Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgManifestCommand.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents 6dbbc53fc46d
children 189dc6dc1c3e
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.core;
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19 import static org.tmatesoft.hg.repo.HgRepository.*;
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20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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23 import java.util.ConcurrentModificationException;
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24 import java.util.LinkedHashMap;
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25 import java.util.LinkedList;
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26 import java.util.List;
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28 import org.tmatesoft.hg.repo.HgManifest;
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29 import org.tmatesoft.hg.repo.HgRepository;
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30 import org.tmatesoft.hg.repo.HgManifest.Flags;
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31 import org.tmatesoft.hg.util.Path;
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32 import org.tmatesoft.hg.util.PathPool;
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33 import org.tmatesoft.hg.util.PathRewrite;
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36 /**
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37 * Gives access to list of files in each revision (Mercurial manifest information), 'hg manifest' counterpart.
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class HgManifestCommand extends HgAbstractCommand<HgManifestCommand> {
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44 private final HgRepository repo;
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45 private Path.Matcher matcher;
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46 private int startRev = 0, endRev = TIP;
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47 private Handler visitor;
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48 private boolean needDirs = false;
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50 private final Mediator mediator = new Mediator();
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52 public HgManifestCommand(HgRepository hgRepo) {
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53 repo = hgRepo;
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54 }
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56 /**
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57 * Parameterize command to visit revisions <code>[rev1..rev2]</code>.
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58 * @param rev1 - local revision number to start from. Non-negative. May be {@link HgRepository#TIP} (rev2 argument shall be {@link HgRepository#TIP} as well, then)
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59 * @param rev2 - local revision number to end with, inclusive. Non-negative, greater or equal to rev1. May be {@link HgRepository#TIP}.
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60 * @return <code>this</code> for convenience.
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61 * @throws IllegalArgumentException if revision arguments are incorrect (see above).
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62 */
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63 public HgManifestCommand range(int rev1, int rev2) {
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64 // XXX if manifest range is different from that of changelog, need conversion utils (external?)
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65 boolean badArgs = rev1 == BAD_REVISION || rev2 == BAD_REVISION || rev1 == WORKING_COPY || rev2 == WORKING_COPY;
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66 badArgs |= rev2 != TIP && rev2 < rev1; // range(3, 1);
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67 badArgs |= rev1 == TIP && rev2 != TIP; // range(TIP, 2), although this may be legitimate when TIP points to 2
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68 if (badArgs) {
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69 throw new IllegalArgumentException(String.format("Bad range: [%d, %d]", rev1, rev2));
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70 }
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71 startRev = rev1;
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72 endRev = rev2;
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73 return this;
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74 }
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76 public HgManifestCommand revision(int rev) {
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77 startRev = endRev = rev;
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78 return this;
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79 }
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81 public HgManifestCommand dirs(boolean include) {
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82 // XXX whether directories with directories only are include or not
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83 // now lists only directories with files
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84 needDirs = include;
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85 return this;
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86 }
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88 /**
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89 * Limit manifest walk to a subset of files.
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90 * @param pathMatcher - filter, pass <code>null</code> to clear.
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91 * @return <code>this</code> instance for convenience
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92 */
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93 public HgManifestCommand match(Path.Matcher pathMatcher) {
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94 matcher = pathMatcher;
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95 return this;
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96 }
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98 /**
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99 * Runs the command.
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100 * @param handler - callback to get the outcome
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101 * @throws IllegalArgumentException if handler is <code>null</code>
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102 * @throws ConcurrentModificationException if this command is already in use (running)
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103 */
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104 public void execute(Handler handler) {
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105 if (handler == null) {
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106 throw new IllegalArgumentException();
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107 }
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108 if (visitor != null) {
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109 throw new ConcurrentModificationException();
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110 }
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111 try {
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112 visitor = handler;
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113 mediator.start();
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114 repo.getManifest().walk(startRev, endRev, mediator);
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115 } finally {
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bf304cb14247 Just in case mediator does anything to visitor on done()
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116 mediator.done();
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117 visitor = null;
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118 }
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119 }
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120
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121 /**
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122 * Callback to walk file/directory tree of a revision
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123 */
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124 public interface Handler {
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125 void begin(Nodeid manifestRevision);
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126 void dir(Path p); // optionally invoked (if walker was configured to spit out directories) prior to any files from this dir and subdirs
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127 void file(HgFileRevision fileRevision); // XXX allow to check p is invalid (df.exists())
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128 void end(Nodeid manifestRevision);
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129 }
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130
132
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131 // I'd rather let HgManifestCommand implement HgManifest.Inspector directly, but this pollutes API alot
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132 private class Mediator implements HgManifest.Inspector2 {
142
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133 // file names are likely to repeat in each revision, hence caching of Paths.
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134 // However, once HgManifest.Inspector switches to Path objects, perhaps global Path pool
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135 // might be more effective?
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136 private PathPool pathPool;
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137 private List<HgFileRevision> manifestContent;
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138 private Nodeid manifestNodeid;
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139
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140 public void start() {
142
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141 // Manifest keeps normalized paths
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142 pathPool = new PathPool(new PathRewrite.Empty());
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143 }
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144
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145 public void done() {
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146 manifestContent = null;
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147 pathPool = null;
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148 }
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149
222
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150 public boolean begin(int manifestRevision, Nodeid nid, int changelogRevision) {
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151 if (needDirs && manifestContent == null) {
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152 manifestContent = new LinkedList<HgFileRevision>();
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153 }
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154 visitor.begin(manifestNodeid = nid);
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155 return true;
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156 }
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157 public boolean end(int revision) {
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158 if (needDirs) {
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159 LinkedHashMap<Path, LinkedList<HgFileRevision>> breakDown = new LinkedHashMap<Path, LinkedList<HgFileRevision>>();
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160 for (HgFileRevision fr : manifestContent) {
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161 Path filePath = fr.getPath();
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162 Path dirPath = pathPool.parent(filePath);
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163 LinkedList<HgFileRevision> revs = breakDown.get(dirPath);
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164 if (revs == null) {
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165 revs = new LinkedList<HgFileRevision>();
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166 breakDown.put(dirPath, revs);
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167 }
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168 revs.addLast(fr);
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169 }
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170 for (Path dir : breakDown.keySet()) {
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171 visitor.dir(dir);
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172 for (HgFileRevision fr : breakDown.get(dir)) {
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173 visitor.file(fr);
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174 }
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175 }
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176 manifestContent.clear();
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177 }
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178 visitor.end(manifestNodeid);
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179 manifestNodeid = null;
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180 return true;
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181 }
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182 public boolean next(Nodeid nid, String fname, String flags) {
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183 throw new HgBadStateException(HgManifest.Inspector2.class.getName());
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184 }
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185
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186 public boolean next(Nodeid nid, Path fname, Flags flags) {
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187 if (matcher != null && !matcher.accept(fname)) {
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188 return true;
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189 }
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190 HgFileRevision fr = new HgFileRevision(repo, nid, fname);
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191 if (needDirs) {
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192 manifestContent.add(fr);
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193 } else {
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194 visitor.file(fr);
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195 }
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196 return true;
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197 }
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198 }
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199 }