/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/DataFormats/EcalDetId/interface/EBDetId.h

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#ifndef ECALDETID_EBDETID_H
#define ECALDETID_EBDETID_H

#include <iosfwd>
#include <cmath>
#include <cstdlib>
#include "DataFormats/DetId/interface/DetId.h"
#include "DataFormats/EcalDetId/interface/EcalSubdetector.h"
#include "DataFormats/EcalDetId/interface/EcalTrigTowerDetId.h"


class EBDetId : public DetId {
 public:
  enum { Subdet=EcalBarrel};
  EBDetId() {}
  EBDetId(uint32_t rawid) : DetId(rawid) {}
  // fast
  EBDetId(  int crystal_ieta, int crystal_iphi) : DetId(Ecal,EcalBarrel) {
    id_|=((crystal_ieta>0)?(0x10000|(crystal_ieta<<9)):((-crystal_ieta)<<9))|(crystal_iphi&0x1FF);
  }
  // slow
  EBDetId(int index1, int index2, int mode);
  EBDetId(const DetId& id) : DetId(id){}
  EBDetId& operator=(const DetId& id) {
    id_=id.rawId();
  return *this;
  }

  // EcalSubdetector subdet() const { return EcalSubdetector(subdetId()); }
  static EcalSubdetector subdet() { return EcalBarrel;}

  int zside() const { return (id_&0x10000)?(1):(-1); }
  int ietaAbs() const { return (id_>>9)&0x7F; }
  int ieta() const { return zside()*ietaAbs(); }
  int iphi() const { return id_&0x1FF; }
  int tower_ieta() const { return ((ietaAbs()-1)/5+1)*zside(); }
  int tower_iphi() const;
  EcalTrigTowerDetId tower() const { return EcalTrigTowerDetId(zside(),EcalBarrel,abs(tower_ieta()),tower_iphi()); }
  int ism() const  {
    int id = ( iphi() - 1 ) / kCrystalsInPhi + 1;
    return positiveZ() ? id : id+18;
  }
  int im() const {
    int ii = (ietaAbs()-26);
    return ii<0 ? 1 : (ii/20 +2);
  }
  int ic() const;
  int ietaSM() const { return ietaAbs(); }
  int iphiSM() const { return (( ic() -1 ) % kCrystalsInPhi ) + 1; }
  
  // is z positive?
  bool positiveZ() const { return id_&0x10000;}
  // crystal number in eta-phi grid
  int numberByEtaPhi() const { 
    return (MAX_IETA + (positiveZ() ? ietaAbs()-1 : -ietaAbs()) )*MAX_IPHI+ iphi()-1;
  }
  // index numbering crystal by SM
  int numberBySM() const; 
  int hashedIndex() const { return numberByEtaPhi(); }

  uint32_t denseIndex() const { return hashedIndex() ; }

  EBDetId offsetBy( int nrStepsEta, int nrStepsPhi ) const;

  EBDetId switchZSide() const;
 
  static DetId offsetBy( const DetId startId, int nrStepsEta, int nrStepsPhi );
  static DetId switchZSide( const DetId startId );

  float approxEta() const { return ieta() * crystalUnitToEta; }
  static float approxEta( const DetId id );

  static bool validDenseIndex( uint32_t din ) { return ( din < kSizeForDenseIndexing ) ; }

  static EBDetId detIdFromDenseIndex( uint32_t di ) { return unhashIndex( di ) ; }

  static EBDetId unhashIndex( int hi ) {
    const int pseudo_eta = hi/MAX_IPHI - MAX_IETA;
    return ( validHashIndex( hi ) ?
             EBDetId(pseudo_eta<0 ? pseudo_eta :  pseudo_eta+1, hi%MAX_IPHI+1) :
             EBDetId() ) ;
  }

  static bool validHashIndex(int i) { return !(i<MIN_HASH || i>MAX_HASH); }

  static bool validDetId(int i, int j) {
    return i!=0 && (std::abs(i) <= MAX_IETA)
      && (j>=MIN_IPHI) && (j <= MAX_IPHI); 
  }

  static bool isNextToBoundary(EBDetId id);

  static bool isNextToEtaBoundary(EBDetId id);

  static bool isNextToPhiBoundary(EBDetId id);

  //return the distance in eta units between two EBDetId
  static int distanceEta(const EBDetId& a,const EBDetId& b); 
  //return the distance in phi units between two EBDetId
  static int distancePhi(const EBDetId& a,const EBDetId& b); 

  static const int MIN_IETA = 1;
  static const int MIN_IPHI = 1;
  static const int MAX_IETA = 85;
  static const int MAX_IPHI = 360;
  static const int kChannelsPerCard = 5;
  static const int kTowersInPhi = 4;  // per SM
  static const int kModulesPerSM = 4;
  static const int kModuleBoundaries[4] ;
  static const int kCrystalsInPhi = 20; // per SM
  static const int kCrystalsInEta = 85; // per SM
  static const int kCrystalsPerSM = 1700;
  static const int MIN_SM = 1;
  static const int MAX_SM = 36;
  static const int MIN_C = 1;
  static const int MAX_C = kCrystalsPerSM;
  static const int MIN_HASH =  0; // always 0 ...
  static const int MAX_HASH =  2*MAX_IPHI*MAX_IETA-1;

  // eta coverage of one crystal (approximate)
  static const float crystalUnitToEta;

  enum { kSizeForDenseIndexing = MAX_HASH + 1 } ;
  

  // function modes for (int, int) constructor
  static const int ETAPHIMODE = 0;
  static const int SMCRYSTALMODE = 1;
};

std::ostream& operator<<(std::ostream& s,const EBDetId& id);


#endif