SingleElementCollectionSelector.h

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#ifndef RecoAlgos_SingleElementCollectionSelector_h
#define RecoAlgos_SingleElementCollectionSelector_h

#include "CommonTools/UtilAlgos/interface/SelectionAdderTrait.h"
#include "CommonTools/UtilAlgos/interface/StoreContainerTrait.h"
#include "CommonTools/UtilAlgos/interface/ParameterAdapter.h"
namespace reco {
  namespace modules {
    template<typename S> struct SingleElementCollectionSelectorEventSetupInit;
  }
}
template<typename InputCollection, typename Selector, 
     typename OutputCollection = typename ::helper::SelectedOutputCollectionTrait<InputCollection>::type, 
     typename StoreContainer = typename ::helper::StoreContainerTrait<OutputCollection>::type,
     typename RefAdder = typename ::helper::SelectionAdderTrait<InputCollection, StoreContainer>::type>
struct SingleElementCollectionSelector {
  typedef InputCollection collection;
  typedef StoreContainer container;
  typedef Selector selector;
  typedef typename container::const_iterator const_iterator;
  SingleElementCollectionSelector(const edm::ParameterSet & cfg) : 
    select_(reco::modules::make<Selector>(cfg)) { }
  const_iterator begin() const { return selected_.begin(); }
  const_iterator end() const { return selected_.end(); }
  void select(const edm::Handle<InputCollection> & c, const edm::Event &, const edm::EventSetup&) {
    selected_.clear();    
    for(size_t idx = 0; idx < c->size(); ++ idx) {
      if(select_((*c)[idx])) 
    addRef_(selected_, c, idx);
    }
  }
private:
  container selected_;
  selector select_;
  RefAdder addRef_;
  friend class reco::modules::SingleElementCollectionSelectorEventSetupInit<SingleElementCollectionSelector>;
};

#include "CommonTools/UtilAlgos/interface/EventSetupInitTrait.h"

namespace reco {
  namespace modules {
    template<typename S>
    struct SingleElementCollectionSelectorEventSetupInit {
      static void init(S & s, const edm::Event & ev, const edm::EventSetup& es) { 
    typedef typename EventSetupInit<typename S::selector>::type ESI;
    ESI::init(s.select_, ev, es);
      }
    };

    template<typename I, typename S, typename O, typename C, typename R>
    struct EventSetupInit<SingleElementCollectionSelector<I, S, O, C, R> > {
      typedef SingleElementCollectionSelectorEventSetupInit<SingleElementCollectionSelector<I, S, O, C, R> > type;
    };
  }
}

#endif