PresamplerGeometry.h

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
// LArG4::EC::PresamplerGeometry
 
// This class contains the geometry calculations needed to calculate
// an identifier for a given G4Step.
 
// 17-Aug-2004: Mikhail Leltchouk wrote the original code, Bill
// Seligman revised it for current use.
 
// Note: This class is intended for use in calculating identifiers in
// both active and inactive regions of the detector.  For calibration
// studies, it must work properly whether the energy is deposited in
// the liquid argon or the absorber.
 
#ifndef LArG4_EC_PresamplerGeometry_H
#define LArG4_EC_PresamplerGeometry_H
#include "LArG4EC/IECPresamplerGeometry.h"
#include "AthenaBaseComps/AthService.h"
 
// Forward declarations.
class LArG4Identifier;
class G4Step;
 
// Note the use of nested namespaces (mainly to prevent long names
// like LArG4HECGeometry).  This class is contained in the namespace
// LArG4::EC.
 
namespace LArG4 {
 
  namespace EC {
 
    class PresamplerGeometry: public extends<AthService, IECPresamplerGeometry> {
 
    public:
      // Constructor
      PresamplerGeometry(const std::string& name, ISvcLocator * pSvcLocator);
      StatusCode initialize() override final;
      virtual ~PresamplerGeometry();
 
      // 15-Jan-2002 WGS: A "lookup" function for detector measurements,
      // sizes, and other values.
      enum kValue {
        rMinEndcapPresampler,
        rMaxEndcapPresampler,
        zEndcapPresamplerFrontFace,
        zEndcapPresamplerBackFace,
        EndcapPresamplerHalfThickness,
        EndcapPresamplerZpositionInMother
      };
      // This is the "meat" of this class: calculate the identifier
      // given a G4Step.
      LArG4Identifier CalculateIdentifier( const G4Step* ) const override final;
 
    private:
 
      double GetValue(const kValue) const;
 
      struct Clockwork;
      Clockwork *m_c; //FIXME is it really worth creating this struct on the heap?
 
      PresamplerGeometry (const PresamplerGeometry&);
      PresamplerGeometry& operator= (const PresamplerGeometry&);
    };
 
  } // namespace EC
 
} // namespace LArG4
 
#endif // LArG4_EC_PresamplerGeometry_H