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

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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.cpp), the license terms are:

 You can redistribute it and/or modify it under the terms of the GNU
 General Public License 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/>.
 ----------------------------------------------------------------------------
 */

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

#include "IObserverSubject.h"
#include "IObserverObserver.h"
#include <list>

using namespace std;

void IObserverSubject::Subscribe( class IObserverObserver *observer )
{
     if (!CheckSubscription(observer))
          listobservers.push_back(observer);
}

void IObserverSubject::UnSubscribe( class IObserverObserver *observer )
{
     if (CheckSubscription(observer))
          listobservers.remove(observer);
}

void IObserverSubject::Notify( void )
{
     std::list<class IObserverObserver *>::iterator i;
     for (i = listobservers.begin(); i != listobservers.end(); ++i) {
          (*i)->Update(this);
     }
}

unsigned int IObserverSubject::GetNumSubscribers( void )
{
     return listobservers.size();
}

bool IObserverSubject::CheckSubscription( class IObserverObserver *observer )
{
     std::list<class IObserverObserver *>::iterator i;
     for (i = listobservers.begin(); i != listobservers.end(); ++i) {
          if ((*i) == observer)
               return true;
     }

     return false;
}

void IObserverSubject::SetSubscription( class IObserverObserver *observer,
     bool subscribe )
{
     if (subscribe)
          Subscribe(observer);
     else
          UnSubscribe(observer);
}

IObserverSubject::IObserverSubject()
{
     // TODO Auto-generated constructor stub

}

IObserverSubject::~IObserverSubject()
{
     listobservers.empty();
     // TODO Auto-generated destructor stub
}