 public final class HgDirstate /* XXX RepoChangeListener */{
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49
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50 public enum EntryKind {
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51 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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52 }
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53
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54 private final HgRepository repo;
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55 private final File dirstateFile;
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56 private final PathPool pathPool;
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57 private final PathRewrite canonicalPathRewrite;
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58 private Map<Path, Record> normal;
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59 private Map<Path, Record> added;
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60 private Map<Path, Record> removed;
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61 private Map<Path, Record> merged;
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62 /* map of canonicalized file names to their originals from dirstate file.
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63 * Note, only those canonical names that differ from their dirstate counterpart are recorded here
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64 */
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65 private Map<Path, Path> canonical2dirstateName;
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66 private Pair<Nodeid, Nodeid> parents;
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67 private String currentBranch;
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68
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69 // canonicalPath may be null if we don't need to check for names other than in dirstate
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70 /*package-local*/ HgDirstate(HgRepository hgRepo, File dirstate, PathPool pathPool, PathRewrite canonicalPath) {
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71 repo = hgRepo;
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72 dirstateFile = dirstate; // XXX decide whether file names shall be kept local to reader (see #branches()) or passed from outside
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73 this.pathPool = pathPool;
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74 canonicalPathRewrite = canonicalPath;
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75 }
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76
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77 /*package-local*/ void read() throws HgInvalidControlFileException {
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78 normal = added = removed = merged = Collections.<Path, Record>emptyMap();
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79 parents = new Pair<Nodeid,Nodeid>(Nodeid.NULL, Nodeid.NULL);
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80 if (canonicalPathRewrite != null) {
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81 canonical2dirstateName = new HashMap<Path,Path>();
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82 } else {
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83 canonical2dirstateName = Collections.emptyMap();
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84 }
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85 if (dirstateFile == null || !dirstateFile.exists()) {
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86 return;
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87 }
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88 DataAccess da = repo.getDataAccess().create(dirstateFile);
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89 if (da.isEmpty()) {
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90 return;
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91 }
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92 // not sure linked is really needed here, just for ease of debug
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93 normal = new LinkedHashMap<Path, Record>();
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94 added = new LinkedHashMap<Path, Record>();
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95 removed = new LinkedHashMap<Path, Record>();
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96 merged = new LinkedHashMap<Path, Record>();
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97 try {
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98 parents = internalReadParents(da);
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99 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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100 while (!da.isEmpty()) {
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101 final byte state = da.readByte();
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102 final int fmode = da.readInt();
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103 final int size = da.readInt();
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104 final int time = da.readInt();
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105 final int nameLen = da.readInt();
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106 String fn1 = null, fn2 = null;
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107 byte[] name = new byte[nameLen];
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108 da.readBytes(name, 0, nameLen);
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109 for (int i = 0; i < nameLen; i++) {
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110 if (name[i] == 0) {
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111 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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112 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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113 break;
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114 }
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115 }
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116 if (fn1 == null) {
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117 fn1 = new String(name);
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118 }
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119 Record r = new Record(fmode, size, time, pathPool.path(fn1), fn2 == null ? null : pathPool.path(fn2));
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120 if (canonicalPathRewrite != null) {
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121 Path canonicalPath = pathPool.path(canonicalPathRewrite.rewrite(fn1).toString());
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122 if (canonicalPath != r.name()) { // == as they come from the same pool
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123 assert !canonical2dirstateName.containsKey(canonicalPath); // otherwise there's already a file with same canonical name
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124 // which can't happen for case-insensitive file system (or there's erroneous PathRewrite, perhaps doing smth else)
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125 canonical2dirstateName.put(canonicalPath, r.name());
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126 }
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127 if (fn2 != null) {
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128 // not sure I need copy origin in the map, I don't seem to use it anywhere,
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129 // but I guess I'll have to use it some day.
