Mercurial > hg4j

annotate src/org/tmatesoft/hg/core/HgManifestCommand.java @ 505:3cd3c3d37432

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Use checked exception to indicate fs lock entanglements
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Nov 2012 22:08:11 +0100
parents 3ca4ae7bdd38
children 78a9e26e670d
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.HgInvalidRevisionException;
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30 import org.tmatesoft.hg.repo.HgManifest;
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31 import org.tmatesoft.hg.repo.HgRepository;
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32 import org.tmatesoft.hg.repo.HgManifest.Flags;
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33 import org.tmatesoft.hg.repo.HgRuntimeException;
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34 import org.tmatesoft.hg.util.CancelSupport;
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35 import org.tmatesoft.hg.util.CancelledException;
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36 import org.tmatesoft.hg.util.Path;
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37 import org.tmatesoft.hg.util.PathRewrite;
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40 /**
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41 * Gives access to list of files in each revision (Mercurial manifest information), 'hg manifest' counterpart.
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42 *
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43 * @author Artem Tikhomirov
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44 * @author TMate Software Ltd.
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45 */
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46 public class HgManifestCommand extends HgAbstractCommand<HgManifestCommand> {
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48 private final HgRepository repo;
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49 private Path.Matcher matcher;
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50 private int startRev = 0, endRev = TIP;
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51 private HgManifestHandler visitor;
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52 private boolean needDirs = false;
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54 private final Mediator mediator = new Mediator();
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56 public HgManifestCommand(HgRepository hgRepo) {
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57 repo = hgRepo;
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58 }
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59
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60 /**
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61 * Parameterize command to visit revisions <code>[rev1..rev2]</code>.
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62 * @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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63 * @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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64 * @return <code>this</code> for convenience.
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65 * @throws IllegalArgumentException if revision arguments are incorrect (see above).
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66 */
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67 public HgManifestCommand range(int rev1, int rev2) {
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68 // XXX if manifest range is different from that of changelog, need conversion utils (external?)
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69 boolean badArgs = rev1 == BAD_REVISION || rev2 == BAD_REVISION || rev1 == WORKING_COPY || rev2 == WORKING_COPY;
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70 badArgs |= rev2 != TIP && rev2 < rev1; // range(3, 1);
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71 badArgs |= rev1 == TIP && rev2 != TIP; // range(TIP, 2), although this may be legitimate when TIP points to 2
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72 if (badArgs) {
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73 throw new IllegalArgumentException(String.format("Bad range: [%d, %d]", rev1, rev2));
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74 }
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75 startRev = rev1;
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76 endRev = rev2;
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77 return this;
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78 }
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80 /**
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81 * Select changeset for the command using revision index
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82 * @param csetRevisionIndex index of changeset revision
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83 * @return <code>this</code> for convenience.
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84 */
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85 public HgManifestCommand changeset(int csetRevisionIndex) {
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86 return range(csetRevisionIndex, csetRevisionIndex);
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87 }
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88
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89 /**
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90 * Select changeset for the command
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91 *
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92 * @param nid changeset revision
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93 * @return <code>this</code> for convenience
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94 * @throws HgBadArgumentException if failed to find supplied changeset revision
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95 */
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96 public HgManifestCommand changeset(Nodeid nid) throws HgBadArgumentException {
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97 // XXX also see HgLogCommand#changeset(Nodeid)
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98 try {
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99 final int csetRevIndex = repo.getChangelog().getRevisionIndex(nid);
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100 return range(csetRevIndex, csetRevIndex);
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101 } catch (HgInvalidRevisionException ex) {
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102 throw new HgBadArgumentException("Can't find revision", ex).setRevision(nid);
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103 }
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104 }
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106 public HgManifestCommand dirs(boolean include) {
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107 // XXX whether directories with directories only are include or not
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108 // now lists only directories with files
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109 needDirs = include;
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110 return this;
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111 }
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113 /**
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114 * Limit manifest walk to a subset of files.
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115 * @param pathMatcher - filter, pass <code>null</code> to clear.
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116 * @return <code>this</code> instance for convenience
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117 */
131
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118 public HgManifestCommand match(Path.Matcher pathMatcher) {
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119 matcher = pathMatcher;
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120 return this;
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121 }
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122
148
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123 /**
427
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124 * With all parameters set, execute the command.
