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 * The AIBench Shell Plugin
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/*****************************************************************************
 *                                                                           *
 *  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.                                          *
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 *                                                                           *
 *  Patrick Niemeyer ([email protected])                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/

package bsh;

public class DelayedEvalBshMethod extends BshMethod {
        String returnTypeDescriptor;

        BSHReturnType returnTypeNode;

        String[] paramTypeDescriptors;

        BSHFormalParameters paramTypesNode;

        // used for the delayed evaluation...
        transient CallStack callstack;

        transient Interpreter interpreter;

        /**
         * This constructor is used in class generation. It supplies String type
         * descriptors for return and parameter class types and allows delay of
         * the evaluation of those types until they are requested. It does this
         * by holding BSHType nodes, as well as an evaluation callstack, and
         * interpreter which are called when the class types are requested.
         */
        /*
         * Note: technically I think we could get by passing in only the current
         * namespace or perhaps BshClassManager here instead of CallStack and
         * Interpreter. However let's just play it safe in case of future
         * changes - anywhere you eval a node you need these.
         */
        DelayedEvalBshMethod(String name, String returnTypeDescriptor, BSHReturnType returnTypeNode, String[] paramNames, String[] paramTypeDescriptors, BSHFormalParameters paramTypesNode, BSHBlock methodBody, NameSpace declaringNameSpace, Modifiers modifiers, CallStack callstack, Interpreter interpreter) {
                super(name, null/* returnType */, paramNames, null/* paramTypes */, methodBody, declaringNameSpace, modifiers);

                this.returnTypeDescriptor = returnTypeDescriptor;
                this.returnTypeNode = returnTypeNode;
                this.paramTypeDescriptors = paramTypeDescriptors;
                this.paramTypesNode = paramTypesNode;
                this.callstack = callstack;
                this.interpreter = interpreter;
        }

        public String getReturnTypeDescriptor() {
                return returnTypeDescriptor;
        }

        public Class getReturnType() {
                if (returnTypeNode == null)
                        return null;

                // BSHType will cache the type for us
                try {
                        return returnTypeNode.evalReturnType(callstack, interpreter);
                } catch (EvalError e) {
                        throw new InterpreterError("can't eval return type: " + e);
                }
        }

        public String[] getParamTypeDescriptors() {
                return paramTypeDescriptors;
        }

        public Class[] getParameterTypes() {
                // BSHFormalParameters will cache the type for us
                try {
                        return (Class[]) paramTypesNode.eval(callstack, interpreter);
                } catch (EvalError e) {
                        throw new InterpreterError("can't eval param types: " + e);
                }
        }
}