Reconstruction/MdcPatRec/TrkBase/include/TrkBase/TrkExtInterface.h

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//--------------------------------------------------------------------------
// File and Version Information:
//      $Id: TrkExtInterface.h,v 1.1.1.1 2005/04/21 06:01:42 zhangy Exp $
//
// Description:
//     Abstract base class; derived classes enable TrkRecoTrk to give
// users access to representation-specific functions without having
// the functions in the RecoTrk interface.  Users create an object of
// of one of the derived TrkExtInterface classes and pass it to
// TrkRecoTrk::attach(), which will either accept it or reject it,
// depending on whether the TrkRep inside recognizes it.  Recognition
// is implemented by a simple equality test on the Rep's key.
//
// Environment:
//      Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author(s): Steve Schaffner
//
//------------------------------------------------------------------------
 
#ifndef TRKEXTINTERFACE_HH
#define TRKEXTINTERFACE_HH
 
class TrkRep;
class IfdKey;
 
// Class interface //
class TrkExtInterface {
 
public:
  TrkExtInterface();
  virtual ~TrkExtInterface();
  virtual bool attach( TrkRep* );
  virtual bool attach( const TrkRep* );
  bool         isAttached() const { return _myRep != 0; }
  bool         nonConstAttachment() const { return _nonconst; }
 
protected:
  TrkRep*               myRep();
  const TrkRep*         myConstRep() const;
  virtual const IfdKey& myKey() const = 0;
  void                  setRep( const TrkRep* );
  void                  setRep( TrkRep* );
 
private:
  TrkRep* _myRep;
  bool    _nonconst; // keep track of whether we attached const or not
                     // Preempt
  TrkExtInterface& operator=( const TrkExtInterface& );
  TrkExtInterface( const TrkExtInterface& );
};
 
#endif