Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 423:9c9c442b5f2e

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Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 23 Mar 2012 22:51:18 +0100
parents 0ae53c32ecef
children 31a89587eb04
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 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.repo.HgDataFile;
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27 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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28 import org.tmatesoft.hg.repo.HgInvalidFileException;
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29 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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30 import org.tmatesoft.hg.repo.HgRepository;
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31 import org.tmatesoft.hg.util.Adaptable;
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32 import org.tmatesoft.hg.util.ByteChannel;
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33 import org.tmatesoft.hg.util.CancelSupport;
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34 import org.tmatesoft.hg.util.CancelledException;
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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) {
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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 return this;
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131 }
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132
148
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133 /**
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134 * Runs the command with current set of parameters and pipes data to provided sink.
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135 *
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136 * @param sink output channel to write data to.
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137 *
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138 * @throws HgBadArgumentException if no target file node found
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139 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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140 * @throws HgInvalidFileException if access to file in working directory failed
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141 * @throws HgException in case of some other library issue
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142 * @throws CancelledException if execution of the operation was cancelled
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143 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog (<em>runtime exception</em>)
148
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144 * @throws IllegalArgumentException when command arguments are incomplete or wrong
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145 */
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146 public void execute(ByteChannel sink) throws HgException, CancelledException {
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147 // XXX perhaps, IAE together with HgBadArgumentException is not the best idea
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148 if (revisionIndex == BAD_REVISION && revision == null && cset == null) {
232
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149 throw new IllegalArgumentException("File revision, corresponing local number, or a changset nodeid shall be specified");
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150 }
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151 if (file == null) {
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152 throw new IllegalArgumentException("Name of the file is missing");
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153 }
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154 if (sink == null) {
148
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155 throw new IllegalArgumentException("Need an output channel");
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156 }
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157 HgDataFile dataFile = repo.getFileNode(file);
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158 if (!dataFile.exists()) {
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159 // TODO may benefit from repo.getStoragePath to print revlog location in addition to human-friendly file path
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160 throw new HgBadArgumentException(String.format("File %s not found in the repository", file), null).setFileName(file);
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161 }
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162 int revToExtract;
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163 if (cset != null) {
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164 int csetRev = repo.getChangelog().getRevisionIndex(cset);
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165 Nodeid toExtract = null;
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166 do {
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167 // TODO post-1.0 perhaps, HgChangesetFileSneaker may come handy?
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168 toExtract = repo.getManifest().getFileRevision(csetRev, file);
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169 if (toExtract == null) {
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170 if (dataFile.isCopy()) {
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171 file = dataFile.getCopySourceName();
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172 dataFile = repo.getFileNode(file);
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173 } else {
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174 break;
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175 }
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176 }
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177 } while (toExtract == null);
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178 if (toExtract == null) {
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179 // TODO explicit FileNotFoundException?
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180 throw new HgBadArgumentException(String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation()), null);
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181 }
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182 revToExtract = dataFile.getRevisionIndex(toExtract);
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183 } else if (revision != null) {
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184 revToExtract = dataFile.getRevisionIndex(revision);
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185 } else {
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186 revToExtract = revisionIndex;
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187 }
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188 ByteChannel sinkWrap;
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189 if (getCancelSupport(null, false) == null) {
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190 // no command-specific cancel helper, no need for extra proxy
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191 // sink itself still may supply CS
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192 sinkWrap = sink;
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193 } else {
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194 // try CS from sink, if any. at least there is CS from command
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195 CancelSupport cancelHelper = getCancelSupport(sink, true);
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196 cancelHelper.checkCancelled();
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197 sinkWrap = new ByteChannelProxy(sink, cancelHelper);
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198 }
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199 dataFile.contentWithFilters(revToExtract, sinkWrap);
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200 }
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201
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202 private static class ByteChannelProxy implements ByteChannel, Adaptable {
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203 private final ByteChannel delegate;
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204 private final CancelSupport cancelHelper;
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205
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206 public ByteChannelProxy(ByteChannel _delegate, CancelSupport cs) {
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207 assert _delegate != null;
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208 delegate = _delegate;
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209 cancelHelper = cs;
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210 }
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211 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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212 return delegate.write(buffer);
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213 }
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214
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215 public <T> T getAdapter(Class<T> adapterClass) {
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216 if (CancelSupport.class == adapterClass) {
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217 return adapterClass.cast(cancelHelper);
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218 }
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219 return Adaptable.Factory.getAdapter(delegate, adapterClass, null);
322
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220 }
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221 }
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222 }