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annotate src/org/tmatesoft/hg/repo/HgDirstate.java @ 366:189dc6dc1c3e

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Use exceptions to expose errors reading mercurial data
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 16 Dec 2011 04:43:18 +0100
parents a0864b2892cd
children aa2e589d4e84
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 if (canonicalPathRewrite != null) {
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80 canonical2dirstateName = new HashMap<Path,Path>();
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81 } else {
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82 canonical2dirstateName = Collections.emptyMap();
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83 }
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84 if (dirstateFile == null || !dirstateFile.exists()) {
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85 return;
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86 }
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87 DataAccess da = repo.getDataAccess().create(dirstateFile);
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88 if (da.isEmpty()) {
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89 return;
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90 }
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91 // not sure linked is really needed here, just for ease of debug
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92 normal = new LinkedHashMap<Path, Record>();
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93 added = new LinkedHashMap<Path, Record>();
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94 removed = new LinkedHashMap<Path, Record>();
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95 merged = new LinkedHashMap<Path, Record>();
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96 try {
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97 parents = internalReadParents(da);
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98 // hg init; hg up produces an empty repository where dirstate has parents (40 bytes) only
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99 while (!da.isEmpty()) {
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100 final byte state = da.readByte();
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101 final int fmode = da.readInt();
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102 final int size = da.readInt();
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103 final int time = da.readInt();
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104 final int nameLen = da.readInt();
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105 String fn1 = null, fn2 = null;
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106 byte[] name = new byte[nameLen];
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107 da.readBytes(name, 0, nameLen);
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108 for (int i = 0; i < nameLen; i++) {
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109 if (name[i] == 0) {
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110 fn1 = new String(name, 0, i, "UTF-8"); // XXX unclear from documentation what encoding is used there
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111 fn2 = new String(name, i+1, nameLen - i - 1, "UTF-8"); // need to check with different system codepages
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112 break;
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113 }
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114 }
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115 if (fn1 == null) {
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116 fn1 = new String(name);
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117 }
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118 Record r = new Record(fmode, size, time, pathPool.path(fn1), fn2 == null ? null : pathPool.path(fn2));
293
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119 if (canonicalPathRewrite != null) {
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120 Path canonicalPath = pathPool.path(canonicalPathRewrite.rewrite(fn1).toString());
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121 if (canonicalPath != r.name()) { // == as they come from the same pool
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122 assert !canonical2dirstateName.containsKey(canonicalPath); // otherwise there's already a file with same canonical name
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123 // which can't happen for case-insensitive file system (or there's erroneous PathRewrite, perhaps doing smth else)
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124 canonical2dirstateName.put(canonicalPath, r.name());
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125 }
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126 if (fn2 != null) {
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127 // not sure I need copy origin in the map, I don't seem to use it anywhere,
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128 // but I guess I'll have to use it some day.
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129 canonicalPath = pathPool.path(canonicalPathRewrite.rewrite(fn2).toString());
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130 if (canonicalPath != r.copySource()) {
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131 canonical2dirstateName.put(canonicalPath, r.copySource());
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132 }
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133 }
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134 }
10
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135 if (state == 'n') {
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136 normal.put(r.name1, r);
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137 } else if (state == 'a') {
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138 added.put(r.name1, r);
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139 } else if (state == 'r') {
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140 removed.put(r.name1, r);
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141 } else if (state == 'm') {
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142 merged.put(r.name1, r);
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143 } else {
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144 // FIXME log error?
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145 }
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146 }
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147 } catch (IOException ex) {
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148 throw new HgInvalidControlFileException("Dirstate read failed", ex, dirstateFile);
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149 } finally {
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150 da.done();
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151 }
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152 }
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153
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154 private static Pair<Nodeid, Nodeid> internalReadParents(DataAccess da) throws IOException {
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155 byte[] parents = new byte[40];
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156 da.readBytes(parents, 0, 40);
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157 Nodeid n1 = Nodeid.fromBinary(parents, 0);
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158 Nodeid n2 = Nodeid.fromBinary(parents, 20);
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159 parents = null;
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160 return new Pair<Nodeid, Nodeid>(n1, n2);
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161 }
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162
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163 /**
290
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164 * @return pair of working copy parents, with {@link Nodeid#NULL} for missing values.
