/data/refman/pasoursint/CMSSW_5_3_4/src/HLTriggerOffline/Egamma/src/EmDQM.cc

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//                    Header file for this                                    //
#include "HLTriggerOffline/Egamma/interface/EmDQM.h"

//                    Collaborating Class Header                              //
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "DataFormats/HLTReco/interface/TriggerEventWithRefs.h"
#include "DataFormats/RecoCandidate/interface/RecoEcalCandidate.h"
#include "DataFormats/EgammaCandidates/interface/Electron.h"
//#include "DataFormats/EgammaCandidates/interface/Photon.h"
#include "DataFormats/L1Trigger/interface/L1EmParticle.h"
#include "DataFormats/L1Trigger/interface/L1EmParticleFwd.h"
//#include "SimDataFormats/HepMCProduct/interface/HepMCProduct.h"
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "DataFormats/Common/interface/AssociationMap.h"

#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/RefToBase.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "FWCore/Utilities/interface/Exception.h"
#include "DataFormats/HLTReco/interface/TriggerTypeDefs.h"
#include <boost/foreach.hpp>

//                           Root include files                               //
#include "TFile.h"
#include "TDirectory.h"
#include "TH1F.h"
#include <iostream>
#include <string>
#include <Math/VectorUtil.h>
using namespace ROOT::Math::VectorUtil ;


//                             Constructor                                    //
EmDQM::EmDQM(const edm::ParameterSet& pset)  
{

  dbe = edm::Service < DQMStore > ().operator->();
  dbe->setVerbose(0);

  //          Read from configuration file                  //
  dirname_="HLT/HLTEgammaValidation/"+pset.getParameter<std::string>("@module_label");
  dbe->setCurrentFolder(dirname_);

  triggerobjwithrefs = pset.getParameter<edm::InputTag>("triggerobject");
  pathIndex = pset.getUntrackedParameter<unsigned int>("pathIndex", 0);
  // parameters for generator study
  reqNum    = pset.getParameter<unsigned int>("reqNum");
  pdgGen    = pset.getParameter<int>("pdgGen");
  genEtaAcc = pset.getParameter<double>("genEtaAcc");
  genEtAcc  = pset.getParameter<double>("genEtAcc");
  // plotting parameters (untracked because they don't affect the physics)
  plotEtMin  = pset.getUntrackedParameter<double>("genEtMin",0.);
  plotPtMin  = pset.getUntrackedParameter<double>("PtMin",0.);
  plotPtMax  = pset.getUntrackedParameter<double>("PtMax",1000.);
  plotEtaMax = pset.getUntrackedParameter<double>("EtaMax", 2.7);
  plotPhiMax = pset.getUntrackedParameter<double>("PhiMax", 3.15);
  plotBins   = pset.getUntrackedParameter<unsigned int>("Nbins",40);
  plotMinEtForEtaEffPlot = pset.getUntrackedParameter<unsigned int>("minEtForEtaEffPlot", 15);
  useHumanReadableHistTitles = pset.getUntrackedParameter<bool>("useHumanReadableHistTitles", false);
  mcMatchedOnly = pset.getUntrackedParameter<bool>("mcMatchedOnly", true);
  noPhiPlots = pset.getUntrackedParameter<bool>("noPhiPlots", true);
  noIsolationPlots = pset.getUntrackedParameter<bool>("noIsolationPlots", true);
  verbosity = pset.getUntrackedParameter<unsigned int>("verbosity",0);

  //preselction cuts 
  gencutCollection_= pset.getParameter<edm::InputTag>("cutcollection");
  gencut_          = pset.getParameter<int>("cutnum");

  //         Read in the Vector of Parameter Sets.          //
  //           Information for each filter-step             //
  std::vector<edm::ParameterSet> filters = 
       pset.getParameter<std::vector<edm::ParameterSet> >("filters");

  int i = 0;
  for(std::vector<edm::ParameterSet>::iterator filterconf = filters.begin() ; filterconf != filters.end() ; filterconf++)
  {

    theHLTCollectionLabels.push_back(filterconf->getParameter<edm::InputTag>("HLTCollectionLabels"));
    theHLTOutputTypes.push_back(filterconf->getParameter<int>("theHLTOutputTypes"));
    // Grab the human-readable name, if it is not specified, use the Collection Label
    theHLTCollectionHumanNames.push_back(filterconf->getUntrackedParameter<std::string>("HLTCollectionHumanName",theHLTCollectionLabels[i].label()));

    std::vector<double> bounds = filterconf->getParameter<std::vector<double> >("PlotBounds");
    // If the size of plot "bounds" vector != 2, abort
    assert(bounds.size() == 2);
    plotBounds.push_back(std::pair<double,double>(bounds[0],bounds[1]));
    isoNames.push_back(filterconf->getParameter<std::vector<edm::InputTag> >("IsoCollections"));
    // If the size of the isoNames vector is not greater than zero, abort
    assert(isoNames.back().size()>0);
    if (isoNames.back().at(0).label()=="none") {
      plotiso.push_back(false);
    } else {
      if (!noIsolationPlots) plotiso.push_back(true);
      else plotiso.push_back(false);
    }
    nCandCuts.push_back(filterconf->getParameter<int>("ncandcut"));
    i++;
  } // END of loop over parameter sets

