/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/RecoTauTag/TauTagTools/plugins/PFTauViewRefSelector.cc

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/* \class CandViewRefSelector
 *
 * PFTau Selector based on a configurable cut.
 * Reads a edm::View<PFTau> as input
 * and saves a vector of references
 * Usage:
 *
 * module selectedCands = PFTauViewRefSelector {
 *   InputTag src = myCollection
 *   string cut = "pt > 15.0"
 * };
 *
 * \author: Luca Lista, INFN
 * \modifications: Evan Friis, UC Davis
 *
 */

#include <boost/foreach.hpp>

#include "FWCore/Framework/interface/MakerMacros.h"
#include "CommonTools/UtilAlgos/interface/StringCutObjectSelector.h"

#include "DataFormats/TauReco/interface/PFTauFwd.h"
#include "RecoTauTag/RecoTau/interface/RecoTauCommonUtilities.h"

#include "FWCore/Framework/interface/EDFilter.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"

class PFTauViewRefSelector : public edm::EDFilter {
  public:
    explicit PFTauViewRefSelector(const edm::ParameterSet &pset);
    ~PFTauViewRefSelector() {}
    bool filter(edm::Event& evt, const edm::EventSetup& es);
  private:
    edm::InputTag src_;
    std::string cut_;
    std::auto_ptr<StringCutObjectSelector<reco::PFTau> > outputSelector_;
    bool filter_;
};

PFTauViewRefSelector::PFTauViewRefSelector(const edm::ParameterSet &pset) {
  src_ = pset.getParameter<edm::InputTag>("src");
  std::string cut = pset.getParameter<std::string>("cut");
  filter_ = pset.exists("filter") ? pset.getParameter<bool>("filter") : false;
  outputSelector_.reset(new StringCutObjectSelector<reco::PFTau>(cut));
  produces<reco::PFTauRefVector>();
}

bool
PFTauViewRefSelector::filter(edm::Event& evt, const edm::EventSetup& es) {
  std::auto_ptr<reco::PFTauRefVector> output(new reco::PFTauRefVector());
  // Get the input collection to clean
  edm::Handle<reco::CandidateView> input;
  evt.getByLabel(src_, input);
  // Cast the input candidates to Refs to real taus
  reco::PFTauRefVector inputRefs =
      reco::tau::castView<reco::PFTauRefVector>(input);

  BOOST_FOREACH(const reco::PFTauRef &tau, inputRefs) {
    if (outputSelector_.get() && (*outputSelector_)(*tau)) {
      output->push_back(tau);
    }
  }
  size_t outputSize = output->size();
  evt.put(output);
  // Filter if desired and no objects passed our cut
  return !(filter_ && outputSize == 0);
}

DEFINE_FWK_MODULE(PFTauViewRefSelector);

#include "CommonTools/UtilAlgos/interface/SingleObjectSelector.h"
#include "DataFormats/JetReco/interface/PFJet.h"
typedef SingleObjectSelector<
          edm::View<reco::Jet>,
          StringCutObjectSelector<reco::Jet, true>
       > JetViewRefSelector;

DEFINE_FWK_MODULE(JetViewRefSelector);