/data/refman/pasoursint/CMSSW_5_3_3/src/TrackingTools/GsfTracking/interface/GsfMaterialEffectsUpdator.h

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#ifndef GsfMaterialEffectsUpdator_h_
#define GsfMaterialEffectsUpdator_h_

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

#include <vector>

class GsfMaterialEffectsUpdator
{  
public:
  GsfMaterialEffectsUpdator ( float mass ) :
    theMass(mass) {}

  virtual ~GsfMaterialEffectsUpdator () {}

  virtual TrajectoryStateOnSurface updateState (const TrajectoryStateOnSurface& TSoS, 
                                                const PropagationDirection propDir) const;
  virtual std::vector<double> weights (const TrajectoryStateOnSurface& TSoS, 
                                       const PropagationDirection propDir) const {
    // check for material
    if ( !TSoS.surface().mediumProperties() )  return std::vector<double>();
    // check for change (avoid using compute method if possible)
    if ( newArguments(TSoS,propDir) )  compute(TSoS,propDir);
    return theWeights;
  }
  virtual std::vector<double> deltaPs (const TrajectoryStateOnSurface& TSoS, 
                                       const PropagationDirection propDir) const {
    // check for material
    if ( !TSoS.surface().mediumProperties() )  return std::vector<double>();
    // check for change (avoid using compute method if possible)
    if ( newArguments(TSoS,propDir) )  compute(TSoS,propDir);
    return theDeltaPs;
  }
  virtual std::vector<AlgebraicSymMatrix55> deltaLocalErrors (const TrajectoryStateOnSurface& TSoS, 
                                                            const PropagationDirection propDir) const {
    // check for material
    if ( !TSoS.surface().mediumProperties() )  return std::vector<AlgebraicSymMatrix55>();
    // check for change (avoid using compute method if possible)
    if ( newArguments(TSoS,propDir) )  compute(TSoS,propDir);
    return theDeltaCovs;
  }  
  inline float mass () const {
    return theMass;
  }

  virtual GsfMaterialEffectsUpdator* clone()  const = 0;

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

protected:
  // check of arguments for use with cached values
  virtual bool newArguments (const TrajectoryStateOnSurface&, const PropagationDirection) const {
    return true;
  }
  // storage of arguments for later use
  virtual void storeArguments (const TrajectoryStateOnSurface&, const PropagationDirection) const {
  }
  
private:
  float theMass;


protected:  
  mutable std::vector<double> theWeights;
  mutable std::vector<double> theDeltaPs;
  mutable std::vector<AlgebraicSymMatrix55> theDeltaCovs;
};

#endif