/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/RecoTauTag/HLTProducers/src/L2TauJetsMerger.cc

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#include "RecoTauTag/HLTProducers/interface/L2TauJetsMerger.h"
#include "Math/GenVector/VectorUtil.h"
#include "DataFormats/L1Trigger/interface/L1JetParticle.h"
#include "DataFormats/L1Trigger/interface/L1JetParticleFwd.h"
#include "DataFormats/HLTReco/interface/TriggerTypeDefs.h"
#include "FWCore/Utilities/interface/EDMException.h"
//
// class decleration
//
using namespace reco;
using namespace std;
using namespace edm;
using namespace l1extra;

L2TauJetsMerger::L2TauJetsMerger(const edm::ParameterSet& iConfig)
{
  jetSrc = iConfig.getParameter<vtag>("JetSrc");
  //l1ParticlesTau = iConfig.getParameter<InputTag>("L1ParticlesTau");
  //l1ParticlesJet = iConfig.getParameter<InputTag>("L1ParticlesJet");
  //tauTrigger = iConfig.getParameter<InputTag>("L1TauTrigger");
  mEt_Min = iConfig.getParameter<double>("EtMin");
  
  produces<CaloJetCollection>();
}

L2TauJetsMerger::~L2TauJetsMerger(){ }

void L2TauJetsMerger::produce(edm::Event& iEvent, const edm::EventSetup& iES)
{

 using namespace edm;
 using namespace std;
 using namespace reco;

 //Getting all the L1Seeds

 
 //Getting the Collections of L2ReconstructedJets from L1Seeds
 //and removing the collinear jets
 myL2L1JetsMap.clear();
 CaloJetCollection myTmpJets;
 myTmpJets.clear();

 int iL1Jet = 0;
 for( vtag::const_iterator s = jetSrc.begin(); s != jetSrc.end(); ++ s ) {
   edm::Handle<CaloJetCollection> tauJets;
   iEvent.getByLabel( * s, tauJets );
   for(CaloJetCollection::const_iterator iTau = tauJets->begin();iTau !=tauJets->end();iTau++)
     { 
     //Create a Map to associate to every Jet its L1SeedId, i.e. 0,1,2 or 3
       if(iTau->et() > mEt_Min) {

         //Add the Pdg Id here 
         CaloJet myJet = *iTau;
         myJet.setPdgId(15);
         myTmpJets.push_back(myJet);
       }
     }
   iL1Jet++;
 }

 std::auto_ptr<CaloJetCollection> tauL2jets(new CaloJetCollection); 

 //Removing the collinear jets correctly!

 //First sort the jets you have merged
 SorterByPt sorter;
 std::sort(myTmpJets.begin(),myTmpJets.end(),sorter);
 
//Remove Collinear Jets by prefering the highest ones!

   while(myTmpJets.size()>0) {
     tauL2jets->push_back(myTmpJets.at(0));
     CaloJetCollection tmp;
     for(unsigned int i=1 ;i<myTmpJets.size();++i) {
       double DR = ROOT::Math::VectorUtil::DeltaR(myTmpJets.at(0).p4(),myTmpJets.at(i).p4());
       if(DR>0.1) 
         tmp.push_back(myTmpJets.at(i));
     }
     myTmpJets.swap(tmp);
     tmp.clear();
   }


  iEvent.put(tauL2jets);

}