JetDeltaRValueMapProducer.cc

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/* \class JetDeltaRValueMapProducer
 *
 * Associates jets using delta-R matching, and writes out
 * a valuemap of single float variables based on a StringObjectFunction. 
 * This is used for miniAOD. 
 *
 * \author: Sal Rappoccio
 *
 *
 * for more details about the cut syntax, see the documentation
 * page below:
 *
 *   https://twiki.cern.ch/twiki/bin/view/CMS/SWGuidePhysicsCutParser
 *
 *
 */


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

#include "DataFormats/JetReco/interface/Jet.h"
#include "DataFormats/JetReco/interface/PFJet.h"
#include "DataFormats/JetReco/interface/CaloJet.h"

#include "FWCore/Framework/interface/MakerMacros.h"
#include "CommonTools/Utils/interface/StringObjectFunction.h"
#include "FWCore/Framework/interface/Event.h"
#include "DataFormats/Common/interface/ValueMap.h"
#include "DataFormats/Math/interface/deltaR.h"

template < class T >
class JetDeltaRValueMapProducer : public edm::EDProducer {

public:

  typedef edm::ValueMap<float> JetValueMap;

  JetDeltaRValueMapProducer ( edm::ParameterSet const & params ) :
      srcToken_( consumes< typename edm::View<T> >( params.getParameter<edm::InputTag>("src") ) ),
      matchedToken_( consumes< typename edm::View<T> >( params.getParameter<edm::InputTag>( "matched" ) ) ),
      distMax_( params.getParameter<double>( "distMax" ) ),
      value_( params.existsAs<std::string>("value") ? params.getParameter<std::string>("value") : "" ),
      values_( params.existsAs<std::vector<std::string> >("values") ? params.getParameter<std::vector<std::string> >("values") : std::vector<std::string>() ),
      valueLabels_( params.existsAs<std::vector<std::string> >("valueLabels") ? params.getParameter<std::vector<std::string> >("valueLabels") : std::vector<std::string>() ),
      lazyParser_( params.existsAs<bool>("lazyParser") ? params.getParameter<bool>("lazyParser") : false ),
      multiValue_(false)
  {
    if( value_!="" )
    {
      evaluationMap_.insert( std::make_pair( value_, StringObjectFunction<T>( value_, lazyParser_ ) ) );
      produces< JetValueMap >();
    }

    if( valueLabels_.size()>0 || values_.size()>0 )
    {
      if( valueLabels_.size()==values_.size() )
      {
        multiValue_ = true;
        for( size_t i=0; i<valueLabels_.size(); ++i)
        {
          evaluationMap_.insert( std::make_pair( valueLabels_[i], StringObjectFunction<T>( values_[i], lazyParser_ ) ) );
          produces< JetValueMap >(valueLabels_[i]);
        }
      }
      else
        edm::LogWarning("ValueLabelMismatch") << "The number of value labels does not match the number of values. Values will not be evaluated.";
    }
  }

  virtual ~JetDeltaRValueMapProducer() {}

private:

  virtual void beginJob() override {}
  virtual void endJob() override {}

  virtual void produce(edm::Event& iEvent, const edm::EventSetup& iSetup) override {

    edm::Handle< typename edm::View<T> > h_jets1;
    iEvent.getByToken( srcToken_, h_jets1 );
    edm::Handle< typename edm::View<T> > h_jets2;
    iEvent.getByToken( matchedToken_, h_jets2 );

    std::vector<float> values( h_jets1->size(), -99999 );
    std::map<std::string, std::vector<float> > valuesMap;
    if( multiValue_ )
    {
      for( size_t i=0; i<valueLabels_.size(); ++i)
        valuesMap.insert( std::make_pair( valueLabels_[i], std::vector<float>( h_jets1->size(), -99999 ) ) );
    }
    std::vector<bool> jets1_locks( h_jets1->size(), false );

    for ( typename edm::View<T>::const_iterator ibegin = h_jets2->begin(),
          iend = h_jets2->end(), ijet = ibegin;
          ijet != iend; ++ijet )
    {
      float matched_dR2 = 1e9;
      int matched_index = -1;
     
      for ( typename edm::View<T>::const_iterator jbegin = h_jets1->begin(),
            jend = h_jets1->end(), jjet = jbegin;
            jjet != jend; ++jjet )
      {
        int index=jjet - jbegin;

        if( jets1_locks.at(index) ) continue; // skip jets that have already been matched

        float temp_dR2 = reco::deltaR2(ijet->eta(),ijet->phi(),jjet->eta(),jjet->phi());
        if ( temp_dR2 < matched_dR2 )
        {
          matched_dR2 = temp_dR2;
          matched_index = index;
        }
      }// end loop over src jets

      if( matched_index>=0 )
      {
        if ( matched_dR2 > distMax_*distMax_ )
          edm::LogWarning("MatchedJetsFarApart") << "Matched jets separated by dR greater than distMax=" << distMax_;
        else
        {
          jets1_locks.at(matched_index) = true;
          if( value_!="" )
            values.at(matched_index) = (evaluationMap_.at(value_))(*ijet);
          if( multiValue_ )
          {
            for( size_t i=0; i<valueLabels_.size(); ++i)
              valuesMap.at(valueLabels_[i]).at(matched_index) = (evaluationMap_.at(valueLabels_[i]))(*ijet);
          }
        }
      }
    }// end loop over matched jets

    if( value_!="" )
    {
      std::auto_ptr< JetValueMap > jetValueMap ( new JetValueMap() );

      JetValueMap::Filler filler(*jetValueMap);
      filler.insert(h_jets1, values.begin(), values.end());
      filler.fill();

      // put in Event
      iEvent.put(jetValueMap);
    }
    if( multiValue_ )
    {
      for( size_t i=0; i<valueLabels_.size(); ++i)
      {
        std::auto_ptr< JetValueMap > jetValueMap ( new JetValueMap() );

        JetValueMap::Filler filler(*jetValueMap);
        filler.insert(h_jets1, valuesMap.at(valueLabels_[i]).begin(), valuesMap.at(valueLabels_[i]).end());
        filler.fill();

        // put in Event
        iEvent.put(jetValueMap, valueLabels_[i]);
      }
    }
  }

  const edm::EDGetTokenT< typename edm::View<T> >  srcToken_;
  const edm::EDGetTokenT< typename edm::View<T> >  matchedToken_;
  const double                                     distMax_;
  const std::string                                value_;
  const std::vector<std::string>                   values_;
  const std::vector<std::string>                   valueLabels_;
  const bool                                       lazyParser_;
  bool                                             multiValue_;
  std::map<std::string, StringObjectFunction<T> >  evaluationMap_;
};

typedef JetDeltaRValueMapProducer<reco::Jet> RecoJetDeltaRValueMapProducer;

DEFINE_FWK_MODULE( RecoJetDeltaRValueMapProducer );