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annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 421:fdd7d756dea0 v0.8.5

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Allow IOException from DataAccess methods for subclasses with non-trivial implementations, to avoid exception dumps when inapropriate
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 23:09:11 +0100
parents 0ae53c32ecef
children 9c9c442b5f2e
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.HgRepository;
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28 import org.tmatesoft.hg.util.Adaptable;
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29 import org.tmatesoft.hg.util.ByteChannel;
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30 import org.tmatesoft.hg.util.CancelSupport;
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31 import org.tmatesoft.hg.util.CancelledException;
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32 import org.tmatesoft.hg.util.Path;
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33
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34 /**
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35 * Command to obtain content of a file, 'hg cat' counterpart.
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36 *
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37 * @author Artem Tikhomirov
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38 * @author TMate Software Ltd.
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39 */
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40 public class HgCatCommand extends HgAbstractCommand<HgCatCommand> {
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41
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42 private final HgRepository repo;
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43 private Path file;
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44 private int revisionIndex = TIP;
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45 private Nodeid revision;
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46 private Nodeid cset;
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47
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48 public HgCatCommand(HgRepository hgRepo) {
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49 repo = hgRepo;
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50 }
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51
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52 /**
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53 * File to read, required parameter
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54 * @param fname path to a repository file, can't be <code>null</code>
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55 * @return <code>this</code> for convenience
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56 * @throws IllegalArgumentException if supplied fname is null or points to directory
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57 */
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58 public HgCatCommand file(Path fname) {
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59 if (fname == null || fname.isDirectory()) {
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60 throw new IllegalArgumentException(String.valueOf(fname));
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61 }
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62 file = fname;
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63 return this;
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64 }
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65
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66 /**
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67 * 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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68 * repository (i.e. revision 0 means initial content of the file, irrespective of changeset revision at the time of commit)
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69 *
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70 * Invocation of this method clears revision set with {@link #revision(Nodeid)} or {@link #revision(int)} earlier.
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71 *
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72 * @param fileRevisionIndex - revision local index, non-negative, or one of predefined constants. Note, use of {@link HgRepository#BAD_REVISION},
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73 * although possible, makes little sense (command would fail if executed).
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74 * @return <code>this</code> for convenience
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75 */
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76 public HgCatCommand revision(int fileRevisionIndex) {
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77 if (wrongRevisionIndex(fileRevisionIndex)) {
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78 throw new IllegalArgumentException(String.valueOf(fileRevisionIndex));
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79 }
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80 revisionIndex = fileRevisionIndex;
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81 revision = null;
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82 cset = null;
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83 return this;
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84 }
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85
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86 /**
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87 * 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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88 *
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89 * Invocation of this method clears revision set with {@link #revision(int)} or {@link #revision(Nodeid)} earlier.
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90 *
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91 * @param nodeid - unique file revision identifier, Note, use of <code>null</code> or {@link Nodeid#NULL} is senseless
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92 * @return <code>this</code> for convenience
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93 */
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94 public HgCatCommand revision(Nodeid nodeid) {
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95 if (nodeid != null && nodeid.isNull()) {
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96 nodeid = null;
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97 }
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98 revision = nodeid;
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99 revisionIndex = BAD_REVISION;
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100 cset = null;
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101 return this;
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102 }
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104 /**
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105 * Parameterize the command from file revision object.
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106 *
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107 * @param fileRev file revision to cat
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108 * @return <code>this</code> for convenience
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109 */
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110 public HgCatCommand revision(HgFileRevision fileRev) {
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111 return file(fileRev.getPath()).revision(fileRev.getRevision());
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112 }
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113
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114 /**
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115 * 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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116 * operates in terms of repository global revisions (aka changesets).
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117 *
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118 * Invocation of this method clears selection of a file revision with its index.
