Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 233:1d389c0cb0a5

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Optimize file history walk not to iterat over whole changelog for sparse and distant revisions
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 03 Jun 2011 04:50:09 +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 }