/*****************************************************************************
* *
* This file is part of the BeanShell Java Scripting distribution. *
* Documentation and updates may be found at http://www.beanshell.org/ *
* *
* Sun Public License Notice: *
* *
* The contents of this file are subject to the Sun Public License Version *
* 1.0 (the "License"); you may not use this file except in compliance with *
* the License. A copy of the License is available at http://www.sun.com *
* *
* The Original Code is BeanShell. The Initial Developer of the Original *
* Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
* (C) 2000. All Rights Reserved. *
* *
* GNU Public License Notice: *
* *
* Alternatively, the contents of this file may be used under the terms of *
* the GNU Lesser General Public License (the "LGPL"), in which case the *
* provisions of LGPL are applicable instead of those above. If you wish to *
* allow use of your version of this file only under the terms of the LGPL *
* and not to allow others to use your version of this file under the SPL, *
* indicate your decision by deleting the provisions above and replace *
* them with the notice and other provisions required by the LGPL. If you *
* do not delete the provisions above, a recipient may use your version of *
* this file under either the SPL or the LGPL. *
* *
* Patrick Niemeyer (pat@pat.net) *
* Author of Learning Java, O'Reilly & Associates *
* http://www.pat.net/~pat/ *
* *
*****************************************************************************/
package bsh;
class
BSHIfStatement extends
SimpleNode
{
BSHIfStatement(int
id) { super(
id); }
public
Object eval(
CallStack callstack,
Interpreter interpreter)
throws
EvalError
{
Object ret = null;
if(
evaluateCondition(
(
SimpleNode)
jjtGetChild(0),
callstack,
interpreter ) )
ret = ((
SimpleNode)
jjtGetChild(1)).
eval(
callstack,
interpreter);
else
if(
jjtGetNumChildren() > 2)
ret = ((
SimpleNode)
jjtGetChild(2)).
eval(
callstack,
interpreter);
if(
ret instanceof
ReturnControl)
return
ret;
else
return
Primitive.
VOID;
}
public static boolean
evaluateCondition(
SimpleNode condExp,
CallStack callstack,
Interpreter interpreter)
throws
EvalError
{
Object obj =
condExp.
eval(
callstack,
interpreter);
if(
obj instanceof
Primitive) {
if (
obj ==
Primitive.
VOID )
throw new
EvalError("Condition evaluates to void type",
condExp,
callstack );
obj = ((
Primitive)
obj).
getValue();
}
if(
obj instanceof
Boolean)
return ((
Boolean)
obj).
booleanValue();
else
throw new
EvalError(
"Condition must evaluate to a Boolean or boolean.",
condExp,
callstack );
}
}