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annotate src/org/tmatesoft/hg/core/HgCloneCommand.java @ 524:57b2c9eb3c69

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@since tag for HgIterateDirection
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Jan 2013 18:10:29 +0100
parents a41d955dc360
children 0f6fa88e2162
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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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19 import static org.tmatesoft.hg.core.Nodeid.NULL;
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20 import static org.tmatesoft.hg.internal.RequiresFile.*;
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21
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22 import java.io.ByteArrayOutputStream;
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23 import java.io.File;
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24 import java.io.FileOutputStream;
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25 import java.io.IOException;
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26 import java.nio.ByteBuffer;
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27 import java.util.ArrayList;
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28 import java.util.Collections;
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29 import java.util.LinkedList;
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30 import java.util.TreeMap;
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31 import java.util.zip.DeflaterOutputStream;
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33 import org.tmatesoft.hg.internal.ByteArrayDataAccess;
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34 import org.tmatesoft.hg.internal.DataAccess;
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35 import org.tmatesoft.hg.internal.DigestHelper;
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36 import org.tmatesoft.hg.internal.Lifecycle;
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37 import org.tmatesoft.hg.internal.RepoInitializer;
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38 import org.tmatesoft.hg.repo.HgBundle;
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39 import org.tmatesoft.hg.repo.HgBundle.GroupElement;
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40 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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41 import org.tmatesoft.hg.repo.HgInvalidFileException;
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42 import org.tmatesoft.hg.repo.HgInvalidStateException;
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43 import org.tmatesoft.hg.repo.HgLookup;
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44 import org.tmatesoft.hg.repo.HgRemoteRepository;
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45 import org.tmatesoft.hg.repo.HgRepository;
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46 import org.tmatesoft.hg.repo.HgRuntimeException;
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47 import org.tmatesoft.hg.util.CancelSupport;
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48 import org.tmatesoft.hg.util.CancelledException;
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49 import org.tmatesoft.hg.util.PathRewrite;
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50 import org.tmatesoft.hg.util.ProgressSupport;
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51
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52 /**
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53 * WORK IN PROGRESS, DO NOT USE
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54 *
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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 public class HgCloneCommand extends HgAbstractCommand<HgCloneCommand> {
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59
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60 private File destination;
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61 private HgRemoteRepository srcRepo;
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62
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63 public HgCloneCommand() {
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64 }
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65
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66 /**
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67 * @param folder location to become root of the repository (i.e. where <em>.hg</em> folder would reside). Either
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68 * shall not exist or be empty otherwise.
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69 * @return <code>this</code> for convenience
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70 */
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71 public HgCloneCommand destination(File folder) {
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72 destination = folder;
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73 return this;
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74 }
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76 public HgCloneCommand source(HgRemoteRepository hgRemote) {
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77 srcRepo = hgRemote;
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78 return this;
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79 }
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80
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81 /**
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82 *
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83 * @return
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84 * @throws HgBadArgumentException
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85 * @throws HgRemoteConnectionException
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86 * @throws HgRepositoryNotFoundException
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87 * @throws HgException
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88 * @throws CancelledException
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89 * @throws HgRuntimeException subclass thereof to indicate issues with the library. <em>Runtime exception</em>
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90 */
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91 public HgRepository execute() throws HgException, CancelledException {
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92 if (destination == null) {
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93 throw new IllegalArgumentException("Destination not set", null);
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94 }
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95 if (srcRepo == null || srcRepo.isInvalid()) {
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96 throw new HgBadArgumentException("Bad source repository", null);
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97 }
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98 if (destination.exists()) {
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99 if (!destination.isDirectory()) {
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100 throw new HgBadArgumentException(String.format("%s is not a directory", destination), null);
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101 } else if (destination.list().length > 0) {
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102 throw new HgBadArgumentException(String.format("% shall be empty", destination), null);
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103 }
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104 } else {
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105 destination.mkdirs();
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106 }
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107 ProgressSupport progress = getProgressSupport(null);
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108 CancelSupport cancel = getCancelSupport(null, true);
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109 cancel.checkCancelled();
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110 // if cloning remote repo, which can stream and no revision is specified -
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111 // can use 'stream_out' wireproto
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112 //
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113 // pull all changes from the very beginning
