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/*
 * #%L
 * The AIBench Shell Plugin
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 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
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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.                                          *
 *                                                                           *
 *  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    *
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 *  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 BSHFormalParameters extends SimpleNode {
        private String[] paramNames;

        /**
         * For loose type parameters the paramTypes are null.
         */
        // unsafe caching of types
        Class[] paramTypes;

        int numArgs;

        String[] typeDescriptors;

        BSHFormalParameters(int id) {
                super(id);
        }

        void insureParsed() {
                if (paramNames != null)
                        return;

                this.numArgs = jjtGetNumChildren();
                String[] paramNames = new String[numArgs];

                for (int i = 0; i < numArgs; i++) {
                        BSHFormalParameter param = (BSHFormalParameter) jjtGetChild(i);
                        paramNames[i] = param.name;
                }

                this.paramNames = paramNames;
        }

        public String[] getParamNames() {
                insureParsed();
                return paramNames;
        }

        public String[] getTypeDescriptors(CallStack callstack, Interpreter interpreter, String defaultPackage) {
                if (typeDescriptors != null)
                        return typeDescriptors;

                insureParsed();
                String[] typeDesc = new String[numArgs];

                for (int i = 0; i < numArgs; i++) {
                        BSHFormalParameter param = (BSHFormalParameter) jjtGetChild(i);
                        typeDesc[i] = param.getTypeDescriptor(callstack, interpreter, defaultPackage);
                }

                this.typeDescriptors = typeDesc;
                return typeDesc;
        }

        /**
         * Evaluate the types. Note that type resolution does not require the
         * interpreter instance.
         */
        public Object eval(CallStack callstack, Interpreter interpreter) throws EvalError {
                if (paramTypes != null)
                        return paramTypes;

                insureParsed();
                Class[] paramTypes = new Class[numArgs];

                for (int i = 0; i < numArgs; i++) {
                        BSHFormalParameter param = (BSHFormalParameter) jjtGetChild(i);
                        paramTypes[i] = (Class) param.eval(callstack, interpreter);
                }

                this.paramTypes = paramTypes;

                return paramTypes;
        }
}