/data/refman/pasoursint/CMSSW_5_3_0/src/TrackingTools/Producers/src/SmartPropagatorESProducer.cc

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#include "TrackingTools/Producers/interface/SmartPropagatorESProducer.h"

#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/ModuleFactory.h"
#include "FWCore/Utilities/interface/Exception.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "TrackingTools/Records/interface/TrackingComponentsRecord.h"

#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"

    
using namespace edm;
using namespace std;
    
SmartPropagatorESProducer::SmartPropagatorESProducer(const ParameterSet& parameterSet) 
{
  string myname = parameterSet.getParameter<string>("ComponentName");

  string propDir = parameterSet.getParameter<string>("PropagationDirection");
  
  if (propDir == "oppositeToMomentum") thePropagationDirection = oppositeToMomentum;
  else if (propDir == "alongMomentum") thePropagationDirection = alongMomentum;
  else if (propDir == "anyDirection") thePropagationDirection = anyDirection;
  else
    throw cms::Exception("SmartPropagatorESProducer") 
      << "Wrong fit direction chosen in SmartPropagatorESProducer";


  theEpsilon = parameterSet.getParameter<double>("Epsilon");
  
  theTrackerPropagatorName = parameterSet.getParameter<string>("TrackerPropagator");
  theMuonPropagatorName = parameterSet.getParameter<string>("MuonPropagator");

  setWhatProduced(this,myname);
}

SmartPropagatorESProducer::~SmartPropagatorESProducer() {}

boost::shared_ptr<Propagator> 
SmartPropagatorESProducer::produce(const TrackingComponentsRecord& iRecord){ 

  ESHandle<MagneticField> magField;
  iRecord.getRecord<IdealMagneticFieldRecord>().get(magField);
  
  ESHandle<Propagator> trackerPropagator;
  iRecord.get(theTrackerPropagatorName,trackerPropagator);

  ESHandle<Propagator> muonPropagator;
  iRecord.get(theMuonPropagatorName,muonPropagator);
  
  
  thePropagator  = boost::shared_ptr<Propagator>(new SmartPropagator(*trackerPropagator, *muonPropagator,
                                                                     &*magField,
                                                                     thePropagationDirection, 
                                                                     theEpsilon));
  return thePropagator;
}