/**
   \file
   \brief Description of a mirror segment.

   \author L. Prado Jr 
   \author S. Argiro
   \version $Id: MirrorSegment.h 17294 2010-07-08 15:57:51Z smueller $
   \date 29 Jun 2003
*/

#ifndef _fdet_MirrorSegment_h_
#define _fdet_MirrorSegment_h__

#include <string>

namespace utl {
  class TabulatedFunction;
}

namespace fdet {

/**
   \class MirrorSegment
   \brief Description of a mirror segment.

   \author L. Prado Jr 
   \author S. Argiro
   \version $Id: MirrorSegment.h 17294 2010-07-08 15:57:51Z smueller $
   \date 29 Jun 2003
   \ingroup fdet
*/
  
  class Telescope;
  
  class MirrorSegment {
    
  public:
    
    /// Reflectivity of the mirror segment as a function of the wavelength
    const utl::TabulatedFunction& GetReflectivity() const;
    
    /// Radius of curvature of the segment
    double GetRadiusOfCurvature() const;
    
    /// Variable to model the surface imperfection of the segment
    double GetSigmaNormal() const;
    
  private:
    MirrorSegment();
    ~MirrorSegment();

  private:

    template <typename T> inline const T& GetMirrorSegmentData(T*& requestedData, 
                                                               const std::string& property, 
                                                               const std::string& component, 
                                                               const std::string& errorMsg) const;
    template <typename T> inline void GetMirrorSegmentData(T& requestedData, 
                                                           const std::string& property, 
                                                           const std::string& component, 
                                                           const std::string& errorMsg) const;


  private:
    
    // Quantities filled by lazy evaluation
    // ------------------------------------
    mutable double* fRadiusOfCurvature;       
    mutable double* fSigmaNormal;
    mutable utl::TabulatedFunction* fReflectivity;
         
    friend class Telescope;        
  
  };
  
} 

#endif //_fdet_MirrorSegment_h_

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