/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/HLTriggerOffline/Tau/src/HLTTauRefCombiner.cc

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#include "HLTriggerOffline/Tau/interface/HLTTauRefCombiner.h"
#include "Math/GenVector/VectorUtil.h"



using namespace edm;
using namespace std;

HLTTauRefCombiner::HLTTauRefCombiner(const edm::ParameterSet& iConfig)
{
  inputColl_   = iConfig.getParameter< std::vector<InputTag> >("InputCollections");
  matchDeltaR_ = iConfig.getParameter<double>("MatchDeltaR");
  outName_     = iConfig.getParameter<string>("OutputCollection");

  produces<LorentzVectorCollection> ( outName_);
}

HLTTauRefCombiner::~HLTTauRefCombiner(){ }

void HLTTauRefCombiner::produce(edm::Event& iEvent, const edm::EventSetup& iES)
{
    auto_ptr<LorentzVectorCollection> out_product(new LorentzVectorCollection);

    //Create The Handles..
    std::vector< Handle<LorentzVectorCollection> > handles;

    bool allCollectionsExist = true;
    //Map the Handles to the collections if all collections exist
    for(size_t i = 0;i<inputColl_.size();++i)
      {
        edm::Handle<LorentzVectorCollection> tmp;
        if(iEvent.getByLabel(inputColl_[i],tmp))
          {
            handles.push_back(tmp);
          }
        else
          {
            allCollectionsExist = false;
          }

      }

    //The reference output object collection will be the first one..
    if(allCollectionsExist)
      {
        //loop on the first collection
        for(size_t i = 0; i < (handles[0])->size();++i)
          {
            bool MatchedObj = true;

            //get reference Vector
            const LorentzVector lvRef = (*(handles[0]))[i];
            
            //Loop on all other collections and match
                for(size_t j = 1; j < handles.size();++j)
                  {
                    if(!match(lvRef,*(handles[j])))
                      MatchedObj = false;

                  }
                
                //If the Object is Matched Everywhere store
                if(MatchedObj)
                  {
                    out_product->push_back(lvRef);
                  }


          }

        //Put product to file
        iEvent.put(out_product,outName_);

      }
    
    


}



bool 
HLTTauRefCombiner::match(const LorentzVector& lv,const LorentzVectorCollection& lvcol)
{
 bool matched=false;

 if(lvcol.size()>0)
  for(LorentzVectorCollection::const_iterator it = lvcol.begin();it!=lvcol.end();++it)
   {
          double delta = ROOT::Math::VectorUtil::DeltaR(lv,*it);
          if(delta<matchDeltaR_)
            {
              matched=true;
             
            }
   }



 return matched;
}