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annotate src/org/tmatesoft/hg/core/CatCommand.java @ 107:7ec89d637f50

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CatCommand
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 29 Jan 2011 02:16:01 +0100
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children c0cc2535462c
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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 import java.io.IOException;
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24 import java.io.OutputStream;
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25
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26 import org.tmatesoft.hg.repo.HgDataFile;
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27 import org.tmatesoft.hg.repo.HgRepository;
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28
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29 /**
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30 * Command to obtain content of a
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31 *
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32 * @author Artem Tikhomirov
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33 * @author TMate Software Ltd.
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34 */
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35 public class CatCommand {
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36
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37 private final HgRepository repo;
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38 private Path file;
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39 private int localRevision = TIP;
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40 private Nodeid revision;
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41
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42 public CatCommand(HgRepository hgRepo) {
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43 repo = hgRepo;
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44 }
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45
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46 public CatCommand file(Path fname) {
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47 file = fname;
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48 return this;
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49 }
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50
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51 // rev can't be WORKING_COPY (if allowed, need to implement in #execute())
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52 public CatCommand revision(int rev) {
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53 localRevision = rev;
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54 revision = null;
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55 return this;
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56 }
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57
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58 public CatCommand revision(Nodeid nodeid) {
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59 revision = nodeid;
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60 localRevision = BAD_REVISION;
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61 return this;
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62 }
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63
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64 public void execute(OutputStream os) throws IOException /*TODO own exception type*/ {
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65 if (localRevision == BAD_REVISION && revision == null) {
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66 throw new IllegalArgumentException("Either local file revision number or nodeid shall be specified");
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67 }
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68 if (file == null) {
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69 throw new IllegalArgumentException("Name of the file is missing");
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70 }
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71 if (os == null) {
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72 throw new IllegalArgumentException();
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73 }
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74 HgDataFile dataFile = repo.getFileNode(file);
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75 if (!dataFile.exists()) {
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76 throw new FileNotFoundException();
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77 }
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78 byte[] content;
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79 if (revision != null) {
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80 content = dataFile.content(revision);
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81 } else {
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82 content = dataFile.content(localRevision);
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83 }
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84 os.write(content);
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85 }
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86 }