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annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 236:883300108179

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 09 Jun 2011 06:13:43 +0200
parents b7347daa50e3
children 6e1373b54e9b
rev   line source
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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 extends HgAbstractCommand<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 private Nodeid cset;
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45
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46 public HgCatCommand(HgRepository hgRepo) {
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47 repo = hgRepo;
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48 }
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49
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50 /**
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51 * File to read, required parameter
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52 * @param fname path to a repository file, can't be <code>null</code>
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53 * @return <code>this</code> for convenience
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54 * @throws IllegalArgumentException if supplied fname is null or points to directory
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55 */
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56 public HgCatCommand file(Path fname) {
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57 if (fname == null || fname.isDirectory()) {
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58 throw new IllegalArgumentException(String.valueOf(fname));
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59 }
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60 file = fname;
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61 return this;
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62 }
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63
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64 /**
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65 * Select specific local revision of the file to cat. Note, revision numbering is of particular file, not that of
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66 * repository (i.e. revision 0 means initial content of the file, irrespective of changeset revision at the time of commit)
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67 *
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68 * Invocation of this method clears revision set with {@link #revision(Nodeid)} or {@link #revision(int)} earlier.
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69 *
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70 * XXX rev can't be WORKING_COPY (if allowed, need to implement in #execute())
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71 * @param rev local revision number, non-negative, or one of predefined constants. Note, use of {@link HgRepository#BAD_REVISION},
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72 * although possible, makes little sense (command would fail if executed).
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73 * @return <code>this</code> for convenience
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74 */
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75 public HgCatCommand revision(int rev) {
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76 if (wrongLocalRevision(rev)) {
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77 throw new IllegalArgumentException(String.valueOf(rev));
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78 }
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79 localRevision = rev;
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80 revision = null;
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81 cset = null;
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82 return this;
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83 }
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84
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85 /**
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86 * Select revision to read. Note, this revision is file revision (i.e. the one from manifest), not the changeset revision.
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87 *
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88 * Invocation of this method clears revision set with {@link #revision(int)} or {@link #revision(Nodeid)} earlier.
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89 *
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90 * @param nodeid - unique file revision identifier, Note, use of <code>null</code> or {@link Nodeid#NULL} is senseless
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91 * @return <code>this</code> for convenience
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92 */
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93 public HgCatCommand revision(Nodeid nodeid) {
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94 if (nodeid != null && nodeid.isNull()) {
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95 nodeid = null;
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96 }
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97 revision = nodeid;
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98 localRevision = BAD_REVISION;
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99 cset = null;
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100 return this;
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101 }
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102
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103 /**
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104 * Select whatever revision of the file that was actual at the time of the specified changeset. Unlike {@link #revision(int)} or {@link #revision(Nodeid)}, this method
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105 * operates in terms of repository global revisions (aka changesets).
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106 *
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107 * Invocation of this method clears local file revisions selection.
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108 *
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109 * @param nodeid changeset revision
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110 * @return <code>this</code> for convenience
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111 */
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112 public HgCatCommand changeset(Nodeid nodeid) {
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113 localRevision = BAD_REVISION;
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114 revision = null;
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115 cset = nodeid;
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116 return this;
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117 }
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118
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119 /**
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120 * Runs the command with current set of parameters and pipes data to provided sink.
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121 *
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122 * @param sink output channel to write data to.
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123 * @throws HgDataStreamException
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124 * @throws IllegalArgumentException when command arguments are incomplete or wrong
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125 */
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126 public void execute(ByteChannel sink) throws HgDataStreamException, IOException, CancelledException {
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127 if (localRevision == BAD_REVISION && revision == null && cset == null) {
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128 throw new IllegalArgumentException("File revision, corresponing local number, or a changset nodeid shall be specified");
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129 }
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130 if (file == null) {
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131 throw new IllegalArgumentException("Name of the file is missing");
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132 }
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133 if (sink == null) {
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134 throw new IllegalArgumentException("Need an output channel");
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135 }
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136 HgDataFile dataFile = repo.getFileNode(file);
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137 if (!dataFile.exists()) {
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138 throw new HgDataStreamException(file, new FileNotFoundException(file.toString()));
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139 }
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140 int revToExtract;
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141 if (cset != null) {
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142 int csetRev = repo.getChangelog().getLocalRevision(cset);
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143 Nodeid toExtract = null;
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144 do {
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145 toExtract = repo.getManifest().getFileRevision(csetRev, file);
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146 if (toExtract == null) {
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147 if (dataFile.isCopy()) {
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148 file = dataFile.getCopySourceName();
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149 dataFile = repo.getFileNode(file);
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150 } else {
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151 break;
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152 }
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153 }
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154 } while (toExtract == null);
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155 if (toExtract == null) {
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156 throw new HgBadStateException(String.format("File %s not its origins were not known at repository %s revision", file, cset.shortNotation()));
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157 }
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158 revToExtract = dataFile.getLocalRevision(toExtract);
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159 } else if (revision != null) {
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160 revToExtract = dataFile.getLocalRevision(revision);
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161 } else {
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162 revToExtract = localRevision;
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163 }
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164 dataFile.contentWithFilters(revToExtract, sink);
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165 }
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166 }