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 //==========================================================================
 //  AIDA Detector description implementation 
 //--------------------------------------------------------------------------
 // Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
 // All rights reserved.
 //
 // For the licensing terms see $DD4hepINSTALL/LICENSE.
 // For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
 //
 // Author     : M.Frank
 //
 //==========================================================================
 #ifndef DD4HEP_GEOHANDLER_H
 #define DD4HEP_GEOHANDLER_H
 
 /// Framework include files
 #include <DD4hep/Detector.h>
 
 /// C/C++ include files
 #include <set>
 #include <map>
 #include <vector>
 
 // Forward declarations
 class TGeoMatrix;
 class TGeoVolume;
 class TGeoMedium;
 class TGeoShape;
 class TGeoNode;
 
 /// Namespace for the AIDA detector description toolkit
 namespace dd4hep {
 
   // Forward declarations
   class  Detector;
   class  NamedObject;
   class  DetElement;
   class  SensitiveDetector;
   class  VisAttrObject;
   class  Volume;
   class  PlacedVolume;
 
   /// Namespace for implementation details of the AIDA detector description toolkit
   namespace detail {
 
     /// Defintion of the object types used by generic geometry handlers
     /**
      *  \author  M.Frank
      *  \version 1.0
      *  \ingroup DD4HEP_CORE
      */
     class GeoHandlerTypes {
     public:
       /// Data container to store information obtained during the geometry scan
       /**
        *  \author  M.Frank
        *  \version 1.0
        *  \ingroup DD4HEP_CORE
        */
       class GeometryInfo {
       public:
         std::vector<TGeoShape*>   solids;
         std::set<TGeoShape*>   solid_set;
         std::set<Volume>       volumeSet;
         std::vector<Volume>    volumes;
         std::set<VisAttr>      vis;
         std::set<Ref_t>        fields;
         std::set<Material>     materials;
         std::set<TGeoMedium*>  media;
         std::set<TGeoElement*> elements;
         std::vector<std::pair<std::string, TGeoMatrix*> > trafos;
       };
     };
 
     /// The base class for all dd4hep geometry crawlers
     /**
      *  Geometry crawlers are used for multiple purposes, whenever entire
      *  geometries must be traversed like e.g. to create a new geometry
      *  for simulation etc.
      *  While analysing the geometry, information is collected, which
      *  may be later processed.
      *
      *  \author  M.Frank
      *  \version 1.0
      *  \ingroup DD4HEP_CORE
      */
     class GeoHandler: public GeoHandlerTypes {
 
     protected:
       bool  m_propagateRegions { false };
 
       /// actual container with std::vector (preserves order)
       std::map<int, std::vector<const TGeoNode*> >*    m_data      { nullptr };
       /// redundant container with std::set (for lookup purpose)
       std::map<int, std::set<const TGeoNode*> >* m_set_data { nullptr };
 
       std::map<const TGeoNode*, std::vector<TGeoNode*> >* m_daughters { nullptr };
       /// Internal helper to collect geometry information from traversal
       GeoHandler& i_collect(const TGeoNode* parent,
                             const TGeoNode* node,
                             int level, Region rg, LimitSet ls);
 
     private:
       /// Never call Copy constructor
       GeoHandler(const GeoHandler&) {
       }
       /// Never call assignment operator
       GeoHandler& operator=(const GeoHandler&) {
         return *this;
       }
 
     public:
       /// Default constructor
       GeoHandler();
       /// Initializing constructor
       GeoHandler(std::map<int, std::vector<const TGeoNode*> >* ptr,
          std::map<int, std::set<const TGeoNode*> >* ptr_set,
                  std::map<const TGeoNode*, std::vector<TGeoNode*> >* daus = nullptr);
       /// Default destructor
       virtual ~GeoHandler();
       /// Propagate regions. Returns the previous value
       bool setPropagateRegions(bool value);
       /// Collect geometry information from traversal
       GeoHandler& collect(DetElement top);
       /// Collect geometry information from traversal with aggregated information
       GeoHandler& collect(DetElement top, GeometryInfo& info);
       /// Access to collected node list
       std::map<int, std::vector<const TGeoNode*> >* release();
     };
 
     /// Geometry scanner (handle object)
     /**
      *  \author  M.Frank
      *  \version 1.0
      *  \ingroup DD4HEP_CORE
      */
     class GeoScan {
     protected:
       /// Data holder
       std::map<int, std::vector<const TGeoNode*> >* m_data;
     public:
       /// Initializing constructor
       GeoScan(DetElement e);
       /// Initializing constructor
       GeoScan(DetElement e, bool propagateRegions);
       /// Default destructor
       virtual ~GeoScan();
       /// Work callback
       virtual GeoScan& operator()();
     };
   }    // End namespace detail
 }      // End namespace dd4hep
 
 #endif // DD4HEP_GEOHANDLER_H

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