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annotate src/org/tmatesoft/hg/repo/HgWorkingCopyStatusCollector.java @ 227:0fd10e5016dd

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IOException on empty repository with 40-byte dirstate
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 25 May 2011 13:13:36 +0200
parents 26ad7827a62d
children 1ec6b327a6ac
rev   line source
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1 /*
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2 * Copyright (c) 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 java.lang.Math.max;
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20 import static java.lang.Math.min;
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21 import static org.tmatesoft.hg.repo.HgRepository.*;
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22 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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23 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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25 import java.io.File;
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26 import java.io.FileInputStream;
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27 import java.io.IOException;
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28 import java.nio.ByteBuffer;
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29 import java.nio.channels.FileChannel;
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30 import java.util.Collections;
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31 import java.util.NoSuchElementException;
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32 import java.util.Set;
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33 import java.util.TreeSet;
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34
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35 import org.tmatesoft.hg.core.HgDataStreamException;
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36 import org.tmatesoft.hg.core.HgException;
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37 import org.tmatesoft.hg.core.Nodeid;
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38 import org.tmatesoft.hg.internal.ByteArrayChannel;
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39 import org.tmatesoft.hg.internal.Experimental;
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40 import org.tmatesoft.hg.internal.FilterByteChannel;
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41 import org.tmatesoft.hg.internal.RelativePathRewrite;
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42 import org.tmatesoft.hg.repo.HgStatusCollector.ManifestRevisionInspector;
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43 import org.tmatesoft.hg.util.ByteChannel;
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44 import org.tmatesoft.hg.util.CancelledException;
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45 import org.tmatesoft.hg.util.FileIterator;
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46 import org.tmatesoft.hg.util.FileWalker;
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47 import org.tmatesoft.hg.util.Path;
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48 import org.tmatesoft.hg.util.PathPool;
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49 import org.tmatesoft.hg.util.PathRewrite;
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51 /**
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52 *
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53 * @author Artem Tikhomirov
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54 * @author TMate Software Ltd.
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55 */
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56 public class HgWorkingCopyStatusCollector {
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58 private final HgRepository repo;
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59 private final FileIterator repoWalker;
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60 private HgDirstate dirstate;
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61 private HgStatusCollector baseRevisionCollector;
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62 private PathPool pathPool;
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63
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64 public HgWorkingCopyStatusCollector(HgRepository hgRepo) {
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65 this(hgRepo, hgRepo.createWorkingDirWalker());
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66 }
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67
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68 HgWorkingCopyStatusCollector(HgRepository hgRepo, FileIterator hgRepoWalker) {
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69 repo = hgRepo;
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70 repoWalker = hgRepoWalker;
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71 }
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73 /**
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74 * Optionally, supply a collector instance that may cache (or have already cached) base revision
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75 * @param sc may be null
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76 */
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77 public void setBaseRevisionCollector(HgStatusCollector sc) {
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78 baseRevisionCollector = sc;
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79 }
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81 /*package-local*/ PathPool getPathPool() {
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82 if (pathPool == null) {
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83 if (baseRevisionCollector == null) {
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84 pathPool = new PathPool(new PathRewrite.Empty());
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85 } else {
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86 return baseRevisionCollector.getPathPool();
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87 }
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88 }
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89 return pathPool;
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90 }
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91
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92 public void setPathPool(PathPool pathPool) {
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93 this.pathPool = pathPool;
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94 }
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95
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97 private HgDirstate getDirstate() {
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98 if (dirstate == null) {
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99 dirstate = repo.loadDirstate();
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100 }
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101 return dirstate;
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102 }
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103
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104 // may be invoked few times
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105 public void walk(int baseRevision, HgStatusInspector inspector) {
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106 if (HgInternals.wrongLocalRevision(baseRevision) || baseRevision == BAD_REVISION || baseRevision == WORKING_COPY) {
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107 throw new IllegalArgumentException(String.valueOf(baseRevision));
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108 }
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109 final HgIgnore hgIgnore = repo.getIgnore();
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110 TreeSet<String> knownEntries = getDirstate().all();
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111 final boolean isTipBase;
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112 if (baseRevision == TIP) {
