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annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents b286222158be
children
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.wrongRevisionIndex;
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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.IOException;
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24 import java.nio.ByteBuffer;
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25
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26 import org.tmatesoft.hg.internal.CsetParamKeeper;
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27 import org.tmatesoft.hg.repo.HgDataFile;
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28 import org.tmatesoft.hg.repo.HgRepository;
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29 import org.tmatesoft.hg.repo.HgRuntimeException;
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30 import org.tmatesoft.hg.util.Adaptable;
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31 import org.tmatesoft.hg.util.ByteChannel;
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32 import org.tmatesoft.hg.util.CancelSupport;
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33 import org.tmatesoft.hg.util.CancelledException;
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34 import org.tmatesoft.hg.util.Outcome;
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35 import org.tmatesoft.hg.util.Path;
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36
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37 /**
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38 * Command to obtain content of a file, 'hg cat' counterpart.
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39 *
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public class HgCatCommand extends HgAbstractCommand<HgCatCommand> {
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44
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45 private final HgRepository repo;
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46 private Path file;
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47 private int revisionIndex = TIP;
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48 private Nodeid revision;
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49 private Nodeid cset;
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50
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51 public HgCatCommand(HgRepository hgRepo) {
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52 repo = hgRepo;
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53 }
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54
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55 /**
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56 * File to read, required parameter
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57 * @param fname path to a repository file, can't be <code>null</code>
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58 * @return <code>this</code> for convenience
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59 * @throws IllegalArgumentException if supplied fname is null or points to directory
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60 */
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61 public HgCatCommand file(Path fname) {
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62 if (fname == null || fname.isDirectory()) {
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63 throw new IllegalArgumentException(String.valueOf(fname));
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64 }
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65 file = fname;
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66 return this;
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67 }
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68
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69 /**
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70 * Select specific revision of the file to cat with revision local index. Note, revision numbering is of particular file, not that of
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71 * repository (i.e. revision 0 means initial content of the file, irrespective of changeset revision at the time of commit)
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72 *
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73 * Invocation of this method clears revision set with {@link #revision(Nodeid)} or {@link #revision(int)} earlier.
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74 *
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75 * @param fileRevisionIndex - revision local index, non-negative, or one of predefined constants. Note, use of {@link HgRepository#BAD_REVISION},
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76 * although possible, makes little sense (command would fail if executed).
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77 * @return <code>this</code> for convenience
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78 */
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79 public HgCatCommand revision(int fileRevisionIndex) { // TODO [2.0 API break] shall throw HgBadArgumentException, like other commands do
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80 if (wrongRevisionIndex(fileRevisionIndex)) {
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81 throw new IllegalArgumentException(String.valueOf(fileRevisionIndex));
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82 }
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83 revisionIndex = fileRevisionIndex;
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84 revision = null;
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85 cset = null;
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86 return this;
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87 }
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88
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89 /**
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90 * Select file revision to read. Note, this revision is file revision (i.e. the one from manifest), not the changeset revision.
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91 *
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92 * Invocation of this method clears revision set with {@link #revision(int)} or {@link #revision(Nodeid)} earlier.
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93 *
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94 * @param nodeid - unique file revision identifier, Note, use of <code>null</code> or {@link Nodeid#NULL} is senseless
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95 * @return <code>this</code> for convenience
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96 */
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97 public HgCatCommand revision(Nodeid nodeid) {
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98 if (nodeid != null && nodeid.isNull()) {
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99 nodeid = null;
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100 }
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101 revision = nodeid;
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102 revisionIndex = BAD_REVISION;
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103 cset = null;
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104 return this;
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105 }
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107 /**
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108 * Parameterize the command from file revision object.
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109 *
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110 * @param fileRev file revision to cat
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111 * @return <code>this</code> for convenience
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112 */
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113 public HgCatCommand revision(HgFileRevision fileRev) {
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114 return file(fileRev.getPath()).revision(fileRev.getRevision());
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115 }
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116
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117 /**
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118 * 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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119 * operates in terms of repository global revisions (aka changesets).
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120 *
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121 * Invocation of this method clears selection of a file revision with its index.
