/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/PhysicsTools/TagAndProbe/plugins/ObjectViewMatcher.cc

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/*****************************************************************************
 * Project: CMS detector at the CERN
 *
 * Package: PhysicsTools/TagAndProbe
 *
 *
 * Authors:
 *
 *   Kalanand Mishra, Fermilab - kalanand@fnal.gov
 *
 * Description:
 *   - Matches a given object with other objects using deltaR-matching.
 *   - For example: can match a photon with track within a given deltaR.
 *   - Saves collection of the reference vectors of matched objects.
 * History:
 *   
 *
 *****************************************************************************/
// Includes
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "DataFormats/Common/interface/View.h"
#include "DataFormats/Math/interface/deltaR.h"

#include "DataFormats/MuonReco/interface/Muon.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectron.h"
#include "DataFormats/EgammaCandidates/interface/Electron.h"
#include "DataFormats/JetReco/interface/Jet.h"
#include "DataFormats/EgammaCandidates/interface/Photon.h"
#include "DataFormats/TrackReco/interface/Track.h"

#include "CommonTools/Utils/interface/StringCutObjectSelector.h"


#include <memory>
#include <vector>
#include <sstream>


// class definition
template<typename T1, typename T2>
class ObjectViewMatcher : public edm::EDProducer
{
public:
  // construction/destruction
  ObjectViewMatcher(const edm::ParameterSet& iConfig);
  virtual ~ObjectViewMatcher();
  
  // member functions
  void produce(edm::Event& iEvent,const edm::EventSetup& iSetup) override;
  void endJob();

private:  
  // member data
  edm::InputTag              srcCands_;
  std::vector<edm::InputTag> srcObjects_;
  double                     deltaRMax_;
  
  std::string  moduleLabel_;

  StringCutObjectSelector<T1,true> objCut_; // lazy parsing, to allow cutting on variables not in reco::Candidate class
  StringCutObjectSelector<T2,true> objMatchCut_; // lazy parsing, to allow cutting on variables not in reco::Candidate class


  unsigned int nObjectsTot_;
  unsigned int nObjectsMatch_;
};



// construction/destruction

//______________________________________________________________________________
template<typename T1, typename T2>
ObjectViewMatcher<T1, T2>::ObjectViewMatcher(const edm::ParameterSet& iConfig)
  : srcCands_    (iConfig.getParameter<edm::InputTag>         ("srcObject"))
  , srcObjects_ (iConfig.getParameter<std::vector<edm::InputTag> >("srcObjectsToMatch"))
  , deltaRMax_  (iConfig.getParameter<double>                ("deltaRMax"))
  , moduleLabel_(iConfig.getParameter<std::string>                ("@module_label"))
  , objCut_(iConfig.existsAs<std::string>("srcObjectSelection") ? iConfig.getParameter<std::string>("srcObjectSelection") : "", true)
  ,objMatchCut_(iConfig.existsAs<std::string>("srcObjectsToMatchSelection") ? iConfig.getParameter<std::string>("srcObjectsToMatchSelection") : "", true)
  , nObjectsTot_(0)
  , nObjectsMatch_(0)
{
  produces<std::vector<T1> >();
}


//______________________________________________________________________________
template<typename T1, typename T2>
ObjectViewMatcher<T1, T2>::~ObjectViewMatcher(){}



// implementation of member functions

//______________________________________________________________________________
template<typename T1, typename T2>
void ObjectViewMatcher<T1, T2>::produce(edm::Event& iEvent,const edm::EventSetup& iSetup)
{
  std::auto_ptr<std::vector<T1> > cleanObjects(new std::vector<T1 >);

  edm::Handle<edm::View<T1> > candidates;
  iEvent.getByLabel(srcCands_,candidates);
  
  bool* isMatch = new bool[candidates->size()];
  for (unsigned int iObject=0;iObject<candidates->size();iObject++) isMatch[iObject] = false;
  
  for (unsigned int iSrc=0;iSrc<srcObjects_.size();iSrc++) {
    edm::Handle<edm::View<T2> > objects;
    iEvent.getByLabel(srcObjects_[iSrc],objects);
   
    if(objects->size()==0) continue;
 
    for (unsigned int iObject=0;iObject<candidates->size();iObject++) {
      const T1& candidate = candidates->at(iObject);
      if (!objCut_(candidate)) continue;


      for (unsigned int iObj=0;iObj<objects->size();iObj++) {
        const T2& obj = objects->at(iObj);
        if (!objMatchCut_(obj)) continue;
        double deltaR = reco::deltaR(candidate,obj);
        if (deltaR<deltaRMax_)  isMatch[iObject] = true;
      }
    } 
  }
  

  
  unsigned int counter=0;
  typename edm::View<T1>::const_iterator tIt, endcands = candidates->end();
  for (tIt = candidates->begin(); tIt != endcands; ++tIt, ++counter) {
    if(isMatch[counter]) cleanObjects->push_back( *tIt );  
  }

  nObjectsTot_  +=candidates->size();
  nObjectsMatch_+=cleanObjects->size();

  delete [] isMatch;  
  iEvent.put(cleanObjects);
}


//______________________________________________________________________________
template<typename T1, typename T2>
void ObjectViewMatcher<T1, T2>::endJob()
{
  std::stringstream ss;
  ss<<"nObjectsTot="<<nObjectsTot_<<" nObjectsMatched="<<nObjectsMatch_
    <<" fObjectsMatch="<<100.*(nObjectsMatch_/(double)nObjectsTot_)<<"%\n";
  std::cout<<"++++++++++++++++++++++++++++++++++++++++++++++++++"
           <<"\n"<<moduleLabel_<<"(ObjectViewMatcher) SUMMARY:\n"<<ss.str()
           <<"++++++++++++++++++++++++++++++++++++++++++++++++++"
           << std::endl;
}


// plugin definition

typedef ObjectViewMatcher<reco::Photon, reco::Track>      TrackMatchedPhotonProducer;
typedef ObjectViewMatcher<reco::Jet, reco::Track>         TrackMatchedJetProducer;

#include "FWCore/Framework/interface/MakerMacros.h"
DEFINE_FWK_MODULE(TrackMatchedPhotonProducer);
DEFINE_FWK_MODULE(TrackMatchedJetProducer);