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#ifndef TrajectoryStateClosestToBeamLineBuilder_H
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#define TrajectoryStateClosestToBeamLineBuilder_H
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#include "TrackingTools/TrajectoryState/interface/TrajectoryStateClosestToBeamLine.h"
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#include "DataFormats/BeamSpot/interface/BeamSpot.h"
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#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
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/**
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* This is the abstract class to build a TrajectoryStateClosestToBeamLine given an original
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* FreeTrajectoryState. This new state is then
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* defined at the point of closest approach to the beam line.
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*/
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class TrajectoryStateClosestToBeamLineBuilder
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{
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public:
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typedef FreeTrajectoryState FTS;
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virtual TrajectoryStateClosestToBeamLine operator()
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(const FTS& originalFTS, const reco::BeamSpot & beamSpot) const = 0;
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};
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#endif
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