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1   /*
2    * $Id: ELMessagesNotPresentTagBeanInfo.java 471754 2006-11-06 14:55:09Z husted $
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *  http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  package org.apache.strutsel.taglib.logic;
22  
23  import java.beans.IntrospectionException;
24  import java.beans.PropertyDescriptor;
25  import java.beans.SimpleBeanInfo;
26  
27  import java.util.ArrayList;
28  
29  /**
30   * This is the <code>BeanInfo</code> descriptor for the
31   * <code>org.apache.strutsel.taglib.logic.ELMessagesNotPresentTag</code>
32   * class.  It is needed to override the default mapping of custom tag
33   * attribute names to class attribute names. <p> This is because the value of
34   * the unevaluated EL expression has to be kept separately from the evaluated
35   * value, which is stored in the base class. This is related to the fact that
36   * the JSP compiler can choose to reuse different tag instances if they
37   * received the same original attribute values, and the JSP compiler can
38   * choose to not re-call the setter methods, because it can assume the same
39   * values are already set.
40   */
41  public class ELMessagesNotPresentTagBeanInfo extends SimpleBeanInfo {
42      public PropertyDescriptor[] getPropertyDescriptors() {
43          ArrayList proplist = new ArrayList();
44  
45          try {
46              proplist.add(new PropertyDescriptor("name",
47                      ELMessagesNotPresentTag.class, null, "setNameExpr"));
48          } catch (IntrospectionException ex) {
49          }
50  
51          try {
52              proplist.add(new PropertyDescriptor("property",
53                      ELMessagesNotPresentTag.class, null, "setPropertyExpr"));
54          } catch (IntrospectionException ex) {
55          }
56  
57          try {
58              proplist.add(new PropertyDescriptor("message",
59                      ELMessagesNotPresentTag.class, null, "setMessageExpr"));
60          } catch (IntrospectionException ex) {
61          }
62  
63          PropertyDescriptor[] result = new PropertyDescriptor[proplist.size()];
64  
65          return ((PropertyDescriptor[]) proplist.toArray(result));
66      }
67  }