/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/RecoVertex/BeamSpotProducer/plugins/BeamSpotProducer.cc

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#include "RecoVertex/BeamSpotProducer/interface/BeamSpotProducer.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"

#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/IOVSyncValue.h"
#include "CondFormats/DataRecord/interface/BeamSpotObjectsRcd.h"
#include "CondFormats/BeamSpotObjects/interface/BeamSpotObjects.h"

#include "DataFormats/Math/interface/Error.h"
#include "DataFormats/Math/interface/Point3D.h"

//
// constructors and destructor
//
BeamSpotProducer::BeamSpotProducer(const edm::ParameterSet& iConf) {
        
        edm::LogInfo("RecoVertex/BeamSpotProducer") 
                << "Initializing Beam Spot producer " << "\n";
  
        //fVerbose=conf.getUntrackedParameter<bool>("verbose", false);
        
        produces<reco::BeamSpot>();

}


BeamSpotProducer::~BeamSpotProducer() {}

//
// member functions
//

// ------------ method called to produce the data  ------------
void
BeamSpotProducer::produce(edm::Event& iEvent, const edm::EventSetup& iSetup) {
        
        using namespace edm;

        std::auto_ptr<reco::BeamSpot> result(new reco::BeamSpot);

        reco::BeamSpot aSpot;

        
        //typedef math::XYZPoint Point;
    //enum { dimension = 7 };
    //typedef math::Error<dimension>::type CovarianceMatrix;

        
        //try {
        edm::LogInfo("RecoVertex/BeamSpotProducer") 
          << "Reconstructing event number: " << iEvent.id() << "\n";

        edm::ESHandle< BeamSpotObjects > beamhandle;
        iSetup.get<BeamSpotObjectsRcd>().get(beamhandle);
        const BeamSpotObjects *spotDB = beamhandle.product();

        // translate from BeamSpotObjects to reco::BeamSpot
        reco::BeamSpot::Point apoint( spotDB->GetX(), spotDB->GetY(), spotDB->GetZ() );
                
        reco::BeamSpot::CovarianceMatrix matrix;
        for ( int i=0; i<7; ++i ) {
          for ( int j=0; j<7; ++j ) {
            matrix(i,j) = spotDB->GetCovariance(i,j);
          }
        }
        
        // this assume beam width same in x and y
        aSpot = reco::BeamSpot( apoint,
                                spotDB->GetSigmaZ(),
                                spotDB->Getdxdz(),
                                spotDB->Getdydz(),
                                spotDB->GetBeamWidthX(),
                                matrix );
        aSpot.setBeamWidthY( spotDB->GetBeamWidthY() );
        aSpot.setEmittanceX( spotDB->GetEmittanceX() );
        aSpot.setEmittanceY( spotDB->GetEmittanceY() );
        aSpot.setbetaStar( spotDB->GetBetaStar() );
                
        //}
        //
        //catch (std::exception & err) {
        //      edm::LogInfo("RecoVertex/BeamSpotProducer") 
        //              << "Exception during event number: " << iEvent.id() 
        //              << "\n" << err.what() << "\n";
        //}

        *result = aSpot;
        
        iEvent.put(result);
        
}

//define this as a plug-in
DEFINE_FWK_MODULE(BeamSpotProducer);