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CaloID.h

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#ifndef DataFormats_CaloRecHit_CaloID_h
#define DataFormats_CaloRecHit_CaloID_h

#include <iostream>

namespace reco {

  class CaloID {
    
  public:

    enum Detectors {
      DET_ECAL_BARREL = 0,
      DET_ECAL_ENDCAP,
      DET_PS1,
      DET_PS2,
      DET_HCAL_BARREL,
      DET_HCAL_ENDCAP,
      DET_HF,
      DET_HO,
      DET_NONE
    };

    CaloID() : detectors_(0) {}

    CaloID(Detectors det) : detectors_(0) { setDetector(det, true); }
    
    virtual ~CaloID() {}

    void setDetector(CaloID::Detectors theDetector, bool value);
        
    unsigned detectors() const {return detectors_;}
    
    bool detector(CaloID::Detectors theDetector) const;

    bool isSingleDetector() const {
      // check that detectors_ is a power of 2
      return static_cast<bool>(detectors_ && !( (detectors_-1) & detectors_ ));
    }

    Detectors  detector() const; 

    CaloID& operator=(const CaloID& rhs) { 
      detectors_ = rhs.detectors_;
      return *this;
    }

    friend std::ostream& operator<<(std::ostream& out,
                                    const CaloID& id);
   
  private:
    
    int leastSignificantBitPosition(unsigned n) const;

    unsigned  detectors_;
  };

}

#endif

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