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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 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();
      private:
         void configureFieldManager(G4FieldManager * fM);
         void configurePropagatorInField(G4PropagatorInField * fP);  
      private:
         std::auto_ptr<Field> theField;
         G4Mag_UsualEqRhs * theFieldEquation;
         G4LogicalVolume* theTopVolume;
         
         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

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