/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/PhysicsTools/RecoUtils/plugins/HLTEventSelector.cc

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#include "PhysicsTools/RecoUtils/plugins/HLTEventSelector.h"

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

#include "DataFormats/Common/interface/TriggerResults.h"
#include "FWCore/Common/interface/TriggerNames.h"

HLTEventSelector::HLTEventSelector (const edm::ParameterSet& pset){
  // input collection
  triggerResults_ = pset.getParameter<edm::InputTag>("triggerResults");
  // trigger path names
  pathNames_ = pset.getParameter< std::vector<std::string> >("pathNames");

  edm::LogInfo("HLTEventSelector") << "constructed with \n"
                                   << "  src = " << triggerResults_ << "\n"
                                   << "  #pathnames = " << pathNames_.size();
}

bool
HLTEventSelector::select (const edm::Event& event) const
{
  //
  // get the trigger results and check validity
  //
  edm::Handle<edm::TriggerResults> hltHandle;
  event.getByLabel(triggerResults_, hltHandle);
  if ( !hltHandle.isValid() ) {
    edm::LogWarning("HLTEventSelector") << "No trigger results for InputTag " << triggerResults_;
    return false;
  }
  //
  // get results
  //
  const edm::TriggerNames & trgNames = event.triggerNames(*hltHandle);
  unsigned int trgSize = trgNames.size();
//   static int first(true);
//   if ( first ) {
//     first = false;
//     std::cout << "Trigger menu" << std::endl;
//     for ( unsigned int i=0; i<trgSize; ++i ) {
//       std::cout << trgNames.triggerName(i) << std::endl;
//     }
//   }
//
// example for OR of all specified triggers
//
  for ( std::vector<std::string>::const_iterator i=pathNames_.begin();
        i!=pathNames_.end(); ++i ) {
    // get index
    unsigned int index = trgNames.triggerIndex(*i);
    if ( index==trgSize ) {
      edm::LogWarning("HLTEventSelector") << "Unknown trigger name " << *i;
//       return false;
      continue;
    }
//     if ( !hltHandle->accept(index) )  return false;
    if ( hltHandle->accept(index) ) {
      LogDebug("HLTEventSelector") << "Event selected by " << *i;
      return true;
    }
  }
//   return true;
  LogDebug("HLTEventSelector") << "Event rejected";
  return false;
}