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Java example source code file (NestingKind.java)

This example Java source code file (NestingKind.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

anonymous, local, member, nestingkind, top_level

The NestingKind.java Java example source code

/*
 * Copyright (c) 2005, 2013, 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 javax.lang.model.element;

/**
 * The <i>nesting kind of a type element.
 * Type elements come in four varieties:
 * top-level, member, local, and anonymous.
 * <i>Nesting kind is a non-standard term used here to denote this
 * classification.
 *
 * <p>Note that it is possible additional nesting kinds will be added
 * in future versions of the platform.
 *
 * <p>Example: The classes below are annotated with their nesting kind.
 * <blockquote>
 *
 * import java.lang.annotation.*;
 * import static java.lang.annotation.RetentionPolicy.*;
 * import javax.lang.model.element.*;
 * import static javax.lang.model.element.NestingKind.*;
 *
 * @Nesting(TOP_LEVEL)
 * public class NestingExamples {
 *     @Nesting(MEMBER)
 *     static class MemberClass1{}
 *
 *     @Nesting(MEMBER)
 *     class MemberClass2{}
 *
 *     public static void main(String... argv) {
 *         @Nesting(LOCAL)
 *         class LocalClass{};
 *
 *         Class<?>[] classes = {
 *             NestingExamples.class,
 *             MemberClass1.class,
 *             MemberClass2.class,
 *             LocalClass.class
 *         };
 *
 *         for(Class<?> clazz : classes) {
 *             System.out.format("%s is %s%n",
 *                               clazz.getName(),
 *                               clazz.getAnnotation(Nesting.class).value());
 *         }
 *     }
 * }
 *
 * @Retention(RUNTIME)
 * @interface Nesting {
 *     NestingKind value();
 * }
 * </pre>
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ahé
 * @since 1.6
 */
public enum NestingKind {
    /**
     * A top-level type, not contained within another type.
     */
    TOP_LEVEL,

    /**
     * A type that is a named member of another type.
     */
    MEMBER,

    /**
     * A named type declared within a construct other than a type.
     */
    LOCAL,

    /**
     * A type without a name.
     */
    ANONYMOUS;

    /**
     * Does this constant correspond to a nested type element?
     * A <i>nested type element is any that is not top-level.
     * An <i>inner type element is any nested type element that
     * is not {@linkplain Modifier#STATIC static}.
     * @return whether or not the constant is nested
     */
    public boolean isNested() {
        return this != TOP_LEVEL;
    }
}

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