1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* ConditionalExpression.java 1.0
*
*
* Jun 20, 1997 by mich
* Sep 29, 1997 by bv
* Oct 10, 1997 by mich
*
* @see io.devnulllabs.openjava.ptree.ParseTree
* @version 1.0 last updated: Oct 10, 1997
* @author Michiaki Tatsubori
*/
package io.devnulllabs.openjava.ptree;
import io.devnulllabs.openjava.mop.Environment;
import io.devnulllabs.openjava.mop.OJClass;
import io.devnulllabs.openjava.ptree.util.ParseTreeVisitor;
/**
* The <code>ConditionalExpression</code> class represents
* a conditional expression like:
* <br><blockquote><pre>
* (i == 1) ? 3 : 4
* </pre></blockquote><br>
* This consists of a conditional part, true case part, and
* false case part.
* Each part of them is an expression.
* <br>
* If the operator in the expression of the operands has week unity,
* this automatically produces the code in which the operands
* are enclosed by parenthesises.
* <br>
* In the case the conditional part is <code>f = f()</code>,
* the true case part is <code>"red"</code>
* and the false case part is <code>str = "blue"</code>
* this produces the code :
* <br><blockquote><pre>
* (f = f()) ? "red" : (str = "blue")
* </pre></blockquote><br>
*
* @see io.devnulllabs.openjava.ptree.Expression
*/
public class ConditionalExpression extends NonLeaf implements Expression {
/**
* Allocates a new conditional expression object.
*
* @param condition the conditional part of this expression.
* @param truecase the expression to be evaluated when conditional
* part is true.
* @param falsecase the expression to be evaluated when conditional
* part is false.
*/
public ConditionalExpression(
Expression condition,
Expression truecase,
Expression falsecase) {
super();
set(condition, truecase, falsecase);
}
ConditionalExpression() {
super();
}
/**
* Gets the conditional part of this conditional expression.
*
* @return the expression of this conditional part.
*/
public Expression getCondition() {
return (Expression) elementAt(0);
}
/**
* Sets the conditional part of this conditional expression.
*
* @param expr the expression to set as this conditional part.
*/
public void setCondition(Expression expr) {
setElementAt(expr, 0);
}
/**
* Gets the true case part of this conditional expression.
*
* @return the expression of this true case part.
*/
public Expression getTrueCase() {
return (Expression) elementAt(1);
}
/**
* Sets the true case part of this conditional expression.
*
* @param expr the expression to set as this true part.
*/
public void setTrueCase(Expression expr) {
setElementAt(expr, 1);
}
/**
* Gets the false case part of this.
*
* @return the expression of this false case part.
*/
public Expression getFalseCase() {
return (Expression) elementAt(2);
}
/**
* Sets the false case part of this.
*
* @param expr the expression to set as this false part.
*/
public void setFalseCase(Expression expr) {
setElementAt(expr, 2);
}
public void accept(ParseTreeVisitor v) throws ParseTreeException {
v.visit(this);
}
public OJClass getType(Environment env) throws Exception {
return BinaryExpression.chooseType(
getTrueCase().getType(env),
getFalseCase().getType(env));
}
}
|
