2 Copyright (C) 2003, 2006 Free Software Foundation, Inc.
4 This file is a part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or (at
9 your option) any later version.
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
39 package gnu
.javax
.crypto
.sasl
;
41 import gnu
.java
.security
.Registry
;
43 import java
.util
.ArrayList
;
44 import java
.util
.Iterator
;
45 import java
.util
.StringTokenizer
;
48 * A static class for creating {@link IAuthInfoProvider} providers. It
49 * transparently locates and uses any provider instances, based on the value
50 * assigned to the System property with the key
51 * <code>gnu.crypto.sasl.auth.info.provider.pkgs</code>. If more than one is
52 * specified they SHOULD be separated with a vertical bar character. Please note
53 * that the GNU provider is always added last to the list, disregarding whether
54 * it was mentioned or not in the value of that property, or if it that property
60 // Constants and variables
61 // -------------------------------------------------------------------------
63 private static final ArrayList factories
= new ArrayList();
66 IAuthInfoProviderFactory ours
= new AuthInfoProviderFactory();
67 // if SASL_AUTH_INFO_PROVIDER_PKGS is defined then parse it
69 String pkgs
= System
.getProperty(Registry
.SASL_AUTH_INFO_PROVIDER_PKGS
,
73 for (StringTokenizer st
= new StringTokenizer(pkgs
, "|"); st
.hasMoreTokens();)
75 clazz
= st
.nextToken();
76 if (!"gnu.crypto.sasl".equals(clazz
))
78 clazz
+= ".AuthInfoProviderFactory";
81 IAuthInfoProviderFactory factory
= (IAuthInfoProviderFactory
) Class
.forName(
83 factories
.add(factory
);
85 catch (ClassCastException ignored
)
88 catch (ClassNotFoundException ignored
)
91 catch (InstantiationException ignored
)
94 catch (IllegalAccessException ignored
)
100 // always add ours last; unless it's already there
101 if (!factories
.contains(ours
))
108 // -------------------------------------------------------------------------
110 /** Trivial constructor to enforce Singleton pattern. */
117 // -------------------------------------------------------------------------
120 * A convenience method to return the authentication information provider
121 * for a designated SASL mechnanism. It goes through all the installed
122 * provider factories, one at a time, and attempts to return a new instance
123 * of the provider for the designated mechanism. It stops at the first
124 * factory returning a non-null provider.
126 * @param mechanism the name of a SASL mechanism.
127 * @return an implementation that provides {@link IAuthInfoProvider} for that
128 * mechanism; or <code>null</code> if none found.
130 public static IAuthInfoProvider
getProvider(String mechanism
)
132 for (Iterator it
= factories
.iterator(); it
.hasNext();)
134 IAuthInfoProviderFactory factory
= (IAuthInfoProviderFactory
) it
.next();
135 IAuthInfoProvider result
= factory
.getInstance(mechanism
);