/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/MagneticField/VolumeGeometry/interface/MagneticFieldProvider.h

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#ifndef MagneticFieldProvider_h
#define MagneticFieldProvider_h

#include "DataFormats/GeometryVector/interface/Point3DBase.h"
#include "DataFormats/GeometryVector/interface/Vector3DBase.h"
#include "DataFormats/GeometryVector/interface/LocalTag.h"
#include "DataFormats/GeometryVector/interface/GlobalTag.h"

template <class T>
class MagneticFieldProvider {
public:

  typedef Point3DBase<T,GlobalTag>      GlobalPointType;
  typedef Point3DBase<T,LocalTag>       LocalPointType;
  typedef Vector3DBase<T,GlobalTag>     GlobalVectorType;
  typedef Vector3DBase<T,LocalTag>      LocalVectorType;


  virtual ~MagneticFieldProvider(){}

  virtual LocalVectorType valueInTesla( const LocalPointType& p) const = 0;

  // virtual GlobalVectorType valueInTesla( const GlobalPointType& p) const = 0;

  virtual int hasDerivatives() const {return false;}

  virtual LocalVectorType derivativeInTeslaPerMeter( const LocalPointType& p, 
                                                     int N) const {
    return LocalVectorType();
  }

};

#endif