EGamma_ElectronTrackingValidation/util/PXBDetId.hpp

#ifndef DataFormats_SiStripDetId_PXBDetId_H
#define DataFormats_SiStripDetId_PXBDetId_H

#include <ostream>
#include "util/DetId.hpp"
#include "util/PixelSubdetector.hpp"

/**
 *  Det identifier class for the PixelBarrel
 */

class PXBDetId;

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

class PXBDetId : public DetId {
 public:
  /** Constructor of a null id */
  PXBDetId();
  /** Constructor from a raw value */
  PXBDetId(uint32_t rawid);
  /**Construct from generic DetId */
  PXBDetId(const DetId& id);

  PXBDetId(uint32_t layer, uint32_t ladder, uint32_t module)
    :DetId(DetId::Tracker,PixelSubdetector::PixelBarrel){
      id_ |= (layer& layerMask_)   << layerStartBit_     |
             (ladder& ladderMask_) << ladderStartBit_  |
             (module& moduleMask_) << moduleStartBit_;
  }


  /// layer id
  unsigned int layer() const{
    return int((id_>>layerStartBit_) & layerMask_);}

  /// ladder  id
  unsigned int ladder() const
    { return ((id_>>ladderStartBit_) & ladderMask_) ;}

  /// det id
  unsigned int module() const
    { return ((id_>>moduleStartBit_)& moduleMask_) ;}

 private:
  /// two bits would be enough, but  we could use the number "0" as a wildcard
  static const unsigned int layerStartBit_=   16;
  static const unsigned int ladderStartBit_=   8;
  static const unsigned int moduleStartBit_=      2;
  /// two bits would be enough, but  we could use the number "0" as a wildcard
  static const unsigned int layerMask_=       0xF;
  static const unsigned int ladderMask_=      0xFF;
  static const unsigned int moduleMask_=         0x3F;
};


#endif