Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/HgLookup.java @ 505:3cd3c3d37432

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Use checked exception to indicate fs lock entanglements
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 30 Nov 2012 22:08:11 +0100
parents 0bd2d0441d8f
children 2f9ed6bcefa2
rev   line source
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1 /*
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2 * Copyright (c) 2010-2012 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.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.repo.HgRepoConfig.PathsSection;
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32
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33 /**
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34 * Utility methods to find Mercurial repository at a given location
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class HgLookup {
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41 private ConfigFile globalCfg;
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42 private SessionContext sessionContext;
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44 public HgLookup() {
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45 }
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47 public HgLookup(SessionContext ctx) {
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48 sessionContext = ctx;
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49 }
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51 public HgRepository detectFromWorkingDir() throws HgRepositoryNotFoundException {
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52 return detect(System.getProperty("user.dir"));
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53 }
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54
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55 public HgRepository detect(String location) throws HgRepositoryNotFoundException {
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56 return detect(new File(location));
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57 }
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59 // look up in specified location and above
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60 public HgRepository detect(File location) throws HgRepositoryNotFoundException {
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61 File dir = location.getAbsoluteFile();
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62 File repository;
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63 do {
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64 repository = new File(dir, ".hg");
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65 if (repository.exists() && repository.isDirectory()) {
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66 break;
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67 }
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68 repository = null;
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69 dir = dir.getParentFile();
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70
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71 } while(dir != null);
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72 if (repository == null) {
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73 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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74 }
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75 String repoPath = repository.getParentFile().getAbsolutePath();
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76 return new HgRepository(getContext(), repoPath, repository);
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77 }
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78
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79 public HgBundle loadBundle(File location) throws HgRepositoryNotFoundException {
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80 if (location == null || !location.canRead()) {
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81 throw new HgRepositoryNotFoundException(String.format("Can't read file %s", location)).setLocation(String.valueOf(location));
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82 }
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83 return new HgBundle(getContext(), new DataAccessProvider(getContext()), location).link();
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84 }
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86 /**
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87 * Try to instantiate remote server using an immediate url or an url from configuration files
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88 *
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89 * @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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90 * @param hgRepo optional local repository to get default or otherwise configured remote location
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91 * @return an instance featuring access to remote repository, check {@link HgRemoteRepository#isInvalid()} before actually using it
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92 * @throws HgBadArgumentException if anything is wrong with the remote server's URL
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93 */
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94 public HgRemoteRepository detectRemote(String key, HgRepository hgRepo) throws HgBadArgumentException {
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95 URL url;
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96 Exception toReport;
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97 try {
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98 url = new URL(key);
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99 toReport = null;
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100 } catch (MalformedURLException ex) {
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101 url = null;
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102 toReport = ex;
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103 }
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104 if (url == null) {
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105 String server = null;
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106 if (hgRepo != null && !hgRepo.isInvalid()) {
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107 PathsSection ps = hgRepo.getConfiguration().getPaths();
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108 server = key == null || key.trim().isEmpty() ? ps.getDefault() : ps.getString(key, null);
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109 } else if (key == null || key.trim().length() == 0) {
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110 throw new HgBadArgumentException("Can't look up empty key in a global configuration", null);
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111 }
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112 if (server == null) {
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113 server = getGlobalConfig().getSection("paths").get(key);
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114 }
181
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115 if (server == null) {
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116 throw new HgBadArgumentException(String.format("Can't find server %s specification in the config", key), toReport);
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117 }
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118 try {
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119 url = new URL(server);
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120 } catch (MalformedURLException ex) {
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121 throw new HgBadArgumentException(String.format("Found %s server spec in the config, but failed to initialize with it", key), ex);
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122 }
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123 }
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124 return new HgRemoteRepository(getContext(), url);
181
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125 }
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126
295
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127 public HgRemoteRepository detect(URL url) throws HgBadArgumentException {
171
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128 if (url == null) {
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129 throw new IllegalArgumentException();
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130 }
170
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131 if (Boolean.FALSE.booleanValue()) {
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132 throw HgRepository.notImplemented();
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133 }
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134 return new HgRemoteRepository(getContext(), url);
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135 }
181
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136
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137 private ConfigFile getGlobalConfig() {
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138 if (globalCfg == null) {
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139 globalCfg = new ConfigFile(getContext());
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140 try {
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141 globalCfg.addLocation(new File(System.getProperty("user.home"), ".hgrc"));
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142 } catch (HgInvalidFileException ex) {
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143 // XXX perhaps, makes sense to let caller/client know that we've failed to read global config?
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144 getContext().getLog().dump(getClass(), Warn, ex, null);
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145 }
181
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146 }
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147 return globalCfg;
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148 }
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149
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150 private SessionContext getContext() {
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151 if (sessionContext == null) {
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152 sessionContext = new BasicSessionContext(null);
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153 }
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154 return sessionContext;
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155 }
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156 }