Java example source code file (ClassScope.java)

This example Java source code file (ClassScope.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractscope, class, classscope, constructor, method, reflection, scope

The ClassScope.java Java example source code

/*
 * 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 <tt>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);}

}