annotate src/org/tmatesoft/hg/repo/HgWorkingCopyStatusCollector.java @ 258:e5776067b3b8

Reduce number of objects instantiated on revlog read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 22:08:15 +0200 (2011-08-16)
parents 3fbfce107f94
children 6d1804fe0ed7
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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23 import java.io.File;
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24 import java.io.FileInputStream;
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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.nio.channels.FileChannel;
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28 import java.util.ArrayList;
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29 import java.util.Collections;
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30 import java.util.NoSuchElementException;
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31 import java.util.Set;
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32 import java.util.TreeSet;
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33
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34 import org.tmatesoft.hg.core.HgDataStreamException;
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35 import org.tmatesoft.hg.core.HgException;
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36 import org.tmatesoft.hg.core.Nodeid;
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37 import org.tmatesoft.hg.internal.ByteArrayChannel;
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38 import org.tmatesoft.hg.internal.Experimental;
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39 import org.tmatesoft.hg.internal.FilterByteChannel;
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40 import org.tmatesoft.hg.internal.ManifestRevision;
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41 import org.tmatesoft.hg.internal.PathScope;
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42 import org.tmatesoft.hg.util.ByteChannel;
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43 import org.tmatesoft.hg.util.CancelledException;
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44 import org.tmatesoft.hg.util.FileIterator;
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45 import org.tmatesoft.hg.util.FileWalker;
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46 import org.tmatesoft.hg.util.Path;
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47 import org.tmatesoft.hg.util.PathPool;
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48 import org.tmatesoft.hg.util.PathRewrite;
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50 /**
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51 *
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52 * @author Artem Tikhomirov
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53 * @author TMate Software Ltd.
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54 */
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55 public class HgWorkingCopyStatusCollector {
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57 private final HgRepository repo;
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58 private final FileIterator repoWalker;
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59 private HgDirstate dirstate;
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60 private HgStatusCollector baseRevisionCollector;
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61 private PathPool pathPool;
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63 public HgWorkingCopyStatusCollector(HgRepository hgRepo) {
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64 this(hgRepo, new HgInternals(hgRepo).createWorkingDirWalker(null));
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65 }
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67 // FIXME document cons
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68 public 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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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 ManifestRevision collect = null;
226
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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 {
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124 collect = new ManifestRevision(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 if (!f.exists()) {
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140 // file coming from iterator doesn't exist.
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141 if (knownEntries.remove(fname.toString())) {
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142 if (getDirstate().checkRemoved(fname) == null) {
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143 inspector.missing(fname);
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144 } else {
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145 inspector.removed(fname);
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146 }
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147 // do not report it as removed later
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148 if (collect != null) {
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149 baseRevFiles.remove(fname.toString());
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150 }
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151 } else {
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152 // chances are it was known in baseRevision. We may rely
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153 // that later iteration over baseRevFiles leftovers would yield correct Removed,
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154 // but it doesn't hurt to be explicit (provided we know fname *is* inScope of the FileIterator
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155 if (collect != null && baseRevFiles.remove(fname.toString())) {
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156 inspector.removed(fname);
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157 } else {
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158 // not sure I shall report such files (i.e. arbitrary name coming from FileIterator)
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159 // as unknown. Command-line HG aborts "system can't find the file specified"
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160 // in similar case (against wc), or just gives nothing if --change <rev> is specified.
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161 // however, as it's unlikely to get unexisting files from FileIterator, and
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162 // its better to see erroneous file status rather than not to see any (which is too easy
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163 // to overlook), I think unknown() is reasonable approach here
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164 inspector.unknown(fname);
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165 }
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166 }
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167 continue;
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168 }
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169 assert f.isFile();
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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) {
226
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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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diff changeset
225 private void checkLocalStatusAgainstFile(Path fname, File f, HgStatusInspector inspector) {
58
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226 HgDirstate.Record r;
59
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227 if ((r = getDirstate().checkNormal(fname)) != null) {
58
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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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d55d4eedfc57 Switch to Path instead of String in filenames returned by various status operations
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230 inspector.clean(getPathPool().path(fname));
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231 } else {
120
b19f0ac5ee62 Check against working copy shall expect non-persistent modifications done by filters and not report such files as modified
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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)) {
120
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235 inspector.modified(df.getPath());
180
42fe9a94b9d0 Report files as clean when no difference but timestamp found
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diff changeset
236 } else {
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diff changeset
237 inspector.clean(df.getPath());
120
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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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diff changeset
241 if (r.name2 == null) {
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diff changeset
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
248
3fbfce107f94 Issue 8: Means to find out information about given file at specific changeset. Inner ManifestRevisionInspector got promoted to ManifestRevision
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254 private void checkLocalStatusAgainstBaseRevision(Set<String> baseRevNames, ManifestRevision collect, int baseRevision, Path fname, File f, HgStatusInspector inspector) {
58
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255 // fname is in the dirstate, either Normal, Added, Removed or Merged
141
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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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diff changeset
260 // normal: added?
