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Java > Open Source Codes > bsh > BSHTernaryExpression


1 /*****************************************************************************
2  * *
3  * This file is part of the BeanShell Java Scripting distribution. *
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8  * The contents of this file are subject to the Sun Public License Version *
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12  * The Original Code is BeanShell. The Initial Developer of the Original *
13  * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
14  * (C) 2000. All Rights Reserved. *
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28  * Patrick Niemeyer (pat@pat.net) *
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32  *****************************************************************************/
33
34
35 package bsh;
36
37 /**
38     This class needs logic to prevent the right hand side of boolean logical
39     expressions from being naively evaluated... e.g. for "foo && bar" bar
40     should not be evaluated in the case where foo is true.
41 */
42 class BSHTernaryExpression extends SimpleNode {
43
44     BSHTernaryExpression(int id) { super(id); }
45
46     public Object JavaDoc eval( CallStack callstack, Interpreter interpreter)
47         throws EvalError
48     {
49         SimpleNode
50             cond = (SimpleNode)jjtGetChild(0),
51             evalTrue = (SimpleNode)jjtGetChild(1),
52             evalFalse = (SimpleNode)jjtGetChild(2);
53
54         if ( BSHIfStatement.evaluateCondition( cond, callstack, interpreter ) )
55             return evalTrue.eval( callstack, interpreter );
56         else
57             return evalFalse.eval( callstack, interpreter );
58     }
59
60 }
61
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