/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/CommonTools/RecoUtils/plugins/PFCand_NoPU_WithAM.cc

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// -*- C++ -*-
//
// Package:    PFCand_NoPU_WithAM
// Class:      PFCand_NoPU_WithAM
// 
//
// Original Author:  Matthias Geisler,32 4-B20,+41227676487,
//         Created:  Thu Dec  1 16:07:41 CET 2011
// $Id: PFCand_NoPU_WithAM.cc,v 1.6 2012/12/20 13:14:12 mgeisler Exp $
//
//
#include "CommonTools/RecoUtils/interface/PFCand_NoPU_WithAM.h"

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

// user include files

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

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

#include "DataFormats/Common/interface/View.h"

#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TrackReco/interface/TrackBase.h"
   
using namespace edm;
using namespace std;
using namespace reco;

//
// constructors and destructor
//
PFCand_NoPU_WithAM::PFCand_NoPU_WithAM(const edm::ParameterSet& iConfig)
{
   //now do what ever other initialization is needed

        input_AssociationType_ = iConfig.getParameter<InputTag>("AssociationType");

        input_VertexPFCandAssociationMap_ = iConfig.getParameter<InputTag>("VertexPFCandAssociationMap");

        input_VertexCollection_ = iConfig.getParameter<InputTag>("VertexCollection");

        input_MinQuality_ = iConfig.getParameter<int>("MinQuality");

   //register your products

        if ( input_AssociationType_.label() == "PFCandsToVertex" ) {
          produces<PFCandidateCollection>("P2V");
        } else {
          if ( input_AssociationType_.label() == "VertexToPFCands" ) {
            produces<PFCandidateCollection>("V2P");
          } else {
            if ( input_AssociationType_.label() == "Both" ) {
              produces<PFCandidateCollection>("P2V");
              produces<PFCandidateCollection>("V2P");
            } else {
              cout << "No correct InputTag for AssociationType!" << endl;
              cout << "Won't produce any PFCandiateCollection!" << endl;
            }
          }
        }
  
}


PFCand_NoPU_WithAM::~PFCand_NoPU_WithAM()
{
 
   // 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  ------------
void
PFCand_NoPU_WithAM::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{

        auto_ptr<PFCandidateCollection> p2v_firstvertex(new PFCandidateCollection() );
        auto_ptr<PFCandidateCollection> v2p_firstvertex(new PFCandidateCollection() );

        bool p2vassmap = false;
        bool v2passmap = false;
  
        //get the input vertex<->pf-candidate association map
        Handle<PFCandToVertexAssMap> p2vAM;
        Handle<VertexToPFCandAssMap> v2pAM;
        
        string asstype = input_AssociationType_.label();

        if ( ( asstype == "PFCandsToVertex" ) || ( asstype == "Both" ) ) {
          if ( iEvent.getByLabel(input_VertexPFCandAssociationMap_, p2vAM ) ) {
            p2vassmap = true;
          }
        }

        if ( ( asstype == "VertexToPFCands" ) || ( asstype == "Both" ) ) {
          if ( iEvent.getByLabel(input_VertexPFCandAssociationMap_, v2pAM ) ) {
            v2passmap = true;
          }
        }

        if ( !p2vassmap && !v2passmap ) {
          cout << "No input collection could be found" << endl;
          return;
        }

        int negativeQuality = 0;
        if ( input_MinQuality_ >= 2) {
          negativeQuality = -1;
        } else {
          if ( input_MinQuality_ == 1) {
            negativeQuality = -2;
          } else{
            negativeQuality = -3;
          } 
        } 

        if ( p2vassmap ){

          const PFCandQualityPairVector pfccoll = p2vAM->begin()->val;

          //get the candidates associated to the first vertex and store them in a pf-candidate collection
          for (unsigned int pfccoll_ite = 0; pfccoll_ite < pfccoll.size(); pfccoll_ite++){
     
            PFCandidateRef pfcand = pfccoll[pfccoll_ite].first;
            int quality = pfccoll[pfccoll_ite].second;

            if ( (quality>=input_MinQuality_) || ( (quality<0) && (quality>=negativeQuality) ) ) { 
              p2v_firstvertex->push_back(*pfcand);

            }

          }

          iEvent.put( p2v_firstvertex, "P2V" );

        } 

        if ( v2passmap ) {
 
          //get the input vertex collection
          Handle<VertexCollection> input_vtxcollH;
          iEvent.getByLabel(input_VertexCollection_,input_vtxcollH);

          VertexRef firstVertexRef(input_vtxcollH,0);

          VertexToPFCandAssMap::const_iterator v2p_ite;

          for(v2p_ite=v2pAM->begin(); v2p_ite!=v2pAM->end(); v2p_ite++){

            PFCandidateRef pfcand = v2p_ite->key;
    
            for(unsigned v_ite = 0; v_ite<(v2p_ite->val).size(); v_ite++){

              VertexRef vtxref = (v2p_ite->val)[v_ite].first;
              int quality = (v2p_ite->val)[v_ite].second;

              if ( (vtxref==firstVertexRef) && ( (quality>=input_MinQuality_) || ( (quality<0) && (quality>=negativeQuality) ) ) ) {
                 v2p_firstvertex->push_back(*pfcand);
              }

            }

          }

          iEvent.put( v2p_firstvertex, "V2P" );

        }
}

// ------------ method fills 'descriptions' with the allowed parameters for the module  ------------
void
PFCand_NoPU_WithAM::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
  //The following says we do not know what parameters are allowed so do no validation
  // Please change this to state exactly what you do use, even if it is no parameters
  edm::ParameterSetDescription desc;
  desc.setUnknown();
  descriptions.addDefault(desc);
}

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