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/// \file DetectorConstruction.hh
/// \brief Definition of the DetectorConstruction class

#ifndef DetectorConstruction_h
#define DetectorConstruction_h 1

#include "G4VUserDetectorConstruction.hh"
#include "globals.hh"

class G4VPhysicalVolume;
class G4GlobalMagFieldMessenger;

/// Detector construction class to define materials and geometry.
/// The calorimeter is a box made of a given number of layers. A layer consists
/// of an absorber plate and of a detection gap. The layer is replicated.
///
/// Four parameters define the geometry of the calorimeter :
///
/// - the thickness of an absorber plate,
/// - the thickness of a gap,
/// - the number of layers,
/// - the transverse size of the calorimeter (the input face is a square).
///
/// In ConstructSDandField() sensitive detectors of CalorimeterSD type
/// are created and associated with the Absorber and Gap volumes.
/// In addition a transverse uniform magnetic field is defined 
/// via G4GlobalMagFieldMessenger class.

class DetectorConstruction : public G4VUserDetectorConstruction
{
  public:
    DetectorConstruction();
    virtual ~DetectorConstruction();

  public:
    virtual G4VPhysicalVolume* Construct();
    virtual void ConstructSDandField();
     
  private:
    // data members
    //
    static G4ThreadLocal G4GlobalMagFieldMessenger*  fMagFieldMessenger; 
};

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#endif

