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JDK 1.6
  javax.lang.model.util. TypeKindVisitor6 View Javadoc
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/*
 * @(#)TypeKindVisitor6.java	1.6 06/08/07
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

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;

/**
 * A visitor of types based on their {@linkplain TypeKind kind} with
 * default behavior appropriate for the {@link SourceVersion#RELEASE_6
 * RELEASE_6} source version.  For {@linkplain
 * TypeMirror types} <tt><i>XYZ</i></tt> that may have more than one
 * kind, the <tt>visit<i>XYZ</i></tt> methods in this class delegate
 * to the <tt>visit<i>XYZKind</i></tt> method corresponding to the
 * first argument's kind.  The <tt>visit<i>XYZKind</i></tt> methods
 * 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&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 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.
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ah&eacute;
 * @version 1.6 06/08/07
 * @since 1.6
 */
@SupportedSourceVersion(RELEASE_6)
public class TypeKindVisitor6<R, P> extends SimpleTypeVisitor6<R, P> {
    /**
     * Constructor for concrete subclasses to call; uses {@code null}
     * for the default value.
     */
    protected TypeKindVisitor6() {
	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 TypeKindVisitor6(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);
    }
}

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