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114 // XXX consult getContext() if by any chance has a bundle ready, if not, then read and register
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115 HgBundle completeChanges = srcRepo.getChanges(Collections.singletonList(NULL));
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116 cancel.checkCancelled();
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117 WriteDownMate mate = new WriteDownMate(srcRepo.getSessionContext(), destination, progress, cancel);
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118 try {
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119 // instantiate new repo in the destdir
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120 mate.initEmptyRepository();
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121 // pull changes
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122 completeChanges.inspectAll(mate);
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123 mate.checkFailure();
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124 mate.complete();
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125 } catch (IOException ex) {
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126 throw new HgInvalidFileException(getClass().getName(), ex);
186
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127 } finally {
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128 completeChanges.unlink();
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129 progress.done();
186
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130 }
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131 return new HgLookup().detect(destination);
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132 }
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133
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134
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135 // 1. process changelog, memorize nodeids to index
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136 // 2. process manifest, using map from step 3, collect manifest nodeids
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137 // 3. process every file, using map from 3, and consult set from step 4 to ensure repo is correct
512
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138 private static class WriteDownMate implements HgBundle.Inspector, Lifecycle {
186
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139 private final File hgDir;
190
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140 private final PathRewrite storagePathHelper;
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141 private final ProgressSupport progressSupport;
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142 private final CancelSupport cancelSupport;
186
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143 private FileOutputStream indexFile;
190
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144 private String filename; // human-readable name of the file being written, for log/exception purposes
186
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145
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146 private final TreeMap<Nodeid, Integer> changelogIndexes = new TreeMap<Nodeid, Integer>();
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147 private boolean collectChangelogIndexes = false;
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148
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149 private int base = -1;
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150 private long offset = 0;
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151 private DataAccess prevRevContent;
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152 private final DigestHelper dh = new DigestHelper();
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153 private final ArrayList<Nodeid> revisionSequence = new ArrayList<Nodeid>(); // last visited nodes first
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154
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155 private final LinkedList<String> fncacheFiles = new LinkedList<String>();
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156 private RepoInitializer repoInit;
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157 private Lifecycle.Callback lifecycleCallback;
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158 private CancelledException cancelException;
186
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159
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160 public WriteDownMate(SessionContext ctx, File destDir, ProgressSupport progress, CancelSupport cancel) {
186
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161 hgDir = new File(destDir, ".hg");
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162 repoInit = new RepoInitializer();
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163 repoInit.setRequires(STORE | FNCACHE | DOTENCODE);
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164 storagePathHelper = repoInit.buildDataFilesHelper(ctx);
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165 progressSupport = progress;
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166 cancelSupport = cancel;
186
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167 }
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168
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169 public void initEmptyRepository() throws IOException {
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170 repoInit.initEmptyRepository(hgDir);
186
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171 }
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172
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173 public void complete() throws IOException {
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174 FileOutputStream fncacheFile = new FileOutputStream(new File(hgDir, "store/fncache"));
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175 for (String s : fncacheFiles) {
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176 fncacheFile.write(s.getBytes());
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177 fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
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178 }
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179 fncacheFile.close();
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180 }
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181
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182 public void changelogStart() {
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183 try {
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184 base = -1;
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185 offset = 0;
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186 revisionSequence.clear();
190
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187 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00changelog.i"));
186
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188 collectChangelogIndexes = true;
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189 } catch (IOException ex) {
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190 throw new HgInvalidControlFileException("Failed to write changelog", ex, new File(filename));
186
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191 }
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192 stopIfCancelled();
186
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193 }
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194
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195 public void changelogEnd() {
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196 try {
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197 if (prevRevContent != null) {
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198 prevRevContent.done();
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199 prevRevContent = null;
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200 }
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201 collectChangelogIndexes = false;
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202 indexFile.close();
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203 indexFile = null;
190
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204 filename = null;
186
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205 } catch (IOException ex) {
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206 throw new HgInvalidControlFileException("Failed to write changelog", ex, new File(filename));
186
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207 }
