GlobalVariablesTableProducer.cc

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#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/NanoAOD/interface/FlatTable.h"
#include "FWCore/Framework/interface/ConsumesCollector.h"
#include "DataFormats/Candidate/interface/Candidate.h"
 
#include <utility>
#include <vector>
#include <boost/ptr_container/ptr_vector.hpp>
 
class GlobalVariablesTableProducer : public edm::stream::EDProducer<> {
public:
  GlobalVariablesTableProducer(edm::ParameterSet const& params) {
    edm::ParameterSet const& varsPSet = params.getParameter<edm::ParameterSet>("variables");
    for (const std::string& vname : varsPSet.getParameterNamesForType<edm::ParameterSet>()) {
      const auto& varPSet = varsPSet.getParameter<edm::ParameterSet>(vname);
      const std::string& type = varPSet.getParameter<std::string>("type");
      if (type == "int")
        vars_.push_back(new IntVar(vname, nanoaod::FlatTable::IntColumn, varPSet, consumesCollector()));
      else if (type == "float")
        vars_.push_back(new FloatVar(vname, nanoaod::FlatTable::FloatColumn, varPSet, consumesCollector()));
      else if (type == "double")
        vars_.push_back(new DoubleVar(vname, nanoaod::FlatTable::FloatColumn, varPSet, consumesCollector()));
      else if (type == "bool")
        vars_.push_back(new BoolVar(vname, nanoaod::FlatTable::BoolColumn, varPSet, consumesCollector()));
      else if (type == "candidatescalarsum")
        vars_.push_back(
            new CandidateScalarSumVar(vname, nanoaod::FlatTable::FloatColumn, varPSet, consumesCollector()));
      else if (type == "candidatesize")
        vars_.push_back(new CandidateSizeVar(vname, nanoaod::FlatTable::IntColumn, varPSet, consumesCollector()));
      else if (type == "candidatesummass")
        vars_.push_back(new CandidateSumMassVar(vname, nanoaod::FlatTable::FloatColumn, varPSet, consumesCollector()));
      else
        throw cms::Exception("Configuration", "unsupported type " + type + " for variable " + vname);
    }
 
    produces<nanoaod::FlatTable>();
  }
 
  ~GlobalVariablesTableProducer() override {}
 
  void produce(edm::Event& iEvent, const edm::EventSetup& iSetup) override {
    auto out = std::make_unique<nanoaod::FlatTable>(1, "", true);
 
    for (const auto& var : vars_)
      var.fill(iEvent, *out);
 
    iEvent.put(std::move(out));
  }
 
protected:
  class Variable {
  public:
    Variable(const std::string& aname, nanoaod::FlatTable::ColumnType atype, const edm::ParameterSet& cfg)
        : name_(aname), doc_(cfg.getParameter<std::string>("doc")), type_(atype) {}
    virtual void fill(const edm::Event& iEvent, nanoaod::FlatTable& out) const = 0;
    virtual ~Variable() {}
    const std::string& name() const { return name_; }
    const nanoaod::FlatTable::ColumnType& type() const { return type_; }
 
  protected:
    std::string name_, doc_;
    nanoaod::FlatTable::ColumnType type_;
  };
  template <typename ValType>
  class Identity {
  public:
    static ValType convert(ValType x) { return x; }
  };
  template <typename ValType>
  class Size {
  public:
    static int convert(ValType x) { return x.size(); }
  };
 
  template <typename ColType, typename ValType>
  class Max {
  public:
    static ColType convert(ValType x) {
      ColType v = std::numeric_limits<ColType>::min();
      for (const auto& i : x)
        if (i > v)
          v = i;
      return v;
    }
  };
  template <typename ColType, typename ValType>
  class Min {
  public:
    static ColType convert(ValType x) {
      ColType v = std::numeric_limits<ColType>::max();
      for (const auto& i : x)
        if (i < v)
          v = i;
      return v;
    }
  };
  template <typename ColType, typename ValType>
  class ScalarPtSum {
  public:
    static ColType convert(ValType x) {
      ColType v = 0;
      for (const auto& i : x)
        v += i.pt();
      return v;
    }
  };
  template <typename ColType, typename ValType>
  class MassSum {
  public:
    static ColType convert(ValType x) {
      if (x.empty())
        return 0;
      auto v = x[0].p4();
      for (const auto& i : x)
        v += i.p4();
      return v.mass();
    }
  };
  template <typename ColType, typename ValType>
  class PtVectorSum {
  public:
    static ColType convert(ValType x) {
      if (x.empty())
        return 0;
      auto v = x[0].p4();
      v -= x[0].p4();
      for (const auto& i : x)
        v += i.p4();
      return v.pt();
    }
  };
 
  template <typename ValType, typename ColType = ValType, typename Converter = Identity<ValType>>
  class VariableT : public Variable {
  public:
    VariableT(const std::string& aname,
              nanoaod::FlatTable::ColumnType atype,
              const edm::ParameterSet& cfg,
              edm::ConsumesCollector&& cc)
        : Variable(aname, atype, cfg), src_(cc.consumes<ValType>(cfg.getParameter<edm::InputTag>("src"))) {}
    ~VariableT() override {}
    void fill(const edm::Event& iEvent, nanoaod::FlatTable& out) const override {
      edm::Handle<ValType> handle;
      iEvent.getByToken(src_, handle);
      out.template addColumnValue<ColType>(this->name_, Converter::convert(*handle), this->doc_, this->type_);
    }
 
  protected:
    edm::EDGetTokenT<ValType> src_;
  };
  typedef VariableT<int> IntVar;
  typedef VariableT<float> FloatVar;
  typedef VariableT<double, float> DoubleVar;
  typedef VariableT<bool, uint8_t> BoolVar;
  typedef VariableT<edm::View<reco::Candidate>, float, ScalarPtSum<float, edm::View<reco::Candidate>>>
      CandidateScalarSumVar;
  typedef VariableT<edm::View<reco::Candidate>, float, MassSum<float, edm::View<reco::Candidate>>> CandidateSumMassVar;
  typedef VariableT<edm::View<reco::Candidate>, int, Size<edm::View<reco::Candidate>>> CandidateSizeVar;
  boost::ptr_vector<Variable> vars_;
};
 
#include "FWCore/Framework/interface/MakerMacros.h"
DEFINE_FWK_MODULE(GlobalVariablesTableProducer);