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annotate src/org/tmatesoft/hg/repo/HgLookup.java @ 318:c3d2233ba842

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Shall propagate errors to clients, not work around them silently
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Sep 2011 03:35:59 +0200
parents 981f9f50bb6c
children dfb8405d996f
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 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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a3a2e5deb320 Updated contact address to support@hg4j.com
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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 java.io.File;
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20 import java.io.IOException;
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21 import java.net.MalformedURLException;
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22 import java.net.URL;
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23
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24 import org.tmatesoft.hg.core.HgBadArgumentException;
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25 import org.tmatesoft.hg.core.HgInvalidFileException;
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26 import org.tmatesoft.hg.core.SessionContext;
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27 import org.tmatesoft.hg.internal.BasicSessionContext;
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28 import org.tmatesoft.hg.internal.ConfigFile;
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29 import org.tmatesoft.hg.internal.DataAccessProvider;
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30
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31 /**
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32 * Utility methods to find Mercurial repository at a given location
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class HgLookup {
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38
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39 private ConfigFile globalCfg;
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40 private SessionContext sessionContext;
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41
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42 public HgLookup() {
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43 }
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44
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45 public HgLookup(SessionContext ctx) {
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46 sessionContext = ctx;
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47 }
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48
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49 public HgRepository detectFromWorkingDir() throws HgInvalidFileException {
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50 return detect(System.getProperty("user.dir"));
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51 }
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52
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53 public HgRepository detect(String location) throws HgInvalidFileException {
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54 return detect(new File(location));
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55 }
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56
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57 // look up in specified location and above
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58 public HgRepository detect(File location) throws HgInvalidFileException {
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59 File dir = location.getAbsoluteFile();
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60 File repository;
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61 do {
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62 repository = new File(dir, ".hg");
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63 if (repository.exists() && repository.isDirectory()) {
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64 break;
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65 }
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66 repository = null;
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67 dir = dir.getParentFile();
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68
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69 } while(dir != null);
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70 if (repository == null) {
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71 // return invalid repository
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72 return new HgRepository(location.getPath());
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73 }
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74 try {
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75 String repoPath = repository.getParentFile().getCanonicalPath();
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76 return new HgRepository(getContext(), repoPath, repository);
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77 } catch (IOException ex) {
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78 throw new HgInvalidFileException(location.toString(), ex, location);
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79 }
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80 }
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81
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82 public HgBundle loadBundle(File location) throws HgInvalidFileException {
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83 if (location == null || !location.canRead()) {
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84 throw new HgInvalidFileException(String.format("Can't read file %s", location == null ? null : location.getPath()), null, location);
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85 }
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86 return new HgBundle(new DataAccessProvider(getContext()), location).link();
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87 }
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89 /**
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90 * Try to instantiate remote server.
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91 * @param key either URL or a key from configuration file that points to remote server
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92 * @param hgRepo <em>NOT USED YET<em> local repository that may have extra config, or default remote location
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93 * @return an instance featuring access to remote repository, check {@link HgRemoteRepository#isInvalid()} before actually using it
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94 * @throws HgBadArgumentException if anything is wrong with the remote server's URL
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95 */
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96 public HgRemoteRepository detectRemote(String key, HgRepository hgRepo) throws HgBadArgumentException {
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97 URL url;
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98 Exception toReport;
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99 try {
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100 url = new URL(key);
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101 toReport = null;
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102 } catch (MalformedURLException ex) {
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103 url = null;
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104 toReport = ex;
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105 }
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106 if (url == null) {
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107 String server = getGlobalConfig().getSection("paths").get(key);
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108 if (server == null) {
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109 throw new HgBadArgumentException(String.format("Can't find server %s specification in the config", key), toReport);
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110 }
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111 try {
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112 url = new URL(server);
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113 } catch (MalformedURLException ex) {
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114 throw new HgBadArgumentException(String.format("Found %s server spec in the config, but failed to initialize with it", key), ex);
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115 }
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116 }
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117 return new HgRemoteRepository(getContext(), url);
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118 }
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119
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120 public HgRemoteRepository detect(URL url) throws HgBadArgumentException {
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121 if (url == null) {
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122 throw new IllegalArgumentException();
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123 }
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124 if (Boolean.FALSE.booleanValue()) {
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125 throw HgRepository.notImplemented();
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126 }
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127 return new HgRemoteRepository(getContext(), url);
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128 }
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129
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130 private ConfigFile getGlobalConfig() {
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131 if (globalCfg == null) {
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132 globalCfg = new ConfigFile();
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133 try {
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134 globalCfg.addLocation(new File(System.getProperty("user.home"), ".hgrc"));
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135 } catch (IOException ex) {
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136 // XXX perhaps, makes sense to let caller/client know that we've failed to read global config?
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137 getContext().getLog().warn(getClass(), ex, null);
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138 }
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139 }
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140 return globalCfg;
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141 }
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142
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143 private SessionContext getContext() {
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144 if (sessionContext == null) {
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145 sessionContext = new BasicSessionContext(null, null);
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146 }
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147 return sessionContext;
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148 }
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149 }