/*****************************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* distributed with this work for additional information *
* regarding copyright ownership. The ASF licenses this file *
* to you under the Apache License, Version 2.0 (the *
* "License"); you may not use this file except in compliance *
* with the License. You may obtain a copy of the License at *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, *
* software distributed under the License is distributed on an *
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
* KIND, either express or implied. See the License for the *
* specific language governing permissions and limitations *
* under the License. *
* *
* *
* This file is part of the BeanShell Java Scripting distribution. *
* Documentation and updates may be found at http://www.beanshell.org/ *
* Patrick Niemeyer (pat@pat.net) *
* Author of Learning Java, O'Reilly & Associates *
* *
*****************************************************************************/
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 );
}
}
}