/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package javax.lang.model.util;

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

/**
 * {@preview Associated with records, a preview feature of the Java language.
 *
 *           This class is associated with <i>records</i>, a preview
 *           feature of the Java language. Preview features
 *           may be removed in a future release, or upgraded to permanent
 *           features of the Java language.}
 *
 * A simple visitor of program elements with default behavior
 * appropriate for the {@link SourceVersion#RELEASE_14 RELEASE_14}
 * source version.
 *
 * Visit methods corresponding to {@code RELEASE_14} and earlier
 * language constructs 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 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&trade; 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 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 {@code 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 SimpleElementVisitor6
 * @see SimpleElementVisitor7
 * @see SimpleElementVisitor8
 * @see SimpleElementVisitor9
 * @since 14
 */
@jdk.internal.PreviewFeature(feature=jdk.internal.PreviewFeature.Feature.RECORDS,
                             essentialAPI=false)
@SupportedSourceVersion(RELEASE_14)
public class SimpleElementVisitor14<R, P> extends SimpleElementVisitor9<R, P> {
    /**
     * Constructor for concrete subclasses; uses {@code null} for the
     * default value.
     */
    protected SimpleElementVisitor14(){
        super(null);
    }

    /**
     * Constructor for concrete subclasses; uses the argument for the
     * default value.
     *
     * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
     */
    protected SimpleElementVisitor14(R defaultValue){
        super(defaultValue);
    }

    /**
     * {@inheritDoc}
     *
     * @implSpec Visits a {@code RecordComponentElement} by calling {@code
     * defaultAction}.
     *
     * @param e the element to visit
     * @param p a visitor-specified parameter
     * @return  {@inheritDoc}
     */
    @SuppressWarnings("preview")
    @Override
    public R visitRecordComponent(RecordComponentElement e, P p) {
        return defaultAction(e, p);
    }
}
