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annotate src/org/tmatesoft/hg/core/CatCommand.java @ 115:c0cc2535462c

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Introduced channels to pipeline (and easily filter) data streams
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 03 Feb 2011 23:32:08 +0100
parents 7ec89d637f50
children b1d6208fb517
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1 /*
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2 * Copyright (c) 2011 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@svnkit.com
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16 */
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17 package org.tmatesoft.hg.core;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import java.io.FileNotFoundException;
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23
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24 import org.tmatesoft.hg.repo.HgDataFile;
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25 import org.tmatesoft.hg.repo.HgRepository;
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26 import org.tmatesoft.hg.util.ByteChannel;
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27
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28 /**
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29 * Command to obtain content of a
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30 *
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31 * @author Artem Tikhomirov
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32 * @author TMate Software Ltd.
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33 */
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34 public class CatCommand {
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35
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36 private final HgRepository repo;
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37 private Path file;
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38 private int localRevision = TIP;
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39 private Nodeid revision;
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40
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41 public CatCommand(HgRepository hgRepo) {
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42 repo = hgRepo;
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43 }
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44
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45 public CatCommand file(Path fname) {
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46 file = fname;
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47 return this;
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48 }
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49
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50 // rev can't be WORKING_COPY (if allowed, need to implement in #execute())
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51 public CatCommand revision(int rev) {
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52 localRevision = rev;
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53 revision = null;
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54 return this;
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55 }
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56
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57 public CatCommand revision(Nodeid nodeid) {
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58 revision = nodeid;
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59 localRevision = BAD_REVISION;
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60 return this;
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61 }
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62
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63 public void execute(ByteChannel sink) throws Exception /*TODO own exception type*/ {
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64 if (localRevision == BAD_REVISION && revision == null) {
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65 throw new IllegalArgumentException("Either local file revision number or nodeid shall be specified");
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66 }
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67 if (file == null) {
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68 throw new IllegalArgumentException("Name of the file is missing");
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69 }
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70 if (sink == null) {
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71 throw new IllegalArgumentException();
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72 }
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73 HgDataFile dataFile = repo.getFileNode(file);
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74 if (!dataFile.exists()) {
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75 throw new FileNotFoundException();
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76 }
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77 int revToExtract;
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78 if (revision != null) {
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79 revToExtract = dataFile.getLocalRevision(revision);
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80 } else {
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81 revToExtract = localRevision;
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82 }
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83 dataFile.content(revToExtract, sink);
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84 }
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85 }