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

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#ifndef Alignment_ReferenceTrajectories_ReferenceTrajectoryBase_H
#define Alignment_ReferenceTrajectories_ReferenceTrajectoryBase_H

#include "DataFormats/GeometrySurface/interface/ReferenceCounted.h"

// for AlgebraicVector, -Matrix and -SymMatrix:
#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"
#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHit.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/TrajectoryParametrization/interface/LocalTrajectoryError.h"

#include <vector>

class ReferenceTrajectoryBase : public ReferenceCounted
{

public:

  typedef ReferenceCountingPointer<ReferenceTrajectoryBase> ReferenceTrajectoryPtr;

  enum MaterialEffects { none, multipleScattering, energyLoss, combined, 
                         breakPoints, brokenLinesCoarse, brokenLinesFine };

  virtual ~ReferenceTrajectoryBase() {}

  bool isValid() { return theValidityFlag; }

  const AlgebraicVector& measurements() const { return theMeasurements; }

  const AlgebraicSymMatrix& measurementErrors() const { return theMeasurementsCov; }
  
  const AlgebraicVector& trajectoryPositions() const { return theTrajectoryPositions; }

  const AlgebraicSymMatrix& trajectoryPositionErrors() const { return theTrajectoryPositionCov; }

  const AlgebraicMatrix& derivatives() const { return theDerivatives; }

  const AlgebraicMatrix& trajectoryToCurv() const { return theInnerTrajectoryToCurvilinear; }
  const AlgebraicMatrix& localToTrajectory() const { return theInnerLocalToTrajectory; }    

  const AlgebraicVector& parameters() const { return theParameters; }

  inline bool parameterErrorsAvailable() const { return theParamCovFlag; }

  inline void setParameterErrors( const AlgebraicSymMatrix& error ) { theParameterCov = error; theParamCovFlag = true; }
  
  inline const AlgebraicSymMatrix& parameterErrors() const { return theParameterCov; }

  const std::vector<TrajectoryStateOnSurface>& trajectoryStates() const { return theTsosVec; }

  const TransientTrackingRecHit::ConstRecHitContainer& recHits() const { return theRecHits; }

  inline unsigned int numberOfHits() const { return theNumberOfHits; }
  inline unsigned int numberOfPar() const { return theNumberOfPars; }
  inline unsigned int numberOfVirtualMeas() const { return theNumberOfVirtualMeas; }  
  inline unsigned int numberOfVirtualPar() const { return theNumberOfVirtualPars; }  
  inline unsigned int numberOfHitMeas() const { return theNumberOfHits * nMeasPerHit; } 
     
  virtual ReferenceTrajectoryBase* clone() const = 0;

protected:

  explicit ReferenceTrajectoryBase(unsigned int nPar, unsigned int nHits,
                                   unsigned int nVirtualPar, unsigned int nVirtualMeas);

  unsigned int numberOfUsedRecHits(const TransientTrackingRecHit::ConstRecHitContainer &recHits) const;
  bool useRecHit(const TransientTrackingRecHit::ConstRecHitPointer& hitPtr) const;

  bool theValidityFlag;
  bool theParamCovFlag;

  unsigned int theNumberOfHits;   // number of (measurements from) hits
  unsigned int theNumberOfPars;   // number of (track) parameters
  unsigned int theNumberOfVirtualMeas; // number of virtual measurements
  unsigned int theNumberOfVirtualPars; // number of parameters for virtual measurements
      
  std::vector<TrajectoryStateOnSurface> theTsosVec;
  TransientTrackingRecHit::ConstRecHitContainer theRecHits;

  AlgebraicVector     theMeasurements;
  AlgebraicSymMatrix  theMeasurementsCov;

  AlgebraicVector     theTrajectoryPositions;
  AlgebraicSymMatrix  theTrajectoryPositionCov;

  AlgebraicVector     theParameters;
  AlgebraicSymMatrix  theParameterCov;

  AlgebraicMatrix     theDerivatives;

// CHK for beamspot   transformation trajectory parameter to curvilinear at refTSos
  AlgebraicMatrix     theInnerTrajectoryToCurvilinear;  
// CHK for TwoBodyD.  transformation local to trajectory parameter at refTsos
  AlgebraicMatrix     theInnerLocalToTrajectory;  
    
  static const unsigned int nMeasPerHit = 2;
};

#endif // REFERENCE_TRAJECTORY_BASE_H