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annotate src/org/tmatesoft/hg/core/HgManifestCommand.java @ 256:b61ed0f2c4da

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Yet another slight perf/mem improvement for the tags per file sample
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 16 Aug 2011 15:45:47 +0200
parents 4c3b9f679412
children 6dbbc53fc46d
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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18
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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.util.Path;
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31 import org.tmatesoft.hg.util.PathPool;
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32 import org.tmatesoft.hg.util.PathRewrite;
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35 /**
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36 * Gives access to list of files in each revision (Mercurial manifest information), 'hg manifest' counterpart.
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class HgManifestCommand extends HgAbstractCommand<HgManifestCommand> {
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43 private final HgRepository repo;
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44 private Path.Matcher matcher;
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45 private int startRev = 0, endRev = TIP;
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46 private Handler visitor;
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47 private boolean needDirs = false;
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49 private final Mediator mediator = new Mediator();
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50
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51 public HgManifestCommand(HgRepository hgRepo) {
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52 repo = hgRepo;
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53 }
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54
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55 /**
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56 * Parameterize command to visit revisions <code>[rev1..rev2]</code>.
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57 * @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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58 * @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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59 * @return <code>this</code> for convenience.
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60 * @throws IllegalArgumentException if revision arguments are incorrect (see above).
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61 */
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62 public HgManifestCommand range(int rev1, int rev2) {
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63 // XXX if manifest range is different from that of changelog, need conversion utils (external?)
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64 boolean badArgs = rev1 == BAD_REVISION || rev2 == BAD_REVISION || rev1 == WORKING_COPY || rev2 == WORKING_COPY;
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65 badArgs |= rev2 != TIP && rev2 < rev1; // range(3, 1);
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66 badArgs |= rev1 == TIP && rev2 != TIP; // range(TIP, 2), although this may be legitimate when TIP points to 2
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67 if (badArgs) {
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68 throw new IllegalArgumentException(String.format("Bad range: [%d, %d]", rev1, rev2));
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69 }
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70 startRev = rev1;
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71 endRev = rev2;
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72 return this;
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73 }
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75 public HgManifestCommand revision(int rev) {
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76 startRev = endRev = rev;
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77 return this;
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78 }
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80 public HgManifestCommand dirs(boolean include) {
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81 // XXX whether directories with directories only are include or not
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82 // now lists only directories with files
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83 needDirs = include;
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84 return this;
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85 }
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87 /**
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88 * Limit manifest walk to a subset of files.
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89 * @param pathMatcher - filter, pass <code>null</code> to clear.
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90 * @return <code>this</code> instance for convenience
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91 */
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92 public HgManifestCommand match(Path.Matcher pathMatcher) {
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93 matcher = pathMatcher;
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94 return this;
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95 }
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97 /**
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98 * Runs the command.
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99 * @param handler - callback to get the outcome
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100 * @throws IllegalArgumentException if handler is <code>null</code>
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101 * @throws ConcurrentModificationException if this command is already in use (running)
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102 */
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103 public void execute(Handler handler) {
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104 if (handler == null) {
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105 throw new IllegalArgumentException();
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106 }
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107 if (visitor != null) {
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108 throw new ConcurrentModificationException();
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109 }
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110 try {
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111 visitor = handler;
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112 mediator.start();
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113 repo.getManifest().walk(startRev, endRev, mediator);
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114 } finally {
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115 mediator.done();
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116 visitor = null;
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117 }
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118 }
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119
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120 /**
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121 * Callback to walk file/directory tree of a revision
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122 */
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123 public interface Handler {
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124 void begin(Nodeid manifestRevision);
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125 void dir(Path p); // optionally invoked (if walker was configured to spit out directories) prior to any files from this dir and subdirs
249
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126 void file(HgFileRevision fileRevision); // XXX allow to check p is invalid (df.exists())
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127 void end(Nodeid manifestRevision);
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128 }
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129
132
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130 // I'd rather let HgManifestCommand implement HgManifest.Inspector directly, but this pollutes API alot
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131 private class Mediator implements HgManifest.Inspector {
142
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132 // file names are likely to repeat in each revision, hence caching of Paths.
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133 // However, once HgManifest.Inspector switches to Path objects, perhaps global Path pool
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134 // might be more effective?
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135 private PathPool pathPool;
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136 private List<HgFileRevision> manifestContent;
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137 private Nodeid manifestNodeid;
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138
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139 public void start() {
142
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140 // Manifest keeps normalized paths
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141 pathPool = new PathPool(new PathRewrite.Empty());
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142 }
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143
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144 public void done() {
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145 manifestContent = null;
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146 pathPool = null;
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147 }
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148
222
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149 public boolean begin(int manifestRevision, Nodeid nid, int changelogRevision) {
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150 if (needDirs && manifestContent == null) {
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151 manifestContent = new LinkedList<HgFileRevision>();
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152 }
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153 visitor.begin(manifestNodeid = nid);
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154 return true;
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155 }
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156 public boolean end(int revision) {
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157 if (needDirs) {
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158 LinkedHashMap<Path, LinkedList<HgFileRevision>> breakDown = new LinkedHashMap<Path, LinkedList<HgFileRevision>>();
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159 for (HgFileRevision fr : manifestContent) {
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160 Path filePath = fr.getPath();
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161 Path dirPath = pathPool.parent(filePath);
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162 LinkedList<HgFileRevision> revs = breakDown.get(dirPath);
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163 if (revs == null) {
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164 revs = new LinkedList<HgFileRevision>();
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165 breakDown.put(dirPath, revs);
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166 }
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167 revs.addLast(fr);
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168 }
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169 for (Path dir : breakDown.keySet()) {
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170 visitor.dir(dir);
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171 for (HgFileRevision fr : breakDown.get(dir)) {
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172 visitor.file(fr);
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173 }
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174 }
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175 manifestContent.clear();
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176 }
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177 visitor.end(manifestNodeid);
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178 manifestNodeid = null;
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179 return true;
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180 }
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181 public boolean next(Nodeid nid, String fname, String flags) {
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182 Path p = pathPool.path(fname);
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183 if (matcher != null && !matcher.accept(p)) {
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184 return true;
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185 }
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186 HgFileRevision fr = new HgFileRevision(repo, nid, p);
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187 if (needDirs) {
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188 manifestContent.add(fr);
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189 } else {
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190 visitor.file(fr);
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191 }
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192 return true;
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193 }
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194 }
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195 }