LArVoxelReadoutGeometry.h

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#ifndef LArG4_LArVoxelReadoutGeometry_h
#define LArG4_LArVoxelReadoutGeometry_h

#include "Geant4/G4String.hh"
#include "Geant4/G4Transform3D.hh"
#include "Geant4/G4UserLimits.hh"
#include "Geant4/G4VUserParallelWorld.hh"
#include "larcore/Geometry/Geometry.h"
#include "larsim/LegacyLArG4/LArVoxelReadout.h"

// Forward declarations
class G4PhysicalVolume;

namespace larg4 {

  class LArVoxelReadoutGeometry : public G4VUserParallelWorld {
  public:
    struct Setup_t {

      geo::GeometryCore const* geometry;
      geo::WireReadoutGeom const* wireReadoutGeom;
      sim::LArG4Parameters const* larG4Params;
      larg4::LArVoxelReadout::Setup_t readoutSetup;

    }; // struct Setup_t

    LArVoxelReadoutGeometry(const G4String& name, Setup_t const& setupData);

    class Sentry;

    void Construct() override;

  private:
    G4VPhysicalVolume* FindNestedVolume(G4VPhysicalVolume* mother,
                                        G4Transform3D& motherTransform,
                                        G4Transform3D& daughterTransform,
                                        std::string const& daughterName,
                                        unsigned int expectedNum);

    std::unique_ptr<G4UserLimits> fStepLimit; 

    larg4::LArVoxelReadout* flarVoxelReadout{nullptr};
    geo::GeometryCore const* fGeom;
    geo::WireReadoutGeom const* fWireReadoutGeom;
    sim::LArG4Parameters const* fLgp;
    larg4::LArVoxelReadout::Setup_t fReadoutSetupData;
  };

  // This is dirty, dirty.  Sigh.  Due to the limited interface of G4 and the prevalent
  // use of services in LArSoft, there isn't a much better alternative.
  class LArVoxelReadoutGeometry::Sentry {
  public:
    Sentry(LArVoxelReadoutGeometry* const readout,
           detinfo::DetectorClocksData const& clockData,
           detinfo::DetectorPropertiesData const& detProp) noexcept
      : readout_{readout}
    {
      readout_->flarVoxelReadout->SetClockData(&clockData);
      readout_->flarVoxelReadout->SetPropertiesData(&detProp);
    }
    ~Sentry() noexcept
    {
      readout_->flarVoxelReadout->SetClockData(nullptr);
      readout_->flarVoxelReadout->SetPropertiesData(nullptr);
    }

  private:
    LArVoxelReadoutGeometry* const readout_;
  };

} // namespace larg4

#endif // LArG4_LArVoxelReadoutGeometry_h