GEMDetId.h

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#ifndef DataFormats_MuonDetId_GEMDetId_h
#define DataFormats_MuonDetId_GEMDetId_h

#include "DataFormats/DetId/interface/DetId.h"
#include "FWCore/Utilities/interface/Exception.h"

#include <iosfwd>
#include <iostream>

class GEMDetId :public DetId {
  
 public:
      
  GEMDetId();

  GEMDetId(uint32_t id);
  GEMDetId(DetId id);


  GEMDetId(int region, 
       int ring,
       int station, 
       int layer,
       int chamber,
       int roll);
       

  bool operator < (const GEMDetId& r) const{
    if (r.station() == this->station()  ){
      if (this->layer() ==  r.layer()  ){
    return this->rawId()<r.rawId();
      }
      else{
    return (this->layer() < r.layer());
      }
    }
    else {
      return this->station() < r.station();
    }
  }

  int region() const{
    return int((id_>>RegionStartBit_) & RegionMask_) + minRegionId;
  }

  int ring() const{
      return int((id_>>RingStartBit_) & RingMask_) + minRingId;
  }

  int station() const{
    return int((id_>>StationStartBit_) & StationMask_) + minStationId;
  }

  int layer() const{
    return int((id_>>LayerStartBit_) & LayerMask_) + minLayerId;
  }

  int chamber() const{
    return int((id_>>ChamberStartBit_) & ChamberMask_) + (minChamberId+1);
  }

  int roll() const{
    return int((id_>>RollStartBit_) & RollMask_); // value 0 is used as wild card
  }

  GEMDetId chamberId() const {
    return GEMDetId(id_ & chamberIdMask_);
  }

  GEMDetId superChamberId() const {
    return GEMDetId(id_ & superChamberIdMask_);
  }

  static const int minRegionId=     -1;
  static const int maxRegionId=      1;
 
  static const int minRingId=   1;
  static const int maxRingId=   3;

  static const int minStationId=     1;
  static const int maxStationId=     2;  // in the detId there is space to go up to 4 stations. Only 2 implemented now

  static const int minChamberId=     0;
  static const int maxChamberId=     36;

  // LayerId = 0 is superChamber
  static const int minLayerId=     0;
  static const int maxLayerId=     2;

  static const int minRollId=     0;
  static const int maxRollId=    15;

 private:
  static const int RegionNumBits_  =  2;
  static const int RegionStartBit_ =  0;  
  static const int RegionMask_     =  0X3;

  static const int RingNumBits_  =  3;
  static const int RingStartBit_ =  RegionStartBit_+RegionNumBits_;  
  static const unsigned int RingMask_     =  0X7;

  static const int StationNumBits_  =  3;
  static const int StationStartBit_ =  RingStartBit_+RingNumBits_;  
  static const unsigned int StationMask_     =  0X7;


  static const int ChamberNumBits_  =  6;
  static const int ChamberStartBit_ =  StationStartBit_+StationNumBits_;  
  static const unsigned int ChamberMask_     =  0X3F;

  static const int LayerNumBits_  =  2;
  static const int LayerStartBit_ =  ChamberStartBit_+ChamberNumBits_;  
  static const unsigned int LayerMask_     =  0X3;

  static const int RollNumBits_  =  5;
  static const int RollStartBit_ =  LayerStartBit_+LayerNumBits_;  
  static const unsigned int RollMask_     =  0X1F;
 
  static const uint32_t chamberIdMask_ = ~(RollMask_<<RollStartBit_);

  static const uint32_t superChamberIdMask_ = chamberIdMask_ + ~(LayerMask_<<LayerStartBit_);
  
 private:
  void init(int region, 
        int ring,
        int station, 
        int layer,
        int chamber,
        int roll);
  
  int trind;
}; // GEMDetId

std::ostream& operator<<( std::ostream& os, const GEMDetId& id );

#endif