Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgManifestCommand.java @ 233:1d389c0cb0a5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Optimize file history walk not to iterat over whole changelog for sparse and distant revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 Jun 2011 04:50:09 +0200
parents 1792b37650f2
children 4c3b9f679412
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.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
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126 void file(HgLogCommand.FileRevision 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 }