/home/tobi/workspace/solarpowerlog/src/patterns/IObserverSubject.h

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/* ----------------------------------------------------------------------------
 solarpowerlog
 Copyright (C) 2009  Tobias Frost

 This file is part of solarpowerlog.

 Solarpowerlog is free software; However, it is dual-licenced
 as described in the file "COPYING".

 For this file (IObserverSubject.h), the license terms are:

 You can redistribute it and/or  modify it under the terms of the GNU Lesser
 General Public License (LGPL) as published by the Free Software Foundation;
 either version 3 of the License, or (at your option) any later version.

 This program 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 Library General Public
 License along with this proramm; if not, see
 <http://www.gnu.org/licenses/>.
 ----------------------------------------------------------------------------
 */

#ifndef OBSERVERSUBJECT_H_
#define OBSERVERSUBJECT_H_

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <list>

using namespace std;

class IObserverObserver;

class IObserverSubject
{
public:

     virtual ~IObserverSubject();

     virtual void Subscribe( class IObserverObserver* observer );

     virtual void UnSubscribe( class IObserverObserver* observer );

     virtual void SetSubscription( class IObserverObserver* observer,
          bool subscribe = true );

     virtual bool CheckSubscription( class IObserverObserver *observer );

     virtual void Notify( void );

     virtual unsigned int GetNumSubscribers( void );

protected:
     IObserverSubject();

private:
     std::list<IObserverObserver*> listobservers;

};

#endif /* OBSERVERSUBJECT_H_ */

/*
 Infos on pattern
 See:
 http://www.cs.clemson.edu/~malloy/courses/patterns/observerCo.html
 */