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113 baseRevision = repo.getChangelog().getLastRevision();
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114 isTipBase = true;
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115 } else {
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116 isTipBase = baseRevision == repo.getChangelog().getLastRevision();
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117 }
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118 HgStatusCollector.ManifestRevisionInspector collect = null;
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119 Set<String> baseRevFiles = Collections.emptySet(); // files from base revision not affected by status calculation
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120 if (!isTipBase) {
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121 if (baseRevisionCollector != null) {
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122 collect = baseRevisionCollector.raw(baseRevision);
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123 } else {
195
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124 collect = new HgStatusCollector.ManifestRevisionInspector(null, null);
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125 repo.getManifest().walk(baseRevision, baseRevision, collect);
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126 }
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127 baseRevFiles = new TreeSet<String>(collect.files());
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128 }
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129 if (inspector instanceof HgStatusCollector.Record) {
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130 HgStatusCollector sc = baseRevisionCollector == null ? new HgStatusCollector(repo) : baseRevisionCollector;
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131 ((HgStatusCollector.Record) inspector).init(baseRevision, BAD_REVISION, sc);
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132 }
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133 repoWalker.reset();
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134 final PathPool pp = getPathPool();
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135 while (repoWalker.hasNext()) {
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136 repoWalker.next();
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137 Path fname = pp.path(repoWalker.name());
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138 File f = repoWalker.file();
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139 assert f.isFile();
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140 if (!f.exists()) {
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141 // file coming from iterator doesn't exist.
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142 if (knownEntries.remove(fname.toString())) {
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143 if (getDirstate().checkRemoved(fname) == null) {
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144 inspector.missing(fname);
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145 } else {
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146 inspector.removed(fname);
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147 }
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148 // do not report it as removed later
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149 if (collect != null) {
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150 baseRevFiles.remove(fname.toString());
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151 }
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152 } else {
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153 // chances are it was known in baseRevision. We may rely
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154 // that later iteration over baseRevFiles leftovers would yield correct Removed,
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155 // but it doesn't hurt to be explicit (provided we know fname *is* inScope of the FileIterator
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156 if (collect != null && baseRevFiles.remove(fname.toString())) {
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157 inspector.removed(fname);
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158 } else {
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159 // not sure I shall report such files (i.e. arbitrary name coming from FileIterator)
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160 // as unknown. Command-line HG aborts "system can't find the file specified"
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161 // in similar case (against wc), or just gives nothing if --change <rev> is specified.
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162 // however, as it's unlikely to get unexisting files from FileIterator, and
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163 // its better to see erroneous file status rather than not to see any (which is too easy
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164 // to overlook), I think unknown() is reasonable approach here
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165 inspector.unknown(fname);
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166 }
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167 }
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168 continue;
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169 }
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170 if (knownEntries.remove(fname.toString())) {
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171 // tracked file.
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172 // modified, added, removed, clean
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173 if (collect != null) { // need to check against base revision, not FS file
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174 checkLocalStatusAgainstBaseRevision(baseRevFiles, collect, baseRevision, fname, f, inspector);
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175 } else {
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176 checkLocalStatusAgainstFile(fname, f, inspector);
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177 }
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178 } else {
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179 if (hgIgnore.isIgnored(fname)) { // hgignore shall be consulted only for non-tracked files
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180 inspector.ignored(fname);
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181 } else {
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182 inspector.unknown(fname);
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183 }
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184 // the file is not tracked. Even if it's known at baseRevision, we don't need to remove it
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185 // from baseRevFiles, it might need to be reported as removed as well (cmdline client does
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186 // yield two statuses for the same file)
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187 }
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188 }
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189 if (collect != null) {
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190 for (String r : baseRevFiles) {
226
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191 final Path fromBase = pp.path(r);
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192 if (repoWalker.inScope(fromBase)) {
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193 inspector.removed(fromBase);
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194 }
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195 }
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196 }
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197 for (String m : knownEntries) {
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198 if (!repoWalker.inScope(pp.path(m))) {
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199 // do not report as missing/removed those FileIterator doesn't care about.