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261 // added: not known at the time of baseRevision, shall report
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diff changeset
262 // merged: was not known, report as added?
90
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diff changeset
263 if ((r = getDirstate().checkNormal(fname)) != null) {
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diff changeset
264 try {
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265 Path origin = HgStatusCollector.getOriginIfCopy(repo, fname, baseRevNames, baseRevision);
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diff changeset
266 if (origin != null) {
226
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diff changeset
267 inspector.copied(getPathPool().path(origin), fname);
157
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diff changeset
268 return;
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diff changeset
269 }
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diff changeset
270 } catch (HgDataStreamException ex) {
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
271 ex.printStackTrace();
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272 // FIXME report to a mediator, continue status collection
90
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diff changeset
273 }
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diff changeset
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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diff changeset
276 baseRevNames.remove(r.name2); // XXX surely I shall not report rename source as Removed?
226
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diff changeset
277 inspector.copied(getPathPool().path(r.name2), fname);
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diff changeset
278 return;
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279 }
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diff changeset
280 // fall-through, report as added
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281 } else if (getDirstate().checkRemoved(fname) != null) {
58
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diff changeset
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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diff changeset
285 inspector.added(fname);
58
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286 } else {
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diff changeset
287 // was known; check whether clean or modified
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diff changeset
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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diff changeset
289 if ((r = getDirstate().checkNormal(fname)) != null || (r = getDirstate().checkMerged(fname)) != null || (r = getDirstate().checkAdded(fname)) != null) {
58
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diff changeset
290 // either clean or modified
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diff changeset
291 HgDataFile fileNode = repo.getFileNode(fname);
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diff changeset
292 final int lengthAtRevision = fileNode.length(nid1);
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diff changeset
293 if (r.size /* XXX File.length() ?! */ != lengthAtRevision || flags != todoGenerateFlags(fname /*java.io.File*/)) {
226
26ad7827a62d Support status query for a single file or a subdirectory of a repository
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diff changeset
294 inspector.modified(fname);
58
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295 } else {
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parents:
diff changeset
296 // check actual content to see actual changes
157
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
297 if (areTheSame(f, fileNode, fileNode.getLocalRevision(nid1))) {
226
26ad7827a62d Support status query for a single file or a subdirectory of a repository
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diff changeset
298 inspector.clean(fname);
58
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diff changeset
299 } else {
226
26ad7827a62d Support status query for a single file or a subdirectory of a repository
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diff changeset
300 inspector.modified(fname);
58
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diff changeset
301 }
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diff changeset
302 }
226
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diff changeset
303 baseRevNames.remove(fname.toString()); // consumed, processed, handled.
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diff changeset
304 } else if (getDirstate().checkRemoved(fname) != null) {
26ad7827a62d Support status query for a single file or a subdirectory of a repository
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diff changeset
305 // was known, and now marked as removed, report it right away, do not rely on baseRevNames processing later
26ad7827a62d Support status query for a single file or a subdirectory of a repository
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diff changeset
306 inspector.removed(fname);
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diff changeset
307 baseRevNames.remove(fname.toString()); // consumed, processed, handled.
58
4cfc47bc14cc Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
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diff changeset
308 }
226
26ad7827a62d Support status query for a single file or a subdirectory of a repository
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diff changeset
309 // only those left in baseRevNames after processing are reported as removed
58
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310 }
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parents:
diff changeset
311
4cfc47bc14cc Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
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diff changeset
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
4cfc47bc14cc Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
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diff changeset
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
4cfc47bc14cc Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
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parents:
diff changeset
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:
4cfc47bc14cc Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
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parents:
diff changeset
315 // changeset nodeid + hash(actual content) => entry (Nodeid) in the next Manifest
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parents:
diff changeset
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).
