JtDecorator


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 Decorator pattern.
11   */
12  
13  public class JtDecorator extends JtObject {
14  
15    private Object   component = null;
16   
17  
18  /**
19    * Specifies the object that is being decorated (extra functionality added).
20    * @param component component
21    */
22  
23    public void setComponent (Object   component) {
24       this.component = component;
25    }
26  
27  
28  /**
29    * Returns the object that is being decorated.
30    */
31  
32    public Object   getComponent () {
33       return (component);
34    }
35  
36    public JtDecorator () {
37    }
38  
39  
40  
41  
42    /**
43      * Process object messages.
44      * <ul>
45      * <li>JtREMOVE - Performs any housekeeping that may be needed before the object is removed.
46      * </ul>
47      */
48  
49    public Object   processMessage (Object   event) {
50  
51     String   msgid = null;
52     JtMessage e = (JtMessage) event;
53     Object   content;
54     Object   data;
55  
56  
57       if (e == null)
58      return null;
59  
60       msgid = (String  ) 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 ("JtREMOVE")) {
70         return (super.processMessage (null));     
71       }
72  
73  
74       handleError ("JtDecortator.processMessage: invalid message id:" + msgid);
75       return (null);
76  
77    }
78  
79   
80    /**
81     * Unit tests the messages processed by JtDecorator.
82     */
83  
84    public static void main(String  [] args) {
85  
86      JtFactory factory = new JtFactory ();
87  
88      JtDecorator decorator;
89   
90      //main.setObjTrace (1);
91      //main.setLogFile ("log.txt");
92  
93  
94      // Create JtDecorator
95  
96      decorator = (JtDecorator) factory.createObject ("Jt.JtDecorator", "decorator");
97  
98      System.out.println (decorator);
99  
100     factory.removeObject ("decorator");
101 
102 
103   }
104 
105 }
106 
107 
108
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