/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/L1Trigger/GlobalCaloTrigger/src/L1GctHtMissLut.cc

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#include "L1Trigger/GlobalCaloTrigger/interface/L1GctHtMissLut.h"

#include "CondFormats/L1TObjects/interface/L1CaloEtScale.h"

#include <math.h>

//DEFINE STATICS
const int L1GctHtMissLut::NAddress=2*L1GctHtMissLut::kHxOrHyMissComponentNBits;
const int L1GctHtMissLut::NData   =L1GctHtMissLut::kHtMissMagnitudeNBits+L1GctHtMissLut::kHtMissAngleNBits;

L1GctHtMissLut::L1GctHtMissLut(const L1CaloEtScale* const scale, const double lsb) :
  L1GctLut<NAddress,NData>(),
  m_etScale(scale),
  m_componentLsb(lsb)
{
  if (scale != 0) m_setupOk = true;
}

L1GctHtMissLut::L1GctHtMissLut() :
  L1GctLut<NAddress,NData>(),
  m_etScale(0),
  m_componentLsb(1.0)
{
}

L1GctHtMissLut::L1GctHtMissLut(const L1GctHtMissLut& lut) :
  L1GctLut<NAddress,NData>(),
  m_etScale(lut.etScale()),
  m_componentLsb(lut.componentLsb())
{
  if (m_etScale != 0) m_setupOk = true;
}

L1GctHtMissLut::~L1GctHtMissLut()
{
}


uint16_t L1GctHtMissLut::value (const uint16_t lutAddress) const
{
  uint16_t result=0;

  if (lutAddress!=0) {
    static const int maxComponent  = 1<<kHxOrHyMissComponentNBits;
    static const int componentMask = maxComponent-1;

    static const int magnitudeMask = (1<<kHtMissMagnitudeNBits) - 1;
    static const int angleMask     = (1<<kHtMissAngleNBits)     - 1;

    // Extract the bits corresponding to hx and hy components
    int hxCompGct = static_cast<int>(lutAddress>>kHxOrHyMissComponentNBits) & componentMask;
    int hyCompGct = static_cast<int>(lutAddress) & componentMask;

    // These are twos-complement integers - if the MSB is set, the value is negative
    if (hxCompGct >= maxComponent/2) hxCompGct -= maxComponent;
    if (hyCompGct >= maxComponent/2) hyCompGct -= maxComponent;

    // Convert to GeV. Add 0.5 to each component to compensate for truncation errors.
    double hxCompGeV = m_componentLsb * (static_cast<double>(hxCompGct) + 0.5);
    double hyCompGeV = m_componentLsb * (static_cast<double>(hyCompGct) + 0.5);

    // Convert to magnitude and angle
    double htMissMag = sqrt(hxCompGeV * hxCompGeV + hyCompGeV * hyCompGeV);
    double htMissAng = atan2(hyCompGeV, hxCompGeV);
    if (htMissAng < 0.0) htMissAng += 2.0*M_PI;

    // Convert back to integer
    int htMissMagBits = static_cast<int>(m_etScale->rank(htMissMag)) & magnitudeMask;
    int htMissAngBits = static_cast<int>(htMissAng*9.0/M_PI) & angleMask;

    // Form the lut output
    result = (htMissMagBits << kHtMissAngleNBits) | htMissAngBits ;
  }

  return result;

}


std::vector<double>   L1GctHtMissLut::getThresholdsGeV() const
{
  return m_etScale->getThresholds();
}

std::vector<unsigned> L1GctHtMissLut::getThresholdsGct() const
{
  std::vector<unsigned> result;
  std::vector<double> thresholdsGeV = m_etScale->getThresholds();
  for (std::vector<double>::const_iterator thr=thresholdsGeV.begin();
       thr != thresholdsGeV.end(); thr++) {
    result.push_back(static_cast<unsigned>((*thr)/(m_componentLsb)));
  }
  return result;
}

L1GctHtMissLut L1GctHtMissLut::operator= (const L1GctHtMissLut& lut)
{
  L1GctHtMissLut temp(lut);
  return temp;
}

std::ostream& operator << (std::ostream& os, const L1GctHtMissLut& lut)
{
  os << "===L1GctHtMissLut===" << std::endl;
  std::vector<double> thresholds = lut.m_etScale->getThresholds();
  std::vector<double>::const_iterator thr = thresholds.begin();
  os << "Thresholds are: " << *(thr++);
  for ( ; thr != thresholds.end(); thr++) {
    os << ", " << *thr;
  }
  os << std::endl;
  os << "Max values for input to et scale " << lut.m_etScale->linScaleMax()
     << " and for output " << lut.m_etScale->rankScaleMax() << std::endl;
  os << "LSB used for conversion is " << lut.m_componentLsb << " GeV" << std::endl;
  os << "\n===Lookup table contents===\n" << std::endl;
  const L1GctLut<L1GctHtMissLut::NAddress,L1GctHtMissLut::NData>* temp=&lut;
  os << *temp;
  return os;
}

template class L1GctLut<L1GctHtMissLut::NAddress,L1GctHtMissLut::NData>;