/data/refman/pasoursint/CMSSW_6_1_1/src/TrackingTools/TrajectoryState/interface/TrajectoryStateClosestToBeamLine.h

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#ifndef TrajectoryStateClosestToBeamLine_H
#define TrajectoryStateClosestToBeamLine_H

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/Measurement1D.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"

class TrajectoryStateClosestToBeamLine
{
public:

  typedef FreeTrajectoryState           FTS;

  TrajectoryStateClosestToBeamLine() : valid(false) {}

  TrajectoryStateClosestToBeamLine
    (const FTS& stateAtPCA, const GlobalPoint & pointOnBeamLine,
     const reco::BeamSpot & beamSpot) : 
      theFTS(stateAtPCA) , thePointOnBeamLine(pointOnBeamLine),
      theBeamSpot(beamSpot), valid(true)
  {}

  ~TrajectoryStateClosestToBeamLine(){}

  FTS const & trackStateAtPCA() const {
    return theFTS;
  }

  GlobalPoint const & beamLinePCA() const {
    return thePointOnBeamLine;
  }

  Measurement1D transverseImpactParameter() const;

  reco::BeamSpot const & beamSpot() {
    return theBeamSpot;
  }

  inline bool isValid() const {return valid;}

private:

  FTS theFTS;
  GlobalPoint thePointOnBeamLine;
  reco::BeamSpot theBeamSpot;
  bool valid;

};
#endif