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200 continue;
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201 }
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202 // missing known file from a working dir
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203 if (getDirstate().checkRemoved(m) == null) {
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204 // not removed from the repository = 'deleted'
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205 inspector.missing(pp.path(m));
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206 } else {
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207 // removed from the repo
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208 // if we check against non-tip revision, do not report files that were added past that revision and now removed.
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209 if (collect == null || baseRevFiles.contains(m)) {
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210 inspector.removed(pp.path(m));
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211 }
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212 }
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213 }
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214 }
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215
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216 public HgStatusCollector.Record status(int baseRevision) {
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217 HgStatusCollector.Record rv = new HgStatusCollector.Record();
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218 walk(baseRevision, rv);
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219 return rv;
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220 }
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221
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222 //********************************************
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223
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224
141
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225 private void checkLocalStatusAgainstFile(Path fname, File f, HgStatusInspector inspector) {
58
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226 HgDirstate.Record r;
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227 if ((r = getDirstate().checkNormal(fname)) != null) {
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228 // either clean or modified
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229 if (f.lastModified() / 1000 == r.time && r.size == f.length()) {
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230 inspector.clean(getPathPool().path(fname));
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231 } else {
120
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232 // check actual content to avoid false modified files
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233 HgDataFile df = repo.getFileNode(fname);
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234 if (!areTheSame(f, df, HgRepository.TIP)) {
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235 inspector.modified(df.getPath());
180
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236 } else {
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237 inspector.clean(df.getPath());
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238 }
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239 }
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240 } else if ((r = getDirstate().checkAdded(fname)) != null) {
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241 if (r.name2 == null) {
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242 inspector.added(getPathPool().path(fname));
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243 } else {
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244 inspector.copied(getPathPool().path(r.name2), getPathPool().path(fname));
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245 }
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246 } else if ((r = getDirstate().checkRemoved(fname)) != null) {
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247 inspector.removed(getPathPool().path(fname));
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248 } else if ((r = getDirstate().checkMerged(fname)) != null) {
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249 inspector.modified(getPathPool().path(fname));
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250 }
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251 }
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252
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253 // XXX refactor checkLocalStatus methods in more OO way
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254 private void checkLocalStatusAgainstBaseRevision(Set<String> baseRevNames, ManifestRevisionInspector collect, int baseRevision, Path fname, File f, HgStatusInspector inspector) {
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255 // fname is in the dirstate, either Normal, Added, Removed or Merged
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256 Nodeid nid1 = collect.nodeid(fname.toString());
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257 String flags = collect.flags(fname.toString());
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258 HgDirstate.Record r;
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259 if (nid1 == null) {
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260 // normal: added?
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261 // added: not known at the time of baseRevision, shall report
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262 // merged: was not known, report as added?
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263 if ((r = getDirstate().checkNormal(fname)) != null) {
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264 try {
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265 Path origin = HgStatusCollector.getOriginIfCopy(repo, fname, baseRevNames, baseRevision);
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266 if (origin != null) {
226
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267 inspector.copied(getPathPool().path(origin), fname);
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268 return;
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269 }
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270 } catch (HgDataStreamException ex) {
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271 ex.printStackTrace();
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272 // FIXME report to a mediator, continue status collection
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273 }
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274 } else if ((r = getDirstate().checkAdded(fname)) != null) {
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275 if (r.name2 != null && baseRevNames.contains(r.name2)) {
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276 baseRevNames.remove(r.name2); // XXX surely I shall not report rename source as Removed?
