/data/refman/pasoursint/CMSSW_6_1_2_SLHC2/src/RecoMuon/MuonSeedGenerator/plugins/MuonSeedGenerator.cc

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#include "RecoMuon/MuonSeedGenerator/plugins/MuonSeedGenerator.h"
#include "RecoMuon/MuonSeedGenerator/src/MuonSeedFinder.h"
#include "RecoMuon/MuonSeedGenerator/src/MuonSeedOrcaPatternRecognition.h"
#include "RecoMuon/MuonSeedGenerator/src/MuonSeedFinder.h"
#include "RecoMuon/MuonSeedGenerator/src/MuonSeedSimpleCleaner.h"


// Data Formats 
#include "DataFormats/TrajectorySeed/interface/TrajectorySeed.h"
#include "DataFormats/TrajectorySeed/interface/TrajectorySeedCollection.h"

#include "DataFormats/Common/interface/Handle.h"

#include "RecoMuon/TransientTrackingRecHit/interface/MuonTransientTrackingRecHit.h"
#include "RecoMuon/Records/interface/MuonRecoGeometryRecord.h"

// Geometry
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
#include "TrackingTools/DetLayers/interface/DetLayer.h"

#include "RecoMuon/MeasurementDet/interface/MuonDetLayerMeasurements.h"
#include "RecoMuon/DetLayers/interface/MuonDetLayerGeometry.h"
#include "RecoMuon/Records/interface/MuonRecoGeometryRecord.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"


// Framework
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"


// C++
#include <vector>

using namespace std;

typedef MuonTransientTrackingRecHit::MuonRecHitPointer MuonRecHitPointer;
typedef MuonTransientTrackingRecHit::ConstMuonRecHitPointer ConstMuonRecHitPointer;
typedef MuonTransientTrackingRecHit::MuonRecHitContainer MuonRecHitContainer;

// Constructor
MuonSeedGenerator::MuonSeedGenerator(const edm::ParameterSet& pset)
: thePatternRecognition(new MuonSeedOrcaPatternRecognition(pset)),
  theSeedFinder(new MuonSeedFinder(pset)),
  theSeedCleaner(new MuonSeedSimpleCleaner()),
  theBeamSpotTag(pset.getParameter<edm::InputTag>("beamSpotTag"))
{
  produces<TrajectorySeedCollection>(); 
}

// Destructor
MuonSeedGenerator::~MuonSeedGenerator(){
  delete thePatternRecognition;
  delete theSeedFinder;
  delete theSeedCleaner;
}


// reconstruct muon's seeds
void MuonSeedGenerator::produce(edm::Event& event, const edm::EventSetup& eSetup)
{
  // create the pointer to the Seed container
  auto_ptr<TrajectorySeedCollection> output(new TrajectorySeedCollection());
  
  edm::ESHandle<MagneticField> field;
  eSetup.get<IdealMagneticFieldRecord>().get(field);
  theSeedFinder->setBField(&*field);

  reco::BeamSpot beamSpot;
  edm::Handle<reco::BeamSpot> beamSpotHandle;
  event.getByLabel(theBeamSpotTag, beamSpotHandle);
  if ( beamSpotHandle.isValid() )
  {
    beamSpot = *beamSpotHandle;

  } else
  {
    edm::LogInfo("MuonSeedGenerator")
      << "No beam spot available from EventSetup \n";
  }

  // make it a vector so we can subtract it from position vectors
  GlobalVector gv(beamSpot.x0(), beamSpot.y0(), beamSpot.z0());
  theSeedFinder->setBeamSpot(gv);

  std::vector<MuonRecHitContainer> patterns;
  thePatternRecognition->produce(event, eSetup, patterns);

  for(std::vector<MuonRecHitContainer>::const_iterator seedSegments = patterns.begin();
      seedSegments != patterns.end(); ++seedSegments)
  {
    theSeedFinder->seeds(*seedSegments, *output);
  }

  theSeedCleaner->clean(*output);

  event.put(output);
}