/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/RecoHI/HiJetAlgos/plugins/HiGenCleaner.cc

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// -*- C++ -*-
//
// Package:    HiGenCleaner
// Class:      HiGenCleaner
// 
//
// Original Author:  Yetkin Yilmaz
//         Created:  Tue Jul 21 04:26:01 EDT 2009
// $Id: HiGenCleaner.cc,v 1.3 2010/06/01 14:44:22 yilmaz Exp $
//
//

// system include files
#include <memory>
#include <vector>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDProducer.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "DataFormats/Common/interface/View.h"
#include "DataFormats/JetReco/interface/GenJetCollection.h"
#include "DataFormats/GeometryVector/interface/VectorUtil.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "DataFormats/HepMCCandidate/interface/GenParticleFwd.h"

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

using namespace std;
using namespace edm;


//
// class decleration
//

template <class T2>
class HiGenCleaner : public edm::EDProducer {
public:
  typedef std::vector<T2> T2Collection;
      explicit HiGenCleaner(const edm::ParameterSet&);
      ~HiGenCleaner();

   private:
      virtual void produce(edm::Event&, const edm::EventSetup&);
      // ----------member data ---------------------------

   InputTag jetSrc_;
   double deltaR_;
   double ptCut_;
   bool makeNew_;
   bool fillDummy_;

};

//
// constants, enums and typedefs
//


//
// static data member definitions
//

//
// constructors and destructor
//

template <class T2>
HiGenCleaner<T2>::HiGenCleaner(const edm::ParameterSet& iConfig) :
  jetSrc_(iConfig.getParameter<InputTag>( "src")),
  deltaR_(iConfig.getParameter<double>("deltaR")),
  ptCut_(iConfig.getParameter<double>("ptCut")),
  makeNew_(iConfig.getUntrackedParameter<bool>("createNewCollection",true)),
  fillDummy_(iConfig.getUntrackedParameter<bool>("fillDummyEntries",true))
{
   std::string alias = jetSrc_.label();
   produces<T2Collection>().setBranchAlias (alias);
}

template <class T2>
HiGenCleaner<T2>::~HiGenCleaner()
{
   // do anything here that needs to be done at desctruction time
   // (e.g. close files, deallocate resources etc.)
}


//
// member functions
//

// ------------ method called to produce the data  ------------
template <class T2>
void
HiGenCleaner<T2>::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
   using namespace edm;
   using namespace reco;

   auto_ptr<T2Collection> jets;
   jets = auto_ptr<T2Collection>(new T2Collection);
   
   edm::Handle<edm::View<T2> > genjets;
   iEvent.getByLabel(jetSrc_,genjets);

   int jetsize = genjets->size();

   vector<int> selection;
   for(int ijet = 0; ijet < jetsize; ++ijet){
      selection.push_back(-1);
   }

   vector<int> selectedIndices;
   vector<int> removedIndices;

   for(int ijet = 0; ijet < jetsize; ++ijet){

     const T2* jet1 = &((*genjets)[ijet]);
     
     if(selection[ijet] == -1){
       selection[ijet] = 1;
       for(int ijet2 = 0; ijet2 < jetsize; ++ijet2){

         if(ijet2 == ijet) continue;
         
         const T2* jet2 = &((*genjets)[ijet2]);
            
         if(Geom::deltaR(jet1->momentum(),jet2->momentum()) < deltaR_){
           if(jet1->et() < jet2->et()){
             selection[ijet] = 0;
             removedIndices.push_back(ijet);
             break;
           }else{
             selection[ijet2] = 0;
             removedIndices.push_back(ijet2);
           }
         }
         }
     }
     
     double etjet = ((*genjets)[ijet]).et();
      
      if(selection[ijet] == 1 && etjet > ptCut_){ 
         selectedIndices.push_back(ijet);
         jets->push_back(*jet1);
      }
   }
   iEvent.put(jets);

}

typedef HiGenCleaner<reco::GenParticle> HiPartonCleaner;
typedef HiGenCleaner<reco::GenJet> HiGenJetCleaner;

DEFINE_FWK_MODULE(HiPartonCleaner);
DEFINE_FWK_MODULE(HiGenJetCleaner);