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208 progressSupport.worked(1);
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209 stopIfCancelled();
186
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210 }
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211
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212 public void manifestStart() {
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213 try {
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214 base = -1;
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215 offset = 0;
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216 revisionSequence.clear();
190
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217 indexFile = new FileOutputStream(new File(hgDir, filename = "store/00manifest.i"));
186
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218 } catch (IOException ex) {
423
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219 throw new HgInvalidControlFileException("Failed to write manifest", ex, new File(filename));
186
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220 }
513
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221 stopIfCancelled();
186
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222 }
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223
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224 public void manifestEnd() {
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225 try {
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226 if (prevRevContent != null) {
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227 prevRevContent.done();
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228 prevRevContent = null;
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229 }
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230 indexFile.close();
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231 indexFile = null;
190
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232 filename = null;
186
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233 } catch (IOException ex) {
423
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234 throw new HgInvalidControlFileException("Failed to write changelog", ex, new File(filename));
186
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235 }
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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236 progressSupport.worked(1);
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237 stopIfCancelled();
186
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238 }
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239
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240 public void fileStart(String name) {
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241 try {
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242 base = -1;
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243 offset = 0;
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244 revisionSequence.clear();
418
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245 fncacheFiles.add("data/" + name + ".i"); // TODO post-1.0 this is pure guess,
186
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246 // need to investigate more how filenames are kept in fncache
292
a415fe296a50 Refactor PathRewrite to accept any char sequence, not only string
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247 File file = new File(hgDir, filename = storagePathHelper.rewrite(name).toString());
186
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248 file.getParentFile().mkdirs();
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249 indexFile = new FileOutputStream(file);
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250 } catch (IOException ex) {
423
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251 String m = String.format("Failed to write file %s", filename);
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252 throw new HgInvalidControlFileException(m, ex, new File(filename));
186
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253 }
513
a41d955dc360 Issue 39: HgCloneCommand doesn't use CancelSupport/ProgressSupport handlers
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254 stopIfCancelled();
186
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255 }
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256
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257 public void fileEnd(String name) {
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258 try {
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259 if (prevRevContent != null) {
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260 prevRevContent.done();
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261 prevRevContent = null;
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262 }
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263 indexFile.close();
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264 indexFile = null;
190
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diff changeset
265 filename = null;
186
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266 } catch (IOException ex) {
423
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267 String m = String.format("Failed to write file %s", filename);
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268 throw new HgInvalidControlFileException(m, ex, new File(filename));
186
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269 }
513
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diff changeset
270 progressSupport.worked(1);
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271 stopIfCancelled();
186
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272 }
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273
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274 private int knownRevision(Nodeid p) {
274
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275 if (p.isNull()) {
186
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276 return -1;
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277 } else {
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278 for (int i = revisionSequence.size() - 1; i >= 0; i--) {
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279 if (revisionSequence.get(i).equals(p)) {
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280 return i;
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281 }
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282 }
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283 }
423
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284 String m = String.format("Can't find index of %s for file %s", p.shortNotation(), filename);
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285 throw new HgInvalidControlFileException(m, null, null).setRevision(p);
186
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286 }
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287
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288 public boolean element(GroupElement ge) {
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289 try {
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290 assert indexFile != null;
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291 boolean writeComplete = false;
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292 Nodeid p1 = ge.firstParent();
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293 Nodeid p2 = ge.secondParent();
274
9fb50c04f03c Use Nodeid.isNull check instead of NULL.equals
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diff changeset
294 if (p1.isNull() && p2.isNull() /* or forced flag, does REVIDX_PUNCHED_FLAG indicate that? */) {
186
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295 prevRevContent = new ByteArrayDataAccess(new byte[0]);
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296 writeComplete = true;
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297 }
358
fc8bc2f1edbe Clean internal classes from public API
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diff changeset
298 byte[] content = ge.apply(prevRevContent.byteArray());
186
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299 byte[] calculated = dh.sha1(p1, p2, content).asBinary();
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300 final Nodeid node = ge.node();
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diff changeset
301 if (!node.equalsTo(calculated)) {
423
9c9c442b5f2e Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
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diff changeset
302 // TODO post-1.0 custom exception ChecksumCalculationFailed?
