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annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 322:d68dcb3b5f49

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Propagate command's CancelSupport to low-level API. CancelSupport from context got priority over one from command
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Sep 2011 08:00:04 +0200
parents 3fbfce107f94
children 5f9073eabf06
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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 import java.nio.ByteBuffer;
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26
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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.util.Adaptable;
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30 import org.tmatesoft.hg.util.ByteChannel;
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31 import org.tmatesoft.hg.util.CancelSupport;
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32 import org.tmatesoft.hg.util.CancelledException;
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33 import org.tmatesoft.hg.util.Path;
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34
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35 /**
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36 * Command to obtain content of a file, 'hg cat' counterpart.
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 public class HgCatCommand extends HgAbstractCommand<HgCatCommand> {
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42
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43 private final HgRepository repo;
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44 private Path file;
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45 private int localRevision = TIP;
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46 private Nodeid revision;
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47 private Nodeid cset;
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48
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49 public HgCatCommand(HgRepository hgRepo) {
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50 repo = hgRepo;
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51 }
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52
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53 /**
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54 * File to read, required parameter
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55 * @param fname path to a repository file, can't be <code>null</code>
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56 * @return <code>this</code> for convenience
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57 * @throws IllegalArgumentException if supplied fname is null or points to directory
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58 */
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59 public HgCatCommand file(Path fname) {
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60 if (fname == null || fname.isDirectory()) {
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61 throw new IllegalArgumentException(String.valueOf(fname));
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62 }
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63 file = fname;
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64 return this;
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65 }
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66
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67 /**
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68 * Select specific local revision of the file to cat. Note, revision numbering is of particular file, not that of
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69 * repository (i.e. revision 0 means initial content of the file, irrespective of changeset revision at the time of commit)
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70 *
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71 * Invocation of this method clears revision set with {@link #revision(Nodeid)} or {@link #revision(int)} earlier.
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72 *
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73 * XXX rev can't be WORKING_COPY (if allowed, need to implement in #execute())
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74 * @param rev local revision number, non-negative, or one of predefined constants. Note, use of {@link HgRepository#BAD_REVISION},
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75 * although possible, makes little sense (command would fail if executed).
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76 * @return <code>this</code> for convenience
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77 */
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78 public HgCatCommand revision(int rev) {
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79 if (wrongLocalRevision(rev)) {
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80 throw new IllegalArgumentException(String.valueOf(rev));
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81 }
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82 localRevision = rev;
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83 revision = null;
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84 cset = null;
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85 return this;
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86 }
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87
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88 /**
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89 * Select revision to read. Note, this revision is file revision (i.e. the one from manifest), not the changeset revision.
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90 *
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91 * Invocation of this method clears revision set with {@link #revision(int)} or {@link #revision(Nodeid)} earlier.
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92 *
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93 * @param nodeid - unique file revision identifier, Note, use of <code>null</code> or {@link Nodeid#NULL} is senseless
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94 * @return <code>this</code> for convenience
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95 */
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96 public HgCatCommand revision(Nodeid nodeid) {
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97 if (nodeid != null && nodeid.isNull()) {
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98 nodeid = null;
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99 }
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100 revision = nodeid;
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101 localRevision = BAD_REVISION;
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102 cset = null;
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103 return this;
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104 }
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105
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106 /**
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107 * Parameterize the command from file revision object.
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108 *
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109 * @param fileRev file revision to cat
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110 * @return <code>this</code> for convenience
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111 */
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112 public HgCatCommand revision(HgFileRevision fileRev) {
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113 return file(fileRev.getPath()).revision(fileRev.getRevision());
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114 }
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115
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116 /**
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117 * 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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118 * operates in terms of repository global revisions (aka changesets).
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119 *
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120 * Invocation of this method clears local file revisions selection.
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121 *
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122 * @param nodeid changeset revision
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123 * @return <code>this</code> for convenience
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124 */
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125 public HgCatCommand changeset(Nodeid nodeid) {
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126 localRevision = BAD_REVISION;
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127 revision = null;
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128 cset = nodeid;
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129 return this;
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130 }
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131
148
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132 /**
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133 * Runs the command with current set of parameters and pipes data to provided sink.
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134 *
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135 * @param sink output channel to write data to.
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136 * @throws HgDataStreamException
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137 * @throws IllegalArgumentException when command arguments are incomplete or wrong
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138 */
237
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139 public void execute(ByteChannel sink) throws HgDataStreamException, CancelledException {
232
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140 if (localRevision == BAD_REVISION && revision == null && cset == null) {
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141 throw new IllegalArgumentException("File revision, corresponing local number, or a changset nodeid shall be specified");
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142 }
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143 if (file == null) {
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144 throw new IllegalArgumentException("Name of the file is missing");
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145 }
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146 if (sink == null) {
148
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147 throw new IllegalArgumentException("Need an output channel");
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148 }
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149 HgDataFile dataFile = repo.getFileNode(file);
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150 if (!dataFile.exists()) {
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151 throw new HgDataStreamException(file, new FileNotFoundException(file.toString()));
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152 }
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153 int revToExtract;
232
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154 if (cset != null) {
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155 int csetRev = repo.getChangelog().getLocalRevision(cset);
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156 Nodeid toExtract = null;
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157 do {
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158 toExtract = repo.getManifest().getFileRevision(csetRev, file);
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159 if (toExtract == null) {
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160 if (dataFile.isCopy()) {
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161 file = dataFile.getCopySourceName();
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162 dataFile = repo.getFileNode(file);
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163 } else {
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164 break;
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165 }
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166 }
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167 } while (toExtract == null);
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168 if (toExtract == null) {
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169 throw new HgBadStateException(String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation()));
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170 }
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171 revToExtract = dataFile.getLocalRevision(toExtract);
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172 } else if (revision != null) {
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173 revToExtract = dataFile.getLocalRevision(revision);
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174 } else {
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175 revToExtract = localRevision;
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176 }
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177 ByteChannel sinkWrap;
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178 if (getCancelSupport(null, false) == null) {
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179 // no command-specific cancel helper, no need for extra proxy
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180 // sink itself still may supply CS
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181 sinkWrap = sink;
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182 } else {
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183 // try CS from sink, if any. at least there is CS from command
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184 CancelSupport cancelHelper = getCancelSupport(sink, true);
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185 cancelHelper.checkCancelled();
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186 sinkWrap = new ByteChannelProxy(sink, cancelHelper);
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187 }
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188 dataFile.contentWithFilters(revToExtract, sinkWrap);
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189 }
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190
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191 private static class ByteChannelProxy implements ByteChannel, Adaptable {
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192 private final ByteChannel delegate;
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193 private final CancelSupport cancelHelper;
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194
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195 public ByteChannelProxy(ByteChannel _delegate, CancelSupport cs) {
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196 assert _delegate != null;
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197 delegate = _delegate;
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198 cancelHelper = cs;
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199 }
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200 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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201 return delegate.write(buffer);
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202 }
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203
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204 public <T> T getAdapter(Class<T> adapterClass) {
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205 if (CancelSupport.class == adapterClass) {
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206 return adapterClass.cast(cancelHelper);
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207 }
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208 if (delegate instanceof Adaptable) {
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209 return ((Adaptable) delegate).getAdapter(adapterClass);
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210 }
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211 if (adapterClass.isInstance(delegate)) {
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212 return adapterClass.cast(delegate);
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213 }
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214 return null;
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215 }
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216 }
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217 }