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annotate src/org/tmatesoft/hg/core/HgCheckoutCommand.java @ 608:e1b29756f901

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Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 21:27:51 +0200
parents 0890628ed51e
children f41dd9a3b8af
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1 /*
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2 * Copyright (c) 2012-2013 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.core;
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18
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19 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Branch;
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20 import static org.tmatesoft.hg.repo.HgRepositoryFiles.Dirstate;
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21
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22 import java.io.File;
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23 import java.io.FileOutputStream;
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24 import java.io.IOException;
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25 import java.io.OutputStreamWriter;
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26 import java.nio.channels.FileChannel;
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27
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28 import org.tmatesoft.hg.internal.CsetParamKeeper;
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29 import org.tmatesoft.hg.internal.DirstateBuilder;
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30 import org.tmatesoft.hg.internal.EncodingHelper;
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31 import org.tmatesoft.hg.internal.Experimental;
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32 import org.tmatesoft.hg.internal.Internals;
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33 import org.tmatesoft.hg.internal.WorkingDirFileWriter;
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34 import org.tmatesoft.hg.repo.HgDataFile;
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35 import org.tmatesoft.hg.repo.HgDirstate;
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36 import org.tmatesoft.hg.repo.HgDirstate.EntryKind;
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37 import org.tmatesoft.hg.repo.HgDirstate.Record;
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38 import org.tmatesoft.hg.repo.HgInternals;
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39 import org.tmatesoft.hg.repo.HgManifest;
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40 import org.tmatesoft.hg.repo.HgManifest.Flags;
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41 import org.tmatesoft.hg.repo.HgRepository;
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42 import org.tmatesoft.hg.repo.HgRuntimeException;
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43 import org.tmatesoft.hg.util.CancelSupport;
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44 import org.tmatesoft.hg.util.CancelledException;
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45 import org.tmatesoft.hg.util.Path;
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46 import org.tmatesoft.hg.util.ProgressSupport;
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47
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48 /**
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49 * WORK IN PROGRESS.
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50 *
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51 * Update working directory to specific state, 'hg checkout' counterpart.
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52 * For the time being, only 'clean' checkout is supported ('hg co --clean')
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53 *
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54 * @since 1.1
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55 * @author Artem Tikhomirov
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56 * @author TMate Software Ltd.
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57 */
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58 @Experimental(reason="Work in progress")
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59 public class HgCheckoutCommand extends HgAbstractCommand<HgCheckoutCommand>{
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60
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61 private final HgRepository repo;
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62 private final CsetParamKeeper revisionToCheckout;
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63 private boolean cleanCheckout;
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64
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65 public HgCheckoutCommand(HgRepository hgRepo) {
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66 repo = hgRepo;
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67 revisionToCheckout = new CsetParamKeeper(repo);
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68 }
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69
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70 /**
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71 * Whether to discard all uncommited changes prior to check-out.
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72 *
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73 * NOTE, at the moment, only clean checkout is supported!
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74 *
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75 * @param clean <code>true</code> to discard any change
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76 * @return <code>this</code> for convenience
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77 */
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78 public HgCheckoutCommand clean(boolean clean) {
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79 cleanCheckout = clean;
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80 return this;
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81 }
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82
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83 /**
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84 * Select revision to check out
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85 *
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86 * @param nodeid revision
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87 * @return <code>this</code> for convenience
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88 * @throws HgBadArgumentException if failed to find supplied changeset
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89 */
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90 public HgCheckoutCommand changeset(Nodeid nodeid) throws HgBadArgumentException {
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91 revisionToCheckout.set(nodeid);
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92 return this;
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93 }
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94
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95 /**
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96 * Select revision to check out using local revision index
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97 *
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98 * @param changesetIndex local changelog revision index, or {@link HgRepository#TIP}
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99 * @return <code>this</code> for convenience
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100 * @throws HgBadArgumentException if failed to find supplied changeset
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101 */
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102 public HgCheckoutCommand changeset(int changesetIndex) throws HgBadArgumentException {
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103 revisionToCheckout.set(changesetIndex);
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104 return this;
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105 }
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106
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107 /**
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108 * Update working copy to match state of the selected revision.
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109 *
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110 * @throws HgIOException to indicate troubles updating files in working copy
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111 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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112 * @throws CancelledException if execution of the command was cancelled
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113 */
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114 public void execute() throws HgException, CancelledException {
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115 try {
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116 final ProgressSupport progress = getProgressSupport(null);
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117 final CancelSupport cancellation = getCancelSupport(null, true);
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118 cancellation.checkCancelled();
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119 progress.start(6);
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120 Internals internalRepo = Internals.getInstance(repo);
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121 if (cleanCheckout) {
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122 // remove tracked files from wd (perhaps, just forget 'Added'?)