226
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277 inspector.copied(getPathPool().path(r.name2), fname);
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278 return;
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279 }
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280 // fall-through, report as added
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281 } else if (getDirstate().checkRemoved(fname) != null) {
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282 // removed: removed file was not known at the time of baseRevision, and we should not report it as removed
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283 return;
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284 }
226
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285 inspector.added(fname);
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286 } else {
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287 // was known; check whether clean or modified
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288 // when added - seems to be the case of a file added once again, hence need to check if content is different
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289 if ((r = getDirstate().checkNormal(fname)) != null || (r = getDirstate().checkMerged(fname)) != null || (r = getDirstate().checkAdded(fname)) != null) {
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290 // either clean or modified
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291 HgDataFile fileNode = repo.getFileNode(fname);
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292 final int lengthAtRevision = fileNode.length(nid1);
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293 if (r.size /* XXX File.length() ?! */ != lengthAtRevision || flags != todoGenerateFlags(fname /*java.io.File*/)) {
226
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294 inspector.modified(fname);
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295 } else {
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296 // check actual content to see actual changes
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297 if (areTheSame(f, fileNode, fileNode.getLocalRevision(nid1))) {
226
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298 inspector.clean(fname);
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299 } else {
226
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300 inspector.modified(fname);
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301 }
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302 }
226
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303 baseRevNames.remove(fname.toString()); // consumed, processed, handled.
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304 } else if (getDirstate().checkRemoved(fname) != null) {
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305 // was known, and now marked as removed, report it right away, do not rely on baseRevNames processing later
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306 inspector.removed(fname);
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307 baseRevNames.remove(fname.toString()); // consumed, processed, handled.
58
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308 }
226
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309 // only those left in baseRevNames after processing are reported as removed
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310 }
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311
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312 // TODO think over if content comparison may be done more effectively by e.g. calculating nodeid for a local file and comparing it with nodeid from manifest
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313 // we don't need to tell exact difference, hash should be enough to detect difference, and it doesn't involve reading historical file content, and it's relatively
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314 // cheap to calc hash on a file (no need to keep it completely in memory). OTOH, if I'm right that the next approach is used for nodeids:
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315 // changeset nodeid + hash(actual content) => entry (Nodeid) in the next Manifest
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316 // then it's sufficient to check parents from dirstate, and if they do not match parents from file's baseRevision (non matching parents means different nodeids).
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317 // The question is whether original Hg treats this case (same content, different parents and hence nodeids) as 'modified' or 'clean'
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318 }
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319
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320 private boolean areTheSame(File f, HgDataFile dataFile, int localRevision) {
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321 // XXX consider adding HgDataDile.compare(File/byte[]/whatever) operation to optimize comparison
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322 ByteArrayChannel bac = new ByteArrayChannel();
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323 boolean ioFailed = false;
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324 try {
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325 // need content with metadata striped off - although theoretically chances are metadata may be different,
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326 // WC doesn't have it anyway
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327 dataFile.content(localRevision, bac);
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328 } catch (CancelledException ex) {
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329 // silently ignore - can't happen, ByteArrayChannel is not cancellable
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330 } catch (IOException ex) {
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331 ioFailed = true;
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332 } catch (HgException ex) {
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333 ioFailed = true;
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334 }
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335 return !ioFailed && areTheSame(f, bac.toArray(), dataFile.getPath());
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336 }
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337
117
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338 private boolean areTheSame(File f, final byte[] data, Path p) {
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339 FileInputStream fis = null;
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340 try {
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341 try {
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342 fis = new FileInputStream(f);
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343 FileChannel fc = fis.getChannel();
226
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344 ByteBuffer fb = ByteBuffer.allocate(min(1 + data.length * 2 /*to fit couple of lines appended; never zero*/, 8192));
219
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345 class Check implements ByteChannel {
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346 final boolean debug = false; // XXX may want to add global variable to allow clients to turn
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347 boolean sameSoFar = true;
117
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348 int x = 0;
219
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349
148
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350 public int write(ByteBuffer buffer) {
117
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351 for (int i = buffer.remaining(); i > 0; i--, x++) {
219
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352 if (x >= data.length /*file has been appended*/ || data[x] != buffer.get()) {
120
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353 if (debug) {
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354 byte[] xx = new byte[15];
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355 if (buffer.position() > 5) {
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356 buffer.position(buffer.position() - 5);
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357 }
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358 buffer.get(xx);
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359 System.out.print("expected >>" + new String(data, max(0, x - 4), 20) + "<< but got >>");
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360 System.out.println(new String(xx) + "<<");
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361 }
219
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362 sameSoFar = false;
117
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363 break;
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364 }
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365 }
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366 buffer.position(buffer.limit()); // mark as read
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367 return buffer.limit();
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368 }
219
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369
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370 public boolean sameSoFar() {
