/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/JetMETCorrections/TauJet/plugins/TauJetCorrectorExample.cc

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// -*- C++ -*-
//
// Package:    TauJetCorrectorExample
// Class:      TauJetCorrectorExample
// 
// system include files
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDAnalyzer.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"

// necessary objects:
#include "FWCore/Framework/interface/ESHandle.h"
#include "DataFormats/JetReco/interface/CaloJetCollection.h"
#include "DataFormats/JetReco/interface/CaloJet.h"

#include "JetMETCorrections/TauJet/interface/TauJetCorrector.h"
//#include "JetMETCorrections/TauJet/interface/JetCalibratorTauJet.h"
#include "JetMETCorrections/Objects/interface/JetCorrector.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/BTauReco/interface/IsolatedTauTagInfo.h"
#include "DataFormats/JetReco/interface/Jet.h"
#include <DataFormats/Common/interface/RefVector.h>
#include <DataFormats/Common/interface/RefVectorIterator.h>
#include <DataFormats/Common/interface/Ref.h>
// basic cpp:

// basic cpp:
#include <iostream>
#include <string>
// some root includes
#include <TFile.h>
#include <TH1D.h>
#include <TMath.h>
#include <TTree.h>
#include <TLorentzVector.h>
#include <TVector3.h>

//
// class decleration
//
class TauJetCorrectorExample : public edm::EDAnalyzer {
public:
  explicit TauJetCorrectorExample(const edm::ParameterSet&);
  ~TauJetCorrectorExample();
  
  
private:
  virtual void beginJob() ;
  virtual void analyze(const edm::Event&, const edm::EventSetup&);
  virtual void endJob() ;
  
  // ----------member data ---------------------------
  std::string jetname;
  std::string tauname;
  std::string tauCorrectorname;
  
  int nEvt;// used to count the number of events
  int njets;
  
  JetCorrector* taucorrector; 

};


//
// constants, enums and typedefs
//

//
// static data member definitions
//

//
// constructors and destructor
//

using namespace reco;

TauJetCorrectorExample::TauJetCorrectorExample(const edm::ParameterSet& iConfig):
  jetname(iConfig.getUntrackedParameter<std::string>("JetHandle","iterativeCone5CaloJets")),
  tauname(iConfig.getUntrackedParameter<std::string>("TauHandle","coneIsolation")),
  tauCorrectorname(iConfig.getUntrackedParameter<std::string>("tauCorrHandle", "TauJetCorrectorIcone5")),
  nEvt(0), njets(0), taucorrector(0)
{
  //now do what ever initialization is needed

}


TauJetCorrectorExample::~TauJetCorrectorExample()
{
 
  // do anything here that needs to be done at desctruction time
  // (e.g. close files, deallocate resources etc.)

}


//
// member functions
//

// ------------ method called to for each event  ------------
void
TauJetCorrectorExample::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup)
{
  taucorrector = const_cast<JetCorrector*>(JetCorrector::getJetCorrector(tauCorrectorname, iSetup));

  using namespace edm;
  
#ifdef THIS_IS_AN_EVENT_EXAMPLE
  Handle<ExampleData> pIn;
  iEvent.getByLabel("example",pIn);
#endif
   
#ifdef THIS_IS_AN_EVENTSETUP_EXAMPLE
  ESHandle<SetupData> pSetup;
  iSetup.get<SetupRecord>().get(pSetup);
#endif
  using namespace edm;

  // this analyzer produces a small root file with basic candidates and some MC information
  // some additional print statements
  ++nEvt;
  if((nEvt%10==0 && nEvt<=100)||(nEvt%100==0 && nEvt>100))
    std::cout << "reading event " << nEvt << std::endl;

  // get taus
  Handle<reco::IsolatedTauTagInfoCollection> tauTagInfoHandle;
  iEvent.getByLabel(tauname,tauTagInfoHandle);
  reco::IsolatedTauTagInfoCollection::const_iterator tau=tauTagInfoHandle->begin();
  
  //get tau jet corrector
  //const JetCorrector* taucorrector = JetCorrector::getJetCorrector(tauCorrectorname, iSetup);

  //  std::cout << "setting everything to 0 just before tau loop" << std::endl;
  njets=0;

    std::cout << "starting tau loop" << std::endl;
    for(tau=tauTagInfoHandle->begin();tau!=tauTagInfoHandle->end() && njets<10;++tau) {

        //Should check tau discriminator, but not done here

                double pt = tau->jet().get()->et();
        
                //correction returns correction factor which must then be applied to original ET
                double scale = taucorrector->correction(tau->jet().get()->p4());
                double ptcorr = tau->jet().get()->et() * scale;
       
                std::cout << "Tau jet: Original Et = " << pt << " Corrected Et = " << ptcorr << std::endl;

                ++njets;
        }


}



// ------------ method called once each job just before starting event loop  ------------
void 
//TauJetCorrectorExample::beginJob(const edm::EventSetup& iSetup)
TauJetCorrectorExample::beginJob()
{
        
//      taucorrector = const_cast<JetCorrector*>(JetCorrector::getJetCorrector(tauCorrectorname, iSetup));
        
}

// ------------ method called once each job just after ending the event loop  ------------
void 
TauJetCorrectorExample::endJob() { 
}

//define this as a plug-in
DEFINE_FWK_MODULE(TauJetCorrectorExample);