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1   /*
2    * $Id: ELMessagesNotPresentTagBeanInfo.java 376780 2006-02-10 18:09:22Z husted $
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  package org.apache.strutsel.taglib.logic;
19  
20  import java.beans.IntrospectionException;
21  import java.beans.PropertyDescriptor;
22  import java.beans.SimpleBeanInfo;
23  
24  import java.util.ArrayList;
25  
26  /***
27   * This is the <code>BeanInfo</code> descriptor for the
28   * <code>org.apache.strutsel.taglib.logic.ELMessagesNotPresentTag</code>
29   * class.  It is needed to override the default mapping of custom tag
30   * attribute names to class attribute names. <p> This is because the value of
31   * the unevaluated EL expression has to be kept separately from the evaluated
32   * value, which is stored in the base class. This is related to the fact that
33   * the JSP compiler can choose to reuse different tag instances if they
34   * received the same original attribute values, and the JSP compiler can
35   * choose to not re-call the setter methods, because it can assume the same
36   * values are already set.
37   */
38  public class ELMessagesNotPresentTagBeanInfo extends SimpleBeanInfo {
39      public PropertyDescriptor[] getPropertyDescriptors() {
40          ArrayList proplist = new ArrayList();
41  
42          try {
43              proplist.add(new PropertyDescriptor("name",
44                      ELMessagesNotPresentTag.class, null, "setNameExpr"));
45          } catch (IntrospectionException ex) {
46          }
47  
48          try {
49              proplist.add(new PropertyDescriptor("property",
50                      ELMessagesNotPresentTag.class, null, "setPropertyExpr"));
51          } catch (IntrospectionException ex) {
52          }
53  
54          try {
55              proplist.add(new PropertyDescriptor("message",
56                      ELMessagesNotPresentTag.class, null, "setMessageExpr"));
57          } catch (IntrospectionException ex) {
58          }
59  
60          PropertyDescriptor[] result = new PropertyDescriptor[proplist.size()];
61  
62          return ((PropertyDescriptor[]) proplist.toArray(result));
63      }
64  }