4cfc47bc14cc Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
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diff changeset
317 // The question is whether original Hg treats this case (same content, different parents and hence nodeids) as 'modified' or 'clean'
4cfc47bc14cc Status against local working dir extracted into distinct class. Iterating over local files extracted for ease of os-dependant patching
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diff changeset
318 }
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diff changeset
319
157
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diff changeset
320 private boolean areTheSame(File f, HgDataFile dataFile, int localRevision) {
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
321 // XXX consider adding HgDataDile.compare(File/byte[]/whatever) operation to optimize comparison
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
322 ByteArrayChannel bac = new ByteArrayChannel();
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
323 boolean ioFailed = false;
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
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 (HgException ex) {
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331 ioFailed = true;
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332 }
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333 return !ioFailed && areTheSame(f, bac.toArray(), dataFile.getPath());
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334 }
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335
117
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336 private boolean areTheSame(File f, final byte[] data, Path p) {
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337 FileInputStream fis = null;
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338 try {
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339 try {
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340 fis = new FileInputStream(f);
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341 FileChannel fc = fis.getChannel();
226
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342 ByteBuffer fb = ByteBuffer.allocate(min(1 + data.length * 2 /*to fit couple of lines appended; never zero*/, 8192));
219
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343 class Check implements ByteChannel {
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344 final boolean debug = false; // XXX may want to add global variable to allow clients to turn
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345 boolean sameSoFar = true;
117
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346 int x = 0;
219
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347
148
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348 public int write(ByteBuffer buffer) {
117
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349 for (int i = buffer.remaining(); i > 0; i--, x++) {
219
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350 if (x >= data.length /*file has been appended*/ || data[x] != buffer.get()) {
120
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351 if (debug) {
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352 byte[] xx = new byte[15];
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353 if (buffer.position() > 5) {
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354 buffer.position(buffer.position() - 5);
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355 }
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356 buffer.get(xx);
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357 System.out.print("expected >>" + new String(data, max(0, x - 4), 20) + "<< but got >>");
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358 System.out.println(new String(xx) + "<<");
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359 }
219
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360 sameSoFar = false;
117
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361 break;
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362 }
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363 }
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364 buffer.position(buffer.limit()); // mark as read
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365 return buffer.limit();
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366 }
219
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367
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368 public boolean sameSoFar() {
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369 return sameSoFar;
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370 }
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371 public boolean ultimatelyTheSame() {
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372 return sameSoFar && x == data.length;
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373 }
117
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374 };
219
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375 Check check = new Check();
117
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376 FilterByteChannel filters = new FilterByteChannel(check, repo.getFiltersFromWorkingDirToRepo(p));
219
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377 while (fc.read(fb) != -1 && check.sameSoFar()) {
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378 fb.flip();
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379 filters.write(fb);
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380 fb.compact();
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381 }
246
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382 fis.close();
219
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383 return check.ultimatelyTheSame();
117
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384 } catch (IOException ex) {
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385 if (fis != null) {
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386 fis.close();
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387 }
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388 ex.printStackTrace(); // log warn
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389 }
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390 } catch (/*TODO typed*/Exception ex) {
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391 ex.printStackTrace();
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392 }
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393 return false;
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394 }
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395
141
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396 private static String todoGenerateFlags(Path fname) {
58
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397 // FIXME implement
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398 return null;
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399 }
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400
229
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401 /**
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402 * Configure status collector to consider only subset of a working copy tree. Tries to be as effective as possible, and to
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403 * traverse only relevant part of working copy on the filesystem.
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404 *
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405 * @param hgRepo repository
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406 * @param paths repository-relative files and/or directories. Directories are processed recursively.
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407 *
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408 * @return new instance of {@link HgWorkingCopyStatusCollector}, ready to {@link #walk(int, HgStatusInspector) walk} associated working copy
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409 */
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410 @Experimental(reason="Provisional API")
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411 public static HgWorkingCopyStatusCollector create(HgRepository hgRepo, Path... paths) {
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412 ArrayList<Path> f = new ArrayList<Path>(5);
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413 ArrayList<Path> d = new ArrayList<Path>(5);
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414 for (Path p : paths) {
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415 if (p.isDirectory()) {
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416 d.add(p);
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417 } else {
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418 f.add(p);
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419 }
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420 }
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421 // final Path[] dirs = f.toArray(new Path[d.size()]);
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422 if (d.isEmpty()) {
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diff changeset
423 final Path[] files = f.toArray(new Path[f.size()]);
237
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424 FileIterator fi = new FileListIterator(hgRepo.getWorkingDir(), files);
229
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425 return new HgWorkingCopyStatusCollector(hgRepo, fi);
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diff changeset
426 }
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427 //
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428
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diff changeset
429 //FileIterator fi = file.isDirectory() ? new DirFileIterator(hgRepo, file) : new FileListIterator(, file);
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diff changeset
430 FileIterator fi = new HgInternals(hgRepo).createWorkingDirWalker(new PathScope(true, paths));
226
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431 return new HgWorkingCopyStatusCollector(hgRepo, fi);
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diff changeset
432 }
229
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433
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434 /**
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435 * Configure collector object to calculate status for matching files only.
