/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h

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#ifndef _TRACKER_FREETRAJECTORYSTATE_H_
#define _TRACKER_FREETRAJECTORYSTATE_H_

// base trajectory state class
// track parameters and error covariance matrix

#include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
#include "TrackingTools/TrajectoryParametrization/interface/CartesianTrajectoryError.h"
#include "TrackingTools/TrajectoryParametrization/interface/CurvilinearTrajectoryError.h"
#include "DataFormats/TrajectoryState/interface/TrackCharge.h"
#include "TrackingTools/TrajectoryParametrization/interface/TrajectoryStateExceptions.h"

#include <iosfwd>


#include "FWCore/Utilities/interface/Visibility.h"
#include "FWCore/Utilities/interface/Likely.h"


class FreeTrajectoryState  {
public:
// construst
//default constructor - needed for Persistency

  FreeTrajectoryState():  
    theCurvilinearError(InvalidError()) {}
  
  FreeTrajectoryState(const GlobalTrajectoryParameters& aGlobalParameters) :
  theGlobalParameters(aGlobalParameters),  
  theCurvilinearError(InvalidError())
  {}
  
  FreeTrajectoryState(const GlobalPoint& aX,
                      const GlobalVector& aP,
                      TrackCharge aCharge, 
                      const MagneticField* fieldProvider) :
    theGlobalParameters(aX, aP, aCharge, fieldProvider),  
    theCurvilinearError(InvalidError())
  {}
  
  
  FreeTrajectoryState(const GlobalTrajectoryParameters& aGlobalParameters,
                      const CurvilinearTrajectoryError& aCurvilinearError) :
    theGlobalParameters(aGlobalParameters),
    theCurvilinearError(aCurvilinearError)
  {}
  
  
  
  FreeTrajectoryState(const GlobalTrajectoryParameters& aGlobalParameters,
                      const CartesianTrajectoryError& aCartesianError) :
    theGlobalParameters(aGlobalParameters)
  { createCurvilinearError(aCartesianError);  }

  FreeTrajectoryState(const GlobalTrajectoryParameters& aGlobalParameters,
                      const CartesianTrajectoryError&,
                      const CurvilinearTrajectoryError& aCurvilinearError) :
    theGlobalParameters(aGlobalParameters),
    theCurvilinearError(aCurvilinearError)  
  {}
  
// access
// propagate access to parameters
  GlobalPoint position() const {
    return theGlobalParameters.position();
  }
  GlobalVector momentum() const {
    return theGlobalParameters.momentum();
  }
  TrackCharge charge() const {
    return theGlobalParameters.charge();
  }
  double signedInverseMomentum() const {
    return theGlobalParameters.signedInverseMomentum();
  }
  double transverseCurvature() const {
    return theGlobalParameters.transverseCurvature();
  }

// direct access

  bool hasCurvilinearError() const {return theCurvilinearError.valid();}

  bool hasError() const {
    return hasCurvilinearError();
  }


  const GlobalTrajectoryParameters& parameters() const {
    return theGlobalParameters;
  }


  CartesianTrajectoryError cartesianError() const {
    if unlikely(!hasError()) missingError();
    CartesianTrajectoryError aCartesianError;
    createCartesianError(aCartesianError);
    return aCartesianError;
  }

  const CurvilinearTrajectoryError& curvilinearError() const {
    if  unlikely(!hasError()) missingError();
    return theCurvilinearError;
  }

  void rescaleError(double factor);


  void setCartesianError(const CartesianTrajectoryError &err) {
    createCurvilinearError(err);
  }
  void setCartesianError(const AlgebraicSymMatrix66 &err) {
    createCurvilinearError(CartesianTrajectoryError(err)); 
  }

  void setCurvilinearError(const CurvilinearTrajectoryError &err) {
        theCurvilinearError = err;
  }
  void setCurvilinearError(const AlgebraicSymMatrix55 &err) {
        theCurvilinearError = CurvilinearTrajectoryError(err); 
  }

private:


  void missingError() const; // dso_internal;

// convert curvilinear errors to cartesian
  void createCartesianError(CartesianTrajectoryError & aCartesianError) const; // dso_internal;


// convert cartesian errors to curvilinear
  void createCurvilinearError(CartesianTrajectoryError const & aCartesianError) const; // dso_internal;

private:

  GlobalTrajectoryParameters  theGlobalParameters;
  mutable CurvilinearTrajectoryError  theCurvilinearError;
 
};

std::ostream& operator<<(std::ostream& os, const FreeTrajectoryState& fts);

#endif