/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/RecoTracker/TkHitPairs/interface/HitPairGenerator.h

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#ifndef HitPairGenerator_H
#define HitPairGenerator_H

#include <vector>

#include "RecoTracker/TkTrackingRegions/interface/OrderedHitsGenerator.h"
#include "RecoTracker/TkHitPairs/interface/OrderedHitPairs.h"
#include "RecoTracker/TkHitPairs/interface/RecHitsSortedInPhi.h"

class TrackingRegion;
namespace edm { class Event; class EventSetup; }

class HitPairGenerator : public OrderedHitsGenerator {
public:

  explicit HitPairGenerator(unsigned int size=7500);

  virtual ~HitPairGenerator() { }

  virtual const OrderedHitPairs & run(
    const TrackingRegion& region, const edm::Event & ev, const edm::EventSetup& es);

  // temporary interface for backward compatibility only
  virtual void hitPairs( 
    const TrackingRegion& reg, OrderedHitPairs & prs, const edm::EventSetup& es) {}

  // new interface with no temphits copy
  virtual HitDoublets doublets( const TrackingRegion& reg, 
                             const edm::Event & ev,  const edm::EventSetup& es) {
    assert(0=="not implemented");
  }


  virtual void hitPairs( const TrackingRegion& reg, OrderedHitPairs & prs, 
      const edm::Event & ev,  const edm::EventSetup& es) = 0;

  virtual HitPairGenerator* clone() const = 0;

  virtual void clear() {
     // back to initial allocation if too large
     if (thePairs.capacity()> 4*m_capacity) {
       OrderedHitPairs tmp; tmp.reserve(m_capacity); tmp.swap(thePairs);
     } 
     thePairs.clear(); 
  } 

private:
  OrderedHitPairs thePairs;
  unsigned int m_capacity;

};

#endif