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1 package com.teamkonzept.lib.math;
2
3
4 public class CompareOperator extends BinaryOperator{
5
6 final static int EQUAL = 0;
7 final static int NOT_EQUAL = 1;
8 final static int LESS = 2;
9 final static int LESS_OR_EQUAL = 3;
10 final static int GREATER = 4;
11 final static int GREATER_OR_EQUAL = 5;
12
13 int type;
14
15 public CompareOperator(int type, int parenlevel, int position)
16 throws UnsupportedOperatorException{
17 super(parenlevel, getPriority(type, position), position);
18 this.type = type;
19 }
20
21
26 public Object  evaluate(Object left, Object right)
27 throws BadOperandTypeException{
28 if ( !(left instanceof Double ) )
29 throw new BadOperandTypeException(left, "Double");
30 if ( !(right instanceof Double ) )
31 throw new BadOperandTypeException(right, "Double");
32 if ( type == EQUAL )
33 return new Boolean (((Double )left).doubleValue()
34 == ((Double )right).doubleValue());
35 else if ( type == NOT_EQUAL )
36 return new Boolean (((Double )left).doubleValue()
37 != ((Double )right).doubleValue());
38 else if ( type == LESS )
39 return new Boolean (((Double )left).doubleValue()
40 < ((Double )right).doubleValue());
41 else if ( type == LESS_OR_EQUAL )
42 return new Boolean (((Double )left).doubleValue()
43 <= ((Double )right).doubleValue());
44 else if ( type == GREATER )
45 return new Boolean (((Double )left).doubleValue()
46 > ((Double )right).doubleValue());
47 else return new Boolean (((Double )left).doubleValue()
49 >= ((Double )right).doubleValue());
50 }
51
52
53 static int getPriority(int op, int position)
54 throws UnsupportedOperatorException{
55 switch ( op ){
56 case EQUAL:
57 return COMPARE_EQUAL_PRIORITY;
58 case NOT_EQUAL:
59 return COMPARE_EQUAL_PRIORITY;
60 case LESS:
61 return COMPARE_LESS_PRIORITY;
62 case LESS_OR_EQUAL:
63 return COMPARE_LESS_PRIORITY;
64 case GREATER:
65 return COMPARE_LESS_PRIORITY;
66 case GREATER_OR_EQUAL:
67 return COMPARE_LESS_PRIORITY;
68 default:
69 throw new UnsupportedOperatorException(CompareOperator.class,
70 op, position);
71 }
72 }
73
74 }
75 |
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