/*
 * 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 01:05:03  twl
 * Initial revision
 *
 * Revision 1.2  1999/11/08 20:45:13  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */

#if !defined(REFSTACKOF_HPP)
#define REFSTACKOF_HPP


#include <util/XML4CDefs.hpp>
#include <util/ArrayIndexOutOfBoundsException.hpp>
#include <util/EmptyStackException.hpp>
#include <util/RefVectorOf.hpp>
#include <util/XMLEnumerator.hpp>


//
//  Forward declare the enumerator so he can be our friend. Can you say
//  friend? Sure...
//
template <class TElem> class RefStackEnumerator;


template <class TElem> class RefStackOf
{
public :
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    RefStackOf(const unsigned int initElems, const bool adoptElems = true);
    ~RefStackOf();


    // -----------------------------------------------------------------------
    //  Element management methods
    // -----------------------------------------------------------------------
    const TElem* elementAt(const unsigned int index) const;
    void push(TElem* const toPush);
    const TElem* peek() const;
    TElem* pop();
    void removeAllElements();


    // -----------------------------------------------------------------------
    //  Getter methods
    // -----------------------------------------------------------------------
    bool empty();
    unsigned int curCapacity();
    unsigned int size();


private :
    // -----------------------------------------------------------------------
    //  Declare our friends
    // -----------------------------------------------------------------------
    friend class RefStackEnumerator<TElem>;


    // -----------------------------------------------------------------------
    //  Data Members
    //
    //  fVector
    //      The vector that is used as the backing data structure for the
    //      stack.
    // -----------------------------------------------------------------------
    RefVectorOf<TElem>  fVector;
};


//
//  An enumerator for a value stack. It derives from the basic enumerator
//  class, so that value stacks can be generically enumerated.
//
template <class TElem> class RefStackEnumerator : public XMLEnumerator<TElem>
{
public :
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    RefStackEnumerator
    (
                RefStackOf<TElem>* const    toEnum
        , const bool                        adopt = false
    );
    ~RefStackEnumerator();


    // -----------------------------------------------------------------------
    //  Enum interface
    // -----------------------------------------------------------------------
    bool hasMoreElements() const;
    TElem& nextElement();
    void Reset();


private :    
    // -----------------------------------------------------------------------
    //  Data Members
    //
    //  fAdopted
    //      Indicates whether we have adopted the passed stack. If so then
    //      we delete the stack when we are destroyed.
    //
    //  fCurIndex
    //      This is the current index into the vector inside the stack being
    //      enumerated.
    //
    //  fToEnum
    //      The stack that is being enumerated. This is just kept for
    //      adoption purposes, since we really are enumerating the vector
    //      inside of it.
    // -----------------------------------------------------------------------
    bool                fAdopted;
    unsigned int        fCurIndex;
    RefVectorOf<TElem>* fVector;
    RefStackOf<TElem>*  fToEnum;
};


#if !defined(XML4C_TMPLSINC)
#include <util/RefStackOf.c>
#endif

#endif