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122 *
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123 * @param nodeid changeset revision
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124 * @return <code>this</code> for convenience
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125 */
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126 public HgCatCommand changeset(Nodeid nodeid) {
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127 revisionIndex = BAD_REVISION;
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128 revision = null;
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129 cset = nodeid;
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130 // TODO [2.0 API break] shall use CsetParamKeeper instead, but Exception thrown would break the API
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131 return this;
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132 }
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133
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134 /**
683
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135 * Select file by changeset
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136 * @see #changeset(Nodeid)
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137 * @param revisionIndex index of changelog revision
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138 * @return <code>this</code> for convenience
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139 * @throws HgBadArgumentException if failed to find supplied changeset revision
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140 */
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141 public HgCatCommand changeset(int revisionIndex) throws HgBadArgumentException {
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142 int ri = new CsetParamKeeper(repo).set(revisionIndex).get();
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143 return changeset(repo.getChangelog().getRevision(ri));
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144 }
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145
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146 /**
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147 * Runs the command with current set of parameters and pipes data to provided sink.
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148 *
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149 * @param sink output channel to write data to.
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150 *
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151 * @throws HgBadArgumentException if no target file node found
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152 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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153 * @throws CancelledException if execution of the command was cancelled
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154 * @throws IllegalArgumentException when command arguments are incomplete or wrong
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155 */
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156 public void execute(ByteChannel sink) throws HgException, CancelledException {
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157 // XXX perhaps, IAE together with HgBadArgumentException is not the best idea
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158 if (revisionIndex == BAD_REVISION && revision == null && cset == null) {
232
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159 throw new IllegalArgumentException("File revision, corresponing local number, or a changset nodeid shall be specified");
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160 }
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161 if (file == null) {
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162 throw new IllegalArgumentException("Name of the file is missing");
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163 }
115
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164 if (sink == null) {
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165 throw new IllegalArgumentException("Need an output channel");
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166 }
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167 try {
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168 HgDataFile dataFile = repo.getFileNode(file);
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169 if (!dataFile.exists()) {
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170 // TODO may benefit from repo.getStoragePath to print revlog location in addition to human-friendly file path
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171 throw new HgPathNotFoundException(String.format("File %s not found in the repository", file), file);
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172 }
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173 int revToExtract;
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174 if (cset != null) {
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175 // TODO HgChangesetFileSneaker is handy, but bit too much here, shall extract follow rename code into separate utility
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176 HgChangesetFileSneaker fsneaker = new HgChangesetFileSneaker(repo);
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177 fsneaker.changeset(cset).followRenames(true);
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178 Outcome o = fsneaker.check(file);
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179 if (!o.isOk()) {
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180 if (o.getException() instanceof HgRuntimeException) {
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181 throw new HgLibraryFailureException(o.getMessage(), (HgRuntimeException) o.getException());
427
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182 }
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183 throw new HgBadArgumentException(o.getMessage(), o.getException()).setFileName(file).setRevision(cset);
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184 }
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185 if (!fsneaker.exists()) {
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186 throw new HgPathNotFoundException(o.getMessage(), file).setRevision(cset);
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187 }
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188 Nodeid toExtract = fsneaker.revision();
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189 if (fsneaker.hasAnotherName()) {
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190 dataFile = repo.getFileNode(fsneaker.filename());
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191 }
427
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192 revToExtract = dataFile.getRevisionIndex(toExtract);
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193 } else if (revision != null) {
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194 revToExtract = dataFile.getRevisionIndex(revision);
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195 } else {
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196 revToExtract = revisionIndex;
232
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197 }
427
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198 ByteChannel sinkWrap;
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199 if (getCancelSupport(null, false) == null) {
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200 // no command-specific cancel helper, no need for extra proxy
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201 // sink itself still may supply CS
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202 sinkWrap = sink;
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203 } else {
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204 // try CS from sink, if any. at least there is CS from command
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205 CancelSupport cancelHelper = getCancelSupport(sink, true);
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206 cancelHelper.checkCancelled();
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207 sinkWrap = new ByteChannelProxy(sink, cancelHelper);
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208 }
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209 dataFile.contentWithFilters(revToExtract, sinkWrap);
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210 } catch (HgRuntimeException ex) {
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211 throw new HgLibraryFailureException(ex);
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212 }
322
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213 }
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214
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215 private static class ByteChannelProxy implements ByteChannel, Adaptable {
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216 private final ByteChannel delegate;
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217 private final CancelSupport cancelHelper;
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218
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219 public ByteChannelProxy(ByteChannel _delegate, CancelSupport cs) {
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220 assert _delegate != null;
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221 delegate = _delegate;
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222 cancelHelper = cs;
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223 }
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224 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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225 return delegate.write(buffer);
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226 }
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227
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228 public <T> T getAdapter(Class<T> adapterClass) {
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229 if (CancelSupport.class == adapterClass) {
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230 return adapterClass.cast(cancelHelper);
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231 }
356
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232 return Adaptable.Factory.getAdapter(delegate, adapterClass, null);
322
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233 }
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234 }
7ec89d637f50 CatCommand
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
235 }