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annotate src/org/tmatesoft/hg/core/HgManifestCommand.java @ 444:b3b1db9301a2

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Few comments that emerged while working on examples
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 May 2012 20:19:22 +0200
parents 12f668401613
children d78cb5ca3053
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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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27
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28 import org.tmatesoft.hg.internal.PathPool;
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29 import org.tmatesoft.hg.repo.HgManifest;
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30 import org.tmatesoft.hg.repo.HgRepository;
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31 import org.tmatesoft.hg.repo.HgManifest.Flags;
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32 import org.tmatesoft.hg.repo.HgRuntimeException;
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33 import org.tmatesoft.hg.util.CancelSupport;
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34 import org.tmatesoft.hg.util.CancelledException;
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35 import org.tmatesoft.hg.util.Path;
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36 import org.tmatesoft.hg.util.PathRewrite;
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39 /**
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40 * Gives access to list of files in each revision (Mercurial manifest information), 'hg manifest' counterpart.
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41 *
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42 * @author Artem Tikhomirov
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43 * @author TMate Software Ltd.
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44 */
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45 public class HgManifestCommand extends HgAbstractCommand<HgManifestCommand> {
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47 private final HgRepository repo;
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48 private Path.Matcher matcher;
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49 private int startRev = 0, endRev = TIP;
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50 private HgManifestHandler visitor;
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51 private boolean needDirs = false;
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53 private final Mediator mediator = new Mediator();
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54
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55 public HgManifestCommand(HgRepository hgRepo) {
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56 repo = hgRepo;
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57 }
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59 /**
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60 * Parameterize command to visit revisions <code>[rev1..rev2]</code>.
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61 * @param rev1 - revision local index to start from. Non-negative. May be {@link HgRepository#TIP} (rev2 argument shall be {@link HgRepository#TIP} as well, then)
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62 * @param rev2 - revision local index to end with, inclusive. Non-negative, greater or equal to rev1. May be {@link HgRepository#TIP}.
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63 * @return <code>this</code> for convenience.
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64 * @throws IllegalArgumentException if revision arguments are incorrect (see above).
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65 */
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66 public HgManifestCommand range(int rev1, int rev2) {
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67 // XXX if manifest range is different from that of changelog, need conversion utils (external?)
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68 boolean badArgs = rev1 == BAD_REVISION || rev2 == BAD_REVISION || rev1 == WORKING_COPY || rev2 == WORKING_COPY;
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69 badArgs |= rev2 != TIP && rev2 < rev1; // range(3, 1);
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70 badArgs |= rev1 == TIP && rev2 != TIP; // range(TIP, 2), although this may be legitimate when TIP points to 2
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71 if (badArgs) {
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72 throw new IllegalArgumentException(String.format("Bad range: [%d, %d]", rev1, rev2));
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73 }
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74 startRev = rev1;
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75 endRev = rev2;
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76 return this;
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77 }
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79 public HgManifestCommand revision(int rev) {
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80 startRev = endRev = rev;
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81 return this;
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82 }
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84 // FIXME add changeset(Nodeid), perhaps rename revision(int) to changeset(int), and add changeset(int) to HgLogCommand (and, perhaps, others)
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86 public HgManifestCommand dirs(boolean include) {
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87 // XXX whether directories with directories only are include or not
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88 // now lists only directories with files
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89 needDirs = include;
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90 return this;
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91 }
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93 /**
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94 * Limit manifest walk to a subset of files.
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95 * @param pathMatcher - filter, pass <code>null</code> to clear.
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96 * @return <code>this</code> instance for convenience
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97 */
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98 public HgManifestCommand match(Path.Matcher pathMatcher) {
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99 matcher = pathMatcher;
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100 return this;
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101 }
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103 /**
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104 * With all parameters set, execute the command.
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105 *
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106 * @param handler - callback to get the outcome
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107 * @throws HgCallbackTargetException propagated exception from the handler
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108 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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109 * @throws CancelledException if execution of the command was cancelled
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110 * @throws IllegalArgumentException if handler is <code>null</code>
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111 * @throws ConcurrentModificationException if this command is already in use (running)
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112 */
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113 public void execute(HgManifestHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
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114 if (handler == null) {
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115 throw new IllegalArgumentException();
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116 }
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117 if (visitor != null) {
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118 throw new ConcurrentModificationException();
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119 }
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120 try {
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121 visitor = handler;
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122 mediator.start(getCancelSupport(handler, true));
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123 repo.getManifest().walk(startRev, endRev, mediator);
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124 mediator.checkFailure();
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125 } catch (HgRuntimeException ex) {
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126 throw new HgLibraryFailureException(ex);
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127 } finally {
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128 mediator.done();
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129 visitor = null;
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130 }
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131 }
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132
132
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133 // I'd rather let HgManifestCommand implement HgManifest.Inspector directly, but this pollutes API alot
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134 private class Mediator implements HgManifest.Inspector {
142
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135 // file names are likely to repeat in each revision, hence caching of Paths.
