CandCombiner.h

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#ifndef CandAlgos_CandCombiner_h
#define CandAlgos_CandCombiner_h

#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "CommonTools/CandUtils/interface/CandCombiner.h"
#include "CommonTools/CandAlgos/interface/decayParser.h"
#include "CommonTools/Utils/interface/StringCutObjectSelector.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "CommonTools/UtilAlgos/interface/ParameterAdapter.h"
#include "CommonTools/UtilAlgos/interface/EventSetupInitTrait.h"
#include "CommonTools/Utils/interface/cutParser.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "FWCore/Utilities/interface/EDMException.h"
#include "FWCore/Utilities/interface/transform.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::stream::EDProducer<> {
      CandCombinerBase(const edm::ParameterSet & cfg) :
    setLongLived_(false),
    setMassConstraint_(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 setMassConstraint("setMassConstraint");
        found = find(vBoolParams.begin(), vBoolParams.end(), setMassConstraint) != vBoolParams.end();
        if(found) setMassConstraint_ = cfg.getParameter<bool>("setMassConstraint");
    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"); }
    tokens_ = edm::vector_transform( labels_, [this](ConjInfo const & cI){return consumes<CandidateView>(cI.tag_);} );
      }
    protected:
      std::vector<cand::parser::ConjInfo> labels_;
      std::vector<edm::EDGetTokenT<CandidateView> > tokens_;
      std::vector<int> dauCharge_;
      bool setLongLived_;
      bool setMassConstraint_;
      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, consumesCollector()),
           reco::modules::make<PairSelector>(cfg),
           Setup(cfg),
           cfg.existsAs<bool>("checkCharge")  ? cfg.getParameter<bool>("checkCharge")  : true,
           cfg.existsAs<bool>("checkOverlap") ? cfg.getParameter<bool>("checkOverlap") : true,
           dauCharge_),
      names_(cfg) {
        produces<OutputCollection>();
      }
      ~CandCombiner() override { }

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

    std::unique_ptr<OutputCollection> out = combiner_.combine(colls, names_.roles());
    if(setLongLived_ || setMassConstraint_ || setPdgId_) {
      typename OutputCollection::iterator i = out->begin(), e = out->end();
      for(; i != e; ++i) {
        names_.set(*i);
        if(setLongLived_) i->setLongLived();
        if(setMassConstraint_) i->setMassConstraint();
        if(setPdgId_) i->setPdgId(pdgId_);
      }
    }
    evt.put(std::move(out));
      }
      ::CandCombiner<Selector, PairSelector, Cloner, OutputCollection, Setup> combiner_;

      RoleNames names_;
    };

  }
}

#endif