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1
2
3 package Jt.examples.patterns;
4 import java.util.*;
5 import java.lang.reflect.*;
6 import java.beans.*;
7 import java.io.*;
8 import Jt.*;
9
10
13
14 public class MultiplicationB extends JtObject {
15
16
17
18 public MultiplicationB () {
19 }
20
21
22 private int multiply (int op1, int op2) {
23 int i, o1, o2;
24 int result = 0;
25 int sign = 0;
26
27 if (op1 == 0 || op2 == 0)
28 return (0);
29
30 if (op1 < 0 && op2 < 0) {
31 o1 = -op1;
32 o2 = -op2;
33 sign = 1;
34 } else if (op1 < 0) {
35 o1 = -op1;
36 o2 = op2;
37 sign = -1;
38 } else if (op2 < 0) {
39 o1 = op1;
40 o2 = -op2;
41 sign = -1;
42
43 } else {
44 sign = 1;
45 o1 = op1;
46 o2 = op2;
47 }
48
49 for (i = 0; i < o1; i++)
50 result += o2;
51
52 if (sign > 0)
53 return (result);
54 else
55 return (-result);
56
57 }
58
59
60
66
67 public Object  processMessage (Object event) {
68
69 String msgid = null;
70 JtMessage e = (JtMessage) event;
71 Object content;
72 Object data;
73 int op1, op2;
74
75
76 if (e == null)
77 return null;
78
79 msgid = (String ) e.getMsgId ();
80
81 if (msgid == null)
82 return null;
83
84 content = e.getMsgContent();
85 data = e.getMsgData ();
86
87 op1 = ((Integer ) content).intValue ();
88
89 op2 = ((Integer ) data).intValue ();
90
91 if (msgid.equals ("MULTIPLY")) {
92 return (new Integer (multiply (op1, op2)));
93 }
94
95
96 if (msgid.equals ("JtREMOVE")) {
97 return (null);
98 }
99
100
101 handleError ("MultiplicationB.processMessage: invalid message id:" + msgid);
102 return (null);
103
104 }
105
106
107
108 }
109
110
111 |
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