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annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 148:1a7a9a20e1f9

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Exceptions, javadoc. Initial cancel and progress support
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 23 Feb 2011 22:36:28 +0100
parents 4a948ec83980
children d5268ca7715b
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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@hg4j.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.HgInternals.wrongLocalRevision;
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20 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22
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23 import java.io.FileNotFoundException;
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24 import java.io.IOException;
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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 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;
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31
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32 /**
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33 * Command to obtain content of a file, 'hg cat' counterpart.
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public class HgCatCommand {
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39
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40 private final HgRepository repo;
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41 private Path file;
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42 private int localRevision = TIP;
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43 private Nodeid revision;
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44
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45 public HgCatCommand(HgRepository hgRepo) {
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46 repo = hgRepo;
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47 }
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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 }
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59 file = fname;
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60 return this;
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61 }
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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 }
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74 localRevision = rev;
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75 revision = null;
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76 return this;
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77 }
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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 }
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89 revision = nodeid;
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90 localRevision = BAD_REVISION;
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91 return this;
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92 }
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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 {
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102 if (localRevision == BAD_REVISION && revision == null) {
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103 throw new IllegalArgumentException("Either local file revision number or nodeid shall be specified");
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104 }
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105 if (file == null) {
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106 throw new IllegalArgumentException("Name of the file is missing");
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107 }
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108 if (sink == null) {
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109 throw new IllegalArgumentException("Need an output channel");
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110 }
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111 HgDataFile dataFile = repo.getFileNode(file);
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112 if (!dataFile.exists()) {
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113 throw new HgDataStreamException(file.toString(), new FileNotFoundException(file.toString()));
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114 }
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115 int revToExtract;
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116 if (revision != null) {
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117 revToExtract = dataFile.getLocalRevision(revision);
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118 } else {
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119 revToExtract = localRevision;
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120 }
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121 dataFile.content(revToExtract, sink, true);
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122 }
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123 }