284
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165 */
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166 public Pair<Nodeid,Nodeid> parents() {
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167 assert parents != null; // instance not initialized with #read()
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168 return parents;
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169 }
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170
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171 /**
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172 * @return pair of parents, both {@link Nodeid#NULL} if dirstate is not available
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173 */
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174 /*package-local*/ static Pair<Nodeid, Nodeid> readParents(HgRepository repo, File dirstateFile) throws HgInvalidControlFileException {
284
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175 // do not read whole dirstate if all we need is WC parent information
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176 if (dirstateFile == null || !dirstateFile.exists()) {
284
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177 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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178 }
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179 DataAccess da = repo.getDataAccess().create(dirstateFile);
231
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180 if (da.isEmpty()) {
284
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181 return new Pair<Nodeid,Nodeid>(NULL, NULL);
231
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182 }
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183 try {
284
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184 return internalReadParents(da);
231
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185 } catch (IOException ex) {
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186 throw new HgInvalidControlFileException("Error reading working copy parents from dirstate", ex, dirstateFile);
231
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187 } finally {
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188 da.done();
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189 }
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190 }
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191
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192 /**
348
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193 * FIXME move to a better place, e.g. WorkingCopy container that tracks both dirstate and branches (and, perhaps, undo, lastcommit and other similar information)
252
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194 * @return branch associated with the working directory
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195 */
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196 public String branch() throws HgInvalidControlFileException {
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197 // XXX is it really proper place for the method?
252
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198 if (currentBranch == null) {
284
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199 currentBranch = readBranch(repo);
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200 }
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201 return currentBranch;
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202 }
284
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203
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204 /**
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205 * XXX is it really proper place for the method?
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206 * @return branch associated with the working directory
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207 */
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208 /*package-local*/ static String readBranch(HgRepository repo) throws HgInvalidControlFileException {
284
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209 String branch = HgRepository.DEFAULT_BRANCH_NAME;
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210 File branchFile = new File(repo.getRepositoryRoot(), "branch");
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211 if (branchFile.exists()) {
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212 try {
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213 BufferedReader r = new BufferedReader(new FileReader(branchFile));
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214 String b = r.readLine();
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215 if (b != null) {
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216 b = b.trim().intern();
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217 }
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218 branch = b == null || b.length() == 0 ? HgRepository.DEFAULT_BRANCH_NAME : b;
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219 r.close();
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220 } catch (FileNotFoundException ex) {
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221 repo.getContext().getLog().debug(HgDirstate.class, ex, null); // log verbose debug, exception might be legal here
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diff changeset
222 // IGNORE
284
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223 } catch (IOException ex) {
348
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224 throw new HgInvalidControlFileException("Error reading file with branch information", ex, branchFile);
284
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225 }
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226 }
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227 return branch;
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228 }
231
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229
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230 // new, modifiable collection
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231 /*package-local*/ TreeSet<Path> all() {
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232 assert normal != null;
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233 TreeSet<Path> rv = new TreeSet<Path>();
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234 @SuppressWarnings("unchecked")
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235 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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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 rv.add(r.name1);
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239 }
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240 }
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241 return rv;
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242 }
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243
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244 /*package-local*/ Record checkNormal(Path fname) {
293
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245 return internalCheck(normal, fname);
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246 }
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247
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248 /*package-local*/ Record checkAdded(Path fname) {
293
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249 return internalCheck(added, fname);
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250 }
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251 /*package-local*/ Record checkRemoved(Path fname) {
293
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252 return internalCheck(removed, fname);
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253 }
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254 /*package-local*/ Record checkMerged(Path fname) {
293
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255 return internalCheck(merged, fname);
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256 }
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257
293
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258
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259 // 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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260 /*package-local*/ Path known(Path fname) {
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261 Path fnameCanonical = null;
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262 if (canonicalPathRewrite != null) {
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263 fnameCanonical = pathPool.path(canonicalPathRewrite.rewrite(fname).toString());