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130 canonicalPath = pathPool.path(canonicalPathRewrite.rewrite(fn2).toString());
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131 if (canonicalPath != r.copySource()) {
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132 canonical2dirstateName.put(canonicalPath, r.copySource());
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133 }
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134 }
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135 }
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136 if (state == 'n') {
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137 normal.put(r.name1, r);
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138 } else if (state == 'a') {
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139 added.put(r.name1, r);
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140 } else if (state == 'r') {
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141 removed.put(r.name1, r);
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142 } else if (state == 'm') {
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143 merged.put(r.name1, r);
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144 } else {
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145 repo.getContext().getLog().warn(getClass(), "Dirstate record for file %s (size: %d, tstamp:%d) has unknown state '%c'", r.name1, r.size(), r.time, state);
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146 }
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147 }
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148 } catch (IOException ex) {
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149 throw new HgInvalidControlFileException("Dirstate read failed", ex, dirstateFile);
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150 } finally {
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151 da.done();
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152 }
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153 }
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154
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155 private static Pair<Nodeid, Nodeid> internalReadParents(DataAccess da) throws IOException {
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156 byte[] parents = new byte[40];
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157 da.readBytes(parents, 0, 40);
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158 Nodeid n1 = Nodeid.fromBinary(parents, 0);
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159 Nodeid n2 = Nodeid.fromBinary(parents, 20);
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160 parents = null;
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161 return new Pair<Nodeid, Nodeid>(n1, n2);
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162 }
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163
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164 /**
290
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165 * @return pair of working copy parents, with {@link Nodeid#NULL} for missing values.
284
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166 */
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167 public Pair<Nodeid,Nodeid> parents() {
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168 assert parents != null; // instance not initialized with #read()
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169 return parents;
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170 }
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171
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172 /**
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173 * @return pair of parents, both {@link Nodeid#NULL} if dirstate is not available
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174 */
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175 /*package-local*/ static Pair<Nodeid, Nodeid> readParents(HgRepository repo, File dirstateFile) throws HgInvalidControlFileException {
284
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176 // do not read whole dirstate if all we need is WC parent information
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177 if (dirstateFile == null || !dirstateFile.exists()) {
284
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178 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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179 }
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180 DataAccess da = repo.getDataAccess().create(dirstateFile);
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181 if (da.isEmpty()) {
284
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182 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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183 }
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184 try {
284
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185 return internalReadParents(da);
231
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186 } catch (IOException ex) {
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187 throw new HgInvalidControlFileException("Error reading working copy parents from dirstate", ex, dirstateFile);
231
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188 } finally {
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189 da.done();
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190 }
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191 }
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192
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193 /**
348
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194 * FIXME move to a better place, e.g. WorkingCopy container that tracks both dirstate and branches (and, perhaps, undo, lastcommit and other similar information)
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195 * @return branch associated with the working directory
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196 */
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197 public String branch() throws HgInvalidControlFileException {
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198 // XXX is it really proper place for the method?
252
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199 if (currentBranch == null) {
284
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200 currentBranch = readBranch(repo);
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201 }
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202 return currentBranch;
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203 }
284
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204
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205 /**
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206 * XXX is it really proper place for the method?
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207 * @return branch associated with the working directory
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208 */
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209 /*package-local*/ static String readBranch(HgRepository repo) throws HgInvalidControlFileException {
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210 String branch = HgRepository.DEFAULT_BRANCH_NAME;
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211 File branchFile = new File(repo.getRepositoryRoot(), "branch");
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212 if (branchFile.exists()) {
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213 try {
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214 BufferedReader r = new BufferedReader(new FileReader(branchFile));
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215 String b = r.readLine();
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216 if (b != null) {
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217 b = b.trim().intern();
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218 }
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219 branch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
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220 r.close();
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221 } catch (FileNotFoundException ex) {
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222 repo.getContext().getLog().debug(HgDirstate.class, ex, null); // log verbose debug, exception might be legal here
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223 // IGNORE
284
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224 } catch (IOException ex) {
348
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225 throw new HgInvalidControlFileException("Error reading file with branch information", ex, branchFile);
284
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226 }
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227 }
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228 return branch;
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229 }
231
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230
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231 // new, modifiable collection
284
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232 /*package-local*/ TreeSet<Path> all() {
348
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233 assert normal != null;
284
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234 TreeSet<Path> rv = new TreeSet<Path>();
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235 @SuppressWarnings("unchecked")
284
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236 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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237 for (int i = 0; i < all.length; i++) {
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238 for (Record r : all[i].values()) {
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239 rv.add(r.name1);
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240 }
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241 }
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242 return rv;
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243 }
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244
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245 /*package-local*/ Record checkNormal(Path fname) {
293
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246 return internalCheck(normal, fname);
