KVGeoNodeIterator.h

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#ifndef __KVGEONODEITERATOR_H
#define __KVGEONODEITERATOR_H
 
#include "KVBase.h"
#include "KVGeoDetectorNode.h"
#include "KVGeoDNTrajectory.h"
 
class KVGeoNodeIterator : public KVBase {
   KVGeoDetectorNode* start_node;
   mutable KVGeoDetectorNode* current_node;
    KVGeoDNTrajectory* iter_on_traj;
   TIter* next_trajectory;
   mutable KVGeoDNTrajectory* current_trajectory;
   Bool_t exclude_start_node;
   Bool_t iterate_backwards;
 
   void begin_iteration_on_next_trajectory() const
   {
      if (iter_on_traj) {
         if (current_trajectory == nullptr) current_trajectory = iter_on_traj;
         else current_trajectory = nullptr;
      }
      else
         current_trajectory = (KVGeoDNTrajectory*)(*next_trajectory)();
      if (current_trajectory) {
         if (iterate_backwards) current_trajectory->IterateBackFrom(start_node);
         else current_trajectory->IterateFrom(start_node);
      }
   }
   void get_next_node_on_current_trajectory() const
   {
      if (current_trajectory) current_node = current_trajectory->GetNextNode();
      else current_node = nullptr;
   }
 
 
public:
   KVGeoNodeIterator(KVGeoDetectorNode* start, KVGeoDNTrajectory* trajectory = nullptr) :
      start_node(start), current_node(start), iter_on_traj(trajectory), next_trajectory(new TIter(start->GetTrajectories())),
      current_trajectory(nullptr), exclude_start_node(kFALSE), iterate_backwards(kFALSE)
   {
 
      begin_iteration_on_next_trajectory();
   }
 
   virtual ~KVGeoNodeIterator()
   {
      delete next_trajectory;
   }
 
   void ExcludeStartNode(Bool_t u = kTRUE)
   {
      exclude_start_node = u;
   }
   void IterateBackwards(Bool_t i = kTRUE)
   {
      iterate_backwards = i;
   }
 
   KVGeoDetectorNode* operator()(void) const
   {
 
      get_next_node_on_current_trajectory();
      if (current_node == nullptr) {
         begin_iteration_on_next_trajectory();
         get_next_node_on_current_trajectory();
      }
      if (exclude_start_node && current_node == start_node) return this->operator()();
      return current_node;
   }
 
   void Reset(KVGeoDetectorNode* start = nullptr, KVGeoDNTrajectory* trajectory = nullptr);
   void ResetTrajectory(KVGeoDNTrajectory* trajectory = nullptr);
 
   ClassDef(KVGeoNodeIterator, 0) //Iterator over geometry nodes/trajectories
};
 
#endif