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264 if (fnameCanonical != fname && canonical2dirstateName.containsKey(fnameCanonical)) {
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265 // we know right away there's name in dirstate with alternative canonical form
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266 return canonical2dirstateName.get(fnameCanonical);
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267 }
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268 }
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269 @SuppressWarnings("unchecked")
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270 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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271 for (int i = 0; i < all.length; i++) {
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272 if (all[i].containsKey(fname)) {
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273 return fname;
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274 }
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275 if (fnameCanonical != null && all[i].containsKey(fnameCanonical)) {
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276 return fnameCanonical;
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277 }
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278 }
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279 return null;
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280 }
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281
293
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282 private Record internalCheck(Map<Path, Record> map, Path fname) {
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283 Record rv = map.get(fname);
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284 if (rv != null || canonicalPathRewrite == null) {
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285 return rv;
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286 }
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287 Path fnameCanonical = pathPool.path(canonicalPathRewrite.rewrite(fname).toString());
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288 if (fnameCanonical != fname) {
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289 // case when fname = /a/B/c, and dirstate is /a/b/C
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290 if (canonical2dirstateName.containsKey(fnameCanonical)) {
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291 return map.get(canonical2dirstateName.get(fnameCanonical));
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292 }
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293 // try canonical directly, fname = /a/B/C, dirstate has /a/b/c
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294 if ((rv = map.get(fnameCanonical)) != null) {
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295 return rv;
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296 }
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297 }
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298 return null;
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299 }
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300
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301 public void walk(Inspector inspector) {
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302 assert normal != null;
290
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303 @SuppressWarnings("unchecked")
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304 Map<Path, Record>[] all = new Map[] { normal, added, removed, merged };
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305 for (int i = 0; i < all.length; i++) {
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306 EntryKind k = EntryKind.values()[i];
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307 for (Record r : all[i].values()) {
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308 if (!inspector.next(k, r)) {
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309 return;
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310 }
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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 public interface Inspector {
293
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316 /**
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317 * Invoked for each entry in the directory state file
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318 * @param kind file record kind
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319 * @param entry file record. Note, do not cache instance as it may be reused between the calls
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320 * @return <code>true</code> to indicate further records are still of interest, <code>false</code> to stop iteration
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321 */
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322 boolean next(EntryKind kind, Record entry);
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323 }
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324
293
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325 public static final class Record implements Cloneable {
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326 private final int mode, size, time;
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327 // Dirstate keeps local file size (i.e. that with any filters already applied).
280
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328 // Thus, can't compare directly to HgDataFile.length()
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329 private final Path name1, name2;
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330
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331 /*package-local*/ Record(int fmode, int fsize, int ftime, Path name1, Path name2) {
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332 mode = fmode;
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333 size = fsize;
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334 time = ftime;
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335 this.name1 = name1;
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336 this.name2 = name2;
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337
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338 }
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339
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340 public Path name() {
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341 return name1;
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342 }
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343
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344 /**
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345 * @return non-<code>null</code> for copy/move
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346 */
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347 public Path copySource() {
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348 return name2;
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349 }
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350
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351 public int modificationTime() {
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352 return time;
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353 }
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354
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355 public int size() {
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356 return size;
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357 }
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358
348
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359 public int mode() {
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360 return mode;
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361 }
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362
293
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363 @Override
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364 public Record clone() {
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365 try {
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366 return (Record) super.clone();
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367 } catch (CloneNotSupportedException ex) {
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368 throw new InternalError(ex.toString());
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369 }
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370 }
10
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371 }
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372 }