/data/refman/pasoursint/CMSSW_5_3_0/src/Validation/RecoTau/plugins/CollectionFromZLegProducer.cc

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// Includes
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/Candidate/interface/CompositeCandidate.h"

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

#include <memory>
#include <vector>
#include <sstream>

//#include "Validation/RecoTau/interface/prettyPrint.h" debugging putpose

// class definition
class CollectionFromZLegProducer : public edm::EDProducer
{
public:
  // construction/destruction
  CollectionFromZLegProducer(const edm::ParameterSet& iConfig);
  virtual ~CollectionFromZLegProducer();
  
  void produce(edm::Event& iEvent,const edm::EventSetup& iSetup);
  void endJob();

private:  
  // member data
  edm::InputTag                   srcTheZ_          ;
  std::string                     OutputCollection_ ;
  
};



// construction/destruction

//______________________________________________________________________________
CollectionFromZLegProducer::CollectionFromZLegProducer(const edm::ParameterSet& iConfig)
  : srcTheZ_(iConfig.getParameter<edm::InputTag>("ZCandidateCollection"))
{
  produces<std::vector<reco::CompositeCandidate> >("theTagLeg"  );
  produces<std::vector<reco::CompositeCandidate> >("theProbeLeg");
}


//______________________________________________________________________________
CollectionFromZLegProducer::~CollectionFromZLegProducer()
{
}

// implementation of member functions

//______________________________________________________________________________
void CollectionFromZLegProducer::produce(edm::Event& iEvent,const edm::EventSetup& iSetup)
{  
  std::auto_ptr<std::vector<reco::CompositeCandidate> > theTagLeg(new std::vector<reco::CompositeCandidate>) ;       
  std::auto_ptr<std::vector<reco::CompositeCandidate> > theProbeLeg(new std::vector<reco::CompositeCandidate>) ;             
  
  edm::Handle< std::vector<reco::CompositeCandidate> > theZHandle;
  iEvent.getByLabel(srcTheZ_,theZHandle);
  
  // this is specific for our 'tag and probe'
  
  for (std::vector<reco::CompositeCandidate>::const_iterator Zit  = theZHandle->begin() ; 
                                                             Zit != theZHandle->end()   ; 
                                                             ++Zit                      )
  {
        int c = 0;
        
        for(reco::CompositeCandidate::const_iterator Daug =(*Zit).begin(); 
                                                 Daug!=(*Zit).end()  ; 
                                                 ++Daug              )
        {
          if (c == 0){
            reco::CompositeCandidate candT(*Daug) ;
            theTagLeg->push_back(candT) ;
          }
          if (c == 1){
            reco::CompositeCandidate candP(*Daug) ;
            theProbeLeg->push_back(candP) ;
          }
          c++ ;
        }
  } 
  iEvent.put(theTagLeg  , "theTagLeg"   ) ;
  iEvent.put(theProbeLeg, "theProbeLeg" ) ;
}

void CollectionFromZLegProducer::endJob()
{
}

#include "FWCore/Framework/interface/MakerMacros.h"
DEFINE_FWK_MODULE(CollectionFromZLegProducer);