Mercurial > hg4j
annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 694:7efabe0cddcf
Speed up (a) file rename history to minimize file reads; (b) file.isCopy(int) to read metadata for few revisions at once (use pattern assumes earlier revisions are likely to be queried, too); (c) HgIgnore.isIgnored by caching matched initial fragments (to substitute more expensive Matcher.matches with cheaper HashMap.contains)
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Mon, 05 Aug 2013 17:42:10 +0200 |
parents | b286222158be |
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rev | line source |
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107 | 1 /* |
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2 * Copyright (c) 2011-2013 TMate Software Ltd |
107 | 3 * |
4 * This program is free software; you can redistribute it and/or modify | |
5 * it under the terms of the GNU General Public License as published by | |
6 * the Free Software Foundation; version 2 of the License. | |
7 * | |
8 * This program is distributed in the hope that it will be useful, | |
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 * GNU General Public License for more details. | |
12 * | |
13 * For information on how to redistribute this software under | |
14 * the terms of a license other than GNU General Public License | |
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15 * contact TMate Software at support@hg4j.com |
107 | 16 */ |
17 package org.tmatesoft.hg.core; | |
18 | |
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19 import static org.tmatesoft.hg.repo.HgInternals.wrongRevisionIndex; |
107 | 20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION; |
21 import static org.tmatesoft.hg.repo.HgRepository.TIP; | |
22 | |
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23 import java.io.IOException; |
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24 import java.nio.ByteBuffer; |
107 | 25 |
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26 import org.tmatesoft.hg.internal.CsetParamKeeper; |
107 | 27 import org.tmatesoft.hg.repo.HgDataFile; |
28 import org.tmatesoft.hg.repo.HgRepository; | |
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29 import org.tmatesoft.hg.repo.HgRuntimeException; |
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30 import org.tmatesoft.hg.util.Adaptable; |
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31 import org.tmatesoft.hg.util.ByteChannel; |
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32 import org.tmatesoft.hg.util.CancelSupport; |
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33 import org.tmatesoft.hg.util.CancelledException; |
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34 import org.tmatesoft.hg.util.Outcome; |
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35 import org.tmatesoft.hg.util.Path; |
107 | 36 |
37 /** | |
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38 * Command to obtain content of a file, 'hg cat' counterpart. |
107 | 39 * |
40 * @author Artem Tikhomirov | |
41 * @author TMate Software Ltd. | |
42 */ | |
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43 public class HgCatCommand extends HgAbstractCommand<HgCatCommand> { |
107 | 44 |
45 private final HgRepository repo; | |
46 private Path file; | |
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47 private int revisionIndex = TIP; |
107 | 48 private Nodeid revision; |
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49 private Nodeid cset; |
107 | 50 |
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51 public HgCatCommand(HgRepository hgRepo) { |
107 | 52 repo = hgRepo; |
53 } | |
54 | |
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55 /** |
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56 * File to read, required parameter |
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57 * @param fname path to a repository file, can't be <code>null</code> |
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58 * @return <code>this</code> for convenience |
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59 * @throws IllegalArgumentException if supplied fname is null or points to directory |
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60 */ |
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61 public HgCatCommand file(Path fname) { |
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62 if (fname == null || fname.isDirectory()) { |
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63 throw new IllegalArgumentException(String.valueOf(fname)); |
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64 } |
107 | 65 file = fname; |
66 return this; | |
67 } | |
68 | |
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69 /** |
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70 * Select specific revision of the file to cat with revision local index. Note, revision numbering is of particular file, not that of |
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71 * repository (i.e. revision 0 means initial content of the file, irrespective of changeset revision at the time of commit) |
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72 * |
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73 * Invocation of this method clears revision set with {@link #revision(Nodeid)} or {@link #revision(int)} earlier. |
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74 * |
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75 * @param fileRevisionIndex - revision local index, non-negative, or one of predefined constants. Note, use of {@link HgRepository#BAD_REVISION}, |
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76 * although possible, makes little sense (command would fail if executed). |
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77 * @return <code>this</code> for convenience |
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78 */ |
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79 public HgCatCommand revision(int fileRevisionIndex) { // TODO [2.0 API break] shall throw HgBadArgumentException, like other commands do |
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80 if (wrongRevisionIndex(fileRevisionIndex)) { |
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81 throw new IllegalArgumentException(String.valueOf(fileRevisionIndex)); |
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82 } |
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83 revisionIndex = fileRevisionIndex; |
107 | 84 revision = null; |
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85 cset = null; |
107 | 86 return this; |
87 } | |
88 | |
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89 /** |
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90 * Select file revision to read. Note, this revision is file revision (i.e. the one from manifest), not the changeset revision. |
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91 * |
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92 * Invocation of this method clears revision set with {@link #revision(int)} or {@link #revision(Nodeid)} earlier. |
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93 * |
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94 * @param nodeid - unique file revision identifier, Note, use of <code>null</code> or {@link Nodeid#NULL} is senseless |
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95 * @return <code>this</code> for convenience |
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96 */ |
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97 public HgCatCommand revision(Nodeid nodeid) { |
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98 if (nodeid != null && nodeid.isNull()) { |
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99 nodeid = null; |
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100 } |
107 | 101 revision = nodeid; |
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102 revisionIndex = BAD_REVISION; |
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103 cset = null; |
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104 return this; |
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105 } |
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106 |
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107 /** |
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108 * Parameterize the command from file revision object. |
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109 * |
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110 * @param fileRev file revision to cat |
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111 * @return <code>this</code> for convenience |
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112 */ |
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113 public HgCatCommand revision(HgFileRevision fileRev) { |
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114 return file(fileRev.getPath()).revision(fileRev.getRevision()); |
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115 } |
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116 |
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117 /** |
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118 * Select whatever revision of the file that was actual at the time of the specified changeset. Unlike {@link #revision(int)} or {@link #revision(Nodeid)}, this method |
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119 * operates in terms of repository global revisions (aka changesets). |
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120 * |
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121 * Invocation of this method clears selection of a file revision with its index. |
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122 * |
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123 * @param nodeid changeset revision |
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124 * @return <code>this</code> for convenience |
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125 */ |