  // Record number of HLTCollectionLabels
  numOfHLTCollectionLabels = theHLTCollectionLabels.size();
  
}


//       method called once each job just before starting event loop          //
void 
EmDQM::beginJob()
{

}

void 
EmDQM::beginRun(edm::Run const &iRun, edm::EventSetup const &iSetup)
{
   bool changed(true);
   if (hltConf_.init(iRun, iSetup, triggerobjwithrefs.process(), changed)) {

      // if init returns TRUE, initialisation has succeeded!
   
      //edm::Service<TFileService> fs;
      dbe->setCurrentFolder(dirname_);
    
      //  Set up Histogram of Effiency vs Step.                 //
      //   theHLTCollectionLabels is a vector of InputTags      //
      //    from the configuration file.                        //
    
      std::string histName="total_eff";
      std::string histTitle = "total events passing";
      if (!mcMatchedOnly) {
         // This plot will have bins equal to 2+(number of
         //        HLTCollectionLabels in the config file)
         total = dbe->book1D(histName.c_str(),histTitle.c_str(),numOfHLTCollectionLabels+2,0,numOfHLTCollectionLabels+2);
         total->setBinLabel(numOfHLTCollectionLabels+1,"Total");
         total->setBinLabel(numOfHLTCollectionLabels+2,"Gen");
         for (unsigned int u=0; u<numOfHLTCollectionLabels; u++){total->setBinLabel(u+1,theHLTCollectionLabels[u].label().c_str());}
      }
    
      histName="total_eff_MC_matched";
      histTitle="total events passing (mc matched)";
      totalmatch = dbe->book1D(histName.c_str(),histTitle.c_str(),numOfHLTCollectionLabels+2,0,numOfHLTCollectionLabels+2);
      totalmatch->setBinLabel(numOfHLTCollectionLabels+1,"Total");
      totalmatch->setBinLabel(numOfHLTCollectionLabels+2,"Gen");
      for (unsigned int u=0; u<numOfHLTCollectionLabels; u++){totalmatch->setBinLabel(u+1,theHLTCollectionLabels[u].label().c_str());}
    
      MonitorElement* tmphisto;
      MonitorElement* tmpiso;
    
      // Set up generator-level histograms                      //
      std::string pdgIdString;
      switch(pdgGen) {
      case 11:
        pdgIdString="Electron";break;
      case 22:
        pdgIdString="Photon";break;
      default:
        pdgIdString="Particle";
      }
    
      histName = "gen_et";
      histTitle= "E_{T} of " + pdgIdString + "s" ;
      etgen =  dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,plotPtMin,plotPtMax);
      histName = "gen_eta";
      histTitle= "#eta of "+ pdgIdString +"s " ;
      etagen = dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotEtaMax,plotEtaMax);
      histName = "gen_phi";
      histTitle= "#phi of "+ pdgIdString +"s " ;
      if (!noPhiPlots) phigen = dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotPhiMax,plotPhiMax);
    
      
    
      //  Set up histograms of HLT objects                      //
    
      // Determine what strings to use for histogram titles
      std::vector<std::string> HltHistTitle;
      if ( theHLTCollectionHumanNames.size() == numOfHLTCollectionLabels && useHumanReadableHistTitles ) {
        HltHistTitle = theHLTCollectionHumanNames;
      } else {
        for (unsigned int i =0; i < numOfHLTCollectionLabels; i++) {
          HltHistTitle.push_back(theHLTCollectionLabels[i].label());
        }
      }
     
      for(unsigned int i = 0; i< numOfHLTCollectionLabels ; i++){
        if (!mcMatchedOnly) {
           // Et distribution of HLT objects passing filter i
           histName = theHLTCollectionLabels[i].label()+"et_all";
           histTitle = HltHistTitle[i]+" Et (ALL)";
           tmphisto =  dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,plotPtMin,plotPtMax);
           ethist.push_back(tmphisto);
           
           // Eta distribution of HLT objects passing filter i
           histName = theHLTCollectionLabels[i].label()+"eta_all";
           histTitle = HltHistTitle[i]+" #eta (ALL)";
           tmphisto =  dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotEtaMax,plotEtaMax);
           etahist.push_back(tmphisto);          

           if (!noPhiPlots) {
             // Phi distribution of HLT objects passing filter i
             histName = theHLTCollectionLabels[i].label()+"phi_all";
             histTitle = HltHistTitle[i]+" #phi (ALL)";
             tmphisto =  dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotPhiMax,plotPhiMax);
             phihist.push_back(tmphisto);
           }
    
