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#ifndef DTRecHit_DTRecHit1DPair_H
#define DTRecHit_DTRecHit1DPair_H
/** \class DTRecHit1DPair
*
* Composed recHit representing a pair of reconstructed hits
*
* For each signal theLeftHit in the DT wire, two hits can be constructed, due to the
* Left/Right ambiguity, which can be solved only associating several hits
* together. This class describes the pair of points associated to a single
* TDC signal. The two hits can be accessed via recHits()
* method. The position is the average of the theLeftHit and theRightHit hits, namely the
* wire position.
*
* \author S. Lacaprara & G. Cerminara
*/
#include "DataFormats/DTRecHit/interface/DTRecHit1D.h"
#include "DataFormats/MuonDetId/interface/DTWireId.h"
#include <utility>
class DTLayer;
class DTDigi;
class DTRecHit1DPair : public RecHit1D {
public:
/// Constructor without components: must use setPos and Err!
DTRecHit1DPair(const DTWireId& wireId, const DTDigi& digi);
/// Default constructor. Needed to write the RecHit into a STL container.
DTRecHit1DPair();
/// Destructor
~DTRecHit1DPair() override;
// Operations
DTRecHit1DPair* clone() const override;
/// Return the 3-dimensional local position.
/// The average theLeftHit/theRightHit hits position, namely the wire position
/// is returned.
LocalPoint localPosition() const override;
/// Return the 3-dimensional error on the local position.
/// The error is defiened as half
/// the distance between theLeftHit and theRightHit pos
LocalError localPositionError() const override;
/// Access to component RecHits.
/// Return the two recHits (L/R)
std::vector<const TrackingRecHit*> recHits() const override;
/// Non-const access to component RecHits.
/// Return the two recHits (L/R)
std::vector<TrackingRecHit*> recHits() override;
/// Return the detId of the Det (a DTLayer).
virtual DetId geographicalId() const;
/// Return the digi time (ns) used to build the rechits
float digiTime() const { return theLeftHit.digiTime(); }
/// Comparison operator, based on the wireId and the digi time
bool operator==(const DTRecHit1DPair& hit) const;
/// Inequality operator, defined as the mirror image of the comparions
/// operator
bool operator!=(const DTRecHit1DPair& hit) const { return !(*this == hit); }
/// Return position in the local (layer) coordinate system for a
/// certain hypothesis about the L/R cell side
LocalPoint localPosition(DTEnums::DTCellSide lrside) const;
/// Return position error in the local (layer) coordinate system for a
/// certain hypothesis about the L/R cell side
LocalError localPositionError(DTEnums::DTCellSide lrside) const;
/// Set the 3-dimensional local position for the component hit
/// corresponding to the given cell side. Default value is assumed for the error.
void setPosition(DTEnums::DTCellSide lrside, const LocalPoint& point);
/// Set the 3-dimensional local position and error for the component hit
/// corresponding to the given cell side. Default value is assumed for the error.
void setPositionAndError(DTEnums::DTCellSide lrside, const LocalPoint& point, const LocalError& err);
// Return the wireId
DTWireId wireId() const { return theLeftHit.wireId(); }
/// Return the left/right DTRecHit1D
const DTRecHit1D* componentRecHit(DTEnums::DTCellSide lrSide) const;
/// Get the left and right 1D rechits (first and second respectively).
std::pair<const DTRecHit1D*, const DTRecHit1D*> componentRecHits() const;
private:
/// Non const access to left/right DTRecHit1D
DTRecHit1D* componentRecHit(DTEnums::DTCellSide lrSide);
// The two rechits
DTRecHit1D theLeftHit;
DTRecHit1D theRightHit;
};
/// Ostream operator
std::ostream& operator<<(std::ostream& os, const DTRecHit1DPair& hit);
#endif
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