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126 public HgCatCommand changeset(Nodeid nodeid) { |
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127 revisionIndex = BAD_REVISION; |
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128 revision = null; |
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129 cset = nodeid; |
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130 // TODO [2.0 API break] shall use CsetParamKeeper instead, but Exception thrown would break the API |
107 | 131 return this; |
132 } | |
133 | |
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134 /** |
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135 * Select file by changeset |
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136 * @see #changeset(Nodeid) |
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137 * @param revisionIndex index of changelog revision |
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138 * @return <code>this</code> for convenience |
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139 * @throws HgBadArgumentException if failed to find supplied changeset revision |
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140 */ |
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141 public HgCatCommand changeset(int revisionIndex) throws HgBadArgumentException { |
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142 int ri = new CsetParamKeeper(repo).set(revisionIndex).get(); |
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143 return changeset(repo.getChangelog().getRevision(ri)); |
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144 } |
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145 |
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146 /** |
148
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147 * Runs the command with current set of parameters and pipes data to provided sink. |
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148 * |
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149 * @param sink output channel to write data to. |
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150 * |
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151 * @throws HgBadArgumentException if no target file node found |
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152 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state |
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153 * @throws CancelledException if execution of the command was cancelled |
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154 * @throws IllegalArgumentException when command arguments are incomplete or wrong |
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155 */ |
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156 public void execute(ByteChannel sink) throws HgException, CancelledException { |
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157 // XXX perhaps, IAE together with HgBadArgumentException is not the best idea |
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158 if (revisionIndex == BAD_REVISION && revision == null && cset == null) { |
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159 throw new IllegalArgumentException("File revision, corresponing local number, or a changset nodeid shall be specified"); |
107 | 160 } |
161 if (file == null) { | |
162 throw new IllegalArgumentException("Name of the file is missing"); | |
163 } | |
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164 if (sink == null) { |
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165 throw new IllegalArgumentException("Need an output channel"); |
107 | 166 } |
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167 try { |
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168 HgDataFile dataFile = repo.getFileNode(file); |
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169 if (!dataFile.exists()) { |
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170 // TODO may benefit from repo.getStoragePath to print revlog location in addition to human-friendly file path |
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171 throw new HgPathNotFoundException(String.format("File %s not found in the repository", file), file); |
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172 } |
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173 int revToExtract; |
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174 if (cset != null) { |
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175 // TODO HgChangesetFileSneaker is handy, but bit too much here, shall extract follow rename code into separate utility |
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176 HgChangesetFileSneaker fsneaker = new HgChangesetFileSneaker(repo); |
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177 fsneaker.changeset(cset).followRenames(true); |
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178 Outcome o = fsneaker.check(file); |
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179 if (!o.isOk()) { |
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180 if (o.getException() instanceof HgRuntimeException) { |
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181 throw new HgLibraryFailureException(o.getMessage(), (HgRuntimeException) o.getException()); |
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182 } |
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183 throw new HgBadArgumentException(o.getMessage(), o.getException()).setFileName(file).setRevision(cset); |
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184 } |
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185 if (!fsneaker.exists()) { |
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186 throw new HgPathNotFoundException(o.getMessage(), file).setRevision(cset); |
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187 } |
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188 Nodeid toExtract = fsneaker.revision(); |
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189 if (fsneaker.hasAnotherName()) { |
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190 dataFile = repo.getFileNode(fsneaker.filename()); |
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191 } |
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192 revToExtract = dataFile.getRevisionIndex(toExtract); |
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193 } else if (revision != null) { |
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194 revToExtract = dataFile.getRevisionIndex(revision); |
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195 } else { |
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196 revToExtract = revisionIndex; |
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197 } |
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198 ByteChannel sinkWrap; |
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199 if (getCancelSupport(null, false) == null) { |
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200 // no command-specific cancel helper, no need for extra proxy |
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201 // sink itself still may supply CS |
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202 sinkWrap = sink; |
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203 } else { |
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204 // try CS from sink, if any. at least there is CS from command |
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205 CancelSupport cancelHelper = getCancelSupport(sink, true); |
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206 cancelHelper.checkCancelled(); |
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207 sinkWrap = new ByteChannelProxy(sink, cancelHelper); |
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208 } |
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209 dataFile.contentWithFilters(revToExtract, sinkWrap); |
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210 } catch (HgRuntimeException ex) { |
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211 throw new HgLibraryFailureException(ex); |
107 | 212 } |
322
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213 } |
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214 |
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215 private static class ByteChannelProxy implements ByteChannel, Adaptable { |
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216 private final ByteChannel delegate; |
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217 private final CancelSupport cancelHelper; |
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218 |
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219 public ByteChannelProxy(ByteChannel _delegate, CancelSupport cs) { |
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220 assert _delegate != null; |
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221 delegate = _delegate; |
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222 cancelHelper = cs; |
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223 } |
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224 public int write(ByteBuffer buffer) throws IOException, CancelledException { |
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225 return delegate.write(buffer); |
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226 } |
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227 |
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228 public <T> T getAdapter(Class<T> adapterClass) { |
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229 if (CancelSupport.class == adapterClass) { |
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230 return adapterClass.cast(cancelHelper); |
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231 } |
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232 return Adaptable.Factory.getAdapter(delegate, adapterClass, null); |
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233 } |
107 | 234 } |
235 } |