CaloID.cc

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#include "DataFormats/CaloRecHit/interface/CaloID.h"
#include <iostream>

using namespace reco;
using namespace std;

void CaloID::setDetector(Detectors theDetector, bool value) {
  //  cout<<"CaloID::setDetector "<<theDetector<<" "<<(1<<theDetector)<<endl;
  if (value)
    detectors_ = detectors_ | (1 << theDetector);
  else
    detectors_ = detectors_ ^ (1 << theDetector);

  // cout<<detectors_<<endl;
}

bool CaloID::detector(Detectors theDetector) const { return (detectors_ >> theDetector) & 1; }

CaloID::Detectors CaloID::detector() const {
  if (!isSingleDetector())
    return DET_NONE;

  int pos = leastSignificantBitPosition(detectors_);

  CaloID::Detectors det = static_cast<CaloID::Detectors>(pos);

  return det;
}

int CaloID::leastSignificantBitPosition(unsigned n) const {
  if (n == 0)
    return -1;

  int pos = 31;

  if (n & 0x000000000000FFFFLL) {
    pos -= 16;
  } else {
    n >>= 16;
  }
  if (n & 0x00000000000000FFLL) {
    pos -= 8;
  } else {
    n >>= 8;
  }
  if (n & 0x000000000000000FLL) {
    pos -= 4;
  } else {
    n >>= 4;
  }
  if (n & 0x0000000000000003LL) {
    pos -= 2;
  } else {
    n >>= 2;
  }
  if (n & 0x0000000000000001LL) {
    pos -= 1;
  }
  return pos;
}

std::ostream& reco::operator<<(std::ostream& out, const CaloID& id) {
  if (!out)
    return out;

  out << "CaloID: " << id.detectors();
  return out;
}