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371 return sameSoFar;
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372 }
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373 public boolean ultimatelyTheSame() {
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374 return sameSoFar && x == data.length;
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375 }
117
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376 };
219
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377 Check check = new Check();
117
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378 FilterByteChannel filters = new FilterByteChannel(check, repo.getFiltersFromWorkingDirToRepo(p));
219
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379 while (fc.read(fb) != -1 && check.sameSoFar()) {
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380 fb.flip();
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381 filters.write(fb);
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382 fb.compact();
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383 }
219
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384 return check.ultimatelyTheSame();
117
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385 } catch (IOException ex) {
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386 if (fis != null) {
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387 fis.close();
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388 }
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389 ex.printStackTrace(); // log warn
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390 }
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391 } catch (/*TODO typed*/Exception ex) {
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392 ex.printStackTrace();
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393 }
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394 return false;
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395 }
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396
141
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397 private static String todoGenerateFlags(Path fname) {
58
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398 // FIXME implement
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399 return null;
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400 }
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401
226
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402 @Experimental(reason="There's intention to support status query with multiple files/dirs, API might get changed")
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403 public static HgWorkingCopyStatusCollector create(HgRepository hgRepo, Path file) {
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404 FileIterator fi = file.isDirectory() ? new DirFileIterator(hgRepo, file) : new FileListIterator(hgRepo.getRepositoryRoot().getParentFile(), file);
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405 return new HgWorkingCopyStatusCollector(hgRepo, fi);
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406 }
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407
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408 private static class FileListIterator implements FileIterator {
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409 private final File dir;
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410 private final Path[] paths;
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411 private int index;
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412 private File nextFile; // cache file() in case it's called more than once
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413
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414 public FileListIterator(File startDir, Path... files) {
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415 dir = startDir;
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416 paths = files;
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417 reset();
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418 }
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419
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420 public void reset() {
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421 index = -1;
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422 nextFile = null;
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423 }
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424
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425 public boolean hasNext() {
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426 return paths.length > 0 && index < paths.length-1;
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427 }
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428
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429 public void next() {
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430 index++;
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431 if (index == paths.length) {
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432 throw new NoSuchElementException();
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433 }
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434 nextFile = new File(dir, paths[index].toString());
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435 }
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436
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437 public Path name() {
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438 return paths[index];
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439 }
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440
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441 public File file() {
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442 return nextFile;
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443 }
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444
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445 public boolean inScope(Path file) {
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446 for (int i = 0; i < paths.length; i++) {
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447 if (paths[i].equals(file)) {
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448 return true;
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449 }
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450 }
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451 return false;
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452 }
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453 }
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454
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455 private static class DirFileIterator implements FileIterator {
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456 private final Path dirOfInterest;
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457 private final FileWalker walker;
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458
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459 public DirFileIterator(HgRepository hgRepo, Path directory) {
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460 dirOfInterest = directory;
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461 File dir = hgRepo.getRepositoryRoot().getParentFile();
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462 Path.Source pathSrc = new Path.SimpleSource(new PathRewrite.Composite(new RelativePathRewrite(dir), hgRepo.getToRepoPathHelper()));
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463 walker = new FileWalker(new File(dir, directory.toString()), pathSrc);
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464 }
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465
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466 public void reset() {
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467 walker.reset();
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468 }
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469
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470 public boolean hasNext() {
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471 return walker.hasNext();
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472 }
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473
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474 public void next() {
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475 walker.next();
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476 }
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477
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478 public Path name() {
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479 return walker.name();
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480 }
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481
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482 public File file() {
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483 return walker.file();
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484 }
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485
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486 public boolean inScope(Path file) {
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487 return file.toString().startsWith(dirOfInterest.toString());
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488 }
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489 }
58
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490 }