StringCutEventSelector.h

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#ifndef _StringCutEventSelector
#define _StringCutEventSelector

#include "FWCore/Framework/interface/ConsumesCollector.h"
#include "CommonTools/UtilAlgos/interface/EventSelector.h"
#include "CommonTools/UtilAlgos/interface/InputTagDistributor.h"
#include "CommonTools/Utils/interface/StringCutObjectSelector.h"
#include "CommonTools/Utils/interface/StringObjectFunction.h"
#include "FWCore/ServiceRegistry/interface/Service.h"

template <typename Object, bool any = false>
class StringCutEventSelector : public EventSelector {
public:
  StringCutEventSelector(const edm::ParameterSet& pset, edm::ConsumesCollector&& iC)
      : StringCutEventSelector(pset, iC) {}
  StringCutEventSelector(const edm::ParameterSet& pset, edm::ConsumesCollector& iC)
      : EventSelector(pset, iC),
        src_(edm::Service<InputTagDistributorService>()->retrieve("src", pset)),
        srcToken_(iC.consumes<edm::View<Object> >(src_)),
        f_(pset.getParameter<std::string>("cut")),
        //put this guy to 0 to do the check on "all" object in the collection
        nFirst_(pset.getParameter<unsigned int>("nFirst")),
        order_(nullptr) {
    std::stringstream ss;
    ss << "string cut based selection on collection: " << src_;
    description_.push_back(ss.str());
    ss.str("");
    description_.push_back(std::string("selection cut is: ") + pset.getParameter<std::string>("cut"));
    if (pset.exists("order"))
      order_ = new StringObjectFunction<Object>(pset.getParameter<std::string>("order"));
  }

  bool select(const edm::Event& e) const override {
    edm::Handle<edm::View<Object> > oH;
    e.getByToken(srcToken_, oH);
    std::vector<const Object*> copyToSort(oH->size());
    for (uint i = 0; i != oH->size(); ++i)
      copyToSort[i] = &(*oH)[i];
    if (order_)
      std::sort(copyToSort.begin(), copyToSort.end(), sortByStringFunction<Object>(order_));

    //reject events if not enough object in collection
    //      if ((nFirst_!=0) && (oH->size()<nFirst_)) return false;
    unsigned int i = 0;
    unsigned int found = 0;
    for (; i != oH->size(); i++) {
      const Object& o = *(copyToSort[i]);
      if (any) {
        if (f_(o))
          ++found;
        if (found >= nFirst_)
          return true;
      } else {
        //stop doing the check if reaching too far in the collection
        if ((nFirst_ != 0) && (i >= nFirst_))
          break;
        if (!f_(o))
          return false;
      }
    }
    return !any;
  }

private:
  edm::InputTag src_;
  edm::EDGetTokenT<edm::View<Object> > srcToken_;
  StringCutObjectSelector<Object> f_;
  unsigned int nFirst_;
  StringObjectFunction<Object>* order_;
};

template <typename Object, bool existenceMatter = true>
class StringCutsEventSelector : public EventSelector {
public:
  StringCutsEventSelector(const edm::ParameterSet& pset, edm::ConsumesCollector&& iC)
      : StringCutsEventSelector(pset, iC) {}
  StringCutsEventSelector(const edm::ParameterSet& pset, edm::ConsumesCollector& iC)
      : EventSelector(pset, iC),
        src_(edm::Service<InputTagDistributorService>()->retrieve("src", pset)),
        srcToken_(iC.consumes<edm::View<Object> >(src_)),
        order_(nullptr) {
    std::vector<std::string> selection = pset.getParameter<std::vector<std::string> >("cut");
    std::stringstream ss;
    ss << "string cut based selection on collection: " << src_;
    description_.push_back(ss.str());
    ss.str("");
    description_.push_back("selection cuts are:");
    for (unsigned int i = 0; i != selection.size(); i++)
      if (selection[i] != "-") {
        f_.push_back(new StringCutObjectSelector<Object>(selection[i]));
        ss << "[" << i << "]: " << selection[i];
        description_.push_back(ss.str());
        ss.str("");
      } else {
        f_.push_back(nullptr);
        ss << "[" << i << "]: no selection";
        description_.push_back(ss.str());
        ss.str("");
      }
    if (pset.exists("order"))
      order_ = new StringObjectFunction<Object>(pset.getParameter<std::string>("order"));
  }
  ~StringCutsEventSelector() override {
    unsigned int i = 0;
    for (; i != f_.size(); i++)
      if (f_[i]) {
        delete f_[i];
        f_[i] = nullptr;
      }
    if (order_)
      delete order_;
  }

  bool select(const edm::Event& e) const override {
    edm::Handle<edm::View<Object> > oH;
    e.getByToken(srcToken_, oH);
    std::vector<const Object*> copyToSort(oH->size());
    for (uint i = 0; i != oH->size(); ++i)
      copyToSort[i] = &(*oH)[i];
    if (order_)
      std::sort(copyToSort.begin(), copyToSort.end(), sortByStringFunction<Object>(order_));

    unsigned int i = 0;
    if (existenceMatter && oH->size() < f_.size())
      return false;
    for (; i != f_.size(); i++) {
      if (!existenceMatter && i == oH->size())
        break;
      if (!f_[i])
        continue;
      const Object& o = *(copyToSort[i]);
      if (!(*f_[i])(o))
        return false;
    }
    return true;
  }

private:
  edm::InputTag src_;
  edm::EDGetTokenT<edm::View<Object> > srcToken_;
  std::vector<StringCutObjectSelector<Object>*> f_;
  StringObjectFunction<Object>* order_;
};

#endif