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BSHCastExpression.java
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64 lines (54 loc) · 2.91 KB
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/*****************************************************************************
* 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 ([email protected]) *
* 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
{
Class toType = ((BSHType)jjtGetChild(0)).getType(
callstack, interpreter );
Node expression = jjtGetChild(1);
// evaluate the expression
Object fromValue = expression.eval(callstack, interpreter);
// 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 );
}
}
}