Source Code Cross Referenced for WindowNotificationRegistrar.java in  » XML-UI » SwingML » org » swingml » event » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML UI » SwingML » org.swingml.event 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.swingml.event;
02:
03:        import java.awt.Window;
04:        import java.util.*;
05:
06:        /**
07:         * TODO: ttolle - Look at the construction here and modify for standards and naming
08:         * @author ttolle - CrossLogic Corporation
09:         */
10:        public class WindowNotificationRegistrar {
11:            // The single instance
12:            private static WindowNotificationRegistrar sole;
13:            // The registered window notification listeners
14:            private List listeners = null;
15:
16:            /**
17:             * Private constructor to protect from arbitrary creation
18:             */
19:            private WindowNotificationRegistrar() {
20:                super ();
21:            }
22:
23:            /**
24:             * Retrieves the only created instance of the registrar
25:             * @return 
26:             */
27:            public static synchronized WindowNotificationRegistrar sole() {
28:                if (sole == null) {
29:                    sole = new WindowNotificationRegistrar();
30:                }
31:                return sole;
32:            }
33:
34:            public synchronized boolean register(
35:                    WindowNotificationListener listener) {
36:                boolean result = false;
37:                if (listener != null) {
38:                    if (listeners == null) {
39:                        listeners = new ArrayList();
40:                    }
41:                    result = listeners.add(listener);
42:                }
43:                return result;
44:            }
45:
46:            public synchronized boolean unregister(
47:                    WindowNotificationListener listener) {
48:                boolean result = false;
49:                if (listener != null) {
50:                    result = listeners.remove(listener);
51:                }
52:                return result;
53:            }
54:
55:            public void windowAdded(Window window) {
56:                if (listeners != null) {
57:                    List clone = new ArrayList(listeners);
58:                    Iterator iterator = clone.iterator();
59:                    while (iterator.hasNext()) {
60:                        ((WindowNotificationListener) iterator.next())
61:                                .windowAdded(window);
62:                    }
63:                }
64:            }
65:
66:            public void windowRemoved(Window window) {
67:                if (listeners != null) {
68:                    List clone = new ArrayList(listeners);
69:                    Iterator iterator = clone.iterator();
70:                    while (iterator.hasNext()) {
71:                        ((WindowNotificationListener) iterator.next())
72:                                .windowRemoved(window);
73:                    }
74:                }
75:            }
76:
77:        }
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