Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/HgLookup.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents f97e81d13190
children 7c0d2ce340b8
rev   line source
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1 /*
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2 * Copyright (c) 2010-2013 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.repo;
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18
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19 import static org.tmatesoft.hg.util.LogFacility.Severity.Warn;
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20
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21 import java.io.File;
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22 import java.net.MalformedURLException;
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23 import java.net.URL;
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25 import org.tmatesoft.hg.core.HgBadArgumentException;
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26 import org.tmatesoft.hg.core.HgRepositoryNotFoundException;
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27 import org.tmatesoft.hg.core.SessionContext;
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28 import org.tmatesoft.hg.internal.BasicSessionContext;
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29 import org.tmatesoft.hg.internal.ConfigFile;
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30 import org.tmatesoft.hg.internal.DataAccessProvider;
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31 import org.tmatesoft.hg.internal.Internals;
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32 import org.tmatesoft.hg.internal.RequiresFile;
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33 import org.tmatesoft.hg.repo.HgRepoConfig.PathsSection;
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34
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35 /**
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36 * Utility methods to find Mercurial repository at a given location
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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 HgLookup {
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42
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43 private ConfigFile globalCfg;
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44 private SessionContext sessionContext;
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45
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46 public HgLookup() {
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47 }
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48
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49 public HgLookup(SessionContext ctx) {
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50 sessionContext = ctx;
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51 }
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52
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53 public HgRepository detectFromWorkingDir() throws HgRepositoryNotFoundException {
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54 return detect(System.getProperty("user.dir"));
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55 }
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56
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57 public HgRepository detect(String location) throws HgRepositoryNotFoundException {
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58 return detect(new File(location));
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59 }
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60
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61 /**
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62 * Look up repository in specified location and above
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63 *
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64 * @param location where to look for .hg directory, never <code>null</code>
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65 * @return repository object, never <code>null</code>
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66 * @throws HgRepositoryNotFoundException if no repository found, or repository version is not supported
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67 */
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68 public HgRepository detect(File location) throws HgRepositoryNotFoundException {
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69 File dir = location.getAbsoluteFile();
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70 File repository;
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71 do {
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72 repository = new File(dir, ".hg");
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73 if (repository.exists() && repository.isDirectory()) {
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74 break;
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75 }
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76 repository = null;
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77 dir = dir.getParentFile();
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78
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79 } while(dir != null);
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80 if (repository == null) {
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81 throw new HgRepositoryNotFoundException(String.format("Can't locate .hg/ directory of Mercurial repository in %s nor in parent dirs", location)).setLocation(location.getPath());
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82 }
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83 String repoPath = repository.getParentFile().getAbsolutePath();
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84 HgRepository rv = new HgRepository(getContext(), repoPath, repository);
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85 int requiresFlags = rv.getImplHelper().getRequiresFlags();
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86 if ((requiresFlags & RequiresFile.REVLOGV1) == 0) {
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87 throw new HgRepositoryNotFoundException(String.format("%s: repository version is not supported (Mercurial <0.9?)", repoPath)).setLocation(location.getPath());
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88 }
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89 return rv;
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90 }
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91
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92 public HgBundle loadBundle(File location) throws HgRepositoryNotFoundException {
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93 if (location == null || !location.canRead()) {
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94 throw new HgRepositoryNotFoundException(String.format("Can't read file %s", location)).setLocation(String.valueOf(location));
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95 }
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96 return new HgBundle(getContext(), new DataAccessProvider(getContext()), location).link();
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97 }
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99 /**
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100 * Try to instantiate remote server using an immediate url or an url from configuration files
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101 *
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102 * @param key either URL or a key from configuration file that points to remote server; if <code>null</code> or empty string, default remote location of the supplied repository (if any) is looked up
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103 * @param hgRepo optional local repository to get default or otherwise configured remote location
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104 * @return an instance featuring access to remote repository, check {@link HgRemoteRepository#isInvalid()} before actually using it
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105 * @throws HgBadArgumentException if anything is wrong with the remote server's URL
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106 */
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107 public HgRemoteRepository detectRemote(String key, HgRepository hgRepo) throws HgBadArgumentException {
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108 URL url;
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109 Exception toReport;
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110 try {
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111 url = new URL(key);
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112 toReport = null;
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113 } catch (MalformedURLException ex) {
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114 url = null;
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115 toReport = ex;
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116 }
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117 if (url == null) {
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118 String server = null;
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119 if (hgRepo != null && !hgRepo.isInvalid()) {
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120 PathsSection ps = hgRepo.getConfiguration().getPaths();
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121 server = key == null || key.trim().isEmpty() ? ps.getDefault() : ps.getString(key, null);
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122 } else if (key == null || key.trim().length() == 0) {
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123 throw new HgBadArgumentException("Can't look up empty key in a global configuration", null);
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124 }
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125 if (server == null) {
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126 server = getGlobalConfig().getSection("paths").get(key);
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127 }
181
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128 if (server == null) {
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129 throw new HgBadArgumentException(String.format("Can't find server %s specification in the config", key), toReport);
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130 }
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131 try {
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132 url = new URL(server);
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133 } catch (MalformedURLException ex) {
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134 throw new HgBadArgumentException(String.format("Found %s server spec in the config, but failed to initialize with it", key), ex);
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135 }
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136 }
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137 return new HgRemoteRepository(getContext(), url);
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138 }
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139
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140 public HgRemoteRepository detect(URL url) throws HgBadArgumentException {
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141 if (url == null) {
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142 throw new IllegalArgumentException();
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143 }
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144 if (Boolean.FALSE.booleanValue()) {
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145 throw Internals.notImplemented();
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146 }
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147 return new HgRemoteRepository(getContext(), url);
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148 }
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149
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150 private ConfigFile getGlobalConfig() {
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151 if (globalCfg == null) {
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152 globalCfg = new ConfigFile(getContext());
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153 try {
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154 globalCfg.addLocation(new File(System.getProperty("user.home"), ".hgrc"));
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155 } catch (HgInvalidFileException ex) {
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156 // XXX perhaps, makes sense to let caller/client know that we've failed to read global config?
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157 getContext().getLog().dump(getClass(), Warn, ex, null);
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158 }
181
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159 }
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160 return globalCfg;
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161 }
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162
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163 private SessionContext getContext() {
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164 if (sessionContext == null) {
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165 sessionContext = new BasicSessionContext(null);
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166 }
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167 return sessionContext;
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168 }
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169 }