1 /*
2 * Scope: a generic MVC framework.
3 * Copyright (c) 2000-2002, The Scope team
4 * All rights reserved.
5 *
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * Neither the name "Scope" nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
27 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 *
36 * $Id: BeanInfos.java,v 1.7 2002/09/05 15:41:45 ludovicc Exp $
37 */
38 package org.scopemvc.model.beans;
39
40
41 import java.beans.BeanInfo;
42 import java.beans.IntrospectionException;
43 import java.beans.Introspector;
44 import java.beans.PropertyDescriptor;
45 import java.util.HashMap;
46 import org.apache.commons.logging.Log;
47 import org.apache.commons.logging.LogFactory;
48 import org.scopemvc.util.Debug;
49
50 /***
51 * <P>
52 *
53 * Internal class used by the Beans ModelManagers to access BeanInfo for model
54 * objects. </P>
55 *
56 * @author <A HREF="mailto:smeyfroi@users.sourceforge.net">Steve Meyfroidt</A>
57 * @created 05 September 2002
58 * @version $Revision: 1.7 $ $Date: 2002/09/05 15:41:45 $
59 */
60 final class BeanInfos {
61
62 private final static Log LOG = LogFactory.getLog(BeanInfos.class);
63
64 private static HashMap beanInfos = new HashMap();
65 private static HashMap propertyDescriptors = new HashMap();
66
67
68 /***
69 * Gets the bean info
70 *
71 * @param inModelClass TODO: Describe the Parameter
72 * @return The beanInfo value
73 */
74 static BeanInfo getBeanInfo(Class inModelClass) {
75 // Got it cached? Note that Introspector maintains a cache but
76 // ... it returns a copy of cached BeanInfos. Since Scope treats
77 // ... the BeanInfo as immutable we may as well cache BeanInfo
78 // ... here to avoid the BeanInfo copy.
79 BeanInfo result = (BeanInfo) beanInfos.get(inModelClass);
80 if (result == null) {
81 // Not in cache so get one in standard JavaBeans way
82 try {
83 result = Introspector.getBeanInfo(inModelClass, Object.class);
84 if (Debug.ON) {
85 Debug.assertTrue(result != null);
86 }
87 beanInfos.put(inModelClass, result);
88 cachePropertyDescriptors(inModelClass, result);
89 } catch (IntrospectionException e) {
90 LOG.fatal("Can't find BeanInfo for: " + inModelClass, e);
91 if (Debug.ON) {
92 Debug.assertTrue(1 == 0, e.toString());
93 }
94 }
95 }
96 return result;
97 }
98
99
100 /***
101 * Gets the property descriptor
102 *
103 * @param inModelClass TODO: Describe the Parameter
104 * @param inPropertyName TODO: Describe the Parameter
105 * @return The propertyDescriptor value
106 */
107 static PropertyDescriptor getPropertyDescriptor(Class inModelClass, String inPropertyName) {
108 if (Debug.ON) {
109 Debug.assertTrue(inPropertyName != null, "null inPropertyName");
110 }
111 Object descriptors = propertyDescriptors.get(inModelClass);
112 if (descriptors == null) {
113 getBeanInfo(inModelClass);
114 descriptors = propertyDescriptors.get(inModelClass);
115 }
116 if (Debug.ON) {
117 Debug.assertTrue(descriptors instanceof HashMap, "descriptors not HashMap: " + descriptors);
118 }
119 return (PropertyDescriptor) ((HashMap) descriptors).get(inPropertyName);
120 }
121
122
123 private static void cachePropertyDescriptors(Class inModelClass, BeanInfo beanInfo) {
124 HashMap descriptors = new HashMap();
125 PropertyDescriptor[] beanDescriptors = beanInfo.getPropertyDescriptors();
126 for (int i = 0; i < beanDescriptors.length; ++i) {
127 PropertyDescriptor desc = beanDescriptors[i];
128 if (Debug.ON) {
129 Debug.assertTrue(desc != null, "null desc");
130 }
131 descriptors.put(desc.getName(), desc);
132 }
133 propertyDescriptors.put(inModelClass, descriptors);
134 }
135 }
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