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125 *
148
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126 * @param handler - callback to get the outcome
427
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127 * @throws HgCallbackTargetException propagated exception from the handler
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128 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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129 * @throws CancelledException if execution of the command was cancelled
148
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130 * @throws IllegalArgumentException if handler is <code>null</code>
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131 * @throws ConcurrentModificationException if this command is already in use (running)
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132 */
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133 public void execute(HgManifestHandler handler) throws HgCallbackTargetException, HgException, CancelledException {
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134 if (handler == null) {
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135 throw new IllegalArgumentException();
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136 }
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137 if (visitor != null) {
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138 throw new ConcurrentModificationException();
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139 }
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140 try {
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141 visitor = handler;
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142 mediator.start(getCancelSupport(handler, true));
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143 repo.getManifest().walk(startRev, endRev, mediator);
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144 mediator.checkFailure();
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145 } catch (HgRuntimeException ex) {
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146 throw new HgLibraryFailureException(ex);
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147 } finally {
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bf304cb14247 Just in case mediator does anything to visitor on done()
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148 mediator.done();
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149 visitor = null;
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150 }
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151 }
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152
132
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153 // I'd rather let HgManifestCommand implement HgManifest.Inspector directly, but this pollutes API alot
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154 private class Mediator implements HgManifest.Inspector {
142
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155 // file names are likely to repeat in each revision, hence caching of Paths.
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156 // However, once HgManifest.Inspector switches to Path objects, perhaps global Path pool
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157 // might be more effective?
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158 private PathPool pathPool;
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159 private List<HgFileRevision> manifestContent;
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160 private Nodeid manifestNodeid;
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161 private Exception failure;
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162 private CancelSupport cancelHelper;
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163
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164 public void start(CancelSupport cs) {
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165 assert cs != null;
142
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166 // Manifest keeps normalized paths
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167 pathPool = new PathPool(new PathRewrite.Empty());
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168 cancelHelper = cs;
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169 }
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170
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171 public void done() {
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172 manifestContent = null;
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173 pathPool = null;
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174 }
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175
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176 private void recordFailure(HgCallbackTargetException ex) {
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177 failure = ex;
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178 }
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179 private void recordCancel(CancelledException ex) {
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180 failure = ex;
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181 }
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182
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183 public void checkFailure() throws HgCallbackTargetException, CancelledException {
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184 // TODO post-1.0 perhaps, can combine this code (record/checkFailure) for reuse in more classes (e.g. in Revlog)
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185 if (failure instanceof HgCallbackTargetException) {
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186 HgCallbackTargetException ex = (HgCallbackTargetException) failure;
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187 failure = null;
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188 throw ex;
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189 }
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190 if (failure instanceof CancelledException) {
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191 CancelledException ex = (CancelledException) failure;
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192 failure = null;
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193 throw ex;
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194 }
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195 }
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196
222
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197 public boolean begin(int manifestRevision, Nodeid nid, int changelogRevision) {
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198 if (needDirs && manifestContent == null) {
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199 manifestContent = new LinkedList<HgFileRevision>();
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200 }
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201 try {
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202 visitor.begin(manifestNodeid = nid);
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203 cancelHelper.checkCancelled();
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204 return true;
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205 } catch (HgCallbackTargetException ex) {
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206 recordFailure(ex);
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207 return false;
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208 } catch (CancelledException ex) {
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209 recordCancel(ex);
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210 return false;
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211 }
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212 }
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213 public boolean end(int revision) {
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214 try {
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215 if (needDirs) {
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216 LinkedHashMap<Path, LinkedList<HgFileRevision>> breakDown = new LinkedHashMap<Path, LinkedList<HgFileRevision>>();
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217 for (HgFileRevision fr : manifestContent) {
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218 Path filePath = fr.getPath();
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219 Path dirPath = pathPool.parent(filePath);
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220 LinkedList<HgFileRevision> revs = breakDown.get(dirPath);
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221 if (revs == null) {
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222 revs = new LinkedList<HgFileRevision>();
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223 breakDown.put(dirPath, revs);
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224 }
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225 revs.addLast(fr);
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226 }
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227 for (Path dir : breakDown.keySet()) {
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228 visitor.dir(dir);
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229 cancelHelper.checkCancelled();
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230 for (HgFileRevision fr : breakDown.get(dir)) {
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231 visitor.file(fr);
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232 }
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233 }
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234 manifestContent.clear();
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235 }
427
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236 visitor.end(manifestNodeid);
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237 cancelHelper.checkCancelled();
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238 return true;
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239 } catch (HgCallbackTargetException ex) {
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240 recordFailure(ex);
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241 return false;
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242 } catch (CancelledException ex) {
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243 recordCancel(ex);
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244 return false;
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245 } finally {
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246 manifestNodeid = null;
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247 }
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248 }
285
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249
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250 public boolean next(Nodeid nid, Path fname, Flags flags) {
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251 if (matcher != null && !matcher.accept(fname)) {
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252 return true;
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253 }
427
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254 try {
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255 HgFileRevision fr = new HgFileRevision(repo, nid, flags, fname);
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256 if (needDirs) {
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257 manifestContent.add(fr);
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258 } else {
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259 visitor.file(fr);
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260 }
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261 return true;
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262 } catch (HgCallbackTargetException ex) {
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263 recordFailure(ex);
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264 return false;
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265 }
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266 }
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267 }
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268 }