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123 // for now, just delete each and every tracked file
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124 // TODO WorkingCopy container with getFile(HgDataFile/Path) to access files in WD
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125 HgDirstate dirstate = new HgInternals(repo).getDirstate();
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126 dirstate.walk(new HgDirstate.Inspector() {
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127
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128 public boolean next(EntryKind kind, Record entry) {
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129 File f = new File(repo.getWorkingDir(), entry.name().toString());
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130 if (f.exists()) {
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131 f.delete();
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132 }
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133 return true;
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134 }
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135 });
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136 } else {
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137 throw new HgBadArgumentException("Sorry, only clean checkout is supported now, use #clean(true)", null);
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138 }
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139 progress.worked(1);
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140 cancellation.checkCancelled();
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141 final DirstateBuilder dirstateBuilder = new DirstateBuilder(internalRepo);
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142 final CheckoutWorker worker = new CheckoutWorker(internalRepo);
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143 HgManifest.Inspector insp = new HgManifest.Inspector() {
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144
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145 public boolean next(Nodeid nid, Path fname, Flags flags) {
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146 if (worker.next(nid, fname, flags)) {
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147 // Mercurial seems to write "n 0 -1 unset fname" on `hg --clean co -rev <earlier rev>`
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148 // and the reason for 'force lookup' I suspect is a slight chance of simultaneous modification
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149 // of the file by user that doesn't alter its size the very second dirstate is being written
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150 // (or the file is being updated and the update brought in changes that didn't alter the file size -
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151 // with size and timestamp set, later `hg status` won't notice these changes)
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152
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153 // However, as long as we use this class to write clean copies of the files, we can put all the fields
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154 // right away.
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155 int mtime = worker.getLastFileModificationTime();
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156 // Manifest flags are chars (despite octal values `hg manifest --debug` displays),
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157 // while dirstate keeps actual unix flags.
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158 int fmode = worker.getLastFileMode();
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159 dirstateBuilder.recordNormal(fname, fmode, mtime, worker.getLastFileSize());
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160 return true;
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161 }
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162 return false;
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163 }
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164
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165 public boolean end(int manifestRevision) {
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166 return false;
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167 }
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168
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169 public boolean begin(int mainfestRevision, Nodeid nid, int changelogRevision) {
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170 return true;
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171 }
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172 };
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173 // checkout tip if no revision set
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174 final int coRevision = revisionToCheckout.get(HgRepository.TIP);
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175 dirstateBuilder.parents(repo.getChangelog().getRevision(coRevision), null);
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176 repo.getManifest().walk(coRevision, coRevision, insp);
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177 worker.checkFailed();
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178 progress.worked(3);
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179 cancellation.checkCancelled();
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180 File dirstateFile = internalRepo.getRepositoryFile(Dirstate);
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181 try {
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182 FileChannel dirstateFileChannel = new FileOutputStream(dirstateFile).getChannel();
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183 dirstateBuilder.serialize(dirstateFileChannel);
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184 dirstateFileChannel.close();
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185 } catch (IOException ex) {
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186 throw new HgIOException("Can't write down new directory state", ex, dirstateFile);
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187 }
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188 progress.worked(1);
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189 cancellation.checkCancelled();
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190 String branchName = repo.getChangelog().range(coRevision, coRevision).get(0).branch();
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191 assert branchName != null;
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192 File branchFile = internalRepo.getRepositoryFile(Branch);
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193 if (HgRepository.DEFAULT_BRANCH_NAME.equals(branchName)) {
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194 // clean actual branch, if any
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195 if (branchFile.isFile()) {
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196 branchFile.delete();
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197 }
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198 } else {
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199 try {
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200 // branch file is UTF-8, see http://mercurial.selenic.com/wiki/EncodingStrategy#UTF-8_strings
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201 OutputStreamWriter ow = new OutputStreamWriter(new FileOutputStream(branchFile), EncodingHelper.getUTF8());
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202 ow.write(branchName);
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203 ow.close();
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204 } catch (IOException ex) {
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205 throw new HgIOException("Can't write down branch information", ex, branchFile);
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206 }
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207 }
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208 progress.worked(1);
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209 progress.done();
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210 } catch (HgRuntimeException ex) {
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211 throw new HgLibraryFailureException(ex);
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212 }
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213 }
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214
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215 static class CheckoutWorker {
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216 private final Internals hgRepo;
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217 private HgException failure;
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218 private int lastWrittenFileSize;
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219 private int lastFileMode;
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220 private int lastFileModificationTime;
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221
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222 CheckoutWorker(Internals implRepo) {
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223 hgRepo = implRepo;
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224 }
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225
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226 public boolean next(Nodeid nid, Path fname, Flags flags) {
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227 WorkingDirFileWriter workingDirWriter = null;
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228 try {
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229 HgDataFile df = hgRepo.getRepo().getFileNode(fname);
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230 int fileRevIndex = df.getRevisionIndex(nid);
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231 // check out files based on manifest
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232 workingDirWriter = new WorkingDirFileWriter(hgRepo);
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233 workingDirWriter.processFile(df, fileRevIndex, flags);
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234 lastWrittenFileSize = workingDirWriter.bytesWritten();
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235 lastFileMode = workingDirWriter.fmode();
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236 lastFileModificationTime = workingDirWriter.mtime();
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237 return true;
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238 } catch (IOException ex) {
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239 failure = new HgIOException("Failed to write down file revision", ex, workingDirWriter.getDestinationFile());
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240 } catch (HgRuntimeException ex) {
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241 failure = new HgLibraryFailureException(ex);
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242 }
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243 return false;
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244 }
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245
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246 public int getLastFileMode() {
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247 return lastFileMode;
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248 }
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249
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250 public int getLastFileModificationTime() {
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251 return lastFileModificationTime;
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252 }
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253
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254 public int getLastFileSize() {
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255 return lastWrittenFileSize;
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256 }
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257
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258 public void checkFailed() throws HgException {
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259 if (failure != null) {
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260 throw failure;
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261 }
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262 }
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263 };
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264 }