GeometryManager.h

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#ifndef MARLINMT_GEOMETRYMANAGER_h
#define MARLINMT_GEOMETRYMANAGER_h 1

// -- std headers
#include <typeindex>

// -- marlinmt headers
#include <marlinmt/Logging.h>
#include <marlinmt/Exceptions.h>
#include <marlinmt/Component.h>
#include <marlinmt/GeometryPlugin.h>

namespace marlinmt {

  class Application ;

  class GeometryManager : public Component {
  public:
    GeometryManager(const GeometryManager &) = delete ;
    GeometryManager& operator=(const GeometryManager &) = delete ;
    ~GeometryManager() = default ;

    GeometryManager() ;

    template <typename T>
    const T *geometry() const ;

    std::type_index typeIndex() const ;

    void clear() ;
    
  private:
    void initialize() override ;

  private:
    std::shared_ptr<GeometryPlugin>      _plugin {nullptr} ;
    StringParameter                      _geometryType {*this, "GeometryType", "The geometry plugin type", "EmptyGeometry"} ;
  };

  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------

  template <typename T>
  inline const T *GeometryManager::geometry() const {
    if ( nullptr == _plugin ) {
      throw Exception( "GeometryManager::geometry: geometry plugin not created !" ) ;
    }
    auto ptr = _plugin->handle() ;
    if ( nullptr == ptr ) {
      return nullptr ;
    }
    const T *castHandle = static_cast<const T*>( ptr ) ;
    if ( nullptr == castHandle ) {
      throw Exception( "GeometryManager::geometry: invalid geometry cast !" ) ;
    }
    return castHandle ;
  }

} // end namespace marlinmt

#endif