/*

 * Copyright (c) 2003, 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.visitor.Reifier;

/**

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

 * 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 MethodRepository extends ConstructorRepository {

    /** The generic return type info.  Lazily initialized. */

    private volatile Type returnType;

 // private, to enforce use of static factory

    private MethodRepository(String rawSig, GenericsFactory f) {

      super(rawSig, f);

    }

    /**

     * 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 {@code MethodRepository} that manages the generic type

     * information represented in the signature {@code rawSig}

     */

    public static MethodRepository make(String rawSig, GenericsFactory f) {

        return new MethodRepository(rawSig, f);

    }

    public Type getReturnType() {

        Type value = returnType;

        if (value == null) {

            value = computeReturnType();

            returnType = value;

        }

        return value;

    }

    private Type computeReturnType() {

        Reifier r = getReifier(); // obtain visitor

        // Extract return type subtree from AST and reify

        getTree().getReturnType().accept(r);

        // extract result from visitor and cache it

        return r.getResult();

    }

}