/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/PhysicsTools/PatExamples/plugins/PatTopSelectionAnalyzer.cc

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#include <map>
#include <string>

#include "TH1.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EDAnalyzer.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "CommonTools/UtilAlgos/interface/TFileService.h"

class PatTopSelectionAnalyzer : public edm::EDAnalyzer {

public:
  explicit PatTopSelectionAnalyzer(const edm::ParameterSet&);
  ~PatTopSelectionAnalyzer();
  
private:
  virtual void beginJob() ;
  virtual void analyze(const edm::Event&, const edm::EventSetup&);
  virtual void endJob() ;

  bool booked(const std::string histName) const { return hists_.find(histName.c_str())!=hists_.end(); };
  void fill(const std::string histName, double value) const { if(booked(histName.c_str())) hists_.find(histName.c_str())->second->Fill(value); };
  
  // simple map to contain all histograms; 
  // histograms are booked in the beginJob() 
  // method
  std::map<std::string, TH1F*> hists_; 

  // input tags  
  edm::InputTag elecs_;
  edm::InputTag muons_;
  edm::InputTag jets_;
  edm::InputTag met_;
};

#include "DataFormats/PatCandidates/interface/Electron.h"
#include "DataFormats/PatCandidates/interface/Muon.h"
#include "DataFormats/PatCandidates/interface/Jet.h"
#include "DataFormats/PatCandidates/interface/MET.h"

PatTopSelectionAnalyzer::PatTopSelectionAnalyzer(const edm::ParameterSet& iConfig):
  hists_(),
  elecs_(iConfig.getUntrackedParameter<edm::InputTag>("elecs")),
  muons_(iConfig.getUntrackedParameter<edm::InputTag>("muons")),
  jets_ (iConfig.getUntrackedParameter<edm::InputTag>("jets" )),
  met_  (iConfig.getUntrackedParameter<edm::InputTag>("met"  ))
{
}

PatTopSelectionAnalyzer::~PatTopSelectionAnalyzer()
{
}

void
PatTopSelectionAnalyzer::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup)
{
  // get electron collection
  edm::Handle<edm::View<pat::Electron> > elecs;
  iEvent.getByLabel(elecs_,elecs);

  // get muon collection
  edm::Handle<edm::View<pat::Muon> > muons;
  iEvent.getByLabel(muons_,muons);

  // get jet collection
  edm::Handle<edm::View<pat::Jet> > jets;
  iEvent.getByLabel(jets_,jets);

  // get met collection  
  edm::Handle<edm::View<pat::MET> > met;
  iEvent.getByLabel(met_,met);

  // fill yield
  fill("yield", 0.5);

  // fill quantities for leading elec and elec multiplicity
  fill("elecMult", elecs->size());
  if(elecs->begin()!=elecs->end()){
    fill("elecIso", (elecs->begin()->trackIso()+elecs->begin()->caloIso())/elecs->begin()->pt());
    fill("elecPt", elecs->begin()->pt());
  }

  // fill quantities for leading muon and muon multiplicity
  fill("muonMult", muons->size());
  if(muons->begin()!=muons->end()){
    fill("muonIso", (muons->begin()->trackIso()+muons->begin()->caloIso())/muons->begin()->pt());
    fill("muonPt", muons->begin()->pt());
  }

  // fill quantities for leading jets and jet multiplicity
  // jet pt is corrected up to L3Absolute
  fill("jetMult", jets->size());
  if( jets->size()>0 ) fill("jet0Pt", (*jets)[0].pt());
  if( jets->size()>1 ) fill("jet1Pt", (*jets)[1].pt());
  if( jets->size()>2 ) fill("jet2Pt", (*jets)[2].pt());
  if( jets->size()>3 ) fill("jet3Pt", (*jets)[3].pt());

  // fill MET
  fill("met", met->empty()?0:(*met)[0].et());
}

void 
PatTopSelectionAnalyzer::beginJob()
{
  // register to the TFileService
  edm::Service<TFileService> fs;
  
  // book histograms:
  hists_["yield"   ]=fs->make<TH1F>("yield"   , "electron multiplicity",   1, 0.,   1.);
  hists_["elecMult"]=fs->make<TH1F>("elecMult", "electron multiplicity",  10, 0.,  10.);
  hists_["elecIso" ]=fs->make<TH1F>("elecIso" , "electron isolation"   ,  20, 0.,   1.);
  hists_["elecPt"  ]=fs->make<TH1F>("elecPt"  , "electron pt"          ,  30, 0., 150.);
  hists_["muonMult"]=fs->make<TH1F>("muonMult", "muon multiplicity"    ,  10, 0.,  10.);
  hists_["muonIso" ]=fs->make<TH1F>("muonIso" , "muon isolation"       ,  20, 0.,   1.);
  hists_["muonPt"  ]=fs->make<TH1F>("muonPt"  , "muon pt"              ,  30, 0., 150.);
  hists_["jetMult" ]=fs->make<TH1F>("jetMult" , "jet multiplicity"     ,  15, 0.,  15.);
  hists_["jet0Pt"  ]=fs->make<TH1F>("jet0Pt"  , "1. leading jet pt"    ,  50, 0., 250.);
  hists_["jet1Pt"  ]=fs->make<TH1F>("jet1Pt"  , "1. leading jet pt"    ,  50, 0., 250.);
  hists_["jet2Pt"  ]=fs->make<TH1F>("jet2Pt"  , "1. leading jet pt"    ,  50, 0., 200.);
  hists_["jet3Pt"  ]=fs->make<TH1F>("jet3Pt"  , "1. leading jet pt"    ,  50, 0., 200.);
  hists_["met"     ]=fs->make<TH1F>("met"     , "missing E_{T}"        ,  25, 0., 200.);
}

void 
PatTopSelectionAnalyzer::endJob() 
{
}

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