/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/PhysicsTools/HepMCCandAlgos/plugins/MCMatchCandRefSelector.cc

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#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"
#include "CommonTools/UtilAlgos/interface/EventSetupInitTrait.h"
#include "CommonTools/UtilAlgos/interface/SingleObjectRefSelector.h"
#include "CommonTools/UtilAlgos/interface/ParameterAdapter.h"

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

namespace reco {
  namespace modules {
    
    class MCMatchCandRefSelector {
    public:
      explicit MCMatchCandRefSelector(const InputTag& src) : 
        src_(src) { }
      void newEvent(const Event& evt, const EventSetup&); 
      bool operator()(const CandidateBaseRef &) const;
    private:
      InputTag src_;
      const GenParticleMatch * match_;
    };
    
    void MCMatchCandRefSelector::newEvent(const Event& evt, const EventSetup&) {
      Handle<GenParticleMatch> match;
      evt.getByLabel(src_, match);
      match_ = match.product();
    } 
    
    bool MCMatchCandRefSelector::operator()(const CandidateBaseRef & c) const {
      GenParticleRef m = (*match_)[c];
      return m.isNonnull();
    }
  
    template<>
    struct ParameterAdapter<MCMatchCandRefSelector> {
      static MCMatchCandRefSelector make(const ParameterSet & cfg) {
        return MCMatchCandRefSelector(cfg.getParameter<InputTag>("match"));
      }
    };
    
  }
}

EVENTSETUP_STD_INIT(MCMatchCandRefSelector);

typedef SingleObjectRefSelector<Candidate, reco::modules::MCMatchCandRefSelector> MCMatchCandRefSelector;

DEFINE_FWK_MODULE(MCMatchCandRefSelector);