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1   /*
2    * $Id: ELMessagesPresentTagBeanInfo.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.ELMessagesPresentTag</code> class.
32   * It is needed to override the default mapping of custom tag attribute names
33   * to class attribute names. <p> This is because the value of the unevaluated
34   * EL expression has to be kept separately from the evaluated value, which is
35   * stored in the base class. This is related to the fact that the JSP compiler
36   * can choose to reuse different tag instances if they received the same
37   * original attribute values, and the JSP compiler can choose to not re-call
38   * the setter methods, because it can assume the same values are already set.
39   */
40  public class ELMessagesPresentTagBeanInfo extends SimpleBeanInfo {
41      public PropertyDescriptor[] getPropertyDescriptors() {
42          ArrayList proplist = new ArrayList();
43  
44          try {
45              proplist.add(new PropertyDescriptor("name",
46                      ELMessagesPresentTag.class, null, "setNameExpr"));
47          } catch (IntrospectionException ex) {
48          }
49  
50          try {
51              proplist.add(new PropertyDescriptor("property",
52                      ELMessagesPresentTag.class, null, "setPropertyExpr"));
53          } catch (IntrospectionException ex) {
54          }
55  
56          try {
57              proplist.add(new PropertyDescriptor("message",
58                      ELMessagesPresentTag.class, null, "setMessageExpr"));
59          } catch (IntrospectionException ex) {
60          }
61  
62          PropertyDescriptor[] result = new PropertyDescriptor[proplist.size()];
63  
64          return ((PropertyDescriptor[]) proplist.toArray(result));
65      }
66  }