/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/Alignment/ReferenceTrajectories/interface/TwoBodyDecayTrajectory.h

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#ifndef Alignment_ReferenceTrajectories_TwoBodyDecayTrajectory_h
#define Alignment_ReferenceTrajectories_TwoBodyDecayTrajectory_h

#include "Alignment/ReferenceTrajectories/interface/ReferenceTrajectory.h"
#include "Alignment/ReferenceTrajectories/interface/TwoBodyDecayTrajectoryState.h"


namespace reco { class BeamSpot; }

class TwoBodyDecayTrajectory : public ReferenceTrajectoryBase
{

public:

  typedef TransientTrackingRecHit::ConstRecHitContainer ConstRecHitContainer;
  typedef std::pair< ConstRecHitContainer, ConstRecHitContainer > ConstRecHitCollection;

  TwoBodyDecayTrajectory( const TwoBodyDecayTrajectoryState & trajectoryState,
                          const ConstRecHitCollection & recHits,
                          const MagneticField* magField,
                          MaterialEffects materialEffects,
                          PropagationDirection propDir,
                          bool hitsAreReverse,
                          const reco::BeamSpot &beamSpot,
                          bool useRefittedState,
                          bool constructTsosWithErrors );

  TwoBodyDecayTrajectory( void );

  ~TwoBodyDecayTrajectory( void ) {}

  virtual TwoBodyDecayTrajectory* clone( void ) const
    { return new TwoBodyDecayTrajectory( *this ); }

  inline const std::pair< int, int > numberOfRecHits( void ) { return theNumberOfRecHits; }

private:

  bool construct( const TwoBodyDecayTrajectoryState & state,
                  const ConstRecHitCollection & recHits,
                  const MagneticField* field,
                  MaterialEffects materialEffects,
                  PropagationDirection propDir,
                  const reco::BeamSpot &beamSpot,
                  bool useRefittedState,
                  bool constructTsosWithErrors );

  void constructTsosVecWithErrors( const ReferenceTrajectory& traj1,
                                   const ReferenceTrajectory& traj2,
                                   const MagneticField* field );

  void constructSingleTsosWithErrors( const TrajectoryStateOnSurface & tsos,
                                      int iTsos,
                                      const MagneticField* field );

  std::pair< int, int > theNumberOfRecHits;

};

#endif