#ifndef PLANARSHELL_HPP
#define PLANARSHELL_HPP
//
// $Id: PlanarShell.hpp,v 1.4 2004/04/08 20:08:55 snyder Exp $
//
// File: PlanarShell.hpp
// Purpose: Represents a thin plane of material
// Created: 03-DEC-1998 John D. Hobbs (cut-and-paste of Harry L. Melanson code)
//
// $Revision: 1.4 $
//
//

// Include files

#include <iostream>
#include <geometry_system/management/HandleSystem.hpp>
#include <material/Material.hpp>

/**  A thin cylindrical shell.

     A {\bf PlanarShell} represents a thin shelled cylinder which
     has a given thickness (in cm) and is associated with a given {\bf
     Material}.  In addition, a {\bf PlanarShell} contains a
     reference to a {\bf templated geometry component}, which contains 
     maintains all position / rotation information for the cylinder.

  */

template <class T> class PlanarShell;
template <class T>
std::ostream& operator<< (std::ostream&, const PlanarShell<T>*);
template <class T>
std::ostream& operator<< (std::ostream&, const PlanarShell<T>&);

template<class T> class PlanarShell
{

  //------------------  Public Methods -------------------//
  
public:
  
  /**  Constructor.

       Builds a {\bf PlanarShell} given a {\bf Handle} to {\bf
       Plane}, a {\bf Material} and a thickness.

    */

  PlanarShell(dgs::Handle<const T> surface,
	      const float thickness,
	      const D0Material::Material& material);

  ///  Returns point to {\bf Material}.
  const D0Material::Material* get_Material() const;

  /**  Returns the fraction of a radiation length.

       This method returns the perpendicular thickness of the material
       associated with this shell, in fractions of a radiation length.

  */

  ///  Returns Handle to positioning Plane.
  dgs::Handle< const T> get_Surface() const;

  float get_X0_frac() const;

  ///  Returns perpendicular thickness of material in cm.
  float get_Thickness() const;

  ///  Stream insertion operator.
  friend std::ostream& operator<< <> (std::ostream&, const PlanarShell*);
  
  ///  Stream insertion operator.
  friend std::ostream& operator<< <> (std::ostream&, const PlanarShell&);
    
  //------------------ Private Data Members -------------------//

private:


  ///  Handle to the geometry component,
  dgs::Handle<const T> d_surface;

  ///  The material type.
  const D0Material::Material d_material;

  ///  The material thickness, in cm.
  const float d_thickness;

};

#include <thinshells/PlanarShell.tcc>
#endif //PLANARSHELL_HPP