LocalTrajectoryError.h

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#ifndef _TRACKER_LOCALTRAJECTORYERROR_H_
#define _TRACKER_LOCALTRAJECTORYERROR_H_

#include "DataFormats/GeometrySurface/interface/LocalError.h"
#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"

#include <boost/shared_ptr.hpp>

class LocalTrajectoryError {
public:
  // construct
  LocalTrajectoryError();
  // destruct
  ~LocalTrajectoryError();

  LocalTrajectoryError(const AlgebraicSymMatrix55& aCovarianceMatrix);

  LocalTrajectoryError(const AlgebraicSymMatrix& aCovarianceMatrix);

  LocalTrajectoryError( float dx, float dy, float dxdir, float dydir,
            float dpinv);

// access

  const AlgebraicSymMatrix55 &matrix() const {
    return theCovarianceMatrix;
  }

  const AlgebraicSymMatrix matrix_old() const {
    return asHepMatrix(theCovarianceMatrix);
  }

  const AlgebraicSymMatrix55 &weightMatrix() const;


  LocalTrajectoryError & operator *= (double factor) {
    theCovarianceMatrix *= factor;
    if ((theWeightMatrixPtr.get() != 0) && (factor != 0.0)) { (*theWeightMatrixPtr) /= factor; } 
    return *this;
  }

  LocalError positionError() const {
    return LocalError( theCovarianceMatrix(3,3),theCovarianceMatrix(3,4),
               theCovarianceMatrix(4,4));
  }

private:
  AlgebraicSymMatrix55 theCovarianceMatrix;
  mutable boost::shared_ptr<AlgebraicSymMatrix55> theWeightMatrixPtr;
};

#endif