/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/PhysicsTools/IsolationAlgos/interface/IsolationProducerNew.h

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#ifndef IsolationAlgos_IsolationProducer_h
#define IsolationAlgos_IsolationProducer_h
/* \class IsolationProducer<C1, C2, Algo>
 *
 * \author Francesco Fabozzi, INFN
 *
 * template class to store isolation
 *
 */
#include "CommonTools/UtilAlgos/interface/ParameterAdapter.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/ParameterSet/interface/ParameterSetfwd.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "DataFormats/Common/interface/ValueMap.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/Event.h"
#include "DataFormats/Common/interface/Handle.h"
#include "CommonTools/UtilAlgos/interface/MasterCollectionHelper.h"
#include <vector>

namespace helper {

  template<typename Alg>
  struct NullIsolationAlgorithmSetup {
    static void init( Alg &, const edm::EventSetup& ) { }
  };

  template<typename Alg>
  struct IsolationAlgorithmSetup {
    typedef NullIsolationAlgorithmSetup<Alg> type;
  };
}

namespace reco {
  namespace modulesNew {

    template <typename C1, typename C2, typename Alg, 
              typename OutputCollection = edm::ValueMap<float>,
              typename Setup = typename helper::IsolationAlgorithmSetup<Alg>::type>
    class IsolationProducer : public edm::EDProducer {
    public:
      IsolationProducer( const edm::ParameterSet & );
      ~IsolationProducer();
      
    private:
      void produce( edm::Event&, const edm::EventSetup& );
      edm::InputTag src_, elements_;
      Alg alg_;
    };
    
    template <typename C1, typename C2, typename Alg, typename OutputCollection, typename Setup>
    IsolationProducer<C1, C2, Alg, OutputCollection, Setup>::IsolationProducer( const edm::ParameterSet & cfg ) :
      src_( cfg.template getParameter<edm::InputTag>( "src" ) ),
      elements_( cfg.template getParameter<edm::InputTag>( "elements" ) ),
      alg_( reco::modules::make<Alg>( cfg ) ) {
      produces<OutputCollection>();
    }
    
    template <typename C1, typename C2, typename Alg, typename OutputCollection, typename Setup>
    IsolationProducer<C1, C2, Alg, OutputCollection, Setup>::~IsolationProducer() {
    }
    
    template <typename C1, typename C2, typename Alg, typename OutputCollection, typename Setup>
    void IsolationProducer<C1, C2, Alg, OutputCollection, Setup>::produce( edm::Event& evt, const edm::EventSetup& es ) {
      using namespace edm;
      using namespace std;
      Handle<C1> src;
      Handle<C2> elements;
      evt.getByLabel(src_, src);
      evt.getByLabel(elements_, elements);
      
      Setup::init(alg_, es);
      
      ::helper::MasterCollection<C1> master(src);
      auto_ptr<OutputCollection> isolations(new OutputCollection);
      if(src->size()!= 0) {
        typename OutputCollection::Filler filler(*isolations);
        vector<double> iso(master.size(),-1);
        size_t i = 0;
        for( typename C1::const_iterator lep = src->begin(); lep != src->end(); ++ lep )
          iso[master.index(i++)] = alg_(*lep, *elements); 
        filler.insert(master.get(), iso.begin(), iso.end());
        filler.fill();
      }
      evt.put( isolations );
    }

  }
}

#endif