/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/RecoTauTag/RecoTau/interface/TauDiscriminationProducerBase.h

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#ifndef RecoTauTag_RecoTau_TauDiscriminationProducerBase_H_
#define RecoTauTag_RecoTau_TauDiscriminationProducerBase_H_

/* class TauDiscriminationProducerBase
 *
 * Base classes for producing Calo and PFTau discriminators
 *
 * PFTaus   - inherit from PFTauDiscriminationProducerBase
 * CaloTaus - inherit from CaloTauDiscriminationProducerBase
 *
 * The base class takes a (Calo/PF)Tau collection and a collection of
 * associated (Calo/PF)TauDiscriminators.  Each tau is required to pass the given
 * set of prediscriminants.  Taus that pass these are then passed to the
 * pure virtual function
 *
 *      double discriminate(const TauRef&);
 *
 * The derived classes should implement this function and return a double
 * giving the specific discriminant result for this tau.
 *
 * The edm::Event and EventSetup are available to the derived classes
 * at the beginning of the event w/ the virtual function
 *
 *      void beginEvent(...)
 *
 * The derived classes can set the desired value for taus that fail the
 * prediscriminants by setting the protected variable prediscriminantFailValue_
 *
 * created :  Wed Aug 12 16:58:37 PDT 2009
 * Authors :  Evan Friis (UC Davis), Simone Gennai (SNS)
 */

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

#include "DataFormats/TauReco/interface/PFTau.h"
#include "DataFormats/TauReco/interface/PFTauDiscriminator.h"

#include "DataFormats/TauReco/interface/CaloTau.h"
#include "DataFormats/TauReco/interface/CaloTauDiscriminator.h"

template<class TauType, class TauDiscriminator>
class TauDiscriminationProducerBase : public edm::EDProducer {
  public:
    // setup framework types for this tautype
    typedef std::vector<TauType>        TauCollection;
    typedef edm::Ref<TauCollection>     TauRef;
    typedef edm::RefProd<TauCollection> TauRefProd;

    // standard constructor from PSet
    explicit TauDiscriminationProducerBase(const edm::ParameterSet& iConfig);

    // default constructor must not be called - it will throw an exception
    // derived!  classes must call the parameterset constructor.
    TauDiscriminationProducerBase();

    virtual ~TauDiscriminationProducerBase(){}

    void produce(edm::Event&, const edm::EventSetup&);

    // called at the beginning of every event - override if necessary.
    virtual void beginEvent(const edm::Event& evt,
                            const edm::EventSetup& evtSetup) {}

    // abstract functions implemented in derived classes.
    virtual double discriminate(const TauRef& tau) = 0;

    // called at the end of event processing - override if necessary.
    virtual void endEvent(edm::Event& evt) {}

    struct TauDiscInfo {
      edm::InputTag label;
      edm::Handle<TauDiscriminator> handle;
      double cut;
      void fill(const edm::Event& evt) { evt.getByLabel(label, handle); };
    };

  protected:
    //value given to taus that fail prediscriminants
    double prediscriminantFailValue_;

    edm::InputTag TauProducer_;

    std::string moduleLabel_;

  private:
    std::vector<TauDiscInfo> prediscriminants_;
    // select boolean operation on prediscriminants (and = 0x01, or = 0x00)
    uint8_t andPrediscriminants_;
};

// define our implementations
typedef TauDiscriminationProducerBase<reco::PFTau, reco::PFTauDiscriminator>
  PFTauDiscriminationProducerBase;
typedef TauDiscriminationProducerBase<reco::CaloTau, reco::CaloTauDiscriminator>
  CaloTauDiscriminationProducerBase;

//for this tau type
template<class TauType> std::string getProducerString()
{
  // this generic one shoudl never be called.
  // these are specialized in TauDiscriminationProducerBase.cc
  throw cms::Exception("TauDiscriminationProducerBase")
      << "Unsupported TauType used.  You must use either PFTau or CaloTaus.";
}
#endif