ME0DetId.h

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#ifndef DataFormats_MuonDetId_ME0DetId_h
#define DataFormats_MuonDetId_ME0DetId_h

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

#include <iosfwd>
#include <iostream>

class ME0DetId :public DetId {
  
 public:
      
  ME0DetId();

  ME0DetId(uint32_t id);
  ME0DetId(DetId id);


  ME0DetId(int region, 
       int layer,
       int chamber,
       int roll);
       

  bool operator < (const ME0DetId& r) const{
    if (this->layer() ==  r.layer()  ){
      return this->rawId()<r.rawId();
    }
    else{
      return (this->layer() >  r.layer());
    }
  }

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

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

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

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

  ME0DetId chamberId() const {
    return ME0DetId(id_ & chamberIdMask_ & layerIdMask_);
  }
  ME0DetId layerId() const {
    return ME0DetId(id_ & layerIdMask_);
  }

  int nlayers() const{
    return int(maxLayerId);
  }

  static const int minRegionId=     -1;
  static const int maxRegionId=      1;
 
  static const int minChamberId=     0;
  static const int maxChamberId=     36; // ME0 ring consists of 36 chambers spanning 10 degrees

  static const int minLayerId=     0;
  static const int maxLayerId=     6; // ME0 chamber consists of 6 layers for now, change here when changing ME0 Geometry

  static const int minRollId=     0;
  static const int maxRollId=     1; // ME0 layer consits of 1 etapartition for now, change here when changing ME0 Geometry

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

  static const int ChamberNumBits_  =  6;
  static const int ChamberStartBit_ =  RegionStartBit_+RegionNumBits_;  
  static const unsigned int ChamberMask_     =  0X3F;

  static const int LayerNumBits_  =  5;
  static const int LayerStartBit_ =  ChamberStartBit_+ChamberNumBits_;  
  static const unsigned int LayerMask_     =  0X1F;

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

 private:
  void init(int region, 
        int layer,
        int chamber,
        int roll);
  
  int trind;
}; // ME0DetId

std::ostream& operator<<( std::ostream& os, const ME0DetId& id );

#endif