     
           // Et distribution of HLT object that is closest delta-R match to sorted gen particle(s)
           histName  = theHLTCollectionLabels[i].label()+"et";
           histTitle = HltHistTitle[i]+" Et";
           tmphisto  = dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,plotPtMin,plotPtMax);
           histEtOfHltObjMatchToGen.push_back(tmphisto);
    
           // eta distribution of HLT object that is closest delta-R match to sorted gen particle(s)
           histName  = theHLTCollectionLabels[i].label()+"eta";
           histTitle = HltHistTitle[i]+" eta";
           tmphisto  = dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotEtaMax,plotEtaMax);
           histEtaOfHltObjMatchToGen.push_back(tmphisto);
    
           if (!noPhiPlots) {
             // phi distribution of HLT object that is closest delta-R match to sorted gen particle(s)
             histName  = theHLTCollectionLabels[i].label()+"phi";
             histTitle = HltHistTitle[i]+" phi";
             tmphisto  = dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotPhiMax,plotPhiMax);
             histPhiOfHltObjMatchToGen.push_back(tmphisto);
           }
       }
    
        // Et distribution of gen object matching HLT object passing filter i
        histName = theHLTCollectionLabels[i].label()+"et_MC_matched";
        histTitle = HltHistTitle[i]+" Et (MC matched)";
        tmphisto =  dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,plotPtMin,plotPtMax);
        ethistmatch.push_back(tmphisto);
        
        // Eta distribution of gen object matching HLT object passing filter i
        histName = theHLTCollectionLabels[i].label()+"eta_MC_matched";
        histTitle = HltHistTitle[i]+" #eta (MC matched)";
        tmphisto =  dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotEtaMax,plotEtaMax);
        etahistmatch.push_back(tmphisto);
    
        if (!noPhiPlots) {
          // Phi distribution of gen object matching HLT object passing filter i
          histName = theHLTCollectionLabels[i].label()+"phi_MC_matched";
          histTitle = HltHistTitle[i]+" #phi (MC matched)";
          tmphisto =  dbe->book1D(histName.c_str(),histTitle.c_str(),plotBins,-plotPhiMax,plotPhiMax);
          phihistmatch.push_back(tmphisto);
        }
    
    
        if (!plotiso[i]) {
          tmpiso = NULL;
          if (!mcMatchedOnly) {
             etahistiso.push_back(tmpiso);
             phihistiso.push_back(tmpiso);
             ethistiso.push_back(tmpiso);
             histEtaIsoOfHltObjMatchToGen.push_back(tmpiso);
             histPhiIsoOfHltObjMatchToGen.push_back(tmpiso);
             histEtIsoOfHltObjMatchToGen.push_back(tmpiso);
          }
          etahistisomatch.push_back(tmpiso);
          phihistisomatch.push_back(tmpiso);
          ethistisomatch.push_back(tmpiso);
        } else {
          if (!mcMatchedOnly) {
             // 2D plot: Isolation values vs eta for all objects
             histName  = theHLTCollectionLabels[i].label()+"eta_isolation_all";
             histTitle = HltHistTitle[i]+" isolation vs #eta (all)";
             tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,-plotEtaMax,plotEtaMax,plotBins,plotBounds[i].first,plotBounds[i].second);
             etahistiso.push_back(tmpiso);
    
             // 2D plot: Isolation values vs phi for all objects
             histName  = theHLTCollectionLabels[i].label()+"phi_isolation_all";
             histTitle = HltHistTitle[i]+" isolation vs #phi (all)";
             tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,-plotPhiMax,plotPhiMax,plotBins,plotBounds[i].first,plotBounds[i].second);
             phihistiso.push_back(tmpiso);
    
             // 2D plot: Isolation values vs et for all objects
             histName  = theHLTCollectionLabels[i].label()+"et_isolation_all";
             histTitle = HltHistTitle[i]+" isolation vs Et (all)";
             tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,plotPtMin,plotPtMax,plotBins,plotBounds[i].first,plotBounds[i].second);
             ethistiso.push_back(tmpiso);
     
             // 2D plot: Isolation values vs eta for HLT object that 
             // is closest delta-R match to sorted gen particle(s)
             histName  = theHLTCollectionLabels[i].label()+"eta_isolation";
             histTitle = HltHistTitle[i]+" isolation vs #eta";
             tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,-plotEtaMax,plotEtaMax,plotBins,plotBounds[i].first,plotBounds[i].second);
             histEtaIsoOfHltObjMatchToGen.push_back(tmpiso);
    
