CandCollectionExistFilter.cc

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#include "FWCore/Framework/interface/EDFilter.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Candidate/interface/Candidate.h"

using namespace edm;
using namespace reco;

class CandCollectionExistFilter : public EDFilter {
public:
  CandCollectionExistFilter(const ParameterSet & cfg) :
    srcToken_(consumes<CandidateView>(cfg.getParameter<InputTag>("src"))) { }
private:
  bool filter(Event& evt, const EventSetup&) override {
    Handle<CandidateView> src;
    bool exists = true;
    evt.getByToken(srcToken_, src);
    if(!src.isValid()) exists = false;
    return exists;
  }
  EDGetTokenT<CandidateView> srcToken_;
};

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

DEFINE_FWK_MODULE(CandCollectionExistFilter);