/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/DPGAnalysis/Skims/interface/MatchedProbeMaker.h

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#ifndef PhysicsTools_TagAndProbe_MatchedProbeMaker_H
#define PhysicsTools_TagAndProbe_MatchedProbeMaker_H

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

// user include files
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/Candidate/interface/CandidateFwd.h"
#include "DataFormats/Candidate/interface/OverlapChecker.h"
#include "DataFormats/Math/interface/deltaR.h"
#include "DataFormats/Common/interface/Ref.h"
#include "DataFormats/Common/interface/RefVector.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/Candidate/interface/CandMatchMap.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

//
// class decleration
//

template< typename T >
class MatchedProbeMaker : public edm::EDProducer 
{
   public:
      typedef std::vector< T > collection;

      explicit MatchedProbeMaker(const edm::ParameterSet& iConfig);

      ~MatchedProbeMaker();
      
   private:
      virtual void beginJob() ;
      virtual void produce(edm::Event&, const edm::EventSetup&);
      virtual void endJob() ;
      
      // ----------member data ---------------------------
      edm::InputTag m_candidateSource;
      edm::InputTag m_referenceSource;
      edm::InputTag m_resMatchMapSource;

      bool matched_;    

};

template< typename T >
MatchedProbeMaker<T>::MatchedProbeMaker(const edm::ParameterSet& iConfig) :
   m_candidateSource(iConfig.getUntrackedParameter<edm::InputTag>("CandidateSource")),
   m_referenceSource(iConfig.getUntrackedParameter<edm::InputTag>("ReferenceSource")),
   m_resMatchMapSource(iConfig.getUntrackedParameter<edm::InputTag>("ResMatchMapSource",edm::InputTag("Dummy"))),
   matched_(iConfig.getUntrackedParameter< bool >("Matched",true))
{
   //register your products
   produces< edm::RefVector< collection > >();
}


template< typename T >
MatchedProbeMaker<T>::~MatchedProbeMaker(){}


template< typename T >
void MatchedProbeMaker<T>::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
  LogDebug("MatchedProbeMaker");
 
  using namespace edm;
  using namespace reco;

  std::auto_ptr< edm::RefVector< collection > > outputCollection_matched( new edm::RefVector< collection > );
  std::auto_ptr< edm::RefVector< collection > > outputCollection_unmatched(new edm::RefVector< collection > );
  
  // Get the candidates from the event
  edm::Handle< edm::RefVector< collection > > Cands;
  iEvent.getByLabel(m_candidateSource,Cands);

  edm::Handle< reco::CandidateView > Refs;
  iEvent.getByLabel(m_referenceSource,Refs);

  // Get the resolution matching map from the event
  edm::Handle<reco::CandViewMatchMap> ResMatchMap;

  if(iEvent.getByLabel(m_resMatchMapSource,ResMatchMap)){
    // Loop over the candidates looking for a match
    for (unsigned i=0; i<Cands->size(); i++) {
      const edm::Ref< collection > CandRef = (*Cands)[i];      
      reco::CandidateBaseRef candBaseRef( CandRef );
      
      // Loop over match map
      reco::CandViewMatchMap::const_iterator f = ResMatchMap->find( candBaseRef );
      if( f!=ResMatchMap->end() ) {
        outputCollection_matched->push_back(CandRef);      
      } else {
        outputCollection_unmatched->push_back(CandRef);      
      }
    }
  } else {
    OverlapChecker overlap;
    
    // Loop over the candidates looking for a match
    for (unsigned i=0; i<Cands->size(); i++) {      
      const edm::Ref< collection > CandRef = (*Cands)[i];
      //RefToBase<Candidate> CandRef(Cands, i);
      reco::CandidateBaseRef candBaseRef( CandRef );
      
      bool ppass = false;
      
      for (unsigned j=0; j<Refs->size(); j++) {
        //const edm::Ref< collection > RefRef = (*Refs)[j];
        RefToBase<Candidate> RefRef(Refs, j);
        reco::CandidateBaseRef refBaseRef( RefRef );
        
        if(overlap(*CandRef,*RefRef)) {
           ppass = true; 
        }
      }
      
      if( ppass ) outputCollection_matched->push_back(CandRef);
      else outputCollection_unmatched->push_back(CandRef);
    }  
  }
  
  if( matched_ ) iEvent.put( outputCollection_matched );
  else           iEvent.put( outputCollection_unmatched );
  
}

// ------------ method called once each job just before starting event loop  ------------
template< typename T >
void MatchedProbeMaker<T>::beginJob()
{
}

// ------------ method called once each job just after ending the event loop  ------------
template< typename T >
void MatchedProbeMaker<T>::endJob() 
{
}

#endif