             // 2D plot: Isolation values vs phi for HLT object that
             // is closest delta-R match to sorted gen particle(s)
             histName  = theHLTCollectionLabels[i].label()+"phi_isolation";
             histTitle = HltHistTitle[i]+" isolation vs #phi";
             tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,-plotPhiMax,plotPhiMax,plotBins,plotBounds[i].first,plotBounds[i].second);
             histPhiIsoOfHltObjMatchToGen.push_back(tmpiso);
    
             // 2D plot: Isolation values vs et for HLT object that 
             // is closest delta-R match to sorted gen particle(s)
             histName  = theHLTCollectionLabels[i].label()+"et_isolation";
             histTitle = HltHistTitle[i]+" isolation vs Et";
             tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,plotPtMin,plotPtMax,plotBins,plotBounds[i].first,plotBounds[i].second);
             histEtIsoOfHltObjMatchToGen.push_back(tmpiso);
          }
    
          // 2D plot: Isolation values vs eta for matched objects
          histName  = theHLTCollectionLabels[i].label()+"eta_isolation_MC_matched";
          histTitle = HltHistTitle[i]+" isolation vs #eta (mc matched)";
          tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,-plotEtaMax,plotEtaMax,plotBins,plotBounds[i].first,plotBounds[i].second);
          etahistisomatch.push_back(tmpiso);
    
          // 2D plot: Isolation values vs phi for matched objects
          histName  = theHLTCollectionLabels[i].label()+"phi_isolation_MC_matched";
          histTitle = HltHistTitle[i]+" isolation vs #phi (mc matched)";
          tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,-plotPhiMax,plotPhiMax,plotBins,plotBounds[i].first,plotBounds[i].second);
          phihistisomatch.push_back(tmpiso);
    
    
          // 2D plot: Isolation values vs et for matched objects
          histName  = theHLTCollectionLabels[i].label()+"et_isolation_MC_matched";
          histTitle = HltHistTitle[i]+" isolation vs Et (mc matched)";
          tmpiso    = dbe->book2D(histName.c_str(),histTitle.c_str(),plotBins,plotPtMin,plotPtMax,plotBins,plotBounds[i].first,plotBounds[i].second);
          ethistisomatch.push_back(tmpiso);
    
        } // END of HLT histograms
    
      }

      if (changed) {
         // The HLT config has actually changed wrt the previous Run, hence rebook your
         // histograms or do anything else dependent on the revised HLT config
      }
   } else {
      // if init returns FALSE, initialisation has NOT succeeded, which indicates a problem
      // with the file and/or code and needs to be investigated!
      if (verbosity >= OUTPUT_ERRORS)
         edm::LogError("EmDQM") << " HLT config extraction failure with process name '" << triggerobjwithrefs.process() << "'.";
      // In this case, all access methods will return empty values!
   }
}

//                                Destructor                                  //
EmDQM::~EmDQM(){
}

bool EmDQM::checkGeneratedParticlesRequirement(const edm::Event & event)
{
   // Decide if this was an event of interest.               //
   //  Did the highest energy particles happen               //
   //  to have |eta| < 2.5 ?  Then continue.                 //
   edm::Handle< edm::View<reco::Candidate> > genParticles;
   event.getByLabel("genParticles", genParticles);
   if(!genParticles.isValid()) {
     if (verbosity >= OUTPUT_WARNINGS)
        edm::LogWarning("EmDQM") << "genParticles invalid.";
     return false;
   }

   std::vector<reco::LeafCandidate> allSortedGenParticles;

   for(edm::View<reco::Candidate>::const_iterator currentGenParticle = genParticles->begin(); currentGenParticle != genParticles->end(); currentGenParticle++){

     // TODO: do we need to check the states here again ?
     // in principle, there should collections produced with the python configuration
     // (other than 'genParticles') which fulfill these criteria
     if (  !( abs((*currentGenParticle).pdgId())==pdgGen  && (*currentGenParticle).status()==1 && (*currentGenParticle).et() > 2.0)  )  continue;

     reco::LeafCandidate tmpcand( *(currentGenParticle) );

     if (tmpcand.et() < plotEtMin) continue;

     allSortedGenParticles.push_back(tmpcand);
   }

   std::sort(allSortedGenParticles.begin(), allSortedGenParticles.end(),pTGenComparator_);

   // return false if not enough particles found
   if (allSortedGenParticles.size() < gencut_)
     return false;

   // additional check (this might be legacy code and we need to check
   // whether this should not be removed ?)

