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Java > Open Source Codes > Jt > JtFacade


1
2
3 package Jt;
4 import java.util.*;
5 import java.lang.reflect.*;
6 import java.beans.*;
7 import java.io.*;
8
9 /**
10  * Jt Implementation of the Facade pattern.
11  */
12
13 public class JtFacade extends JtComposite {
14
15
16   public JtFacade () {
17   }
18
19
20   // Test this facade
21
22   private Object JavaDoc test () {
23     JtMessage msg, tmp;
24
25     // Broadcast the JtTEST message to all the subsystems
26 // of the facade
27
28     System.out.println
29      ("Sending a JtTEST message to all the subsystems of the facade ...");
30
31     msg = new JtMessage ("JtBROADCAST");
32
33     tmp = new JtMessage ("JtTEST");
34
35     msg.setMsgContent (tmp);
36
37
38     return (sendMessage (this, msg));
39
40   }
41
42   /**
43     * Process object messages.
44     * <ul>
45     * <li>JtREMOVES - Performs any housekeeping that may be needed before the object is removed.
46     * </ul>
47     */
48
49   public Object JavaDoc processMessage (Object JavaDoc event) {
50
51    String JavaDoc msgid = null;
52    JtMessage e = (JtMessage) event;
53    Object JavaDoc content;
54    Object JavaDoc data;
55
56
57      if (e == null)
58     return null;
59
60      msgid = (String JavaDoc) e.getMsgId ();
61
62      if (msgid == null)
63     return null;
64
65      content = e.getMsgContent();
66      //data = e.getMsgData ();
67
68
69      if (msgid.equals ("JtTEST")) {
70        return (test ());
71      }
72
73      return (super.processMessage (event));
74 /*
75      if (msgid.equals ("JtREMOVE")) {
76        return (null);
77      }
78
79
80      handleError ("JtFacade.processMessage: invalid message id:" + msgid);
81      return (null);
82 */
83
84   }
85
86  
87   /**
88    * Unit tests the messages processed by JtFacade.
89    */
90
91
92   public static void main(String JavaDoc[] args) {
93
94     JtFactory factory = new JtFactory ();
95     JtFacade facade;
96     JtEcho echo1;
97     JtEcho echo2;
98     JtMessage msg;
99
100     // Create an instance of JtFacade
101
102     facade = (JtFacade) factory.createObject ("Jt.JtFacade", "facade");
103
104
105     echo1 = (JtEcho) factory.createObject ("Jt.JtEcho", "echo1");
106     echo2 = (JtEcho) factory.createObject ("Jt.JtEcho", "echo2");
107
108
109     System.out.println ("JtFacade(JtADD_CHILD): adding a subsystem ...");
110
111     msg = new JtMessage ("JtADD_CHILD");
112
113     factory.setValue (msg, "msgContent", echo1);
114     factory.setValue (msg, "msgData", "echo1");
115
116     factory.sendMessage (facade, msg);
117
118
119     System.out.println ("JtFacade(JtADD_CHILD): adding a subsystem ...");
120
121     msg = new JtMessage ("JtADD_CHILD");
122
123     factory.setValue (msg, "msgContent", echo2);
124     factory.setValue (msg, "msgData", "echo2");
125
126     factory.sendMessage (facade, msg);
127
128
129     factory.sendMessage (facade, new JtMessage ("JtTEST"));
130
131     factory.removeObject ("facade");
132
133
134   }
135
136
137 }
138
139
140
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