/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/IOMC/EventVertexGenerators/interface/BaseEvtVtxGenerator.h

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#ifndef IOMC_BaseEvtVtxGenerator_H
#define IOMC_BaseEvtVtxGenerator_H
/*
*   $Date: 2012/01/17 11:58:52 $
*   $Revision: 1.9 $
*/

#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "TMatrixD.h"

/*
namespace HepMC {
   class GenEvent;
}
*/

namespace HepMC {
   class FourVector ;
}

namespace CLHEP {
   //class Hep3Vector;
   class HepRandomEngine;
}

class BaseEvtVtxGenerator : public edm::EDProducer
{
   public:
      
   // ctor & dtor
   explicit BaseEvtVtxGenerator( const edm::ParameterSet& );
   virtual ~BaseEvtVtxGenerator();
      
   virtual void produce( edm::Event&, const edm::EventSetup& );
   virtual void beginRun( edm::Run & , const edm::EventSetup&) {};

   //virtual CLHEP::Hep3Vector* newVertex() = 0;
   virtual HepMC::FourVector* newVertex() = 0 ;
   //virtual CLHEP::Hep3Vector* lastVertex() { return fVertex; }
   virtual HepMC::FourVector* lastVertex() { return fVertex; }
   
   virtual TMatrixD* GetInvLorentzBoost() = 0;
   
   protected:

   // Returns a reference to encourage users to use a reference
   // when initializing CLHEP distributions.  If a pointer
   // is used, then the distribution thinks it owns the engine
   // and will delete the engine when the distribution is destroyed
   // (a big problem since the distribution does not own the memory).
   CLHEP::HepRandomEngine& getEngine();

   //CLHEP::Hep3Vector*       fVertex;
   HepMC::FourVector*       fVertex ;
   TMatrixD *boost_;
   double fTimeOffset;
   
   private :

   CLHEP::HepRandomEngine*  fEngine;
   edm::InputTag            sourceLabel;
   
};

#endif