FieldBuilder.h

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#ifndef SimG4Core_FieldBuilder_H
#define SimG4Core_FieldBuilder_H

#include "FWCore/ParameterSet/interface/ParameterSet.h"
// #include "SimG4Core/Geometry/interface/G4LogicalVolumeToDDLogicalPartMap.h"
#include <memory>

// class DDLogicalPart;
class MagneticField;

class G4FieldManager;
class G4ChordFinder;
class G4Mag_UsualEqRhs;
class G4PropagatorInField;
class G4LogicalVolume;

namespace sim {
  class Field;
  class FieldBuilder {
  public:
    FieldBuilder(const MagneticField*, const edm::ParameterSet&);
    //~FieldBuilder();

    /*
      void readFieldParameters(DDLogicalPart theLogicalPart,
                               const std::string& keywordField);
    */
    void build(G4FieldManager* fM = 0,
           G4PropagatorInField* fP = 0) ;

    /*
      void configure(const std::string& keywordField,
             G4FieldManager * fM = 0,
             G4PropagatorInField * fP = 0);
    */
    void configureForVolume( const std::string& volName, 
                 edm::ParameterSet& volPSet,
                 G4FieldManager * fM = 0,
                 G4PropagatorInField * fP = 0);
    G4LogicalVolume * fieldTopVolume();
    void setStepperAndChordFinder (G4FieldManager * fM, int val);

  private:
    void configureFieldManager(G4FieldManager * fM);
    void configurePropagatorInField(G4PropagatorInField * fP);  
  private:
    std::auto_ptr<Field> theField;
    G4Mag_UsualEqRhs *theFieldEquation;
    G4LogicalVolume  *theTopVolume;
    G4ChordFinder    *fChordFinder, *fChordFinderMonopole;
     
    std::string keywordField;
    std::string fieldType;
    double fieldValue;
    std::string stepper;
    double minStep;
    double dChord;
    double dOneStep;
    double dIntersection;
    double dIntersectionAndOneStep;
    double maxLoopCount;
    double minEpsilonStep;
    double maxEpsilonStep;
    edm::ParameterSet thePSet ;
  };
}

#endif