/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/RecoTauTag/HLTProducers/src/VertexFromTrackProducer.cc

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#include "RecoTauTag/HLTProducers/interface/VertexFromTrackProducer.h"

#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

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

#include "DataFormats/Math/interface/Point3D.h"
#include "DataFormats/Math/interface/Error.h"
#include "DataFormats/RecoCandidate/interface/RecoCandidate.h"
#include "DataFormats/HLTReco/interface/TriggerFilterObjectWithRefs.h"
#include "DataFormats/EgammaCandidates/interface/Electron.h"
#include "DataFormats/RecoCandidate/interface/RecoChargedCandidate.h"

//using namespace reco;

//
// constants, enums and typedefs
//

//
// static data member definitions
//

//
// constructors and destructor
//
VertexFromTrackProducer::VertexFromTrackProducer(const edm::ParameterSet& conf)
  : theConfig(conf)
{
  edm::LogInfo("PVDebugInfo") 
    << "Initializing  VertexFromTrackProducer" << "\n";
  fVerbose = conf.getUntrackedParameter<bool>("verbose", false);
  trackLabel = conf.getParameter<edm::InputTag>("trackLabel");
  fIsRecoCandidate = conf.getParameter<bool>("isRecoCandidate");
  fUseBeamSpot = conf.getParameter<bool>("useBeamSpot");
  fUseVertex = conf.getParameter<bool>("useVertex");
  fUseTriggerFilterElectrons = conf.getParameter<bool>("useTriggerFilterElectrons");
  fUseTriggerFilterMuons = conf.getParameter<bool>("useTriggerFilterMuons");
  triggerFilterElectronsSrc = conf.getParameter<edm::InputTag>("triggerFilterElectronsSrc");
  triggerFilterMuonsSrc = conf.getParameter<edm::InputTag>("triggerFilterMuonsSrc");
  vertexLabel = conf.getParameter<edm::InputTag>("vertexLabel");
  beamSpotLabel = conf.getParameter<edm::InputTag>("beamSpotLabel");
 
  produces<reco::VertexCollection>();

}


VertexFromTrackProducer::~VertexFromTrackProducer() {}

//
// member functions
//

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

  std::auto_ptr<reco::VertexCollection> result(new reco::VertexCollection);
  reco::VertexCollection vColl;

  math::XYZPoint vertexPoint;
  bool vertexAvailable = false;

  // get the BeamSpot
  edm::Handle<reco::BeamSpot> recoBeamSpotHandle;
  iEvent.getByLabel(beamSpotLabel,recoBeamSpotHandle);
  if (recoBeamSpotHandle.isValid()){
    reco::BeamSpot beamSpot = *recoBeamSpotHandle;
    vertexPoint = beamSpot.position();
  }else{
    edm::LogError("UnusableBeamSpot") << "No beam spot found in Event";
  }

  if(fUseVertex)
  {
    // get the Vertex
    edm::Handle<edm::View<reco::Vertex> > recoVertexHandle;
    iEvent.getByLabel(vertexLabel,recoVertexHandle);
    if ((recoVertexHandle.isValid()) && (recoVertexHandle->size()>0)){
      reco::Vertex vertex = recoVertexHandle->at(0);
      vertexPoint = vertex.position();
      vertexAvailable = true;
    }else {
      edm::LogInfo("UnusableVertex")
        << "No vertex found in Event, beam spot used instaed" << "\n";
    }
  }

  const reco::Track* track = 0;
  if(fIsRecoCandidate)
  {
    edm::Handle<edm::View<reco::RecoCandidate> > candidateHandle;
    iEvent.getByLabel(trackLabel, candidateHandle);
    if ((candidateHandle.isValid())&&(candidateHandle->size()>0)){
      double maxpt=0.;
      unsigned i_maxpt=0;
      for (unsigned i = 0; i < candidateHandle->size(); ++i) {
        double pt=candidateHandle->ptrAt(i)->pt();
        if(pt>maxpt)
        {
          i_maxpt=i;
          maxpt=pt;
        }
      }
      track = dynamic_cast<const reco::Track*>(candidateHandle->ptrAt(i_maxpt)->bestTrack());
    }
  } 
  else if(fUseTriggerFilterElectrons) {
    edm::Handle<trigger::TriggerFilterObjectWithRefs> triggerfilter;
    iEvent.getByLabel(triggerFilterElectronsSrc, triggerfilter);
    std::vector<reco::ElectronRef> recocandidates;
    triggerfilter->getObjects(trigger::TriggerElectron,recocandidates);
    if ((recocandidates.size()>0)){
      double maxpt=0.;
      unsigned i_maxpt=0;
      for (unsigned i = 0; i < recocandidates.size(); ++i) {
        double pt=recocandidates.at(i)->pt();
        if(pt>maxpt) 
          {
            i_maxpt=i;
            maxpt=pt;
          }
        track = dynamic_cast<const reco::Track*>(recocandidates.at(i_maxpt)->bestTrack());
      }
    }
  }  
  else if(fUseTriggerFilterMuons) {
    edm::Handle<trigger::TriggerFilterObjectWithRefs> triggerfilter;
    iEvent.getByLabel(triggerFilterMuonsSrc, triggerfilter);
    std::vector<reco::RecoChargedCandidateRef> recocandidates;
    triggerfilter->getObjects(trigger::TriggerMuon,recocandidates);
    if ((recocandidates.size()>0)){
      double maxpt=0.;
      unsigned i_maxpt=0;
      for (unsigned i = 0; i < recocandidates.size(); ++i) {
        double pt=recocandidates.at(i)->pt();
        if(pt>maxpt) 
          {
            i_maxpt=i;
            maxpt=pt;
          }
        track = dynamic_cast<const reco::Track*>(recocandidates.at(i_maxpt)->bestTrack());
      }
    }
  }
  else {
    edm::Handle<edm::View<reco::Track> > trackHandle;
    iEvent.getByLabel(trackLabel, trackHandle);
    if ((trackHandle.isValid())&&(trackHandle->size()>0)){
      double maxpt=0.;
      unsigned i_maxpt=0;
      for (unsigned i = 0; i < trackHandle->size(); ++i) {
        double pt=trackHandle->ptrAt(i)->pt();
        if(pt>maxpt)
        {
          i_maxpt=i;
          maxpt=pt;
        }
      }
      track = dynamic_cast<const reco::Track*>(&*trackHandle->ptrAt(i_maxpt));
    }
  }

  if(track) {
    if(fUseBeamSpot || (fUseVertex && vertexAvailable) ) {
      vertexPoint.SetZ(vertexPoint.z()+track->dz(vertexPoint));
    }
    else {
      vertexPoint.SetZ(track->vz());
    }
  }
  math::Error<3>::type noErrors;
  reco::Vertex v(vertexPoint, noErrors);
  vColl.push_back(v);

  // provide beamspot or primary vertex if no candidate found
  //if(vColl.size()==0)
  //{
  //    math::Error<3>::type noErrors;
  //    reco::Vertex v(vertexPoint, noErrors);
  //    vColl.push_back(v);
  //}

  if(fVerbose){
    int ivtx=0;
    for(reco::VertexCollection::const_iterator v=vColl.begin(); 
        v!=vColl.end(); ++v){
      std::cout << "recvtx "<< ivtx++ 
                << " x "  << std::setw(6) << v->position().x() 
                << " dx " << std::setw(6) << v->xError()
                << " y "  << std::setw(6) << v->position().y() 
                << " dy " << std::setw(6) << v->yError()
                << " z "  << std::setw(6) << v->position().z() 
                << " dz " << std::setw(6) << v->zError()
                << std::endl;
    }
  }

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