/*****************************************************************************
* *
* 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, *
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* Patrick Niemeyer ([email protected]) *
* Author of Learning Java, O'Reilly & Associates *
* http://www.pat.net/~pat/ *
* *
*****************************************************************************/
package bsh;
/**
Implement casts.
I think it should be possible to simplify some of the code here by
using the Types.getAssignableForm() method, but I haven't looked
into it.
*/
class BSHCastExpression extends SimpleNode {
public BSHCastExpression(int id) { super(id); }
/**
@return the result of the cast.
*/
public Object eval(
CallStack callstack, Interpreter interpreter ) throws EvalError
{
NameSpace namespace = callstack.top();
Class toType = ((BSHType)jjtGetChild(0)).getType(
callstack, interpreter );
SimpleNode expression = (SimpleNode)jjtGetChild(1);
// evaluate the expression
Object fromValue = expression.eval(callstack, interpreter);
Class fromType = fromValue.getClass();
// TODO: need to add isJavaCastable() test for strictJava
// (as opposed to isJavaAssignable())
try {
return Types.castObject( fromValue, toType, Types.CAST );
} catch ( UtilEvalError e ) {
throw e.toEvalError( this, callstack );
}
}
}
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