ELHtmlTagBeanInfo


1   /*
2    * $Id: ELHtmlTagBeanInfo.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.html;
20  
21  import java.beans.PropertyDescriptor  ;
22  import java.beans.IntrospectionException  ;
23  import java.util.ArrayList  ;
24  import java.beans.SimpleBeanInfo  ;
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.
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 ELHtmlTagBeanInfo extends SimpleBeanInfo  
40  {
41      public  PropertyDescriptor  [] getPropertyDescriptors()
42      {
43          ArrayList   proplist = new ArrayList  ();
44  
45          try {
46              proplist.add(new PropertyDescriptor  ("xhtml", ELHtmlTag.class,
47                                                  null, "setXhtmlExpr"));
48          } catch (IntrospectionException   ex) {}
49          try {
50              proplist.add(new PropertyDescriptor  ("lang", ELHtmlTag.class,
51                                                  null, "setLangExpr"));
52          } catch (IntrospectionException   ex) {}
53          try {
54              proplist.add(new PropertyDescriptor  ("locale", ELHtmlTag.class,
55                                                  null, "setLocaleExpr"));
56          } catch (IntrospectionException   ex) {}
57          
58          PropertyDescriptor  [] result =
59              new PropertyDescriptor  [proplist.size()];
60          return ((PropertyDescriptor  []) proplist.toArray(result));
61      }
62  }
63
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