/*

 * 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.scope;

import java.lang.reflect.Constructor;

import java.lang.reflect.Method;

/**

 * This class represents the scope containing the type variables of

 * a class.

 */

public class ClassScope extends AbstractScope<Class<?>> implements Scope {

    // constructor is private to enforce use of factory method

    private ClassScope(Class<?> c){

        super(c);

    }

    /**

     * Overrides the abstract method in the superclass.

     * @return the enclosing scope

     */

    protected Scope computeEnclosingScope() {

        Class<?> receiver = getRecvr();

        Method m = receiver.getEnclosingMethod();

        if (m != null)

            // Receiver is a local or anonymous class enclosed in a

            // method.

            return MethodScope.make(m);

        Constructor<?> cnstr = receiver.getEnclosingConstructor();

        if (cnstr != null)

            // Receiver is a local or anonymous class enclosed in a

            // constructor.

            return ConstructorScope.make(cnstr);

        Class<?> c = receiver.getEnclosingClass();

        // if there is a declaring class, recvr is a member class

        // and its enclosing scope is that of the declaring class

        if (c != null)

            // Receiver is a local class, an anonymous class, or a

            // member class (static or not).

            return ClassScope.make(c);

        // otherwise, recvr is a top level class, and it has no real

        // enclosing scope.

        return DummyScope.make();

    }

    /**

     * Factory method. Takes a {@code Class} object and creates a

     * scope for it.

     * @param c - a Class whose scope we want to obtain

     * @return The type-variable scope for the class c

     */

    public static ClassScope make(Class<?> c) { return new ClassScope(c);}

}