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1
33
34 package com.icesoft.faces.facelets;
35
36 import com.sun.facelets.FaceletContext;
37 import com.sun.facelets.tag.TagAttribute;
38 import com.sun.facelets.tag.TagAttributeException;
39 import com.sun.facelets.tag.TagConfig;
40 import com.sun.facelets.tag.TagException;
41 import com.sun.facelets.tag.TagHandler;
42 import com.sun.facelets.tag.jsf.ComponentSupport;
43
44 import javax.el.ELException;
45 import javax.faces.FacesException;
46 import javax.faces.component.UIComponent;
47 import java.io.IOException  ;
48 import java.lang.reflect.Method ;
49
50
54 public class TabChangeListenerHandler extends TagHandler {
55 private static Class panelTabSetClass;
56 private static Class tabChangeListenerClass;
57 private static Method addTabChangeListenerMethod;
58 private static boolean triedGettingICEfacesComponentClasses;
59
60 private static synchronized boolean isICEfacesComponentClassesPresent() {
61 if( !triedGettingICEfacesComponentClasses ) {
62 try {
63 panelTabSetClass = Class.forName(
64 "com.icesoft.faces.component.paneltabset.PanelTabSet");
65 tabChangeListenerClass = Class.forName(
66 "com.icesoft.faces.component.paneltabset.TabChangeListener");
67 addTabChangeListenerMethod = panelTabSetClass.getMethod(
68 "addTabChangeListener", new Class []{tabChangeListenerClass});
69 }
70 catch (Exception e) {
71 }
72 triedGettingICEfacesComponentClasses = true;
73 }
74 return (panelTabSetClass != null &&
75 tabChangeListenerClass != null &&
76 addTabChangeListenerMethod != null);
77 }
78
79
80 private final TagAttribute typeTagAttribute;
81
82
85 public TabChangeListenerHandler(TagConfig config) {
86 super(config);
87
88 typeTagAttribute = getRequiredAttribute("type");
89 }
90
91
95 public void apply(FaceletContext ctx, UIComponent parent)
96 throws IOException , FacesException, ELException {
97 if( !isICEfacesComponentClassesPresent() ) {
98 throw new TagException(
99 tag,
100 "ICEfaces components classes not found, can not use this tag");
101 }
102 if( parent == null ) {
103 throw new TagException(tag, "Parent UIComponent was null");
104 }
105 if( !panelTabSetClass.isAssignableFrom(parent.getClass()) ) {
106 throw new TagException(
107 tag,
108 "Parent UIComponent must be a "+
109 "com.icesoft.faces.component.paneltabset.PanelTabSet");
110 }
111 if( !typeTagAttribute.isLiteral() ) {
112 throw new TagAttributeException(
113 tag, typeTagAttribute,
114 "The class, as given by tabChangeListener tag's type " +
115 "attribute, must be literal, and not a value expression: " +
116 typeTagAttribute.getValue());
117 }
118 String listenerClassName = typeTagAttribute.getValue(ctx);
119 try {
120 Class listenerClass = Class.forName( listenerClassName );
121 if( !tabChangeListenerClass.isAssignableFrom(listenerClass) ) {
122 throw new TagAttributeException(
123 tag, typeTagAttribute,
124 "The class, as given by tabChangeListener tag's type " +
125 "attribute, must implement TabChangeListener: " +
126 listenerClassName);
127 }
128
129 if( ComponentSupport.isNew(parent) ) {
130 Object listenerObject = listenerClass.newInstance();
132 addTabChangeListenerMethod.invoke(
133 parent, new Object []{listenerObject} );
134 }
135 }
136 catch(Exception e) {
137 throw new TagAttributeException(
138 tag, typeTagAttribute,
139 "Could not either find, or instantiate, or add as a " +
140 "listener, the class described by tabChangeListener " +
141 "tag's type attribute: " + listenerClassName, e);
142 }
143
144 }
146 }
147 |
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