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CandCombiner.h

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#ifndef CandAlgos_CandCombiner_h
#define CandAlgos_CandCombiner_h

#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "PhysicsTools/CandUtils/interface/CandCombiner.h"
#include "PhysicsTools/CandAlgos/interface/decayParser.h"
#include "PhysicsTools/Utilities/interface/StringCutObjectSelector.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "PhysicsTools/UtilAlgos/interface/ParameterAdapter.h"
#include "PhysicsTools/UtilAlgos/interface/EventSetupInitTrait.h"
#include "PhysicsTools/Utilities/interface/cutParser.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include <string>
#include <vector>
#include <algorithm>

namespace edm {
  class ParameterSet;
}

namespace reco {
  namespace modules {
    
    
    struct RoleNames {
      explicit RoleNames(const edm::ParameterSet & cfg) {

        if ( cfg.exists("name") )
          name_ = cfg.getParameter<std::string>("name");
        else
          name_ = "";
        if ( cfg.exists("roles") )
          roles_ = cfg.getParameter<std::vector<std::string> >("roles");
        else
          roles_ = std::vector<std::string>();
      }
      const std::vector<std::string> roles() const { return roles_; }
      void set(reco::CompositeCandidate &c) const {
        c.setName(name_);
        c.setRoles(roles_);
        c.applyRoles();
      } 
    private:
      std::string name_;
      // Name of the roles
      std::vector<std::string> roles_;
    };

    
    struct CandCombinerBase : public edm::EDProducer {
      CandCombinerBase(const edm::ParameterSet & cfg) :
        setLongLived_(false), 
        setPdgId_(false) {
        using namespace cand::parser;
        using namespace std;
        string decay(cfg.getParameter<string>("decay"));
        if(decayParser(decay, labels_))
          for(vector<ConjInfo>::iterator label = labels_.begin();
               label != labels_.end(); ++label)
        if(label->mode_ == ConjInfo::kPlus)
          dauCharge_.push_back(1);
        else if (label->mode_ == ConjInfo::kMinus)
          dauCharge_.push_back(-1);
        else
          dauCharge_.push_back(0);
        else
          throw edm::Exception(edm::errors::Configuration,
                               "failed to parse \"" + decay + "\"");
        
        int lists = labels_.size();
        if(lists != 2 && lists != 3)
          throw edm::Exception(edm::errors::LogicError,
                               "invalid number of collections");
        bool found;
        const string setLongLived("setLongLived");
        vector<string> vBoolParams = cfg.getParameterNamesForType<bool>();
        found = find(vBoolParams.begin(), vBoolParams.end(), setLongLived) != vBoolParams.end();
        if(found) setLongLived_ = cfg.getParameter<bool>("setLongLived");
        const string setPdgId("setPdgId");
        vector<string> vIntParams = cfg.getParameterNamesForType<int>();
        found = find(vIntParams.begin(), vIntParams.end(), setPdgId) != vIntParams.end();
        if(found) { setPdgId_ = true; pdgId_ = cfg.getParameter<int>("setPdgId"); }
      }
    protected:
      std::vector<cand::parser::ConjInfo> labels_;
      std::vector<int> dauCharge_;
      bool setLongLived_;
      bool setPdgId_;
      int pdgId_;
    };
    
    template<typename Selector, 
             typename PairSelector = AnyPairSelector,
             typename Cloner = ::combiner::helpers::NormalClone, 
             typename OutputCollection = reco::CompositeCandidateCollection,
             typename Setup = AddFourMomenta,
             typename Init = typename ::reco::modules::EventSetupInit<Setup>::type         
            >
    class CandCombiner : public CandCombinerBase {
      public:
      explicit CandCombiner(const edm::ParameterSet & cfg) :
        CandCombinerBase(cfg),
        combiner_(reco::modules::make<Selector>(cfg), 
                   reco::modules::make<PairSelector>(cfg),
                   Setup(cfg), 
                   checkCharge(cfg), 
                   dauCharge_),
      names_(cfg) {
        produces<OutputCollection>();
      }
      virtual ~CandCombiner() { }

    private:
      void produce(edm::Event& evt, const edm::EventSetup& es) {
        using namespace std;
        using namespace reco;
        Init::init(combiner_.setup(), evt, es);
        int n = labels_.size();
        vector<edm::Handle<CandidateView> > colls(n);
        for(int i = 0; i < n; ++i)
          evt.getByLabel(labels_[i].tag_, colls[i]);

        auto_ptr<OutputCollection> out = combiner_.combine(colls, names_.roles());
        if(setLongLived_ || setPdgId_) {
          typename OutputCollection::iterator i = out->begin(), e = out->end();
          for(; i != e; ++i) {
            names_.set(*i);
            if(setLongLived_) i->setLongLived();
            if(setPdgId_) i->setPdgId(pdgId_);
          }
        }
        evt.put(out);
      }
      bool checkCharge(const edm::ParameterSet & cfg) const {
        using namespace std;
        const string par("checkCharge");
        vector<string> bools = cfg.getParameterNamesForType<bool>();
        bool found = find(bools.begin(), bools.end(), "checkCharge") != bools.end();
        if (found) return cfg.getParameter<bool>(par);
        // default: check charge
        return true;
      }
      ::CandCombiner<Selector, PairSelector, Cloner, OutputCollection, Setup> combiner_;

      RoleNames names_;
    };

  }
}

#endif

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