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annotate src/org/tmatesoft/hg/core/HgCatCommand.java @ 338:3cfa4d908fc9

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Add options to control DataAccessProvider, allow to turn off use of file memory mapping in particular to solve potential sharing violation (os file handle gets released on MappedByteByffer being GC'd, not on FileChannel.close())
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 15 Nov 2011 04:47:03 +0100
parents d68dcb3b5f49
children 5f9073eabf06
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 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 }