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Java example source code file (SimpleAnnotationValueVisitor7.java)

This example Java source code file (SimpleAnnotationValueVisitor7.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.

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Java - Java tags/keywords

simpleannotationvaluevisitor6, simpleannotationvaluevisitor7, supportedsourceversion

The SimpleAnnotationValueVisitor7.java Java example source code

/*
 * Copyright (c) 2010, 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.util;

import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import static javax.lang.model.SourceVersion.*;

/**
 * A simple visitor for annotation values with default behavior
 * appropriate for the {@link SourceVersion#RELEASE_7 RELEASE_7}
 * source version.  Visit methods call {@link #defaultAction
 * defaultAction} passing their arguments to {@code defaultAction}'s
 * corresponding parameters.
 *
 * <p> Methods in this class may be overridden subject to their
 * general contract.  Note that annotating methods in concrete
 * subclasses with {@link java.lang.Override @Override} will help
 * ensure that methods are overridden as intended.
 *
 * <p> WARNING: The {@code AnnotationValueVisitor} interface
 * implemented by this class may have methods added to it in the
 * future to accommodate new, currently unknown, language structures
 * added to future versions of the Java™ programming language.
 * Therefore, methods whose names begin with {@code "visit"} may be
 * added to this class in the future; to avoid incompatibilities,
 * classes which extend this class should not declare any instance
 * methods with names beginning with {@code "visit"}.
 *
 * <p>When such a new visit method is added, the default
 * implementation in this class will be to call the {@link
 * #visitUnknown visitUnknown} method.  A new simple annotation
 * value visitor class will also be introduced to correspond to the
 * new language level; this visitor will have different default
 * behavior for the visit method in question.  When the new visitor is
 * introduced, all or portions of this visitor may be deprecated.
 *
 * <p>Note that adding a default implementation of a new visit method
 * in a visitor class will occur instead of adding a <em>default
 * method</em> directly in the visitor interface since a Java SE 8
 * language feature cannot be used to this version of the API since
 * this version is required to be runnable on Java SE 7
 * implementations.  Future versions of the API that are only required
 * to run on Java SE 8 and later may take advantage of default methods
 * in this situation.
 *
 * @param <R> the return type of this visitor's methods
 * @param <P> the type of the additional parameter to this visitor's methods.
 *
 * @see SimpleAnnotationValueVisitor6
 * @see SimpleAnnotationValueVisitor8
 * @since 1.7
 */
@SupportedSourceVersion(RELEASE_7)
public class SimpleAnnotationValueVisitor7<R, P> extends SimpleAnnotationValueVisitor6 {
    /**
     * Constructor for concrete subclasses; uses {@code null} for the
     * default value.
     */
    protected SimpleAnnotationValueVisitor7() {
        super(null);
    }

    /**
     * Constructor for concrete subclasses; uses the argument for the
     * default value.
     *
     * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
     */
    protected SimpleAnnotationValueVisitor7(R defaultValue) {
        super(defaultValue);
    }
}

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