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diff changeset
303 throw new HgInvalidStateException(String.format("Checksum failed: expected %s, calculated %s. File %s", node, calculated, filename));
186
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304 }
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305 final int link;
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306 if (collectChangelogIndexes) {
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307 changelogIndexes.put(node, revisionSequence.size());
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308 link = revisionSequence.size();
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309 } else {
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diff changeset
310 Integer csRev = changelogIndexes.get(ge.cset());
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diff changeset
311 if (csRev == null) {
423
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diff changeset
312 throw new HgInvalidStateException(String.format("Changelog doesn't contain revision %s of %s", ge.cset().shortNotation(), filename));
186
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313 }
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314 link = csRev.intValue();
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315 }
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316 final int p1Rev = knownRevision(p1), p2Rev = knownRevision(p2);
358
fc8bc2f1edbe Clean internal classes from public API
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diff changeset
317 byte[] patchContent = ge.rawDataByteArray();
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318 writeComplete = writeComplete || patchContent.length >= (/* 3/4 of actual */content.length - (content.length >>> 2));
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319 if (writeComplete) {
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320 base = revisionSequence.size();
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321 }
358
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322 final byte[] sourceData = writeComplete ? content : patchContent;
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323 final byte[] data;
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324 ByteArrayOutputStream bos = new ByteArrayOutputStream(content.length);
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325 DeflaterOutputStream dos = new DeflaterOutputStream(bos);
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326 dos.write(sourceData);
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327 dos.close();
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328 final byte[] compressedData = bos.toByteArray();
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329 dos = null;
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330 bos = null;
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331 final Byte dataPrefix;
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332 if (compressedData.length >= (sourceData.length - (sourceData.length >>> 2))) {
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333 // compression wasn't too effective,
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334 data = sourceData;
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335 dataPrefix = 'u';
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336 } else {
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337 data = compressedData;
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338 dataPrefix = null;
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339 }
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340
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341 ByteBuffer header = ByteBuffer.allocate(64 /* REVLOGV1_RECORD_SIZE */);
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342 if (offset == 0) {
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343 final int INLINEDATA = 1 << 16;
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344 header.putInt(1 /* RevlogNG */ | INLINEDATA);
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345 header.putInt(0);
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346 } else {
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347 header.putLong(offset << 16);
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348 }
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349 final int compressedLen = data.length + (dataPrefix == null ? 0 : 1);
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350 header.putInt(compressedLen);
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351 header.putInt(content.length);
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352 header.putInt(base);
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353 header.putInt(link);
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354 header.putInt(p1Rev);
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355 header.putInt(p2Rev);
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356 header.put(node.toByteArray());
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357 // assume 12 bytes left are zeros
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358 indexFile.write(header.array());
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359 if (dataPrefix != null) {
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360 indexFile.write(dataPrefix.byteValue());
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361 }
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362 indexFile.write(data);
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363 //
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364 offset += compressedLen;
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365 revisionSequence.add(node);
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366 prevRevContent.done();
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367 prevRevContent = new ByteArrayDataAccess(content);
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368 } catch (IOException ex) {
423
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369 String m = String.format("Failed to write revision %s of file %s", ge.node().shortNotation(), filename);
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370 throw new HgInvalidControlFileException(m, ex, new File(filename));
186
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371 }
513
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372 return cancelException == null;
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373 }
512
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374
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375 public void start(int count, Callback callback, Object token) {
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376 progressSupport.start(count);
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377 lifecycleCallback = callback;
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378 }
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379
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380 public void finish(Object token) {
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381 progressSupport.done();
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382 lifecycleCallback = null;
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383 }
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384
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385 public void checkFailure() throws CancelledException {
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386 if (cancelException != null) {
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387 throw cancelException;
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388 }
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389 }
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390
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391 private void stopIfCancelled() {
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392 try {
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393 cancelSupport.checkCancelled();
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394 return;
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395 } catch (CancelledException ex) {
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396 cancelException = ex;
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397 lifecycleCallback.stop();
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398 }
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399 }
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400 }
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401 }