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136 // However, once HgManifest.Inspector switches to Path objects, perhaps global Path pool
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137 // might be more effective?
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138 private PathPool pathPool;
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139 private List<HgFileRevision> manifestContent;
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140 private Nodeid manifestNodeid;
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141 private Exception failure;
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142 private CancelSupport cancelHelper;
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143
427
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144 public void start(CancelSupport cs) {
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145 assert cs != null;
142
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146 // Manifest keeps normalized paths
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147 pathPool = new PathPool(new PathRewrite.Empty());
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148 cancelHelper = cs;
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149 }
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150
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151 public void done() {
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152 manifestContent = null;
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153 pathPool = null;
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154 }
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155
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156 private void recordFailure(HgCallbackTargetException ex) {
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157 failure = ex;
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158 }
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159 private void recordCancel(CancelledException ex) {
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160 failure = ex;
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161 }
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162
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163 public void checkFailure() throws HgCallbackTargetException, CancelledException {
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164 // TODO post-1.0 perhaps, can combine this code (record/checkFailure) for reuse in more classes (e.g. in Revlog)
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165 if (failure instanceof HgCallbackTargetException) {
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166 HgCallbackTargetException ex = (HgCallbackTargetException) failure;
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167 failure = null;
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168 throw ex;
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169 }
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170 if (failure instanceof CancelledException) {
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171 CancelledException ex = (CancelledException) failure;
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172 failure = null;
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173 throw ex;
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174 }
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175 }
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176
222
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177 public boolean begin(int manifestRevision, Nodeid nid, int changelogRevision) {
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178 if (needDirs && manifestContent == null) {
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179 manifestContent = new LinkedList<HgFileRevision>();
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180 }
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181 try {
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182 visitor.begin(manifestNodeid = nid);
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183 cancelHelper.checkCancelled();
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184 return true;
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185 } catch (HgCallbackTargetException ex) {
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186 recordFailure(ex);
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187 return false;
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188 } catch (CancelledException ex) {
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189 recordCancel(ex);
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190 return false;
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191 }
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192 }
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193 public boolean end(int revision) {
427
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194 try {
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195 if (needDirs) {
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196 LinkedHashMap<Path, LinkedList<HgFileRevision>> breakDown = new LinkedHashMap<Path, LinkedList<HgFileRevision>>();
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197 for (HgFileRevision fr : manifestContent) {
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198 Path filePath = fr.getPath();
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199 Path dirPath = pathPool.parent(filePath);
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200 LinkedList<HgFileRevision> revs = breakDown.get(dirPath);
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201 if (revs == null) {
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202 revs = new LinkedList<HgFileRevision>();
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203 breakDown.put(dirPath, revs);
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204 }
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205 revs.addLast(fr);
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206 }
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207 for (Path dir : breakDown.keySet()) {
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208 visitor.dir(dir);
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209 cancelHelper.checkCancelled();
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210 for (HgFileRevision fr : breakDown.get(dir)) {
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211 visitor.file(fr);
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212 }
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213 }
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214 manifestContent.clear();
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215 }
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216 visitor.end(manifestNodeid);
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217 cancelHelper.checkCancelled();
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218 return true;
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219 } catch (HgCallbackTargetException ex) {
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220 recordFailure(ex);
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221 return false;
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222 } catch (CancelledException ex) {
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223 recordCancel(ex);
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224 return false;
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225 } finally {
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226 manifestNodeid = null;
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227 }
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228 }
285
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229
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230 public boolean next(Nodeid nid, Path fname, Flags flags) {
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231 if (matcher != null && !matcher.accept(fname)) {
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232 return true;
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233 }
427
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234 try {
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235 HgFileRevision fr = new HgFileRevision(repo, nid, flags, fname);
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236 if (needDirs) {
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237 manifestContent.add(fr);
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238 } else {
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239 visitor.file(fr);
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240 }
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241 return true;
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242 } catch (HgCallbackTargetException ex) {
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243 recordFailure(ex);
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244 return false;
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245 }
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246 }
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247 }
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248 }