/*****************************************************************************
* *
* 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 ([email protected]) *
* 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 );
}
}
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