// -*- c++ -*-

/*
 * Jakelib2 - General purpose C++ library
 * Copyright (C) 2001 Florian Wolff  (florian@donuz.de)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: Stack.jlc,v 1.3 2003/09/27 08:10:29 florian Exp $
 */


#include "jakelib2.h"
#include "jakelib2/util/Stack.h"

using namespace jakelib::lang;
using namespace jakelib::util;

JAKELIB_IMPLEMENT_CLASS("jakelib.util.Stack", Stack, ArrayList)


/*****************************************************************************\
 * Stack                                                                      |
 *****************************************************************************/
Stack::Stack(int initialCapacity) 
  : ArrayList(initialCapacity)
{}


/*****************************************************************************\
 * empty                                                                      |
 *****************************************************************************/
jboolean Stack::empty()
{
  return (elementCount == 0);
}


/*****************************************************************************\
 * peek                                                                       |
 *****************************************************************************/
Object* Stack::peek()
{
  if (elementCount > 0)
    return get(elementCount -1);
  else
    return null;
}


/*****************************************************************************\
 * push                                                                       |
 *****************************************************************************/
void Stack::push(Object* obj)
{
  add(obj);
}


/*****************************************************************************\
 * pop                                                                        |
 *****************************************************************************/
Object* Stack::pop()
{
  if (elementCount > 0) {
    Object* obj = get(elementCount -1);
    removeLastElement();
    return obj;
  }
  else
    return null;
}