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18 package org.apache.strutsel.taglib.logic;
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.logic.ELMessagesPresentTag</code> class.
29 * It is needed to override the default mapping of custom tag attribute names
30 * to class attribute names. <p> This is because the value of the unevaluated
31 * EL 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 ELMessagesPresentTagBeanInfo extends SimpleBeanInfo {
38 public PropertyDescriptor[] getPropertyDescriptors() {
39 ArrayList proplist = new ArrayList();
40
41 try {
42 proplist.add(new PropertyDescriptor("name",
43 ELMessagesPresentTag.class, null, "setNameExpr"));
44 } catch (IntrospectionException ex) {
45 }
46
47 try {
48 proplist.add(new PropertyDescriptor("property",
49 ELMessagesPresentTag.class, null, "setPropertyExpr"));
50 } catch (IntrospectionException ex) {
51 }
52
53 try {
54 proplist.add(new PropertyDescriptor("message",
55 ELMessagesPresentTag.class, null, "setMessageExpr"));
56 } catch (IntrospectionException ex) {
57 }
58
59 PropertyDescriptor[] result = new PropertyDescriptor[proplist.size()];
60
61 return ((PropertyDescriptor[]) proplist.toArray(result));
62 }
63 }