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annotate src/org/tmatesoft/hg/core/SessionContext.java @ 711:a62079bc422b

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 11 Oct 2013 21:35:41 +0200
parents a483b2b68a2e
children
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1 /*
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2 * Copyright (c) 2011-2013 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.core;
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18
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19 import java.net.URI;
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20
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21 import org.tmatesoft.hg.auth.HgAuthenticator;
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22 import org.tmatesoft.hg.internal.BasicSessionContext;
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23 import org.tmatesoft.hg.internal.Experimental;
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24 import org.tmatesoft.hg.internal.remote.BasicAuthenticator;
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25 import org.tmatesoft.hg.internal.remote.RemoteConnectorDescriptor;
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26 import org.tmatesoft.hg.repo.HgRemoteRepository;
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27 import org.tmatesoft.hg.util.LogFacility;
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28 import org.tmatesoft.hg.util.Path;
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30 /**
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31 * Access to objects that might need to be shared between various distinct operations ran during the same working session
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32 * (i.e. caches, log, etc.). It's unspecified whether session context is per repository or can span multiple repositories
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33 *
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34 * <p>Note, API is likely to be extended in future versions, adding more object to share.
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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 abstract class SessionContext {
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40 // abstract class to facilitate adding more functionality without API break
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41
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42 /**
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43 * Access wrapper for a system log facility.
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44 * @return facility to direct dumps to, never <code>null</code>
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45 */
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46 public abstract LogFacility getLog();
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47
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48 /**
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49 * Access configuration parameters of the session.
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50 * @param name name of the session configuration parameter
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51 * @param defaultValue value to return if parameter is not configured
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52 * @return value of the session parameter, defaultValue if none found
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53 */
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54 public abstract Object getConfigurationProperty(String name, Object defaultValue);
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55 // perhaps, later may add Configuration object, with PropertyMarshal's helpers
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56 // e.g. when there's standalone Caches and WritableSessionProperties objects
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58 /**
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59 * Provide a factory to create {@link Path} objects.
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60 *
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61 * Occasionally, there's a need to construct a {@link Path} object from a string/byte data
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62 * kept in mercurial control files. Generally, default implementation (with {@link Path#create(CharSequence)}
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63 * is enough, however, if there's a need to control number of string objects in memory (i.e. prevent duplicates),
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64 * default implementation might need to be replaced with more sophisticated (e.g. using weak references or
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65 * just a huge hash set).
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66 *
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67 * @return factory to construct Path objects, never <code>null</code>
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68 */
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69 public Path.Source getPathFactory() {
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70 return new Path.Source() {
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71 public Path path(CharSequence p) {
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72 return Path.create(p);
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73 }
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74 };
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75 }
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76
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77 /**
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78 * Work in progress, provisional API.
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79 *
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80 * Provides descriptor that knows how to handle connections of specific kind
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81 *
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82 * FIXME Perhaps, implementation here shall return null for any URI, while the one
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83 * in {@link BasicSessionContext} shall use our internal classes? However,
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84 * present implementation provides support for uris handled in the library itself, and likely
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85 * most clients need this, even if they supply own SessionContext
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86 *
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87 * @return <code>null</code> if supplied URI doesn't point to a remote repository or repositories of that kind are not supported
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88 */
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89 @Experimental(reason="Provisional API. Work in progress")
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90 public HgRemoteRepository.RemoteDescriptor getRemoteDescriptor(URI uri) {
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91 return new RemoteConnectorDescriptor.Provider().get(this, uri);
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92 }
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93
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94 /**
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95 * Facility to perform authentication for a given remote connection
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96 * @return never <code>null</code>
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97 */
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98 @Experimental(reason="Provisional API. Work in progress")
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99 public HgAuthenticator getAuthenticator(HgRemoteRepository.RemoteDescriptor rd) {
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100 return new BasicAuthenticator(getLog());
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101 }
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103 /**
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104 * Providers of the context may implement
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105 */
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106 public interface Source {
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107 SessionContext getSessionContext();
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108 }
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109
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110 public static final class SourcePrim implements Source {
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111 private final SessionContext ctx;
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112
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
diff changeset
113 public SourcePrim(SessionContext sessionContext) {
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
diff changeset
114 assert sessionContext != null;
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
diff changeset
115 ctx = sessionContext;
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
diff changeset
116 }
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
diff changeset
117 public SessionContext getSessionContext() {
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
diff changeset
118 return ctx;
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
diff changeset
119 }
fba85bc1dfb8 Refactoring: move all encoding/decoding operations into single place, EncodingHelper
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 571
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120 }
295
981f9f50bb6c Issue 11: Error log facility. SessionContext to share common facilities
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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121 }