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annotate src/org/tmatesoft/hg/repo/HgLookup.java @ 277:74e7493a042a

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Favor delegation over generalization
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 29 Aug 2011 23:14:59 +0200
parents 41a778e3fd31
children 981f9f50bb6c
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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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.HgException;
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26 import org.tmatesoft.hg.internal.ConfigFile;
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27 import org.tmatesoft.hg.internal.DataAccessProvider;
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28 import org.tmatesoft.hg.internal.Internals;
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29
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30 /**
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31 * Utility methods to find Mercurial repository at a given location
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 public class HgLookup {
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38 private ConfigFile globalCfg;
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39
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40 public HgRepository detectFromWorkingDir() throws HgException {
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41 return detect(System.getProperty("user.dir"));
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42 }
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43
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44 public HgRepository detect(String location) throws HgException {
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45 return detect(new File(location));
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46 }
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47
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48 // look up in specified location and above
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49 public HgRepository detect(File location) throws HgException {
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50 File dir = location.getAbsoluteFile();
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51 File repository;
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52 do {
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53 repository = new File(dir, ".hg");
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54 if (repository.exists() && repository.isDirectory()) {
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55 break;
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56 }
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57 repository = null;
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58 dir = dir.getParentFile();
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59
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60 } while(dir != null);
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61 if (repository == null) {
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62 // return invalid repository
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63 return new HgRepository(location.getPath());
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64 }
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65 try {
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66 String repoPath = repository.getParentFile().getCanonicalPath();
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67 return new HgRepository(repoPath, repository);
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68 } catch (IOException ex) {
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69 throw new HgException(location.toString(), ex);
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70 }
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71 }
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73 public HgBundle loadBundle(File location) /*XXX perhaps, HgDataStreamException or anything like HgMalformedDataException? Or RuntimeEx is better?*/{
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74 if (location == null || !location.canRead()) {
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75 throw new IllegalArgumentException();
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76 }
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77 return new HgBundle(new DataAccessProvider(), location).link();
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78 }
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80 /**
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81 * Try to instantiate remote server.
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82 * @param key either URL or a key from configuration file that points to remote server
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83 * @param hgRepo <em>NOT USED YET<em> local repository that may have extra config, or default remote location
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84 * @return an instance featuring access to remote repository, check {@link HgRemoteRepository#isInvalid()} before actually using it
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85 * @throws HgBadArgumentException if anything is wrong with the remote server's URL
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86 */
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87 public HgRemoteRepository detectRemote(String key, HgRepository hgRepo) throws HgBadArgumentException {
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88 URL url;
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89 Exception toReport;
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90 try {
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91 url = new URL(key);
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92 toReport = null;
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93 } catch (MalformedURLException ex) {
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94 url = null;
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95 toReport = ex;
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96 }
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97 if (url == null) {
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98 String server = getGlobalConfig().getSection("paths").get(key);
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99 if (server == null) {
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100 throw new HgBadArgumentException(String.format("Can't find server %s specification in the config", key), toReport);
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101 }
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102 try {
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103 url = new URL(server);
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104 } catch (MalformedURLException ex) {
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105 throw new HgBadArgumentException(String.format("Found %s server spec in the config, but failed to initialize with it", key), ex);
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106 }
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107 }
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108 return new HgRemoteRepository(url);
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109 }
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110
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111 public HgRemoteRepository detect(URL url) throws HgException {
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112 if (url == null) {
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113 throw new IllegalArgumentException();
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114 }
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115 if (Boolean.FALSE.booleanValue()) {
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116 throw HgRepository.notImplemented();
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117 }
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118 return new HgRemoteRepository(url);
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119 }
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120
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121 private ConfigFile getGlobalConfig() {
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122 if (globalCfg == null) {
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123 globalCfg = new Internals().newConfigFile();
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124 globalCfg.addLocation(new File(System.getProperty("user.home"), ".hgrc"));
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125 }
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126 return globalCfg;
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127 }
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128 }