OMKValuedEventListenerCallBack.h

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/*
 * This file is part of openMask © INRIA, CNRS, Universite de Rennes 1 1993-2002, thereinafter the Software
 * 
 * The Software has been developped within the Siames Project. 
 * INRIA, the University of Rennes 1 and CNRS jointly hold intellectual property rights
 * 
 * The Software has been registered with the Agence pour la Protection des
 * Programmes (APP) under registration number IDDN.FR.001.510008.00.S.P.2001.000.41200
 *
 * This file may be distributed under the terms of the Q Public License
 * version 1.0 as defined by Trolltech AS of Norway and appearing in the file
 * LICENSE.QPL included in the packaging of this file.
 *
 * Licensees holding valid specific licenses issued by INRIA, CNRS or Université de Rennes 1 
 * for the software may use this file in accordance with that specific license 
 *
 */
#ifndef ValuedEventListenerCallBackHEADER
#define ValuedEventListenerCallBackHEADER

#include "OMKEvent.h"
#include "OMKEventListener.h"
#include "OMKSimulatedObject.h"

#include <typeinfo>

namespace OMK
{
template< class CallerClass, class PrmType >
class ValuedEventListenerCallBack :
  public EventListener
{
public:
  typedef bool (CallerClass::*CallBackFct)( ValuedEvent<PrmType> * event ) ;











  ValuedEventListenerCallBack( CallerClass & owner, 
                                 CallBackFct callBackFct, 
                                 const EventIdentifier& eventId )
  : EventListener( owner ), _callerInstance( &owner ), _callBackFct( callBackFct ), _eventId( eventId )
  { 
    // The owner instance and the call back method must be set
    OMASSERTM( _callerInstance && _callBackFct, "Needs a valid instance and call back method of this instance" ); 
    _owner.addEventListener( *this ) ;     
  }
  ValuedEventListenerCallBack( SimulatedObject & owner, 
                                 CallerClass * callerInstance, CallBackFct callBackFct, 
                                 const EventIdentifier& eventId )
  : EventListener( owner ), _callerInstance( callerInstance ), _callBackFct( callBackFct ), _eventId( eventId )
  { 
    // The owner instance and the call back method must be set
    OMASSERTM( _callerInstance && _callBackFct, "Needs a valid instance and call back method of this instance" ); 
    _owner.addEventListener( *this ) ;     
  }
  virtual ~ValuedEventListenerCallBack() {}

protected:





  virtual bool processEvent( Event *e ) 
  {
    ValuedEvent< PrmType > *valuedEvent = dynamic_cast< ValuedEvent< PrmType >* >( e ) ;
    if( valuedEvent )
    { // Ok => call the call back method
      return (_callerInstance->*_callBackFct)( valuedEvent ) ;
    }
    else
    { // Unable to cast => error message
      OMERROR( ":-( Error to processEvent() of " << debugMsg( &_owner ) << " with the event \"" 
                << ( e ? e->eventId.getCString() : "unknow" ) << "\" send by \"" 
                << ( e ? e->sender.getCString() : "unknow" ) << "\"" << std::endl
                << ">>> Unable to cast the event (waits " << typeid( valuedEvent ).name() << " get " << typeid( e ).name() ) ;
      return false ; // Unable to process the event => don't stop the process, maybe something else could process it.
    }
  }
  virtual void registerEvents() 
  {
    _owner.registerEventListenerForEvent( *this, _eventId ) ;
  }
  
protected:



  CallerClass* _callerInstance ;
  CallBackFct _callBackFct ;
  EventIdentifier _eventId ;
};

} //namespace OMK

#endif //defined ValuedEventListenerCallBackHEADER

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