UniqueMerger.h

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#ifndef UtilAlgos_UniqueMerger_h
#define UtilAlgos_UniqueMerger_h

#include "FWCore/Framework/interface/global/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/transform.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/Common/interface/CloneTrait.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <vector>

template <typename InputCollection,
          typename OutputCollection = InputCollection,
          typename P = typename edm::clonehelper::CloneTrait<InputCollection>::type>
class UniqueMerger : public edm::global::EDProducer<> {
public:
  typedef std::set<typename OutputCollection::value_type> set_type;
  explicit UniqueMerger(const edm::ParameterSet&);
  ~UniqueMerger() override;

private:
  void produce(edm::StreamID, edm::Event&, const edm::EventSetup&) const override;
  typedef std::vector<edm::EDGetTokenT<InputCollection> > vtoken;
  vtoken srcToken_;
  bool skipNulls_;
  bool warnOnSkip_;
};

template <typename InputCollection, typename OutputCollection, typename P>
UniqueMerger<InputCollection, OutputCollection, P>::UniqueMerger(const edm::ParameterSet& par)
    : srcToken_(edm::vector_transform(par.template getParameter<std::vector<edm::InputTag> >("src"),
                                      [this](edm::InputTag const& tag) { return consumes<InputCollection>(tag); })),
      skipNulls_(par.getParameter<bool>("skipNulls")),
      warnOnSkip_(par.getParameter<bool>("warnOnSkip")) {
  produces<OutputCollection>();
}

template <typename InputCollection, typename OutputCollection, typename P>
UniqueMerger<InputCollection, OutputCollection, P>::~UniqueMerger() {}

template <typename InputCollection, typename OutputCollection, typename P>
void UniqueMerger<InputCollection, OutputCollection, P>::produce(edm::StreamID,
                                                                 edm::Event& evt,
                                                                 const edm::EventSetup&) const {
  set_type coll_set;
  for (auto const& s : srcToken_) {
    for (auto const& c : evt.get(s)) {
      if (!skipNulls_ || (c.isNonnull() && c.isAvailable())) {
        coll_set.emplace(P::clone(c));
      } else if (warnOnSkip_) {
        edm::LogWarning("InvalidPointer") << "Found an invalid pointer. Will not merge to collection.";
      }
    }
  }
  std::unique_ptr<OutputCollection> coll(new OutputCollection(coll_set.size()));
  std::copy(coll_set.begin(), coll_set.end(), coll->begin());
  evt.put(std::move(coll));
}

#endif