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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
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 *
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

package com.sun.msv.grammar.xmlschema;

import com.sun.msv.grammar.ReferenceExp;

/**
 * declaration that can be redefined by using <redefine> element.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public abstract class RedefinableExp extends ReferenceExp {
    
    public RedefinableExp( String typeLocalName ) {
        super(typeLocalName);
    }
    
    /** clones this object. */
    public abstract RedefinableExp getClone();
    
    /**
     * assigns contents of rhs to this object.
     * 
     * rhs and this object must be the same runtime type, and
     * they must have the same name.
     * this method redefines this object by the given component.
     * 
     * derived class should override this method and copy
     * necessary fields, should it necessary.
     */
    public void redefine( RedefinableExp rhs ) {
        if( this.getClass()!=rhs.getClass()
        || !this.name.equals(rhs.name) )
            // two must be the same class.
            throw new IllegalArgumentException();
        
        this.exp = rhs.exp;
    }
    
    // serialization support
    private static final long serialVersionUID = 1;    
}