// -------------------------------------------------------------------------
// -----                   CbmSttVertexFitter header file              -----
// -----                  Created 18/02/05  by V. Friese               -----
// -------------------------------------------------------------------------


/** CbmSttVertexFitter
 *@author V.Friese <v.friese@gsi.de>
 **
 ** Abstract base class for concrete STT vertex fitting algorithm.
 ** Each derived class must implement the method DoFit. This has
 ** to operate on an object of type CbmSttTrack and fill the
 ** parameters fPidHypo, fParamFirst, fParamLast, fFlag and fChi2.
 **/

#ifndef CBMSTTVERTEXFITTER
#define CBMSTTVERTEXFITTER 

#include "TObject.h"
#include "CbmSttVertex.h"

class TClonesArray;

class CbmSttVertexFitter : public TObject
{
 public:
  /** Default constructor **/
  CbmSttVertexFitter() { };


  /** Destructor **/
  virtual ~CbmSttVertexFitter() { };


  /** Virtual method Init. If needed, to be implemented in the
   ** concrete class. Else no action.
   **/
  virtual void Init() { };


  /** Abstract method DoFit. To be implemented in the concrete class.
   ** Task: Make a fit to the hits attached to the track by the track
   ** finder. Fill the track parameter member variables.
   **
   *@param pTrack      Pointer to CbmSttTrack
   *@param pidHypo     PID hypothesis for the fit. Default is pion.
   **/
  virtual Int_t DoFit(CbmSttVertex* pVertex) = 0;

  ClassDef(CbmSttVertexFitter,1);

};

#endif