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436 * This method may be less effective than explicit list of files as it iterates over whole repository
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437 * (thus supplied matcher doesn't need to care if directories to files in question are also in scope,
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diff changeset
438 * see {@link FileWalker#FileWalker(File, Path.Source, Path.Matcher)})
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439 *
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440 * @return new instance of {@link HgWorkingCopyStatusCollector}, ready to {@link #walk(int, HgStatusInspector) walk} associated working copy
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441 */
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442 @Experimental(reason="Provisional API. May add boolean strict argument for those who write smart matchers that can be used in FileWalker")
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443 public static HgWorkingCopyStatusCollector create(HgRepository hgRepo, Path.Matcher scope) {
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444 FileIterator w = new HgInternals(hgRepo).createWorkingDirWalker(null);
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445 FileIterator wf = (scope == null || scope instanceof Path.Matcher.Any) ? w : new FileIteratorFilter(w, scope);
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446 // the reason I need to iterate over full repo and apply filter is that I have no idea whatsoever about
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447 // patterns in the scope. I.e. if scope lists a file (PathGlobMatcher("a/b/c.txt")), FileWalker won't get deep
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448 // to the file unless matcher would also explicitly include "a/", "a/b/" in scope. Since I can't rely
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449 // users would write robust matchers, and I don't see a decent way to enforce that (i.e. factory to produce
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450 // correct matcher from Path is much like what PathScope does, and can be accessed directly with #create(repo, Path...)
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451 // method above/
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452 return new HgWorkingCopyStatusCollector(hgRepo, wf);
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453 }
226
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454
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455 private static class FileListIterator implements FileIterator {
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456 private final File dir;
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457 private final Path[] paths;
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458 private int index;
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459 private File nextFile; // cache file() in case it's called more than once
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460
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461 public FileListIterator(File startDir, Path... files) {
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462 dir = startDir;
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463 paths = files;
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464 reset();
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465 }
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466
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467 public void reset() {
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468 index = -1;
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469 nextFile = null;
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470 }
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471
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472 public boolean hasNext() {
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473 return paths.length > 0 && index < paths.length-1;
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474 }
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475
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476 public void next() {
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477 index++;
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478 if (index == paths.length) {
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479 throw new NoSuchElementException();
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480 }
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481 nextFile = new File(dir, paths[index].toString());
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482 }
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483
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484 public Path name() {
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485 return paths[index];
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486 }
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487
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488 public File file() {
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489 return nextFile;
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490 }
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491
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492 public boolean inScope(Path file) {
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493 for (int i = 0; i < paths.length; i++) {
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494 if (paths[i].equals(file)) {
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495 return true;
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496 }
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497 }
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498 return false;
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499 }
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500 }
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501
229
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502 private static class FileIteratorFilter implements FileIterator {
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503 private final Path.Matcher filter;
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504 private final FileIterator walker;
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505 private boolean didNext = false;
226
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506
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507 public FileIteratorFilter(FileIterator fileWalker, Path.Matcher filterMatcher) {
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508 assert fileWalker != null;
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509 assert filterMatcher != null;
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510 filter = filterMatcher;
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511 walker = fileWalker;
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512 }
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513
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514 public void reset() {
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515 walker.reset();
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516 }
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517
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518 public boolean hasNext() {
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519 while (walker.hasNext()) {
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520 walker.next();
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521 if (filter.accept(walker.name())) {
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522 didNext = true;
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523 return true;
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524 }
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525 }
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526 return false;
226
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527 }
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528
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529 public void next() {
229
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530 if (didNext) {
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531 didNext = false;
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532 } else {
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533 if (!hasNext()) {
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534 throw new NoSuchElementException();
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535 }
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536 }
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537 }
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538
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539 public Path name() {
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540 return walker.name();
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541 }
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542
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543 public File file() {
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544 return walker.file();
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545 }
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546
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547 public boolean inScope(Path file) {
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548 return filter.accept(file);
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549 }
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550 }
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551 }