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annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 277:74e7493a042a

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Favor delegation over generalization
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 29 Aug 2011 23:14:59 +0200
parents 3fbfce107f94
children d68dcb3b5f49
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
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25 import org.tmatesoft.hg.repo.HgDataFile;
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26 import org.tmatesoft.hg.repo.HgRepository;
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27 import org.tmatesoft.hg.util.ByteChannel;
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28 import org.tmatesoft.hg.util.CancelledException;
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29 import org.tmatesoft.hg.util.Path;
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30
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31 /**
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32 * Command to obtain content of a file, 'hg cat' counterpart.
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class HgCatCommand extends HgAbstractCommand<HgCatCommand> {
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38
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39 private final HgRepository repo;
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40 private Path file;
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41 private int localRevision = TIP;
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42 private Nodeid revision;
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43 private Nodeid cset;
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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 * Select specific local revision of the file to cat. Note, revision numbering is of particular file, not that of
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65 * repository (i.e. revision 0 means initial content of the file, irrespective of changeset revision at the time of commit)
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66 *
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67 * Invocation of this method clears revision set with {@link #revision(Nodeid)} or {@link #revision(int)} earlier.
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68 *
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69 * XXX rev can't be WORKING_COPY (if allowed, need to implement in #execute())
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70 * @param rev local revision number, non-negative, or one of predefined constants. Note, use of {@link HgRepository#BAD_REVISION},
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71 * although possible, makes little sense (command would fail if executed).
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72 * @return <code>this</code> for convenience
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73 */
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74 public HgCatCommand revision(int rev) {
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75 if (wrongLocalRevision(rev)) {
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76 throw new IllegalArgumentException(String.valueOf(rev));
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77 }
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78 localRevision = rev;
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79 revision = null;
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80 cset = null;
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81 return this;
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82 }
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83
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84 /**
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85 * Select revision to read. Note, this revision is file revision (i.e. the one from manifest), not the changeset revision.
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86 *
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87 * Invocation of this method clears revision set with {@link #revision(int)} or {@link #revision(Nodeid)} earlier.
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88 *
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89 * @param nodeid - unique file revision identifier, Note, use of <code>null</code> or {@link Nodeid#NULL} is senseless
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90 * @return <code>this</code> for convenience
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91 */
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92 public HgCatCommand revision(Nodeid nodeid) {
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93 if (nodeid != null && nodeid.isNull()) {
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94 nodeid = null;
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95 }
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96 revision = nodeid;
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97 localRevision = BAD_REVISION;
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98 cset = null;
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99 return this;
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100 }
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102 /**
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103 * Parameterize the command from file revision object.
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104 *
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105 * @param fileRev file revision to cat
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106 * @return <code>this</code> for convenience
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107 */
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108 public HgCatCommand revision(HgFileRevision fileRev) {
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109 return file(fileRev.getPath()).revision(fileRev.getRevision());
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110 }
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111
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112 /**
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113 * 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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114 * operates in terms of repository global revisions (aka changesets).
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115 *
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116 * Invocation of this method clears local file revisions selection.
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117 *
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118 * @param nodeid changeset revision
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119 * @return <code>this</code> for convenience
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120 */
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121 public HgCatCommand changeset(Nodeid nodeid) {
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122 localRevision = BAD_REVISION;
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123 revision = null;
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124 cset = nodeid;
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125 return this;
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126 }
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127
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128 /**
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129 * Runs the command with current set of parameters and pipes data to provided sink.
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130 *
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131 * @param sink output channel to write data to.
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132 * @throws HgDataStreamException
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133 * @throws IllegalArgumentException when command arguments are incomplete or wrong
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134 */
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135 public void execute(ByteChannel sink) throws HgDataStreamException, CancelledException {
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136 if (localRevision == BAD_REVISION && revision == null && cset == null) {
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137 throw new IllegalArgumentException("File revision, corresponing local number, or a changset nodeid shall be specified");
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138 }
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139 if (file == null) {
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140 throw new IllegalArgumentException("Name of the file is missing");
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141 }
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142 if (sink == null) {
148
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143 throw new IllegalArgumentException("Need an output channel");
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144 }
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145 HgDataFile dataFile = repo.getFileNode(file);
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146 if (!dataFile.exists()) {
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147 throw new HgDataStreamException(file, new FileNotFoundException(file.toString()));
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148 }
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149 int revToExtract;
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150 if (cset != null) {
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151 int csetRev = repo.getChangelog().getLocalRevision(cset);
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152 Nodeid toExtract = null;
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153 do {
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154 toExtract = repo.getManifest().getFileRevision(csetRev, file);
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155 if (toExtract == null) {
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156 if (dataFile.isCopy()) {
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157 file = dataFile.getCopySourceName();
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158 dataFile = repo.getFileNode(file);
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159 } else {
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160 break;
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161 }
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162 }
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163 } while (toExtract == null);
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164 if (toExtract == null) {
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165 throw new HgBadStateException(String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation()));
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166 }
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167 revToExtract = dataFile.getLocalRevision(toExtract);
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168 } else if (revision != null) {
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169 revToExtract = dataFile.getLocalRevision(revision);
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170 } else {
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171 revToExtract = localRevision;
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172 }
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173 dataFile.contentWithFilters(revToExtract, sink);
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174 }
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175 }