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Java > Open Source Codes > org > apache > strutsel > taglib > logic > ELMessagesPresentTagBeanInfo


1 /*
2  * $Id: ELMessagesPresentTagBeanInfo.java 54933 2004-10-16 17:04:52Z germuska $
3  *
4  * Copyright 1999-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19 package org.apache.strutsel.taglib.logic;
20
21 import java.beans.IntrospectionException JavaDoc;
22 import java.beans.PropertyDescriptor JavaDoc;
23 import java.beans.SimpleBeanInfo JavaDoc;
24 import java.util.ArrayList JavaDoc;
25
26 /**
27  * This is the <code>BeanInfo</code> descriptor for the
28  * <code>org.apache.strutsel.taglib.logic.ELMessagesPresentTag</code> class. It is
29  * needed to override the default mapping of custom tag attribute names to
30  * class attribute names.
31  *<p>
32  * This is because the value of the unevaluated EL expression has to be kept
33  * separately from the evaluated value, which is stored in the base class. This
34  * is related to the fact that the JSP compiler can choose to reuse different
35  * tag instances if they received the same original attribute values, and the
36  * JSP compiler can choose to not re-call the setter methods, because it can
37  * assume the same values are already set.
38  */
39 public class ELMessagesPresentTagBeanInfo extends SimpleBeanInfo JavaDoc
40 {
41     public PropertyDescriptor JavaDoc[] getPropertyDescriptors()
42     {
43         ArrayList JavaDoc proplist = new ArrayList JavaDoc();
44
45         try {
46             proplist.add(new PropertyDescriptor JavaDoc("name", ELMessagesPresentTag.class,
47                                                 null, "setNameExpr"));
48         } catch (IntrospectionException JavaDoc ex) {}
49         try {
50             proplist.add(new PropertyDescriptor JavaDoc("property", ELMessagesPresentTag.class,
51                                                 null, "setPropertyExpr"));
52         } catch (IntrospectionException JavaDoc ex) {}
53         try {
54             proplist.add(new PropertyDescriptor JavaDoc("message", ELMessagesPresentTag.class,
55                                                 null, "setMessageExpr"));
56         } catch (IntrospectionException JavaDoc ex) {}
57         
58         PropertyDescriptor JavaDoc[] result =
59             new PropertyDescriptor JavaDoc[proplist.size()];
60         return ((PropertyDescriptor JavaDoc[]) proplist.toArray(result));
61     }
62 }
63
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