JtBuilder


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 Builder pattern.
11   */
12  
13  public class JtBuilder extends JtObject {
14  
15    private Object   builder;
16  
17    public JtBuilder () {
18    }
19  
20  /**
21    * Specifies the builder.
22    *
23    * @param builder builder
24    */
25  
26    public void setBuilder (Object   builder) {
27       this.builder = builder; 
28  
29    }
30  
31  /**
32    * Returns the builder.
33    */
34  
35    public Object   getBuilder () {
36       return (builder);
37    }
38  
39  
40  
41    /**
42      * Process object messages by forwarding them to an object (builder) that
43      * takes care of the building functionality. Different representations 
44      * can be created.
45      * <ul>
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 (this);     
71       }
72  
73       if (builder == null) {
74         handleError ("JtBuilder.process: the builder attribute needs to be set");
75         return (null);
76       }
77  
78       // Let the builder process the request
79  
80       return (sendMessage (builder, event));
81  
82  
83    }
84  
85   
86    /**
87     * Unit tests the messages processed by JtBuilder.
88     */
89  
90  
91    public static void main(String  [] args) {
92  
93      JtFactory factory = new JtFactory ();
94      JtBuilder builder;
95  
96  
97      // Create an instance of JtBuilder
98  
99      builder = (JtBuilder) factory.createObject ("Jt.JtBuilder", "builder");
100 
101     // Remove the object 
102 
103     factory.removeObject ("builder");
104 
105 
106   }
107 
108 
109 }
110 
111 
112
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