/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache\@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/**
 * $Log$
 * Revision 1.1  1999/11/09 01:08:58  twl
 * Initial revision
 *
 * Revision 1.2  1999/11/08 20:44:18  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */

#ifndef DOM_EntityReference_HEADER_GUARD_
#define DOM_EntityReference_HEADER_GUARD_

#include <util/XML4CDefs.hpp>
#include <dom/DOM_Node.hpp>

class EntityReferenceImpl;

/**
 * <code>EntityReference</code> nodes will appear in the structure 
 * model when an entity reference is in the source document, or when the user 
 * wishes to insert an entity reference. 
 *
 * The expansion of the entity will appear as child nodes of the entity
 * reference node.  The expansion may be just simple text, or it may
 * be more complex, containing additional entity refs.
 *
*/

class CDOM_EXPORT DOM_EntityReference: public DOM_Node {
public:
    /** @name Constructors and assignment operator */
    //@{
    /**
      * Default constructor for DOM_EntityReference.  The resulting object does not
    * refer to an actual Entity Reference node; it will compare == to 0, and is similar
    * to a null object reference variable in Java.  It may subsequently be
    * assigned to refer to an actual entity reference node.
    * <p>
    * New entity reference nodes are created by DOM_Document::createEntityReference().
      *
      */
    DOM_EntityReference();

    /**
      * Copy constructor.  Creates a new <code>DOM_EntityReference</code> that refers to the
    * same underlying node as the original.  
      *
      * @param other The object to be copied.
      */
    DOM_EntityReference(const DOM_EntityReference &other);

    /**
      * Assignment operator.
      *
      * @param other The object to be copied.
      */
    DOM_EntityReference & operator = (const DOM_EntityReference &other);

    /**
      * Assignment operator.  This overloaded variant is provided for
      *   the sole purpose of setting a DOM_Node reference variable to
      *   zero.  Nulling out a reference variable in this way will decrement
      *   the reference count on the underlying Node object that the variable
      *   formerly referenced.  This effect is normally obtained when reference
      *   variable goes out of scope, but zeroing them can be useful for
      *   global instances, or for local instances that will remain in scope
      *   for an extended time,  when the storage belonging to the underlying
      *   node needs to be reclaimed.
      *
      * @param val.  Only a value of 0, or null, is allowed.
      */
    DOM_EntityReference & operator = (const DOM_NullPtr *val);

    //@}
    /** @name Destructor. */
    //@{
	 /**
	  * Destructor for DOM_EntityReference.  The object being destroyed is the reference
      * object, not the underlying entity reference node itself.
	  *
	  */
    ~DOM_EntityReference();
    //@}

private:
    DOM_EntityReference(EntityReferenceImpl *impl);

    friend class DOM_Document;
};

#endif