// -*-C++-*- 

/*  inc/containers/LayeredContainer.hpp  */

/*
 * Author: Philogelos A. <Philogelos@yahoo.com>
 * Maintainer: Philogelos A.
 * Keywords: C++, library, containers
 *
 * Copyright (C) 1998, 1999 Philogelos A.
 *
 * This file is part of Quercus Robusta.
 *
 * Quercus Robusta is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this software; see the file COPYING.LIB.  If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 */



#ifndef __LAYEREDCONTAINER_HPP__
#define __LAYEREDCONTAINER_HPP__

/* $Id: LayeredContainer.hpp,v 1.2 1999/03/03 19:09:10 philogelos Exp $ */

#include "Container.hpp"
#include "Position.hpp"
#include "defines.h"

class LayeredEnumeration;
/**
   Stub for container implemented on the top
   of other container (e.g., the stack on top 
   of the list etc.).

   @author Philogelos
   @created
*/
abstract class LayeredContainer : public virtual Container
{
  friend LayeredEnumeration;

public:    virtual PositionEnumeration *getEnumeration() const;
public:    virtual boolean isEmpty() const;
public:    virtual Index getCardinality() const;

public: Top * getValue( const Position *aPosition );

protected: virtual Container *getBaseContainer() const = 0;
protected: virtual Position  *createFromBase( Position *aBasePosition );
};

class LayeredEnumeration : public PositionEnumeration,
						   public virtual Object
{
public: LayeredEnumeration( LayeredContainer *aContainer );
public: virtual ~LayeredEnumeration();

public: virtual Position *getNextPosition();
public: virtual boolean hasMoreElements();

protected: PositionEnumeration *baseEnum;
protected: LayeredContainer *baseContainer;
};

/* $Log: LayeredContainer.hpp,v $
 * Revision 1.2  1999/03/03 19:09:10  philogelos
 * Put sources under GNU Library License
 *
 * Revision 1.1  1999/02/28 13:04:32  philogelos
 * Added Files:
 * 	EmptyContainer.hpp EmptyStack.hpp LayeredContainer.hpp
 * 	MutableLayeredContainer.hpp PuncturedContainer.hpp Stack.hpp
 * 	TextContainer.hpp ValuePosition.hpp
 * Removed Files:
 * 	Modifier.hpp
 * */

/* __LAYEREDCONTAINER_HPP__ */
#endif