1 /**
2 * Redistribution and use of this software and associated documentation ("Software"), with or
3 * without modification, are permitted provided that the following conditions are met:
4 *
5 * 1. Redistributions of source code must retain copyright statements and notices. Redistributions
6 * must also contain a copy of this document.
7 *
8 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
9 * conditions and the following disclaimer in the documentation and/or other materials provided with
10 * the distribution.
11 *
12 * 3. The name "Exolab" must not be used to endorse or promote products derived from this Software
13 * without prior written permission of Intalio, Inc. For written permission, please contact
14 * info@exolab.org.
15 *
16 * 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
17 * their names without prior written permission of Intalio, Inc. Exolab is a registered trademark of
18 * Intalio, Inc.
19 *
20 * 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
21 *
22 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
24 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTALIO, INC. OR ITS
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
29 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * Copyright 2002 (C) Intalio, Inc. All Rights Reserved.
32 *
33 * $Id$
34 */
35
36
37 package org.exolab.castor.mapping.handlers;
38
39
40 import org.exolab.castor.mapping.MapHandler;
41
42 /**
43 * A Map handler for adding and retreiving key-value pairs from A map. A map handler is instantiated
44 * only once, must be thread safe and not use any synchronization.
45 *
46 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
47 * @version $Revision$ $Date: 2005-03-05 06:42:06 -0700 (Sat, 05 Mar 2005) $
48 */
49 public final class MapHandlers {
50 private static final String J2MAP_CLASSNAME = "java.util.Map";
51
52 private static final String J2MAP_HANDLER_CLASSNAME =
53 "org.exolab.castor.mapping.handlers.J2MapHandler";
54
55 private static final MapHandler HASHTABLE_HANDLER = new J1MapHandler();
56
57 private static MapHandler _anymapHandler;
58
59 private static Class _j2mapClass = null;
60
61 static {
62 if (_j2mapClass == null) {
63 try {
64 ClassLoader loader = MapHandlers.class.getClassLoader();
65 if (loader != null) {
66 _j2mapClass = loader.loadClass(J2MAP_CLASSNAME);
67 } else {
68 _j2mapClass = Class.forName(J2MAP_CLASSNAME);
69 }
70 Class handler = Class.forName(J2MAP_HANDLER_CLASSNAME);
71 _anymapHandler = (MapHandler) handler.newInstance();
72 } catch (ClassNotFoundException cnfe) {
73 // -- Probably JDK 1.1 only
74 } catch (InstantiationException ie) {
75 // -- Probably shouldn't be here, but ignore
76 // -- and only JDK 1.1 will be supported.
77 } catch (IllegalAccessException iae) {
78 // -- Probably shouldn't be here, but ignore
79 // -- and only JDK 1.1 will be supported.
80 }
81 }
82 }
83
84 public static MapHandler getHandler(Object object) {
85 if (object == null)
86 return null;
87 return getHandler(object.getClass());
88 } // -- getHandler
89
90 public static MapHandler getHandler(Class clazz) {
91
92 if (clazz == null)
93 return null;
94
95 if (java.util.Hashtable.class.isAssignableFrom(clazz))
96 return HASHTABLE_HANDLER;
97
98 if (_j2mapClass != null) {
99 if (_j2mapClass.isAssignableFrom(clazz))
100 return _anymapHandler;
101 }
102
103 return null;
104 } // -- getHandler
105
106
107 } // -- MapHandlers
108
109