HLTMultiplicityValueProducerFromNestedCollection.h

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#ifndef HLTrigger_JetMET_plugins_HLTMultiplicityValueProducerFromNestedCollection_h
#define HLTrigger_JetMET_plugins_HLTMultiplicityValueProducerFromNestedCollection_h
 
#include <memory>
 
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/global/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
 
template <class INP_TYPE, class OUT_TYPE>
class HLTMultiplicityValueProducerFromNestedCollection : public edm::global::EDProducer<> {
public:
  explicit HLTMultiplicityValueProducerFromNestedCollection(edm::ParameterSet const&);
  ~HLTMultiplicityValueProducerFromNestedCollection() override {}
 
  static void fillDescriptions(edm::ConfigurationDescriptions&);
 
protected:
  void produce(edm::StreamID, edm::Event&, edm::EventSetup const&) const override;
 
  edm::EDGetTokenT<INP_TYPE> const src_token_;
  OUT_TYPE const defaultValue_;
};
 
template <class INP_TYPE, class OUT_TYPE>
HLTMultiplicityValueProducerFromNestedCollection<INP_TYPE, OUT_TYPE>::HLTMultiplicityValueProducerFromNestedCollection(
    edm::ParameterSet const& iConfig)
    : src_token_(consumes<INP_TYPE>(iConfig.getParameter<edm::InputTag>("src"))),
      defaultValue_(iConfig.getParameter<OUT_TYPE>("defaultValue")) {
  produces<OUT_TYPE>();
}
 
template <class INP_TYPE, class OUT_TYPE>
void HLTMultiplicityValueProducerFromNestedCollection<INP_TYPE, OUT_TYPE>::produce(
    edm::StreamID, edm::Event& iEvent, edm::EventSetup const& iSetup) const {
  auto const& objHandle(iEvent.getHandle(src_token_));
 
  if (objHandle.isValid()) {
    LogDebug("Input") << "size of input collection: " << objHandle->size();
 
    OUT_TYPE objMult(0);
    for (auto const& obj : *objHandle) {
      objMult += obj.size();
    }
 
    LogDebug("Output") << "size of output objects: " << objMult;
 
    iEvent.put(std::make_unique<OUT_TYPE>(objMult));
  } else {
    iEvent.put(std::make_unique<OUT_TYPE>(defaultValue_));
  }
}
 
template <class INP_TYPE, class OUT_TYPE>
void HLTMultiplicityValueProducerFromNestedCollection<INP_TYPE, OUT_TYPE>::fillDescriptions(
    edm::ConfigurationDescriptions& descriptions) {
  edm::ParameterSetDescription desc;
  desc.add<edm::InputTag>("src", edm::InputTag(""))->setComment("input collection");
  desc.add<OUT_TYPE>("defaultValue", 0)->setComment("default output value (used when input collection is unavailable)");
  descriptions.addWithDefaultLabel(desc);
}
 
#endif  // HLTrigger_JetMET_plugins_HLTMultiplicityValueProducerFromNestedCollection_h