Mercurial > jhg
annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 198:33a7d76f067b
Performance optimization: reduce memory to keep revlog cached info
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
|---|---|
| date | Wed, 20 Apr 2011 05:40:14 +0200 |
| parents | d5268ca7715b |
| children | 41a778e3fd31 |
| rev | line source |
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| 107 | 1 /* |
| 2 * Copyright (c) 2011 TMate Software Ltd | |
| 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.wrongLocalRevision; |
| 107 | 20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION; |
| 21 import static org.tmatesoft.hg.repo.HgRepository.TIP; | |
| 22 | |
| 23 import java.io.FileNotFoundException; | |
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24 import java.io.IOException; |
| 107 | 25 |
| 26 import org.tmatesoft.hg.repo.HgDataFile; | |
| 27 import org.tmatesoft.hg.repo.HgRepository; | |
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28 import org.tmatesoft.hg.util.ByteChannel; |
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29 import org.tmatesoft.hg.util.CancelledException; |
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30 import org.tmatesoft.hg.util.Path; |
| 107 | 31 |
| 32 /** | |
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33 * Command to obtain content of a file, 'hg cat' counterpart. |
| 107 | 34 * |
| 35 * @author Artem Tikhomirov | |
| 36 * @author TMate Software Ltd. | |
| 37 */ | |
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38 public class HgCatCommand { |
| 107 | 39 |
| 40 private final HgRepository repo; | |
| 41 private Path file; | |
| 42 private int localRevision = TIP; | |
| 43 private Nodeid revision; | |
| 44 | |
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45 public HgCatCommand(HgRepository hgRepo) { |
| 107 | 46 repo = hgRepo; |
| 47 } | |
| 48 | |
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49 /** |
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50 * File to read, required parameter |
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51 * @param fname path to a repository file, can't be <code>null</code> |
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52 * @return <code>this</code> for convenience |
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53 * @throws IllegalArgumentException if supplied fname is null or points to directory |
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54 */ |
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55 public HgCatCommand file(Path fname) { |
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56 if (fname == null || fname.isDirectory()) { |
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57 throw new IllegalArgumentException(String.valueOf(fname)); |
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58 } |
| 107 | 59 file = fname; |
| 60 return this; | |
| 61 } | |
| 62 | |
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63 /** |
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64 * Invocation of this method clears revision set with {@link #revision(Nodeid)} or {@link #revision(int)} earlier. |
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65 * XXX rev can't be WORKING_COPY (if allowed, need to implement in #execute()) |
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66 * @param rev local revision number, non-negative, or one of predefined constants. Note, use of {@link HgRepository#BAD_REVISION}, |
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67 * although possible, makes little sense (command would fail if executed). |
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68 * @return <code>this</code> for convenience |
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69 */ |
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70 public HgCatCommand revision(int rev) { |
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71 if (wrongLocalRevision(rev)) { |
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72 throw new IllegalArgumentException(String.valueOf(rev)); |
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73 } |
| 107 | 74 localRevision = rev; |
| 75 revision = null; | |
| 76 return this; | |
| 77 } | |
| 78 | |
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79 /** |
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80 * Select revision to read. Invocation of this method clears revision set with {@link #revision(int)} or {@link #revision(Nodeid)} earlier. |
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81 * |
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82 * @param nodeid - unique revision identifier, Note, use of <code>null</code> or {@link Nodeid#NULL} is senseless |
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83 * @return <code>this</code> for convenience |
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84 */ |
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85 public HgCatCommand revision(Nodeid nodeid) { |
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86 if (nodeid != null && nodeid.isNull()) { |
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87 nodeid = null; |
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88 } |
| 107 | 89 revision = nodeid; |
| 90 localRevision = BAD_REVISION; | |
| 91 return this; | |
| 92 } | |
| 93 | |
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94 /** |
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95 * Runs the command with current set of parameters and pipes data to provided sink. |
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96 * |
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97 * @param sink output channel to write data to. |
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98 * @throws HgDataStreamException |
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99 * @throws IllegalArgumentException when command arguments are incomplete or wrong |
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100 */ |
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101 public void execute(ByteChannel sink) throws HgDataStreamException, IOException, CancelledException { |
| 107 | 102 if (localRevision == BAD_REVISION && revision == null) { |
| 103 throw new IllegalArgumentException("Either local file revision number or nodeid shall be specified"); | |
| 104 } | |
| 105 if (file == null) { | |
| 106 throw new IllegalArgumentException("Name of the file is missing"); | |
| 107 } | |
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108 if (sink == null) { |
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109 throw new IllegalArgumentException("Need an output channel"); |
| 107 | 110 } |
| 111 HgDataFile dataFile = repo.getFileNode(file); | |
| 112 if (!dataFile.exists()) { | |
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113 throw new HgDataStreamException(file.toString(), new FileNotFoundException(file.toString())); |
| 107 | 114 } |
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115 int revToExtract; |
| 107 | 116 if (revision != null) { |
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117 revToExtract = dataFile.getLocalRevision(revision); |
| 107 | 118 } else { |
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119 revToExtract = localRevision; |
| 107 | 120 } |
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121 dataFile.contentWithFilters(revToExtract, sink); |
| 107 | 122 } |
| 123 } |