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annotate src/org/tmatesoft/hg/core/HgFileInformer.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 981f9f50bb6c
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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19 import org.tmatesoft.hg.internal.ManifestRevision;
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20 import org.tmatesoft.hg.repo.HgDataFile;
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21 import org.tmatesoft.hg.repo.HgInternals;
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22 import org.tmatesoft.hg.repo.HgRepository;
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23 import org.tmatesoft.hg.util.Path;
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25 /**
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26 * Primary purpose is to provide information about file revisions at specific changeset. Multiple {@link #check(Path)} calls
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27 * are possible once {@link #changeset(Nodeid)} (and optionally, {@link #followRenames(boolean)}) were set.
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28 *
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29 * <p>Sample:
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30 * <pre><code>
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31 * HgFileInformer i = new HgFileInformer(hgRepo).changeset(Nodeid.fromString("<40 digits>")).followRenames(true);
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32 * if (i.check(file)) {
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33 * HgCatCommand catCmd = new HgCatCommand(hgRepo).revision(i.getFileRevision());
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34 * catCmd.execute(...);
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35 * ...
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36 * }
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37 * </pre></code>
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38 *
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39 * @author Artem Tikhomirov
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40 * @author TMate Software Ltd.
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41 */
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42 public class HgFileInformer {
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43
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44 private final HgRepository repo;
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45 private boolean followRenames;
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46 private Nodeid cset;
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47 private ManifestRevision cachedManifest;
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48 private HgFileRevision fileRevision;
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49 private boolean checked, renamed;
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51 public HgFileInformer(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 * Select specific changelog revision
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57 *
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58 * @param nid changeset identifier
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59 * @return <code>this</code> for convenience
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60 */
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61 public HgFileInformer changeset(Nodeid nid) {
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62 if (nid == null || nid.isNull()) {
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63 throw new IllegalArgumentException();
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64 }
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65 cset = nid;
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66 cachedManifest = null;
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67 fileRevision = null;
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68 return this;
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69 }
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70
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71 /**
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72 * Whether to check file origins, default is false (look up only the name supplied)
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73 *
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74 * @param follow <code>true</code> to check copy/rename origin of the file if it is a copy.
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75 * @return <code>this</code> for convenience
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76 */
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77 public HgFileInformer followRenames(boolean follow) {
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78 followRenames = follow;
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79 fileRevision = null;
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80 return this;
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81 }
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82
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83 /**
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84 * Find file (or its origin, if {@link #followRenames(boolean)} was set to <code>true</code>) among files known at specified {@link #changeset(Nodeid)}.
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85 *
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86 * @param file name of the file in question
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87 * @return <code>true</code> if file is known at the selected changeset.
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88 * @throws IllegalArgumentException if {@link #changeset(Nodeid)} not specified or file argument is bad.
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89 */
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90 public boolean check(Path file) { // XXX IStatus instead of boolean?
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91 fileRevision = null;
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92 checked = false;
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93 renamed = false;
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94 if (cset == null || file == null || file.isDirectory()) {
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95 throw new IllegalArgumentException();
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96 }
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97 HgDataFile dataFile = repo.getFileNode(file);
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98 if (!dataFile.exists()) {
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99 return false;
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100 }
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101 if (cachedManifest == null) {
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102 int csetRev = repo.getChangelog().getLocalRevision(cset);
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103 cachedManifest = new ManifestRevision(null, null); // XXX how about context and cached manifest revisions
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104 repo.getManifest().walk(csetRev, csetRev, cachedManifest);
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105 // cachedManifest shall be meaningful - changelog.getLocalRevision above ensures we've got version that exists.
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106 }
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107 Nodeid toExtract = cachedManifest.nodeid(file);
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108 try {
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109 if (toExtract == null && followRenames) {
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110 while (toExtract == null && dataFile.isCopy()) {
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111 renamed = true;
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112 file = dataFile.getCopySourceName();
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113 dataFile = repo.getFileNode(file);
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114 toExtract = cachedManifest.nodeid(file);
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115 }
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116 }
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117 } catch (HgDataStreamException ex) {
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118 HgInternals.getContext(repo).getLog().warn(getClass(), ex, "Follow copy/rename failed");
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119 // ignore now, however if there's IStatus retval, might report error with reasonable explanation.
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120 // Perhaps, may add a String reason() method with such info?
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121 }
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122 checked = true;
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123 if (toExtract != null) {
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124 fileRevision = new HgFileRevision(repo, toExtract, dataFile.getPath());
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125 return true;
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126 } // else String.format("File %s nor its origins were not known at repository %s revision", file, cset.shortNotation())
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127 return false;
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128 }
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129
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130 /**
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131 * @return result of the last {@link #check(Path)} call.
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132 */
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133 public boolean exists() {
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134 assertCheckRan();
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135 return fileRevision != null;
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136 }
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137
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138 /**
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139 * @return <code>true</code> if checked file was known by another name at the time of specified changeset.
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140 */
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141 public boolean hasAnotherName() {
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142 assertCheckRan();
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143 return renamed;
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144 }
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145
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146 /**
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147 * @return holder for file revision information
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148 */
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149 public HgFileRevision getFileRevision() {
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150 assertCheckRan();
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151 return fileRevision;
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152 }
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153
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154 /**
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155 * Name of the checked file as it was known at the time of the specified changeset.
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156 *
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157 * @return handy shortcut for <code>getFileRevision().getPath()</code>
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158 */
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159 public Path filename() {
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160 assertCheckRan();
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161 return fileRevision.getPath();
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162 }
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163
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164 /**
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165 * Revision of the checked file
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166 *
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167 * @return handy shortcut for <code>getFileRevision().getRevision()</code>
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168 */
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169 public Nodeid revision() {
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170 assertCheckRan();
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171 return fileRevision.getRevision();
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172 }
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173
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174 private void assertCheckRan() {
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175 if (!checked) {
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176 throw new HgBadStateException("Shall invoke #check(Path) first");
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177 }
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178 }
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179 }