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annotate src/org/tmatesoft/hg/repo/HgWorkingCopyStatusCollector.java @ 251:8c951645bea0

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Some javadoc to explain HgFileInformer
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 12 Aug 2011 19:12:04 +0200
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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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)) {
120
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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
248
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254 private void checkLocalStatusAgainstBaseRevision(Set<String> baseRevNames, ManifestRevision 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);
157
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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
157
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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 (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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diff changeset
417 } else {
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418 f.add(p);
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diff changeset
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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diff changeset
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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diff changeset
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 }
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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;
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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 }