/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/RecoCaloTools/Navigation/interface/CaloNavigator.h

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#ifndef RECOCALOTOOLS_NAVIGATION_CALONAVIGATOR_H
#define RECOCALOTOOLS_NAVIGATION_CALONAVIGATOR_H 1

#include "Geometry/CaloTopology/interface/CaloSubdetectorTopology.h"
#include "FWCore/Utilities/interface/GCC11Compatibility.h"

template <class T, class TOPO=CaloSubdetectorTopology>
class CaloNavigator GCC11_FINAL {
 public:

  CaloNavigator(const T& home, const TOPO * topology) : myTopology_(topology) 
    {
      setHome(home);
    }

  inline void setHome(const T& startingPoint);

  inline void setTopology(const TOPO *);

  const TOPO * getTopology() const
    {
      return myTopology_;
    }

  inline void home() const ;

  T pos() const { return currentPoint_; }

  T operator*() const { return currentPoint_; } 

  T north() const 
    { 
     currentPoint_=myTopology_->goNorth(currentPoint_);
     return currentPoint_;
    } ;

  T south()  const 
    { 
     currentPoint_=myTopology_->goSouth(currentPoint_);
      return currentPoint_;
    } ;

  T east() const
    { 
     currentPoint_=myTopology_->goEast(currentPoint_);
     return currentPoint_;
    } ;

  T west() const
    { 
     currentPoint_=myTopology_->goWest(currentPoint_);
     return currentPoint_;
    } ;

  T up() const
    { 
      currentPoint_=myTopology_->goUp(currentPoint_);
      return currentPoint_;
    } ;

  T down() const
    { 
     currentPoint_=myTopology_->goDown(currentPoint_);
     return currentPoint_;
    } ;

  T offsetBy(int deltaX, int deltaY) const
    {
      for(int x=0; x < abs(deltaX) && currentPoint_ != T(0); x++)
        {
          if(deltaX > 0) east();
          else           west();
        }

      for(int y=0; y < abs(deltaY) && currentPoint_ != T(0); y++)
        {
          if(deltaY > 0) north();
          else           south();
        }

      return currentPoint_;

    }

 protected:
  
  const TOPO * myTopology_;
  mutable T startingPoint_, currentPoint_;
};

template <class T, class TOPO>
inline
void CaloNavigator<T,TOPO>::setHome(const T& startingPoint)
{
  startingPoint_=startingPoint;
  home();
}

template <class T, class TOPO>
inline
void CaloNavigator<T,TOPO>::home() const
{
  currentPoint_=startingPoint_;
}

template <class T, class TOPO>
inline
void CaloNavigator<T,TOPO>::setTopology(const TOPO * topology) 
{
  if (myTopology_ == 0)
    myTopology_=topology;
  else
    return;
}

#endif