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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
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12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
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17  * You should have received a copy of the GNU General Public License version
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25 
26 package com.sun.java.accessibility.util;
27 
28 import java.awt.*;
29 import java.util.EventListener;
30 import javax.accessibility.*;
31 
32 
33 /**
34  * The GUIInitializedMulticaster class is used to maintain a list of
35  * GUIInitializedListener classes.  It is intended to be used primarily
36  * for internal support in the EventQueueMonitor class, and is not intended
37  * to be used by classes outside the Java Accessibility Utility package.
38  *
39  * @see EventQueueMonitor
40  * @see EventQueueMonitor#addGUIInitializedListener
41  * @see EventQueueMonitor#removeGUIInitializedListener
42  *
43  */
44 class GUIInitializedMulticaster
45     extends AWTEventMulticaster implements GUIInitializedListener
46 {
GUIInitializedMulticaster(EventListener a, EventListener b)47     protected GUIInitializedMulticaster(EventListener a, EventListener b) {
48         super(a, b);
49     }
50 
guiInitialized()51     public void guiInitialized() {
52         ((GUIInitializedListener)a).guiInitialized();
53         ((GUIInitializedListener)b).guiInitialized();
54     }
55 
add(GUIInitializedListener a, GUIInitializedListener b)56     public static GUIInitializedListener add(GUIInitializedListener a, GUIInitializedListener b) {
57         return (GUIInitializedListener)addInternal(a, b);
58     }
59 
remove(GUIInitializedListener l, GUIInitializedListener oldl)60     public static GUIInitializedListener remove(GUIInitializedListener l, GUIInitializedListener oldl) {
61         return (GUIInitializedListener)removeInternal(l, oldl);
62     }
63 
addInternal(EventListener a, EventListener b)64     protected static EventListener addInternal(EventListener a, EventListener b) {
65         if (a == null)  return b;
66         if (b == null)  return a;
67         return new GUIInitializedMulticaster(a, b);
68     }
69 
removeInternal(EventListener l, EventListener oldl)70     protected static EventListener removeInternal(EventListener l, EventListener oldl) {
71         if (l == oldl || l == null) {
72             return null;
73         } else if (l instanceof GUIInitializedMulticaster) {
74             return ((GUIInitializedMulticaster)l).remove(oldl);
75         } else {
76             return l;           // it's not here
77         }
78     }
79 
80 }
81