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package javax.lang.model.util;

import javax.annotation.processing.SupportedSourceVersion;

import javax.lang.model.SourceVersion;

import javax.lang.model.element.ModuleElement;

import static javax.lang.model.SourceVersion.*;

/**

 * A skeletal visitor of program elements with default behavior

 * appropriate for source versions {@link SourceVersion#RELEASE_9

 *

 * <p> <b>WARNING:</b> The {@code ElementVisitor} 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 abstract element 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.  Use {@link

 *            Void} for visitors that do not need to return results.

 * @param <P> the type of the additional parameter to this visitor's

 *            methods.  Use {@code Void} for visitors that do not need an

 *            additional parameter.

 *

 * @see AbstractElementVisitor6

 * @see AbstractElementVisitor7

 * @see AbstractElementVisitor8

 * @since 9

 * @spec JPMS

 */

public abstract class AbstractElementVisitor9<R, P> extends AbstractElementVisitor8<R, P> {

    /**

     * Constructor for concrete subclasses to call.

     */

    protected AbstractElementVisitor9(){

        super();

    }

    /**

     * {@inheritDoc}

     *

     * @implSpec Visits a {@code ModuleElement} in a manner defined by a

     * subclass.

     *

     * @param t  {@inheritDoc}

     * @param p  {@inheritDoc}

     * @return   {@inheritDoc}

     */

    @Override

    public abstract R visitModule(ModuleElement t, P p);

}