1 /**
2 * Redistribution and use of this software and associated documentation
3 * ("Software"), with or without modification, are permitted provided
4 * that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain copyright
7 * statements and notices. Redistributions must also contain a
8 * copy of this document.
9 *
10 * 2. Redistributions in binary form must reproduce the
11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
15 * 3. The name "Exolab" must not be used to endorse or promote
16 * products derived from this Software without prior written
17 * permission of Intalio, Inc. For written permission,
18 * please contact info@exolab.org.
19 *
20 * 4. Products derived from this Software may not be called "Exolab"
21 * nor may "Exolab" appear in their names without prior written
22 * permission of Intalio, Inc. Exolab is a registered
23 * trademark of Intalio, Inc.
24 *
25 * 5. Due credit should be given to the Exolab Project
26 * (http://www.exolab.org/).
27 *
28 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Copyright 2002 (C) Intalio, Inc. All Rights Reserved.
42 *
43 * $Id$
44 */
45
46
47 package org.exolab.castor.mapping.handlers;
48
49
50 import org.exolab.castor.mapping.MapHandler;
51
52 /**
53 * A Map handler for adding and retreiving key-value pairs from
54 * A map. A map handler is instantiated only once, must be thread
55 * safe and not use any synchronization.
56 *
57 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
58 * @version $Revision$ $Date: 2005-03-05 06:42:06 -0700 (Sat, 05 Mar 2005) $
59 */
60 public final class MapHandlers {
61 private static final String J2MAP_CLASSNAME = "java.util.Map";
62
63 private static final String J2MAP_HANDLER_CLASSNAME
64 = "org.exolab.castor.mapping.handlers.J2MapHandler";
65
66 private static final MapHandler HASHTABLE_HANDLER = new J1MapHandler();
67
68 private static MapHandler _anymapHandler;
69
70 private static Class _j2mapClass = null;
71
72 static {
73 if (_j2mapClass == null) {
74 try {
75 ClassLoader loader = MapHandlers.class.getClassLoader();
76 if (loader != null) {
77 _j2mapClass = loader.loadClass(J2MAP_CLASSNAME);
78 } else {
79 _j2mapClass = Class.forName(J2MAP_CLASSNAME);
80 }
81 Class handler = Class.forName(J2MAP_HANDLER_CLASSNAME);
82 _anymapHandler = (MapHandler) handler.newInstance();
83 } catch (ClassNotFoundException cnfe) {
84 //-- Probably JDK 1.1 only
85 } catch(InstantiationException ie) {
86 //-- Probably shouldn't be here, but ignore
87 //-- and only JDK 1.1 will be supported.
88 } catch(IllegalAccessException iae) {
89 //-- Probably shouldn't be here, but ignore
90 //-- and only JDK 1.1 will be supported.
91 }
92 }
93 }
94
95 public static MapHandler getHandler(Object object) {
96 if (object == null) return null;
97 return getHandler(object.getClass());
98 } //-- getHandler
99
100 public static MapHandler getHandler(Class clazz) {
101
102 if (clazz == null) return null;
103
104 if (java.util.Hashtable.class.isAssignableFrom(clazz))
105 return HASHTABLE_HANDLER;
106
107 if (_j2mapClass != null) {
108 if (_j2mapClass.isAssignableFrom(clazz))
109 return _anymapHandler;
110 }
111
112 return null;
113 } //-- getHandler
114
115
116 } //-- MapHandlers
117
118
119