/*

 * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.reflect.generics.repository;

import java.lang.reflect.Type;

import sun.reflect.generics.factory.GenericsFactory;

import sun.reflect.generics.parser.SignatureParser;

import sun.reflect.generics.tree.FieldTypeSignature;

import sun.reflect.generics.tree.MethodTypeSignature;

import sun.reflect.generics.tree.TypeSignature;

import sun.reflect.generics.visitor.Reifier;

/**

 * This class represents the generic type information for a constructor.

 * The code is not dependent on a particular reflective implementation.

 * It is designed to be used unchanged by at least core reflection and JDI.

 */

public class ConstructorRepository

    extends GenericDeclRepository<MethodTypeSignature> {

    private Type[] paramTypes; // caches the generic parameter types info

    private Type[] exceptionTypes; // caches the generic exception types info

 // protected, to enforce use of static factory yet allow subclassing

    protected ConstructorRepository(String rawSig, GenericsFactory f) {

      super(rawSig, f);

    }

    protected MethodTypeSignature parse(String s) {

        return SignatureParser.make().parseMethodSig(s);

    }

    /**

     * Static factory method.

     * @param rawSig - the generic signature of the reflective object

     * that this repository is servicing

     * @param f - a factory that will provide instances of reflective

     * objects when this repository converts its AST

     * @return a <tt>ConstructorRepository</tt> that manages the generic type

     * information represented in the signature <tt>rawSig</tt>

     */

    public static ConstructorRepository make(String rawSig,

                                             GenericsFactory f) {

        return new ConstructorRepository(rawSig, f);

    }

    // public API

 /*

 * When queried for a particular piece of type information, the

 * general pattern is to consult the corresponding cached value.

 * If the corresponding field is non-null, it is returned.

 * If not, it is created lazily. This is done by selecting the appropriate

 * part of the tree and transforming it into a reflective object

 * using a visitor.

 * a visitor, which is created by feeding it the factory

 * with which the repository was created.

 */

    public Type[] getParameterTypes(){

        if (paramTypes == null) { // lazily initialize parameter types

            // first, extract parameter type subtree(s) from AST

            TypeSignature[] pts = getTree().getParameterTypes();

            // create array to store reified subtree(s)

            Type[] ps = new Type[pts.length];

            // reify all subtrees

            for (int i = 0; i < pts.length; i++) {

                Reifier r = getReifier(); // obtain visitor

                pts[i].accept(r); // reify subtree

                // extract result from visitor and store it

                ps[i] = r.getResult();

            }

            paramTypes = ps; // cache overall result

        }

        return paramTypes.clone(); // return cached result

    }

    public Type[] getExceptionTypes(){

        if (exceptionTypes == null) { // lazily initialize exception types

            // first, extract exception type subtree(s) from AST

            FieldTypeSignature[] ets = getTree().getExceptionTypes();

            // create array to store reified subtree(s)

            Type[] es = new Type[ets.length];

            // reify all subtrees

            for (int i = 0; i < ets.length; i++) {

                Reifier r = getReifier(); // obtain visitor

                ets[i].accept(r); // reify subtree

                // extract result from visitor and store it

                es[i] = r.getResult();

            }

            exceptionTypes = es; // cache overall result

        }

        return exceptionTypes.clone(); // return cached result

    }

}