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#ifndef DetectorConstruction_h
#define DetectorConstruction_h 1

#include "globals.hh"
#include "G4VUserDetectorConstruction.hh"
#include "G4VSolid.hh"

class G4Box ;
class G4LogicalVolume;
class G4VPhysicalVolume;
class G4Material;
class DetectorMessenger;

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

  public:
  
     G4VPhysicalVolume* Construct();
     
     const 
     G4VPhysicalVolume* GetTracker() {return physiTracker;};
     G4double GetWorldFullLength()   {return fWorldLength;}; 
  
     G4VSolid * GetSolid()  { return aVolume ; }

     void  SwitchDetector();
     G4VPhysicalVolume* SelectDetector (const G4String& val);

  private:

     G4Box*             solidWorld;    // pointer to the solid envelope 
     G4LogicalVolume*   logicWorld;    // pointer to the logical envelope
     G4VPhysicalVolume* physiWorld;    // pointer to the physical envelope
     G4VSolid* aVolume;

     G4LogicalVolume*   logicTracker;  // pointer to the logical Tracker
     G4VPhysicalVolume* physiTracker;  // pointer to the physical Tracker
     
 
     DetectorMessenger* detectorMessenger;  // pointer to the Messenger
       
     G4double fWorldLength;            // Full length of the world volume


     G4String fval ;

};

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#endif