/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/MuonAnalysis/MuonAssociators/plugins/HLTL1MuonMatcher.cc

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//
// $Id: HLTL1MuonMatcher.cc,v 1.4 2013/02/27 20:42:45 wmtan Exp $
//

#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "DataFormats/Math/interface/deltaR.h"
#include "DataFormats/Math/interface/deltaPhi.h"

#include "DataFormats/Common/interface/Association.h"
#include "DataFormats/Common/interface/ValueMap.h"
#include "DataFormats/Common/interface/Ptr.h"
#include "DataFormats/Common/interface/View.h"

#include "MuonAnalysis/MuonAssociators/interface/L1MuonMatcherAlgo.h"
#include "PhysicsTools/PatAlgos/plugins/PATTriggerMatchSelector.h"

#include "DataFormats/PatCandidates/interface/TriggerObjectStandAlone.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"

namespace pat {

  class HLTL1MuonMatcher : public edm::EDProducer {
    public:
      explicit HLTL1MuonMatcher(const edm::ParameterSet & iConfig);
      virtual ~HLTL1MuonMatcher() { }

      virtual void produce(edm::Event & iEvent, const edm::EventSetup& iSetup) override;

      virtual void beginRun(const edm::Run & iRun, const edm::EventSetup& iSetup) override;


      bool operator()(const pat::TriggerObjectStandAlone &l1) const {
          if (resolveAmbiguities_ && (std::find(lockedItems_.begin(), lockedItems_.end(), &l1) != lockedItems_.end())) return false;
          return selector_(0,l1);
      }
    private:
      typedef pat::TriggerObjectStandAlone           PATPrimitive;
      typedef pat::TriggerObjectStandAloneCollection PATPrimitiveCollection;
      typedef pat::TriggerObjectStandAloneMatch      PATTriggerAssociation;

      L1MuonMatcherAlgo matcher_;

      edm::InputTag reco_, l1_;

      pat::PATTriggerMatchSelector<bool,PATPrimitive> selector_;
      bool resolveAmbiguities_;

      std::string labelProp_;

      bool writeExtraInfo_;

      template<typename Hand, typename T>
      void storeExtraInfo(edm::Event &iEvent, 
                     const Hand & handle,
                     const std::vector<T> & values,
                     const std::string    & label) const ;

      // for ambiguity resolution
      std::vector<const pat::TriggerObjectStandAlone *> lockedItems_;
  };

} // namespace

pat::HLTL1MuonMatcher::HLTL1MuonMatcher(const edm::ParameterSet & iConfig) :
    matcher_(iConfig),
    reco_(iConfig.getParameter<edm::InputTag>("src")),
    l1_(iConfig.getParameter<edm::InputTag>("matched")),
    selector_(iConfig),
    resolveAmbiguities_(iConfig.getParameter<bool>("resolveAmbiguities")),
    labelProp_(iConfig.getParameter<std::string>("setPropLabel")),
    writeExtraInfo_(iConfig.existsAs<bool>("writeExtraInfo") ? iConfig.getParameter<bool>("writeExtraInfo") : false)
{
    produces<PATPrimitiveCollection>("propagatedReco"); // reco to muon station 2
    produces<PATTriggerAssociation>("propagatedReco");  // asso reco to propagated reco
    produces<PATTriggerAssociation>();                  // asso reco to l1
    if (writeExtraInfo_) {
        produces<edm::ValueMap<float> >("deltaR");
        produces<edm::ValueMap<float> >("deltaPhi");
    }
}

void 
pat::HLTL1MuonMatcher::produce(edm::Event & iEvent, const edm::EventSetup & iSetup) {
    using namespace edm;
    using namespace std;

    Handle<View<reco::Candidate> > reco;
    Handle<PATPrimitiveCollection> l1s;

    iEvent.getByLabel(reco_, reco);
    iEvent.getByLabel(l1_, l1s);

    auto_ptr<PATPrimitiveCollection> propOut(new PATPrimitiveCollection());
    vector<int>   propMatches(reco->size(), -1);
    vector<int>   fullMatches(reco->size(), -1);
    vector<float> deltaRs(reco->size(), 999), deltaPhis(reco->size(), 999);
    lockedItems_.clear();
    for (int i = 0, n = reco->size(); i < n; ++i) {
        TrajectoryStateOnSurface propagated;
        const reco::Candidate &mu = (*reco)[i];
        int match = matcher_.matchGeneric(mu, *l1s, *this, deltaRs[i], deltaPhis[i], propagated);
        if (propagated.isValid()) {
            GlobalPoint pos = propagated.globalPosition();
            propMatches[i] = propOut->size();
            propOut->push_back(PATPrimitive(math::PtEtaPhiMLorentzVector(mu.pt(), pos.eta(), pos.phi(), mu.mass())));
            propOut->back().addFilterLabel(labelProp_);
            propOut->back().setCharge(mu.charge());
        }
        fullMatches[i] = match;
        if (match != -1) {
            lockedItems_.push_back(&(*l1s)[match]);
        }
    }
    lockedItems_.clear();

    OrphanHandle<PATPrimitiveCollection> propDone = iEvent.put(propOut, "propagatedReco");

    auto_ptr<PATTriggerAssociation> propAss(new PATTriggerAssociation(propDone));
    PATTriggerAssociation::Filler propFiller(*propAss);
    propFiller.insert(reco, propMatches.begin(), propMatches.end());
    propFiller.fill();
    iEvent.put(propAss, "propagatedReco");

    auto_ptr<PATTriggerAssociation> fullAss(new PATTriggerAssociation(l1s));
    PATTriggerAssociation::Filler fullFiller(*fullAss);
    fullFiller.insert(reco, fullMatches.begin(), fullMatches.end());
    fullFiller.fill();
    iEvent.put(fullAss);

    if (writeExtraInfo_) {
        storeExtraInfo(iEvent, reco, deltaRs,   "deltaR");
        storeExtraInfo(iEvent, reco, deltaPhis, "deltaPhi");
    }
}

template<typename Hand, typename T>
void
pat::HLTL1MuonMatcher::storeExtraInfo(edm::Event &iEvent,
                     const Hand & handle,
                     const std::vector<T> & values,
                     const std::string    & label) const {
    using namespace edm; using namespace std;
    auto_ptr<ValueMap<T> > valMap(new ValueMap<T>());
    typename edm::ValueMap<T>::Filler filler(*valMap);
    filler.insert(handle, values.begin(), values.end());
    filler.fill();
    iEvent.put(valMap, label);
}


void 
pat::HLTL1MuonMatcher::beginRun(const edm::Run & iRun, const edm::EventSetup & iSetup) {
    matcher_.init(iSetup);
}


#include "FWCore/Framework/interface/MakerMacros.h"
using namespace pat;
DEFINE_FWK_MODULE(HLTL1MuonMatcher);