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package javax.lang.model.util;

import java.util.List;

import javax.lang.model.element.*;

import javax.lang.model.type.TypeMirror;

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

import javax.lang.model.SourceVersion;

import javax.annotation.processing.SupportedSourceVersion;

/**

 * A simple visitor for annotation values with default behavior

 * appropriate for the {@link SourceVersion#RELEASE_6 RELEASE_6}

 * source version.  Visit methods call {@link

 * #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 AnnotationValueVisitor} 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 simple annotation

 * value 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.

 *

 * <p>Note that adding a default implementation of a new visit method

 * in a visitor class will occur instead of adding a <em>default

 * method</em> directly in the visitor interface since a Java SE 8

 * language feature cannot be used to this version of the API since

 * this version is required to be runnable on Java SE 7

 * implementations.  Future versions of the API that are only required

 * to run on Java SE 8 and later may take advantage of default methods

 * in this situation.

 *

 * @param <R> the return type of this visitor's methods

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

 *

 * @author Joseph D. Darcy

 * @author Scott Seligman

 * @author Peter von der Ahé

 *

 * @see SimpleAnnotationValueVisitor7

 * @see SimpleAnnotationValueVisitor8

 * @since 1.6

 */

@SupportedSourceVersion(RELEASE_6)

public class SimpleAnnotationValueVisitor6<R, P>

    extends AbstractAnnotationValueVisitor6<R, P> {

    /**

     * Default value to be returned; {@link #defaultAction

     * defaultAction} returns this value unless the method is

     * overridden.

     */

    protected final R DEFAULT_VALUE;

    /**

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

     * default value.

     */

    protected SimpleAnnotationValueVisitor6() {

        super();

        DEFAULT_VALUE = null;

    }

    /**

     * Constructor for concrete subclasses; uses the argument for the

     * default value.

     *

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

     */

    protected SimpleAnnotationValueVisitor6(R defaultValue) {

        super();

        DEFAULT_VALUE = defaultValue;

    }

    /**

     * The default action for visit methods.  The implementation in

     * this class just returns {@link #DEFAULT_VALUE}; subclasses will

     * commonly override this method.

     *

     * @param o the value of the annotation

     * @param p a visitor-specified parameter

     * @return {@code DEFAULT_VALUE} unless overridden

     */

    protected R defaultAction(Object o, P p) {

        return DEFAULT_VALUE;

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param b {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitBoolean(boolean b, P p) {

        return defaultAction(b, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param b {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitByte(byte b, P p) {

        return defaultAction(b, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param c {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitChar(char c, P p) {

        return defaultAction(c, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param d {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitDouble(double d, P p) {

        return defaultAction(d, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param f {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitFloat(float f, P p) {

        return defaultAction(f, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param i {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitInt(int i, P p) {

        return defaultAction(i, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param i {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitLong(long i, P p) {

        return defaultAction(i, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param s {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitShort(short s, P p) {

        return defaultAction(s, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param s {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitString(String s, P p) {

        return defaultAction(s, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param t {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitType(TypeMirror t, P p) {

        return defaultAction(t, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param c {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitEnumConstant(VariableElement c, P p) {

        return defaultAction(c, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param a {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitAnnotation(AnnotationMirror a, P p) {

        return defaultAction(a, p);

    }

    /**

     * {@inheritDoc} This implementation calls {@code defaultAction}.

     *

     * @param vals {@inheritDoc}

     * @param p {@inheritDoc}

     * @return  the result of {@code defaultAction}

     */

    public R visitArray(List<? extends AnnotationValue> vals, P p) {

        return defaultAction(vals, p);

    }

}