   // We now have a sorted collection of all generated particles
   // with pdgId = pdgGen.
   // Loop over them to see if the top gen particles have eta within acceptance
  // bool keepEvent = true;
   for (unsigned int i = 0 ; i < gencut_ ; i++ ) {
     bool inECALgap = fabs(allSortedGenParticles[i].eta()) > 1.4442 && fabs(allSortedGenParticles[i].eta()) < 1.556;
     if ( (fabs(allSortedGenParticles[i].eta()) > genEtaAcc) || inECALgap ) {
       //edm::LogWarning("EmDQM") << "Throwing event away. Gen particle with pdgId="<< allSortedGenParticles[i].pdgId() <<"; et="<< allSortedGenParticles[i].et() <<"; and eta="<< allSortedGenParticles[i].eta() <<" beyond acceptance.";
       return false;
     }
   }

   // all tests passed
   return true;
}

bool EmDQM::checkRecoParticlesRequirement(const edm::Event & event)
{
  // note that this code is very similar to the one in checkGeneratedParticlesRequirement(..)
  // and hopefully can be merged with it at some point in the future

  edm::Handle< edm::View<reco::Candidate> > referenceParticles;
  event.getByLabel(gencutCollection_,referenceParticles);
  if(!referenceParticles.isValid()) {
     if (verbosity >= OUTPUT_WARNINGS)
        edm::LogWarning("EmDQM") << "referenceParticles invalid.";
     return false;
  }

  std::vector<const reco::Candidate *> allSortedReferenceParticles;

  for(edm::View<reco::Candidate>::const_iterator currentReferenceParticle = referenceParticles->begin();
      currentReferenceParticle != referenceParticles->end();
      currentReferenceParticle++)
  {
     if ( currentReferenceParticle->et() <= 2.0)
       continue;

     // Note that for determining the overall efficiency,
     // we should only allow
     //
     // HOWEVER: for turn-on curves, we need to let
     //          more electrons pass
     if (currentReferenceParticle->et() < plotEtMin)
       continue;

     // TODO: instead of filling a new vector we could simply count here...
     allSortedReferenceParticles.push_back(&(*currentReferenceParticle));
  }

   // std::sort(allSortedReferenceParticles.begin(), allSortedReferenceParticles.end(),pTComparator_);

   // return false if not enough particles found
   return allSortedReferenceParticles.size() >= gencut_;
}


//                     method called to for each event                        //
void 
EmDQM::analyze(const edm::Event & event , const edm::EventSetup& setup)
{
  //           Check if there's enough gen particles        //
  //             of interest                                //
  edm::Handle< edm::View<reco::Candidate> > cutCounter;
  event.getByLabel(gencutCollection_,cutCounter);
  if (cutCounter->size() < (unsigned int)gencut_) {
    //edm::LogWarning("EmDQM") << "Less than "<< gencut_ <<" gen particles with pdgId=" << pdgGen;
    return;
  }


  // fill L1 and HLT info
  // get objects possed by each filter
  edm::Handle<trigger::TriggerEventWithRefs> triggerObj;
  event.getByLabel(triggerobjwithrefs,triggerObj);
  if(!triggerObj.isValid()) {
    if (verbosity >= OUTPUT_WARNINGS)
       edm::LogWarning("EmDQM") << "parameter triggerobject (" << triggerobjwithrefs << ") does not corresond to a valid TriggerEventWithRefs product. Please check especially the process name (e.g. when running over reprocessed datasets)";
    return;
  }

  // Were enough high energy gen particles found?
  if (event.isRealData())
    {
      // running validation on data.
      // TODO: we should check that the entire
      //       run is on the same type (all data or
      //       all MC). Otherwise one gets
      //       uninterpretable results...
      if (!checkRecoParticlesRequirement(event))
        return;
    }
  else
    {
      // MC
      if (!checkGeneratedParticlesRequirement(event))
        // if no, throw event away
        return;
    }


  // It was an event worth keeping. Continue.

  //  Fill the bin labeled "Total"                          //
  //   This will be the number of events looked at.         //
  if (!mcMatchedOnly) total->Fill(numOfHLTCollectionLabels+0.5);
  totalmatch->Fill(numOfHLTCollectionLabels+0.5);


  //               Fill generator info                      //
  // the gencut_ highest Et generator objects of the preselected type are our matches

  std::vector<reco::Particle> sortedGen;
  for(edm::View<reco::Candidate>::const_iterator genpart = cutCounter->begin(); genpart != cutCounter->end();genpart++){
    reco::Particle tmpcand(  genpart->charge(), genpart->p4(), genpart->vertex(),genpart->pdgId(),genpart->status() );
    if (tmpcand.et() >= plotEtMin) {
      sortedGen.push_back(tmpcand);
    }
  }
  std::sort(sortedGen.begin(),sortedGen.end(),pTComparator_ );

