MaterialEffectsUpdator.h

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#ifndef _CR_MATERIALEFFECTSUPDATOR_H_
#define _CR_MATERIALEFFECTSUPDATOR_H_

#include "DataFormats/GeometrySurface/interface/Surface.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"

namespace materialEffect {
  enum CovIndex { elos=0, msxx=1, msxy=2, msyy=3};
  class Covariance {
  public:
    float operator[](CovIndex i) const { return data[i];}
    float & operator[](CovIndex i) { return data[i];}
    void add(AlgebraicSymMatrix55 & cov) const {
      cov(0,0) += data[elos];
      cov(1,1) += data[msxx];
      cov(1,2) += data[msxy];
      cov(2,2) += data[msyy];

    }
    Covariance & operator+=(Covariance const & cov) {
      for(int i=0;i!=4;++i) data[i]+=cov.data[i];
      return *this;
    }
  private:
    float data[4]={0};
  };

  struct Effect {
    float weight=1.f;
    // Change in |p| from material effects.
    float deltaP=0;
    // Contribution to covariance matrix (in local co-ordinates) from material effects.
    Covariance deltaCov;
    void combine(Effect const & e1,Effect const & e2) {
      weight *= e1.weight*e2.weight;
      deltaP+=e1.deltaP+e2.deltaP;
      deltaCov+=e1.deltaCov; deltaCov+=e2.deltaCov;
    } 
  };

}

class MaterialEffectsUpdator {  
public:
  typedef materialEffect::Covariance Covariance;
  typedef materialEffect::Effect Effect;
  typedef  materialEffect::CovIndex CovIndex;

  MaterialEffectsUpdator ( float mass );
  virtual ~MaterialEffectsUpdator ();

  virtual TrajectoryStateOnSurface updateState (const TrajectoryStateOnSurface& TSoS, 
                        const PropagationDirection propDir) const;

  virtual bool updateStateInPlace (TrajectoryStateOnSurface& TSoS, 
                   const PropagationDirection propDir) const;



  inline float mass () const {
    return theMass;
  }

  virtual MaterialEffectsUpdator* clone()  const = 0;

  // here comes the actual computation of the values
  virtual void compute (const TrajectoryStateOnSurface&, const PropagationDirection, Effect & effect) const = 0;
 
 private:
  float theMass;

};

#endif