https://openjdk.java.net/ 
/*
 * Copyright (c) 2011, 2020, 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 javax.lang.model.element.ModuleElement;
import static javax.lang.model.SourceVersion.*;


A simple visitor of program elements with default behavior appropriate for source versions 
RELEASE_9 through RELEASE_14. Visit methods corresponding to RELEASE_9 and earlier language constructs call defaultAction, passing their arguments to defaultAction's corresponding parameters. 
Type parameters:
  • <R> – the return type of this visitor's methods. Use Void for visitors that do not need to return results.
  • <P> – the type of the additional parameter to this visitor's methods. Use Void for visitors that do not need an additional parameter.
See Also:
API Note:
Methods in this class may be overridden subject to their general
contract.
Since:9
@specJPMS
/**
 * A simple visitor of program elements with default behavior
 * appropriate for source versions {@link SourceVersion#RELEASE_9
 * RELEASE_9} through {@link SourceVersion#RELEASE_14 RELEASE_14}.
 *
 * Visit methods corresponding to {@code RELEASE_9} and earlier
 * language constructs call {@link #defaultAction defaultAction},
 * passing their arguments to {@code defaultAction}'s corresponding
 * parameters.
 *
 * @apiNote
 * Methods in this class may be overridden subject to their general
 * contract.
 *
 * @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 <a href="SimpleElementVisitor6.html#note_for_subclasses">
 * <strong>Compatibility note for subclasses</strong></a>
 * @see SimpleElementVisitor6
 * @see SimpleElementVisitor7
 * @see SimpleElementVisitor8
 * @see SimpleElementVisitor14
 * @since 9
 * @spec JPMS
 */
@SupportedSourceVersion(RELEASE_14)
public class SimpleElementVisitor9<R, P> extends SimpleElementVisitor8<R, P> {
    
Constructor for concrete subclasses; uses null for the default value. 
/**
     * Constructor for concrete subclasses; uses {@code null} for the
     * default value.
     */
    protected SimpleElementVisitor9(){
        super(null);
    }

    
Constructor for concrete subclasses; uses the argument for the
default value.

Params:
/**
     * Constructor for concrete subclasses; uses the argument for the
     * default value.
     *
     * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
     */
    protected SimpleElementVisitor9(R defaultValue){
        super(defaultValue);
    }

    
{@inheritDoc}

Params:
  • e – the element to visit
  • p – a visitor-specified parameter
Implementation Requirements:Visits a ModuleElement by calling 
defaultAction.
Returns: {@inheritDoc}
/**
     * {@inheritDoc}
     *
     * @implSpec Visits a {@code ModuleElement} by calling {@code
     * defaultAction}.
     *
     * @param e the element to visit
     * @param p a visitor-specified parameter
     * @return  {@inheritDoc}
     */
    @Override
    public R visitModule(ModuleElement e, P p) {
        return defaultAction(e, p);
    }
}