  // Now the collection of gen particles is sorted by pt.
  // So, remove all particles from the collection so that we 
  // only have the top "1 thru gencut_" particles in it
  if (sortedGen.size() < gencut_){
    return;
  }
  sortedGen.erase(sortedGen.begin()+gencut_,sortedGen.end());

  for (unsigned int i = 0 ; i < gencut_ ; i++ ) {
    etgen ->Fill( sortedGen[i].et()  ); //validity has been implicitily checked by the cut on gencut_ above
    if (sortedGen[i].et() > plotMinEtForEtaEffPlot) {
      etagen->Fill( sortedGen[i].eta() );
      if (!noPhiPlots) phigen->Fill( sortedGen[i].phi() );
    }
  } // END of loop over Generated particles
  if (gencut_ >= reqNum && !mcMatchedOnly) total->Fill(numOfHLTCollectionLabels+1.5); // this isn't really needed anymore keep for backward comp.
  if (gencut_ >= reqNum) totalmatch->Fill(numOfHLTCollectionLabels+1.5); // this isn't really needed anymore keep for backward comp.
          
  bool accepted = true;  // flags that the event has been accepted by all filters before
  edm::Handle<edm::TriggerResults> hltResults;
  event.getByLabel(edm::InputTag("TriggerResults","", triggerobjwithrefs.process()), hltResults);
  //            Loop over filter modules                    //
  for(unsigned int n=0; n < numOfHLTCollectionLabels ; n++) {
    // check that there are not less sortedGen particles than nCandCut requires for this filter
    if (sortedGen.size() < nCandCuts.at(n)) {
       if (verbosity >= OUTPUT_ERRORS)
          edm::LogError("EmDQM") << "There are less generated particles than the module '" << theHLTCollectionLabels[n].label() << "' requires.";
       continue;
    }
    std::vector<reco::Particle> sortedGenForFilter(sortedGen);
    sortedGenForFilter.erase(sortedGenForFilter.begin() + nCandCuts.at(n), sortedGenForFilter.end());

    // Fill only if this filter was run.
    if (pathIndex != 0 && hltConf_.moduleIndex(pathIndex, theHLTCollectionLabels[n].label()) > hltResults->index(pathIndex)) break;
    // These numbers are from the Parameter Set, such as:
    //   theHLTOutputTypes = cms.uint32(100)
    switch(theHLTOutputTypes[n]) 
    {
      case trigger::TriggerL1NoIsoEG: // Non-isolated Level 1
        fillHistos<l1extra::L1EmParticleCollection>(triggerObj,event,n,sortedGenForFilter,accepted);break;
      case trigger::TriggerL1IsoEG: // Isolated Level 1
        fillHistos<l1extra::L1EmParticleCollection>(triggerObj,event,n,sortedGenForFilter,accepted);break;
      case trigger::TriggerPhoton: // Photon 
        fillHistos<reco::RecoEcalCandidateCollection>(triggerObj,event,n,sortedGenForFilter,accepted);break;
      case trigger::TriggerElectron: // Electron 
        fillHistos<reco::ElectronCollection>(triggerObj,event,n,sortedGenForFilter,accepted);break;
      case trigger::TriggerCluster: // TriggerCluster
        fillHistos<reco::RecoEcalCandidateCollection>(triggerObj,event,n,sortedGenForFilter,accepted);break;
      default: 
        throw(cms::Exception("Release Validation Error") << "HLT output type not implemented: theHLTOutputTypes[n]" );
    }
  } // END of loop over filter modules
}


// fillHistos                                                                 //
//   Called by analyze method.                                                //
template <class T> void EmDQM::fillHistos(edm::Handle<trigger::TriggerEventWithRefs>& triggerObj,const edm::Event& iEvent ,unsigned int n,std::vector<reco::Particle>& sortedGen, bool &accepted)
{
  std::vector<edm::Ref<T> > recoecalcands;
  if ( ( triggerObj->filterIndex(theHLTCollectionLabels[n])>=triggerObj->size() )){ // only process if available
    hltCollectionLabelsMissed.insert(theHLTCollectionLabels[n].encode());
    accepted = false;
    return;
  }

  hltCollectionLabelsFound.insert(theHLTCollectionLabels[n].encode());

  //      Retrieve saved filter objects                     //
  triggerObj->getObjects(triggerObj->filterIndex(theHLTCollectionLabels[n]),theHLTOutputTypes[n],recoecalcands);
  //Danger: special case, L1 non-isolated
  // needs to be merged with L1 iso
  if (theHLTOutputTypes[n] == trigger::TriggerL1NoIsoEG){
    std::vector<edm::Ref<T> > isocands;
    triggerObj->getObjects(triggerObj->filterIndex(theHLTCollectionLabels[n]),trigger::TriggerL1IsoEG,isocands);
    if (isocands.size()>0) 
      {
        for (unsigned int i=0; i < isocands.size(); i++)
          recoecalcands.push_back(isocands[i]);
      }
  } // END of if theHLTOutputTypes == 82
  

  if (recoecalcands.size() < 1){ // stop if no object passed the previous filter
    accepted = false;
    return;
  }

  //if (recoecalcands.size() >= reqNum ) 
  if (recoecalcands.size() >= nCandCuts.at(n) && !mcMatchedOnly) 
    total->Fill(n+0.5);

