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 * by Oracle in the LICENSE file that accompanied this code.

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 * This code is distributed in the hope that it will be useful, but WITHOUT

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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 * accompanied this code).

 *

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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 source versions {@link SourceVersion#RELEASE_9

 *

 * 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> <b>WARNING:</b> 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.

 *

 * @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 SimpleAnnotationValueVisitor7

 * @see SimpleAnnotationValueVisitor8

 * @since 9

 */

public class SimpleAnnotationValueVisitor9<R, P> extends SimpleAnnotationValueVisitor8<R, P> {

    /**

     * Constructor for concrete subclasses; uses {@code null} for the

     * default value.

     */

    protected SimpleAnnotationValueVisitor9() {

        super(null);

    }

    /**

     * Constructor for concrete subclasses; uses the argument for the

     * default value.

     *

     * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}

     */

    protected SimpleAnnotationValueVisitor9(R defaultValue) {

        super(defaultValue);

    }

}