Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 317:09628675bcee

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Rework file history build approach to match rest of the API
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Sep 2011 03:20:28 +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 }