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119 *
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120 * @param nodeid changeset revision
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121 * @return <code>this</code> for convenience
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122 */
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123 public HgCatCommand changeset(Nodeid nodeid) {
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124 revisionIndex = BAD_REVISION;
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125 revision = null;
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126 cset = nodeid;
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127 return this;
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128 }
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129
148
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130 /**
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131 * Runs the command with current set of parameters and pipes data to provided sink.
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132 *
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133 * @param sink output channel to write data to.
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134 *
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135 * @throws HgBadArgumentException if no target file node found
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136 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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137 * @throws HgInvalidFileException if access to file in working directory failed
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138 * @throws HgException in case of some other library issue
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139 * @throws CancelledException if execution of the operation was cancelled
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140 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog (<em>runtime exception</em>)
148
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141 * @throws IllegalArgumentException when command arguments are incomplete or wrong
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142 */
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143 public void execute(ByteChannel sink) throws HgException, CancelledException {
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144 // XXX perhaps, IAE together with HgBadArgumentException is not the best idea
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145 if (revisionIndex == BAD_REVISION && revision == null && cset == null) {
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146 throw new IllegalArgumentException("File revision, corresponing local number, or a changset nodeid shall be specified");
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147 }
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148 if (file == null) {
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149 throw new IllegalArgumentException("Name of the file is missing");
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150 }
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151 if (sink == null) {
148
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152 throw new IllegalArgumentException("Need an output channel");
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153 }
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154 HgDataFile dataFile = repo.getFileNode(file);
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155 if (!dataFile.exists()) {
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156 // TODO may benefit from repo.getStoragePath to print revlog location in addition to human-friendly file path
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157 throw new HgBadArgumentException(String.format("File %s not found in the repository", file), null).setFileName(file);
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158 }
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159 int revToExtract;
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160 if (cset != null) {
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161 int csetRev = repo.getChangelog().getRevisionIndex(cset);
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162 Nodeid toExtract = null;
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163 do {
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164 toExtract = repo.getManifest().getFileRevision(csetRev, file);
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165 if (toExtract == null) {
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166 if (dataFile.isCopy()) {
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167 file = dataFile.getCopySourceName();
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168 dataFile = repo.getFileNode(file);
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169 } else {
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170 break;
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171 }
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172 }
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173 } while (toExtract == null);
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174 if (toExtract == null) {
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175 throw new HgBadStateException(String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation()));
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176 }
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177 revToExtract = dataFile.getRevisionIndex(toExtract);
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178 } else if (revision != null) {
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179 revToExtract = dataFile.getRevisionIndex(revision);
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180 } else {
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181 revToExtract = revisionIndex;
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182 }
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183 ByteChannel sinkWrap;
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184 if (getCancelSupport(null, false) == null) {
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185 // no command-specific cancel helper, no need for extra proxy
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186 // sink itself still may supply CS
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187 sinkWrap = sink;
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188 } else {
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189 // try CS from sink, if any. at least there is CS from command
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190 CancelSupport cancelHelper = getCancelSupport(sink, true);
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191 cancelHelper.checkCancelled();
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192 sinkWrap = new ByteChannelProxy(sink, cancelHelper);
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193 }
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194 dataFile.contentWithFilters(revToExtract, sinkWrap);
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195 }
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196
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197 private static class ByteChannelProxy implements ByteChannel, Adaptable {
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198 private final ByteChannel delegate;
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199 private final CancelSupport cancelHelper;
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200
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201 public ByteChannelProxy(ByteChannel _delegate, CancelSupport cs) {
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202 assert _delegate != null;
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203 delegate = _delegate;
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204 cancelHelper = cs;
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205 }
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206 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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207 return delegate.write(buffer);
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208 }
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209
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210 public <T> T getAdapter(Class<T> adapterClass) {
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211 if (CancelSupport.class == adapterClass) {
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212 return adapterClass.cast(cancelHelper);
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213 }
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214 return Adaptable.Factory.getAdapter(delegate, adapterClass, null);
322
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215 }
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216 }
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217 }