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 * 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,

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 *

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package javax.lang.model.util;

import javax.lang.model.type.*;

import javax.annotation.processing.SupportedSourceVersion;

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

import javax.lang.model.SourceVersion;

/**

 * A visitor of types based on their {@linkplain TypeKind kind} with

 * default behavior appropriate for the {@link SourceVersion#RELEASE_7

 * RELEASE_7} source version.  For {@linkplain

 * 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 TypeVisitor} 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 type kind 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 TypeKindVisitor6

 * @see TypeKindVisitor8

 * @since 1.7

 */

@SuppressWarnings("deprecation") // Superclass deprecated

@SupportedSourceVersion(RELEASE_7)

public class TypeKindVisitor7<R, P> extends TypeKindVisitor6<R, P> {

    /**

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

     * for the default value.

     */

    protected TypeKindVisitor7() {

        super(null);

    }

    /**

     * Constructor for concrete subclasses to call; uses the argument

     * for the default value.

     *

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

     */

    protected TypeKindVisitor7(R defaultValue) {

        super(defaultValue);

    }

    /**

     * This implementation visits a {@code UnionType} by calling

     * {@code defaultAction}.

     *

     * @param t  {@inheritDoc}

     * @param p  {@inheritDoc}

     * @return the result of {@code defaultAction}

     */

    @Override

    public R visitUnion(UnionType t, P p) {

        return defaultAction(t, p);

    }

}