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1   /*
2    * $Id: ELHtmlTagBeanInfo.java 376779 2006-02-10 18:08:58Z 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.html;
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.html.ELHtmlTag</code> class.  It is needed
29   * to override the default mapping of custom tag attribute names to class
30   * attribute names. <p> This is because the value of the unevaluated EL
31   * expression has to be kept separately from the evaluated value, which is
32   * stored in the base class. This is related to the fact that the JSP compiler
33   * can choose to reuse different tag instances if they received the same
34   * original attribute values, and the JSP compiler can choose to not re-call
35   * the setter methods, because it can assume the same values are already set.
36   */
37  public class ELHtmlTagBeanInfo extends SimpleBeanInfo {
38      public PropertyDescriptor[] getPropertyDescriptors() {
39          ArrayList proplist = new ArrayList();
40  
41          try {
42              proplist.add(new PropertyDescriptor("xhtml", ELHtmlTag.class, null,
43                      "setXhtmlExpr"));
44          } catch (IntrospectionException ex) {
45          }
46  
47          try {
48              proplist.add(new PropertyDescriptor("lang", ELHtmlTag.class, null,
49                      "setLangExpr"));
50          } catch (IntrospectionException ex) {
51          }
52  
53          PropertyDescriptor[] result = new PropertyDescriptor[proplist.size()];
54  
55          return ((PropertyDescriptor[]) proplist.toArray(result));
56      }
57  }