  // check for validity                            //
  // prevents crash in CMSSW_3_1_0_pre6            //
  for (unsigned int j=0; j<recoecalcands.size(); j++){
    if(!( recoecalcands.at(j).isAvailable())){
      if (verbosity >= OUTPUT_ERRORS)
         edm::LogError("EmDQMInvalidRefs") << "Event content inconsistent: TriggerEventWithRefs contains invalid Refs. Invalid refs for: " << theHLTCollectionLabels[n].label() << ". The collection that this module uses may has been dropped in the event.";
      return;
    }
  }

  if (!mcMatchedOnly) {
    // Loop over the Generated Particles, and find the        //
    // closest HLT object match.                              //
    //for (unsigned int i=0; i < gencut_; i++) {
    for (unsigned int i=0; i < nCandCuts.at(n); i++) {
      math::XYZVector currentGenParticleMomentum = sortedGen[i].momentum();

      float closestDeltaR = 0.5;
      int closestEcalCandIndex = -1;
      for (unsigned int j=0; j<recoecalcands.size(); j++) {
        float deltaR = DeltaR(recoecalcands[j]->momentum(),currentGenParticleMomentum);

        if (deltaR < closestDeltaR) {
          closestDeltaR = deltaR;
          closestEcalCandIndex = j;
        }
      }

      // If an HLT object was found within some delta-R
      // of this gen particle, store it in a histogram
      if ( closestEcalCandIndex >= 0 ) {
        histEtOfHltObjMatchToGen[n] ->Fill( recoecalcands[closestEcalCandIndex]->et()  );
        histEtaOfHltObjMatchToGen[n]->Fill( recoecalcands[closestEcalCandIndex]->eta() );
        if (!noPhiPlots) histPhiOfHltObjMatchToGen[n]->Fill( recoecalcands[closestEcalCandIndex]->phi() );
        
        // Also store isolation info
        if (n+1 < numOfHLTCollectionLabels){ // can't plot beyond last
          if (plotiso[n+1] ){  // only plot if requested in config
            for (unsigned int j =  0 ; j < isoNames[n+1].size() ;j++  ){
              edm::Handle<edm::AssociationMap<edm::OneToValue< T , float > > > depMap; 
              iEvent.getByLabel(isoNames[n+1].at(j),depMap);
              if (depMap.isValid()){ //Map may not exist if only one candidate passes a double filter
                typename edm::AssociationMap<edm::OneToValue< T , float > >::const_iterator mapi = depMap->find(recoecalcands[closestEcalCandIndex]);
                if (mapi!=depMap->end()) {  // found candidate in isolation map! 
                  histEtaIsoOfHltObjMatchToGen[n+1]->Fill( recoecalcands[closestEcalCandIndex]->eta(),mapi->val);
                  histPhiIsoOfHltObjMatchToGen[n+1]->Fill( recoecalcands[closestEcalCandIndex]->phi(),mapi->val);
                  histEtIsoOfHltObjMatchToGen[n+1] ->Fill( recoecalcands[closestEcalCandIndex]->et(), mapi->val);
                }
              }
            }
          }
        }
      } // END of if closestEcalCandIndex >= 0
    }

    //  Loop over all HLT objects in this filter step, and    //
    //  fill histograms.                                      //
    //  bool foundAllMatches = false;
    //  unsigned int numOfHLTobjectsMatched = 0;
    for (unsigned int i=0; i<recoecalcands.size(); i++) {
      //float closestGenParticleDr = 99.0;
      //for(unsigned int j =0; j < gencut_; j++) {
      //  math::XYZVector currentGenParticle = sortedGen[j].momentum();

      //  double currentDeltaR = DeltaR(recoecalcands[i]->momentum(),currentGenParticle);
      //  if ( currentDeltaR < closestGenParticleDr ) {
      //    closestGenParticleDr = currentDeltaR;
      //  }
      //}
      //if ( !(fabs(closestGenParticleDr < 0.3)) ) continue;
   
      //numOfHLTobjectsMatched++;
      //if (numOfHLTobjectsMatched >= gencut_) foundAllMatches=true;

      // Fill HLT object histograms
      ethist[n] ->Fill(recoecalcands[i]->et() );
      etahist[n]->Fill(recoecalcands[i]->eta() );
      if (!noPhiPlots) phihist[n]->Fill(recoecalcands[i]->phi() );

