/data/refman/pasoursint/CMSSW_4_1_8_patch13/src/DQMOffline/Trigger/interface/EgHLTTrigTools.h

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#ifndef DQMOFFLINE_TRIGGER_EGHLTTRIGTOOLS
#define DQMOFFLINE_TRIGGER_EGHLTTRIGTOOLS

#include "DQMOffline/Trigger/interface/EgHLTTrigCodes.h"
#include "DataFormats/HLTReco/interface/TriggerEvent.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Math/interface/deltaR.h"

class HLTConfigProvider;

namespace egHLT {
  
  namespace trigTools {
    TrigCodes::TrigBitSet getFiltersPassed(const std::vector<std::pair<std::string,int> >& filters,const trigger::TriggerEvent* trigEvt,const std::string& hltTag);
    template<class T> void setFiltersObjPasses(std::vector<T>& objs,const std::vector<std::string>& filters,const std::vector<std::pair<std::string,std::string> >& l1PreAndSeedFilters,const TrigCodes::TrigBitSet& evtTrigBits,const trigger::TriggerEvent* trigEvt,const std::string& hltTag );
    int getMinNrObjsRequiredByFilter(const std::string& filterName); //slow function, call at begin job and cache results

    //reads hlt config and works out which are the active last filters stored in trigger summary, is sorted
    void getActiveFilters(const HLTConfigProvider& hltConfig,std::vector<std::string>& activeFilters);
    //filters a list of filternames removing any filters which are not in active filters, assumes active filters is sorted
    void filterInactiveTriggers(std::vector<std::string>& namesToFilter,const std::vector<std::string>& activeFilters);
    //filters a list of filterName1:filterName2 removing any entry for which either filter is not in activeFilters, assumes active filters is sorted
    void filterInactiveTightLooseTriggers(std::vector<std::string>& namesToFilter,const std::vector<std::string>& activeFilters);

    void translateFiltersToPathNames(const HLTConfigProvider& hltConfig,const std::vector<std::string>& filters,std::vector<std::string>& paths);
    std::string getL1SeedFilterOfPath(const HLTConfigProvider& hltConfig,const std::string& path);

    //looks for string Et and then looks for a number after that (currently the standard of all E/g triggers)
    //returns 0 if unsuccessful
    float getEtThresFromName(const std::string& trigName);
  }
  
  //I have the horrible feeling that I'm converting into an intermediatry format and then coverting back again
  //Okay how this works
  //1) create a TrigBitSet for each particle set to 0 initally
  //2) loop over each filter, for each particle that passes the filter, set the appropriate bit in the TrigBitSet
  //3) after that, loop over each particle setting the its TrigBitSet which has been calculated
  //4) because L1 pre-scaled paths are special, we only set those if an event wide trigger has been set
  template <class T>
  void trigTools::setFiltersObjPasses(std::vector<T>& particles,const std::vector<std::string>& filters,
                                      const std::vector<std::pair<std::string,std::string> >& l1PreAndSeedFilters,
                                      const TrigCodes::TrigBitSet& evtTrigBits,
                                      const trigger::TriggerEvent* trigEvt,const std::string& hltTag)
  {
    std::vector<TrigCodes::TrigBitSet> partTrigBits(particles.size());
    const double maxDeltaR=0.1;
    for(size_t filterNrInVec=0;filterNrInVec<filters.size();filterNrInVec++){
      size_t filterNrInEvt = trigEvt->filterIndex(edm::InputTag(filters[filterNrInVec],"",hltTag).encode());
      const TrigCodes::TrigBitSet filterCode = TrigCodes::getCode(filters[filterNrInVec].c_str());
      
      if(filterNrInEvt<trigEvt->sizeFilters()){ //filter found in event, something passes it
        const trigger::Keys& trigKeys = trigEvt->filterKeys(filterNrInEvt);  //trigger::Keys is actually a vector<uint16_t> holding the position of trigger objects in the trigger collection passing the filter
        const trigger::TriggerObjectCollection & trigObjColl(trigEvt->getObjects());
        for(size_t partNr=0;partNr<particles.size();partNr++){
          for(trigger::Keys::const_iterator keyIt=trigKeys.begin();keyIt!=trigKeys.end();++keyIt){
            float trigObjEta = trigObjColl[*keyIt].eta();
            float trigObjPhi = trigObjColl[*keyIt].phi();
            if (reco::deltaR(particles[partNr].eta(),particles[partNr].phi(),trigObjEta,trigObjPhi) < maxDeltaR){
            partTrigBits[partNr] |= filterCode;
            }//end dR<maxDeltaR trig obj match test
          }//end loop over all objects passing filter
        }//end loop over particles
      }//end check if filter is present
    }//end loop over all filters
    
    //okay the first element is the key, the second is the filter that exists in trigger event
    for(size_t l1FilterNrInVec=0;l1FilterNrInVec<l1PreAndSeedFilters.size();l1FilterNrInVec++){
      const TrigCodes::TrigBitSet filterCode = TrigCodes::getCode(l1PreAndSeedFilters[l1FilterNrInVec].first.c_str());
      if((filterCode&evtTrigBits)==filterCode){ //check that filter has fired in the event
   
        size_t filterNrInEvt = trigEvt->filterIndex(edm::InputTag(l1PreAndSeedFilters[l1FilterNrInVec].second,"",hltTag).encode());
        
        if(filterNrInEvt<trigEvt->sizeFilters()){ //filter found in event, something passes it
          const trigger::Keys& trigKeys = trigEvt->filterKeys(filterNrInEvt);  //trigger::Keys is actually a vector<uint16_t> holding the position of trigger objects in the trigger collection passing the filter
          const trigger::TriggerObjectCollection & trigObjColl(trigEvt->getObjects());
          for(size_t partNr=0;partNr<particles.size();partNr++){
            for(trigger::Keys::const_iterator keyIt=trigKeys.begin();keyIt!=trigKeys.end();++keyIt){
              float trigObjEta = trigObjColl[*keyIt].eta();
              float trigObjPhi = trigObjColl[*keyIt].phi();
              if (reco::deltaR(particles[partNr].eta(),particles[partNr].phi(),trigObjEta,trigObjPhi) < maxDeltaR){
                partTrigBits[partNr] |= filterCode;
              }//end dR<maxDeltaR trig obj match test
            }//end loop over all objects passing filter
          }//end loop over particles
        }//end check if filter is present
      }//end check if path has fired in the event
    }//end loop over all filters 
    
    for(size_t partNr=0;partNr<particles.size();partNr++) particles[partNr].setTrigBits(partTrigBits[partNr]);
    
  }
}  
#endif