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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 }