      //  Plot isolation variables (show the not-yet-cut        //
      //  isolation, i.e. associated to next filter)            //
      if ( n+1 < numOfHLTCollectionLabels ) { // can't plot beyond last
        if (plotiso[n+1]) {
          for (unsigned int j =  0 ; j < isoNames[n+1].size() ;j++  ){
            edm::Handle<edm::AssociationMap<edm::OneToValue< T , float > > > depMap; 
            iEvent.getByLabel(isoNames[n+1].at(j),depMap);
            if (depMap.isValid()){ //Map may not exist if only one candidate passes a double filter
              typename edm::AssociationMap<edm::OneToValue< T , float > >::const_iterator mapi = depMap->find(recoecalcands[i]);
              if (mapi!=depMap->end()){  // found candidate in isolation map! 
                etahistiso[n+1]->Fill(recoecalcands[i]->eta(),mapi->val);
                phihistiso[n+1]->Fill(recoecalcands[i]->phi(),mapi->val);
                ethistiso[n+1]->Fill(recoecalcands[i]->et(),mapi->val);
              }
            }
          }
        }
      } // END of if n+1 < then the number of hlt collections
    }
  }


  //        Fill mc matched objects into histograms         //
  unsigned int mtachedMcParts = 0;
  float mindist=0.3;
  if(n==0) mindist=0.5; //low L1-resolution => allow wider matching 
  for(unsigned int i =0; i < nCandCuts.at(n); ++i){
    //match generator candidate
    bool matchThis= false;
    math::XYZVector candDir=sortedGen[i].momentum();
    unsigned int closest = 0;
    double closestDr = 1000.;
    for(unsigned int trigOb = 0 ; trigOb < recoecalcands.size(); ++trigOb){
      double dr = DeltaR(recoecalcands[trigOb]->momentum(),candDir);
      if (dr < closestDr) {
        closestDr = dr;
        closest = trigOb;
      }
      if (closestDr > mindist) { // it's not really a "match" if it's that far away
        closest = -1;
      } else {
        mtachedMcParts++;
        matchThis = true;
      }
    }
    if ( !matchThis ) {
      accepted = false;
      continue; // only plot matched candidates
    }
    // fill coordinates of mc particle matching trigger object
    ethistmatch[n] ->Fill( sortedGen[i].et()  );
    if (sortedGen[i].et() > plotMinEtForEtaEffPlot) {
      etahistmatch[n]->Fill( sortedGen[i].eta() );
      if (!noPhiPlots) phihistmatch[n]->Fill( sortedGen[i].phi() );
    }
    //  Plot isolation variables (show the not-yet-cut        //
    //  isolation, i.e. associated to next filter)            //
    if (n+1 < numOfHLTCollectionLabels){ // can't plot beyond last
      if (plotiso[n+1] ){  // only plot if requested in config
        for (unsigned int j =  0 ; j < isoNames[n+1].size() ;j++  ){
          edm::Handle<edm::AssociationMap<edm::OneToValue< T , float > > > depMap; 
          iEvent.getByLabel(isoNames[n+1].at(j),depMap);
          if (depMap.isValid()){ //Map may not exist if only one candidate passes a double filter
            typename edm::AssociationMap<edm::OneToValue< T , float > >::const_iterator mapi = depMap->find(recoecalcands[closest]);
            if (mapi!=depMap->end()){  // found candidate in isolation map!
              // Only make efficiency plot using photons with some min Et
              etahistisomatch[n+1]->Fill(sortedGen[i].eta(),mapi->val);
              phihistisomatch[n+1]->Fill(sortedGen[i].phi(),mapi->val);
              ethistisomatch[n+1]->Fill(sortedGen[i].et(),mapi->val);
            }
          }
        }
      }
    } // END of if n+1 < then the number of hlt collections
  }
  // fill total mc matched efficiency

  if (mtachedMcParts >= nCandCuts.at(n) && accepted == true)
    totalmatch->Fill(n+0.5);
}

void 
EmDQM::endRun(edm::Run const &iRun, edm::EventSetup const &iSetup)
{
  // print information about hltCollectionLabels which were not found
  // (but only those which were never found)

  // check which ones were never found
  std::vector<std::string> labelsNeverFound;
  

  // for (std::set<edm::InputTag>::const_iterator it = hltCollectionLabelsMissed.begin(); it != hltCollectionLabelsMissed.end(); ++it)
  BOOST_FOREACH(const edm::InputTag &tag, hltCollectionLabelsMissed)
  {
    if (hltCollectionLabelsFound.count(tag.encode()) == 0)
      // never found
      labelsNeverFound.push_back(tag.encode());

  } // loop over all tags which were missed at least once

  if (labelsNeverFound.empty())
    return;

  std::sort(labelsNeverFound.begin(), labelsNeverFound.end());

  // there was at least one label which was never found
  // (note that this could also be because the corresponding
  // trigger path slowly fades out to zero efficiency)
  if (verbosity >= OUTPUT_WARNINGS)
     edm::LogWarning("EmDQM") << "There were some HLTCollectionLabels which were never found:";

  BOOST_FOREACH(const edm::InputTag &tag, labelsNeverFound)
  {
    if (verbosity >= OUTPUT_ALL)
       edm::LogPrint("EmDQM") << "  " << tag;
  }
}

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

}

//----------------------------------------------------------------------

DEFINE_FWK_MODULE(EmDQM);