/data/refman/pasoursint/CMSSW_5_3_1/src/TrackingTools/DetLayers/interface/NavigableLayer.h

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#ifndef DetLayers_NavigableLayer_h
#define DetLayers_NavigableLayer_h

#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"
#include "TrackingTools/DetLayers/interface/NavigationDirection.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include <vector>

class DetLayer;
class FreeTrajectoryState;

class NavigableLayer  {
public:

  virtual ~NavigableLayer() {}

  virtual std::vector<const DetLayer*> 
  nextLayers( NavigationDirection direction) const = 0;

  virtual std::vector<const DetLayer*> 
  nextLayers( const FreeTrajectoryState& fts, 
              PropagationDirection timeDirection) const = 0;

  virtual std::vector<const DetLayer*> 
  compatibleLayers( NavigationDirection direction) const = 0;

  virtual std::vector<const DetLayer*> 
  compatibleLayers( const FreeTrajectoryState& fts, 
                    PropagationDirection timeDirection) const {int counter =0; return compatibleLayers(fts,timeDirection,counter);};

  virtual std::vector<const DetLayer*> 
  compatibleLayers( const FreeTrajectoryState& fts, 
                    PropagationDirection timeDirection,
                    int& counter)const {
    edm::LogWarning("DetLayers") << "compatibleLayers(fts,dir,counter) not implemented. returning empty vector";
    return  std::vector<const DetLayer*>() ;
  }

  virtual DetLayer* detLayer() const = 0;
  virtual void   setDetLayer( DetLayer* dl) = 0;

};

#endif