/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/SimCalorimetry/HcalSimAlgos/interface/HcalSignalGenerator.h

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#ifndef HcalSimAlgos_HcalSignalGenerator_h
#define HcalSimAlgos_HcalSignalGenerator_h

#include "SimCalorimetry/HcalSimAlgos/interface/HcalBaseSignalGenerator.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventPrincipal.h"
#include "CalibFormats/HcalObjects/interface/HcalCoderDb.h"
#include "CalibFormats/HcalObjects/interface/HcalCalibrations.h"
#include "CalibFormats/HcalObjects/interface/HcalDbService.h"
#include "CalibFormats/HcalObjects/interface/HcalDbRecord.h"
#include "SimCalorimetry/HcalSimAlgos/interface/HcalElectronicsSim.h"
#include "SimCalorimetry/HcalSimAlgos/interface/HcalDigitizerTraits.h"
#include "DataFormats/Common/interface/Handle.h"

#include <iostream>

template<class HCALDIGITIZERTRAITS>
class HcalSignalGenerator : public HcalBaseSignalGenerator
{
public:
  typedef typename HCALDIGITIZERTRAITS::Digi DIGI;
  typedef typename HCALDIGITIZERTRAITS::DigiCollection COLLECTION;

  HcalSignalGenerator(const edm::InputTag & inputTag)
  : HcalBaseSignalGenerator(), theEvent(0), theEventPrincipal(0), theInputTag(inputTag) {}

  virtual ~HcalSignalGenerator() {}

  void initializeEvent(const edm::Event * event, const edm::EventSetup * eventSetup)
  {
    theEvent = event;
    eventSetup->get<HcalDbRecord>().get(theConditions);
    theParameterMap->setDbService(theConditions.product());
  }

  void initializeEvent(const edm::EventPrincipal * eventPrincipal, const edm::EventSetup * eventSetup)
  {
    theEventPrincipal = eventPrincipal;
    eventSetup->get<HcalDbRecord>().get(theConditions);
    theParameterMap->setDbService(theConditions.product());
  }

  virtual void fill()
  {
    theNoiseSignals.clear();
    edm::Handle<COLLECTION> pDigis;
    const COLLECTION *  digis = 0;
    // try accessing by whatever is set, Event or EventPrincipal
    if(theEvent) 
     {
      if( theEvent->getByLabel(theInputTag, pDigis) ) {
        digis = pDigis.product(); // get a ptr to the product
        LogTrace("HcalSignalGenerator") << "total # digis  for "  << theInputTag << " " <<  digis->size();
      }
      else
      {
        throw cms::Exception("HcalSignalGenerator") << "Cannot find input data " << theInputTag;
      }
    }
    else if(theEventPrincipal)
    {
       boost::shared_ptr<edm::Wrapper<COLLECTION>  const> digisPTR =
          edm::getProductByTag<COLLECTION>(*theEventPrincipal, theInputTag );
       if(digisPTR) {
          digis = digisPTR->product();
       }
    }
    else
    {
      throw cms::Exception("HcalSignalGenerator") << "No Event or EventPrincipal was set";
    }

    if (digis)
    {
      // loop over digis, adding these to the existing maps
      for(typename COLLECTION::const_iterator it  = digis->begin();
          it != digis->end(); ++it) 
      {
        // for the first signal, set the starting cap id
        if((it == digis->begin()) && theElectronicsSim)
        {
          int startingCapId = (*it)[0].capid();
          theElectronicsSim->setStartingCapId(startingCapId);
          theParameterMap->setFrameSize(it->id(), it->size());
        }

        theNoiseSignals.push_back(samplesInPE(*it));
      }
    }
  }

private:

  CaloSamples samplesInPE(const DIGI & digi)
  {
    // calibration, for future reference:  (same block for all Hcal types)
    HcalDetId cell = digi.id();
    //         const HcalCalibrations& calibrations=conditions->getHcalCalibrations(cell);
    const HcalQIECoder* channelCoder = theConditions->getHcalCoder (cell);
    const HcalQIEShape* channelShape = theConditions->getHcalShape (cell);
    HcalCoderDb coder (*channelCoder, *channelShape);
    CaloSamples result;
    coder.adc2fC(digi, result);
    fC2pe(result);
    return result;
  }

    
  const edm::Event * theEvent;
  const edm::EventPrincipal * theEventPrincipal;
  edm::ESHandle<HcalDbService> theConditions;
  edm::InputTag theInputTag;
};

typedef HcalSignalGenerator<HBHEDigitizerTraits> HBHESignalGenerator;
typedef HcalSignalGenerator<HODigitizerTraits>   HOSignalGenerator;
typedef HcalSignalGenerator<HFDigitizerTraits>   HFSignalGenerator;
typedef HcalSignalGenerator<ZDCDigitizerTraits>  ZDCSignalGenerator;

#endif