/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the License).  You may not use this file except in
 * compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html or
 * glassfish/bootstrap/legal/CDDLv1.0.txt.
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * Header Notice in each file and include the License file 
 * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
 * If applicable, add the following below the CDDL Header, 
 * with the fields enclosed by brackets [] replaced by
 * you own identifying information: 
 * "Portions Copyrighted [year] [name of copyright owner]"
 * 
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 */

/*
 * NullType.java
 *
 * Created on March 8, 2000
 */

package com.sun.jdo.spi.persistence.support.sqlstore.query.util.type;

/**
 * This class represents the type of null.
 *
 * @author  Michael Bouschen
 * @version 0.1
 */
public class NullType
    extends Type
{
    /**
     *
     */
    NullType()
    {
        super("null", void.class); //NOI18N
    }

    /**
     * An NullType object is compatible to
     * - the errorType object
     * - an object of type NullType (to itself)
     * - an object of type ClassType
     */
    public boolean isCompatibleWith(Type type)
    {
        return (type.equals(TypeTable.errorType) ||
                (type instanceof NullType) ||
                (type instanceof ClassType));
    }


}
