TrackExtraBase.h

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#ifndef TrackReco_TrackExtraBase_h
#define TrackReco_TrackExtraBase_h

#include "DataFormats/TrackingRecHit/interface/TrackingRecHitFwd.h"
#include "DataFormats/TrajectoryState/interface/LocalTrajectoryParameters.h"
namespace reco
{

class TrackExtraBase
{

public:
    using TrajParams = std::vector<LocalTrajectoryParameters>;
    using Chi2sFive = std::vector<unsigned char>;

    TrackExtraBase() : m_firstHit(-1), m_nHits(0) { }

    void setHits(TrackingRecHitRefProd const & prod, unsigned firstH, unsigned int nH) {
        m_hitCollection.pushBackItem(prod.refCore(),true);
        m_firstHit =firstH;  m_nHits=nH;
    }

    void setTrajParams(TrajParams  tmps, Chi2sFive chi2s) { m_trajParams = std::move(tmps); m_chi2sX5 = std::move(chi2s);}

    unsigned int firstRecHit() const {
      return m_firstHit;
    }

    unsigned int recHitsSize() const {
        return m_nHits;
    }


    trackingRecHit_iterator recHitsBegin() const {
        return recHitsProduct().data().begin()+firstRecHit();
    }

    trackingRecHit_iterator recHitsEnd() const {
        return recHitsBegin()+recHitsSize();
    }

    TrackingRecHitRef recHitRef(unsigned int i) const {
      //Another thread might change the RefCore at the same time.
      // By using a copy we will be safe.
      edm::RefCore hitCollection( m_hitCollection);
      if(hitCollection.productPtr()) {
        TrackingRecHitRef::finder_type finder;
        TrackingRecHitRef::value_type const* item = finder(*(static_cast<TrackingRecHitRef::product_type const*>(hitCollection.productPtr())), m_firstHit+i);
        return TrackingRecHitRef(hitCollection.id(), item, m_firstHit+i);
      }
      return TrackingRecHitRef(hitCollection,m_firstHit+i);
    }

    TrackingRecHitRef recHit(unsigned int i) const {
        return recHitRef(i);
    }

    TrackingRecHitCollection const & recHitsProduct() const {
      return *edm::getProduct<TrackingRecHitCollection>(m_hitCollection);

    }

    TrajParams const & trajParams() const  {return m_trajParams;}
    Chi2sFive const & chi2sX5() const { return m_chi2sX5;}
private:

    edm::RefCore m_hitCollection;
    unsigned int m_firstHit;
    unsigned int m_nHits;
    TrajParams m_trajParams; 
    Chi2sFive m_chi2sX5;  // chi2 * 5  chopped at 255  (max chi2 is 51)
};

}// namespace reco

#endif