PATUserDataMerger.h

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//
//

#ifndef PhysicsTools_PatAlgos_PATUserDataMerger_h
#define PhysicsTools_PatAlgos_PATUserDataMerger_h

#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/ConsumesCollector.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/Utilities/interface/transform.h"
#include "DataFormats/Common/interface/View.h"
#include "DataFormats/Common/interface/Ptr.h"
#include "DataFormats/Common/interface/Association.h"
#include "DataFormats/Candidate/interface/CandidateFwd.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/PatCandidates/interface/PATObject.h"

#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"

#include <iostream>


namespace pat {
  namespace helper {
    struct AddUserInt {
        typedef int                       value_type;
        typedef edm::ValueMap<value_type> product_type;
        template<typename ObjectType>
        void addData(ObjectType &obj, const std::string & key, const value_type &val) { obj.addUserInt(key, val); }
    };
    struct AddUserFloat {
        typedef float                     value_type;
        typedef edm::ValueMap<value_type> product_type;
        template<typename ObjectType>
        void addData(ObjectType &obj, const std::string & key, const value_type &val) { obj.addUserFloat(key, val); }
    };
    struct AddUserPtr {
        typedef edm::Ptr<UserData>        value_type;
        typedef edm::ValueMap<value_type> product_type;
        template<typename ObjectType>
        void addData(ObjectType &obj, const std::string & key, const value_type &val) {
              obj.addUserDataFromPtr(key, val);
        }
    };
    struct AddUserCand {
        typedef reco::CandidatePtr        value_type;
        typedef edm::ValueMap<value_type> product_type;
        template<typename ObjectType>
        void addData(ObjectType &obj, const std::string & key, const value_type &val) { obj.addUserCand(key, val); }
    };

  }

  template<typename ObjectType, typename Operation>
  class PATUserDataMerger {

  public:

    PATUserDataMerger() {}
    PATUserDataMerger(const edm::ParameterSet & iConfig, edm::ConsumesCollector & iC);
    ~PATUserDataMerger() {}

    static void fillDescription(edm::ParameterSetDescription & iDesc);

    // Method to call from PATUserDataHelper to add information to the PATObject in question.
    void add(ObjectType & patObject,
         edm::Event const & iEvent, edm::EventSetup const & iSetup);

  private:

    // configurables
    std::vector<edm::InputTag> userDataSrc_;
    std::vector<edm::EDGetTokenT<typename Operation::product_type> > userDataSrcTokens_;
    Operation                   loader_;

  };

}

// Constructor: Initilize user data src
template<typename ObjectType, typename Operation>
pat::PATUserDataMerger<ObjectType, Operation>::PATUserDataMerger(const edm::ParameterSet & iConfig, edm::ConsumesCollector & iC) :
  userDataSrc_(iConfig.getParameter<std::vector<edm::InputTag> >("src"))
{
  for ( std::vector<edm::InputTag>::const_iterator input_it = userDataSrc_.begin(); input_it !=  userDataSrc_.end(); ++input_it ) {
    userDataSrcTokens_.push_back( iC.consumes< typename Operation::product_type >( *input_it ) );
  }
}


/* ==================================================================================
     PATUserDataMerger::add
            This expects four inputs:
            patObject:         ObjectType to add to

        from Event:
        userDataSrc:       The data to add, which is a ValueMap keyed by recoObject

        from Setup:
        none currently

        This will simply add the UserData *'s from the value map that are
        indexed by the reco objects, to the pat object's user data vector.
   ==================================================================================
*/

template<class ObjectType, typename Operation>
void
pat::PATUserDataMerger<ObjectType, Operation>::add(ObjectType & patObject,
                           edm::Event const & iEvent,
                           const edm::EventSetup& iSetup)
{

  typename std::vector<edm::EDGetTokenT<typename Operation::product_type> >::const_iterator token_begin = userDataSrcTokens_.begin(), token_it = userDataSrcTokens_.begin(), token_end = userDataSrcTokens_.end();

  for ( ; token_it != token_end; ++token_it ) {
    const std::string encoded( userDataSrc_.at(token_it - token_begin).encode() );

    // Declare the object handles:
    // ValueMap containing the values, or edm::Ptr's to the UserData that
    //   is associated to those PAT Objects
    edm::Handle<typename Operation::product_type> userData;

    // Get the objects by label
    if ( encoded.size() == 0 ) continue;
    iEvent.getByToken( *token_it, userData );

    edm::Ptr<reco::Candidate> recoObject = patObject.originalObjectRef();
    loader_.addData( patObject, encoded, (*userData)[recoObject]);

  }

}

template<class ObjectType, typename Operation>
void
pat::PATUserDataMerger<ObjectType, Operation>::fillDescription(edm::ParameterSetDescription & iDesc)
{
  iDesc.add<std::vector<edm::InputTag> >("src");
}

#endif