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CSCIndexer.h

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#ifndef MuonDetId_CSCIndexer_h
#define MuonDetId_CSCIndexer_h

#include <DataFormats/MuonDetId/interface/CSCDetId.h>
#include <vector>
#include <iosfwd>
#include <utility>  // for pair

class CSCIndexer {

public:

  //  typedef unsigned short int IndexType;
  //  typedef unsigned       int LongIndexType;
  typedef uint16_t IndexType;
  typedef uint32_t LongIndexType;

  CSCIndexer(){};
  ~CSCIndexer(){};

   IndexType chamberIndex( const CSCDetId& id ) const {
     return chamberIndex( id.endcap(), id.station(), id.ring(), id.chamber() );
   }

   IndexType layerIndex( const CSCDetId& id ) const {
     return layerIndex(id.endcap(), id.station(), id.ring(), id.chamber(), id.layer());
   }

   IndexType startChamberIndexInEndcap(IndexType ie, IndexType is, IndexType ir) const {
     const IndexType nschin[24] = {1,37,73,    109,127,0, 163,181,0, 217,469,0,
                                  235,271,307, 343,361,0, 397,415,0, 451,505,0 };
     return nschin[(ie-1)*12 + (is-1)*3 + ir-1];

   }

   IndexType chamberIndex(IndexType ie, IndexType is, IndexType ir, IndexType ic) const {
     return startChamberIndexInEndcap(ie,is,ir) + ic - 1; // -1 so start index _is_ ic=1
   }

   IndexType layerIndex(IndexType ie, IndexType is, IndexType ir, IndexType ic, IndexType il) const {
    const IndexType layersInChamber = 6;
     return (chamberIndex(ie,is,ir,ic) - 1 ) * layersInChamber + il;
   }

   IndexType ringsInStation( IndexType is ) const {
      const IndexType nrins[5] = {0,3,2,2,2}; // rings per station
      return nrins[is];
   }

   IndexType chambersInRingOfStation(IndexType is, IndexType ir) const {
      IndexType nc = 36; // most rings have 36 chambers
      if (is >1 && ir<2 ) nc = 18; // but 21, 31, 41 have 18
      return nc;
   }

   IndexType stripChannelsPerLayer( IndexType is, IndexType ir ) const {
     const IndexType nSCinC[12] = { 80,80,64, 80,80,0, 80,80,0, 80,80,0 };
     return nSCinC[(is-1)*3 + ir - 1];
   }

   LongIndexType stripChannelStart( IndexType ie, IndexType is, IndexType ir ) const {

     // These are in the ranges 1-217728 (CSCs 2008) and 217729-252288 (ME42).
     // There are 1-108884 channels per endcap (CSCs 2008) and 17280 channels per endcap (ME42).
     // Start of -z channels (CSCs 2008) is 108864 + 1 = 108865
     // Start of +z (ME42) is 217728 + 1 = 217729
     // Start of -z (ME42) is 217728 + 1 + 17280 = 235009
      const LongIndexType nStart[24] = { 1,17281,34561, 48385,57025,0, 74305,82945,0, 100225,217729,0,
                                   108865,126145,143425, 157249,165889,0, 183169,191809,0, 209089,235009,0 };
      return  nStart[(ie-1)*12 + (is-1)*3 + ir - 1];
   }

   LongIndexType stripChannelIndex( IndexType ie, IndexType is, IndexType ir, IndexType ic, IndexType il, IndexType istrip ) const {
      return stripChannelStart(ie,is,ir)+( (ic-1)*6 + il - 1 )*stripChannelsPerLayer(is,ir) + (istrip-1);
   }

   LongIndexType stripChannelIndex( const CSCDetId& id, IndexType istrip ) const {
      return stripChannelIndex(id.endcap(), id.station(), id.ring(), id.chamber(), id.layer(), istrip );
   }

  CSCDetId detIdFromLayerIndex( IndexType ili ) const;
  CSCDetId detIdFromChamberIndex( IndexType ici ) const;
  CSCDetId detIdFromChamberIndex_OLD( IndexType ici ) const;
  CSCDetId detIdFromChamberLabel( IndexType ie, IndexType icl ) const;
  std::pair<CSCDetId, IndexType> detIdFromStripChannelIndex( LongIndexType ichi ) const;

  IndexType chamberLabelFromChamberIndex( IndexType ) const; // just for cross-checks

  int dbIndex(const CSCDetId & id, int & channel);

private:
  void fillChamberLabel() const; // const so it can be called in const function detIdFromChamberIndex

  mutable std::vector<IndexType> chamberLabel; // mutable so can be filled by fillChamberLabel


};

#endif

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