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247 }
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248
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249 /*package-local*/ Record checkAdded(Path fname) {
293
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250 return internalCheck(added, fname);
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251 }
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252 /*package-local*/ Record checkRemoved(Path fname) {
293
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253 return internalCheck(removed, fname);
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254 }
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255 /*package-local*/ Record checkMerged(Path fname) {
293
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256 return internalCheck(merged, fname);
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257 }
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258
293
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259
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260 // 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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261 /*package-local*/ Path known(Path fname) {
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262 Path fnameCanonical = null;
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263 if (canonicalPathRewrite != null) {
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264 fnameCanonical = pathPool.path(canonicalPathRewrite.rewrite(fname).toString());
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265 if (fnameCanonical != fname && canonical2dirstateName.containsKey(fnameCanonical)) {
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266 // we know right away there's name in dirstate with alternative canonical form
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267 return canonical2dirstateName.get(fnameCanonical);
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268 }
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269 }
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270 @SuppressWarnings("unchecked")
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271 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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272 for (int i = 0; i < all.length; i++) {
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273 if (all[i].containsKey(fname)) {
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274 return fname;
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275 }
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276 if (fnameCanonical != null && all[i].containsKey(fnameCanonical)) {
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277 return fnameCanonical;
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278 }
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279 }
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280 return null;
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281 }
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282
293
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283 private Record internalCheck(Map<Path, Record> map, Path fname) {
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284 Record rv = map.get(fname);
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285 if (rv != null || canonicalPathRewrite == null) {
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286 return rv;
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287 }
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288 Path fnameCanonical = pathPool.path(canonicalPathRewrite.rewrite(fname).toString());
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289 if (fnameCanonical != fname) {
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290 // case when fname = /a/B/c, and dirstate is /a/b/C
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291 if (canonical2dirstateName.containsKey(fnameCanonical)) {
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292 return map.get(canonical2dirstateName.get(fnameCanonical));
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293 }
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294 // try canonical directly, fname = /a/B/C, dirstate has /a/b/c
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295 if ((rv = map.get(fnameCanonical)) != null) {
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296 return rv;
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297 }
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298 }
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299 return null;
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300 }
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301
290
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302 public void walk(Inspector inspector) {
348
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303 assert normal != null;
290
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304 @SuppressWarnings("unchecked")
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305 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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306 for (int i = 0; i < all.length; i++) {
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307 EntryKind k = EntryKind.values()[i];
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308 for (Record r : all[i].values()) {
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309 if (!inspector.next(k, r)) {
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310 return;
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311 }
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312 }
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313 }
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314 }
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315
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316 public interface Inspector {
293
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317 /**
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318 * Invoked for each entry in the directory state file
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319 * @param kind file record kind
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320 * @param entry file record. Note, do not cache instance as it may be reused between the calls
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321 * @return <code>true</code> to indicate further records are still of interest, <code>false</code> to stop iteration
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322 */
290
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323 boolean next(EntryKind kind, Record entry);
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324 }
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325
293
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326 public static final class Record implements Cloneable {
290
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327 private final int mode, size, time;
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328 // Dirstate keeps local file size (i.e. that with any filters already applied).
280
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329 // Thus, can't compare directly to HgDataFile.length()
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330 private final Path name1, name2;
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331
290
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332 /*package-local*/ Record(int fmode, int fsize, int ftime, Path name1, Path name2) {
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333 mode = fmode;
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334 size = fsize;
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335 time = ftime;
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336 this.name1 = name1;
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337 this.name2 = name2;
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338
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339 }
290
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340
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341 public Path name() {
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342 return name1;
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343 }
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344
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345 /**
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346 * @return non-<code>null</code> for copy/move
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347 */
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348 public Path copySource() {
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349 return name2;
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350 }
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351
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352 public int modificationTime() {
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353 return time;
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354 }
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355
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356 public int size() {
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357 return size;
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358 }
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359
348
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360 public int mode() {
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361 return mode;
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362 }
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363
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364 @Override
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365 public Record clone() {
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366 try {
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367 return (Record) super.clone();
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368 } catch (CloneNotSupportedException ex) {
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369 throw new InternalError(ex.toString());
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370 }
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371 }
10
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372 }
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373 }