/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/Geometry/MuonNumbering/src/GEMNumberingScheme.cc

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#include "Geometry/MuonNumbering/interface/GEMNumberingScheme.h"
#include "Geometry/MuonNumbering/interface/MuonBaseNumber.h"
#include "Geometry/MuonNumbering/interface/MuonDDDConstants.h"
#include "DataFormats/MuonDetId/interface/GEMDetId.h"
#include <iostream>

//#define LOCAL_DEBUG

GEMNumberingScheme::GEMNumberingScheme( const MuonDDDConstants& muonConstants ) {
  initMe(muonConstants);
}

GEMNumberingScheme::GEMNumberingScheme( const DDCompactView& cpv ){
  MuonDDDConstants muonConstants(cpv);
  initMe(muonConstants);
}

void GEMNumberingScheme::initMe ( const MuonDDDConstants& muonConstants ) {
  int theLevelPart= muonConstants.getValue("level");
  theRegionLevel  = muonConstants.getValue("mg_region")/theLevelPart;
  theStationLevel = muonConstants.getValue("mg_station")/theLevelPart;
  theRingLevel    = muonConstants.getValue("mg_ring")/theLevelPart;
  theSectorLevel  = muonConstants.getValue("mg_sector")/theLevelPart;
  theRollLevel    = muonConstants.getValue("mg_roll")/theLevelPart;
#ifdef LOCAL_DEBUG
  std::cout << "Initialize GEMNumberingScheme" <<std::endl;
  std::cout << "theRegionLevel " << theRegionLevel <<std::endl;
  std::cout << "theStationLevel "<< theStationLevel<<std::endl;
  std::cout << "theRingLevel "   << theRingLevel   <<std::endl;
  std::cout << "theSectorLevel " << theSectorLevel <<std::endl;
  std::cout << "theRollLevel "   << theRollLevel   <<std::endl;
#endif
}

int GEMNumberingScheme::baseNumberToUnitNumber(const MuonBaseNumber num) {

#ifdef LOCAL_DEBUG
  std::cout << "GEMNumbering "<<num.getLevels()<<std::endl;
  for (int level=1;level<=num.getLevels();level++) {
    std::cout << level << " " << num.getSuperNo(level)
              << " " << num.getBaseNo(level) << std::endl;
  }
#endif

  int maxLevel = theRollLevel;
  if (num.getLevels()!=maxLevel) {
    std::cout << "MuonGEMNS::BNToUN "
              << "BaseNumber has " << num.getLevels() << " levels,"
              << "need "<<maxLevel<<std::endl;
    return 0;
  }

  int region(0), ring(0), station(0), layer(0), chamber(0), roll(0);

  //decode significant GEM levels
  
  if (num.getBaseNo(theRegionLevel) == 0) region = 1;
  else                                    region =-1;
  station = num.getBaseNo(theStationLevel)+1;
  ring    = num.getBaseNo(theRingLevel)+1;
  roll    = num.getBaseNo(theRollLevel)+1;
  const int copyno = num.getBaseNo(theSectorLevel) + 1;
  if (copyno < 50) {
    if (copyno%2 == 0) {
      layer   = 2;
      chamber = copyno-1;
    } else {
      layer   = 1;
      chamber = copyno;
    }
  } else {
    int copynp = copyno - 50;
    if (copynp%2 != 0) {
      layer   = 2;
      chamber = copynp-1;
    } else {
      layer   = 1;
      chamber = copynp;
    }
  }

  // collect all info
  
#ifdef LOCAL_DEBUG
  std::cout << "GEMNumberingScheme: Region " << region << " Ring "
            << ring << " Station " << station << " Layer " << layer
            << " Chamber " << chamber << " Roll " << roll << std::endl;
#endif

  // Build the actual numbering
  GEMDetId id(region,ring,station,layer,chamber, roll);
  
  
#ifdef LOCAL_DEBUG
  std::cout << " DetId " << id << std::endl;
#endif
      
  return id.rawId();
}