Mercurial > hg4j
annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 140:1c1891ad1c73
Slight optimization
| author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
|---|---|
| date | Wed, 16 Feb 2011 22:33:04 +0100 |
| parents | 4a948ec83980 |
| children | 1a7a9a20e1f9 |
| 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 | |
| 19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION; | |
| 20 import static org.tmatesoft.hg.repo.HgRepository.TIP; | |
| 21 | |
| 22 import java.io.FileNotFoundException; | |
| 23 | |
| 24 import org.tmatesoft.hg.repo.HgDataFile; | |
| 25 import org.tmatesoft.hg.repo.HgRepository; | |
|
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26 import org.tmatesoft.hg.util.ByteChannel; |
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27 import org.tmatesoft.hg.util.Path; |
| 107 | 28 |
| 29 /** | |
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30 * Command to obtain content of a file, 'hg cat' counterpart. |
| 107 | 31 * |
| 32 * @author Artem Tikhomirov | |
| 33 * @author TMate Software Ltd. | |
| 34 */ | |
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35 public class HgCatCommand { |
| 107 | 36 |
| 37 private final HgRepository repo; | |
| 38 private Path file; | |
| 39 private int localRevision = TIP; | |
| 40 private Nodeid revision; | |
| 41 | |
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42 public HgCatCommand(HgRepository hgRepo) { |
| 107 | 43 repo = hgRepo; |
| 44 } | |
| 45 | |
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46 public HgCatCommand file(Path fname) { |
| 107 | 47 file = fname; |
| 48 return this; | |
| 49 } | |
| 50 | |
| 51 // rev can't be WORKING_COPY (if allowed, need to implement in #execute()) | |
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52 public HgCatCommand revision(int rev) { |
| 107 | 53 localRevision = rev; |
| 54 revision = null; | |
| 55 return this; | |
| 56 } | |
| 57 | |
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58 public HgCatCommand revision(Nodeid nodeid) { |
| 107 | 59 revision = nodeid; |
| 60 localRevision = BAD_REVISION; | |
| 61 return this; | |
| 62 } | |
| 63 | |
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64 public void execute(ByteChannel sink) throws Exception /*TODO own exception type*/ { |
| 107 | 65 if (localRevision == BAD_REVISION && revision == null) { |
| 66 throw new IllegalArgumentException("Either local file revision number or nodeid shall be specified"); | |
| 67 } | |
| 68 if (file == null) { | |
| 69 throw new IllegalArgumentException("Name of the file is missing"); | |
| 70 } | |
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71 if (sink == null) { |
| 107 | 72 throw new IllegalArgumentException(); |
| 73 } | |
| 74 HgDataFile dataFile = repo.getFileNode(file); | |
| 75 if (!dataFile.exists()) { | |
| 76 throw new FileNotFoundException(); | |
| 77 } | |
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78 int revToExtract; |
| 107 | 79 if (revision != null) { |
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80 revToExtract = dataFile.getLocalRevision(revision); |
| 107 | 81 } else { |
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82 revToExtract = localRevision; |
| 107 | 83 } |
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84 dataFile.content(revToExtract, sink, true); |
| 107 | 85 } |
| 86 } |