/*
 * Copyright 2010 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package javax.lang.model.util;

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

/**
 * Shared package private class to reduce code bloat.
 *
 * @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.
 *
 * @since 1.7
 */
class SharedTypeKindVisitor<R, P> extends SimpleTypeVisitor6<R, P> {
    /**
     * Constructor for concrete subclasses to call; uses {@code null}
     * for the default value.
     */
    protected SharedTypeKindVisitor() {
        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 SharedTypeKindVisitor(R defaultValue) {
        super(defaultValue);
    }

    /**
     * Visits a primitive type, dispatching to the visit method for
     * the specific {@linkplain TypeKind kind} of primitive type:
     * {@code BOOLEAN}, {@code BYTE}, etc.
     *
     * @param t {@inheritDoc}
     * @param p {@inheritDoc}
     * @return  the result of the kind-specific visit method
     */
    @Override
    public R visitPrimitive(PrimitiveType t, P p) {
        TypeKind k = t.getKind();
        switch (k) {
        case BOOLEAN:
            return visitPrimitiveAsBoolean(t, p);

        case BYTE:
            return visitPrimitiveAsByte(t, p);

        case SHORT:
            return visitPrimitiveAsShort(t, p);

        case INT:
            return visitPrimitiveAsInt(t, p);

        case LONG:
            return visitPrimitiveAsLong(t, p);

        case CHAR:
            return visitPrimitiveAsChar(t, p);

        case FLOAT:
            return visitPrimitiveAsFloat(t, p);

        case DOUBLE:
            return visitPrimitiveAsDouble(t, p);

        default:
            throw new AssertionError("Bad kind " + k + " for PrimitiveType" + t);
        }
    }

    /**
     * Visits a {@code BOOLEAN} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsBoolean(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@code BYTE} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsByte(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@code SHORT} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsShort(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits an {@code INT} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsInt(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@code LONG} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsLong(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@code CHAR} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsChar(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@code FLOAT} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsFloat(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@code DOUBLE} primitive type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitPrimitiveAsDouble(PrimitiveType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@link NoType} instance, dispatching to the visit method for
     * the specific {@linkplain TypeKind kind} of pseudo-type:
     * {@code VOID}, {@code PACKAGE}, or {@code NONE}.
     *
     * @param t {@inheritDoc}
     * @param p {@inheritDoc}
     * @return  the result of the kind-specific visit method
     */
    @Override
    public R visitNoType(NoType t, P p) {
        TypeKind k = t.getKind();
        switch (k) {
        case VOID:
            return visitNoTypeAsVoid(t, p);

        case PACKAGE:
            return visitNoTypeAsPackage(t, p);

        case NONE:
            return visitNoTypeAsNone(t, p);

        default:
            throw new AssertionError("Bad kind " + k + " for NoType" + t);
        }
    }

    /**
     * Visits a {@link TypeKind#VOID VOID} pseudo-type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitNoTypeAsVoid(NoType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@link TypeKind#PACKAGE PACKAGE} pseudo-type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitNoTypeAsPackage(NoType t, P p) {
        return defaultAction(t, p);
    }

    /**
     * Visits a {@link TypeKind#NONE NONE} pseudo-type by calling
     * {@code defaultAction}.
     *
     * @param t the type to visit
     * @param p a visitor-specified parameter
     * @return  the result of {@code defaultAction}
     */
    public R visitNoTypeAsNone(NoType t, P p) {
        return defaultAction(t, p);
    }
}