/home/tobi/workspace/solarpowerlog/src/patterns/IObserverObserver.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 (IObserverObserver.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 <stddef.h>
#include "IObserverObserver.h"
#include "IObserverSubject.h"

using namespace std;

IObserverObserver::IObserverObserver(IObserverSubject *subject) {

     /* auto-subscribe */
     if (subject != NULL) setSubject(subject);
}

IObserverObserver::~IObserverObserver() {

     /* auto-unsubsribe */
     if (subject) subject->UnSubscribe(this);
     // TODO Auto-generated destructor stub
}

IObserverSubject *IObserverObserver::getSubject() const
 {
     return subject;
 }

 void IObserverObserver::setSubject(IObserverSubject *subject)
 {
      if(this->subject == subject) return;
      if(this->subject) subject->UnSubscribe(this);
     this->subject = subject;
     subject->Subscribe(this);
 }