/data/refman/pasoursint/CMSSW_5_2_9/src/PhysicsTools/PatAlgos/interface/PATUserDataMerger.h

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//
// $Id: PATUserDataMerger.h,v 1.10 2011/10/26 17:01:25 vadler Exp $
//

#ifndef PhysicsTools_PatAlgos_PATUserDataMerger_h
#define PhysicsTools_PatAlgos_PATUserDataMerger_h

#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.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);
    ~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_;   // ValueMap containing the user data
    Operation                   loader_;

  };

}

// Constructor: Initilize user data src
template<typename ObjectType, typename Operation>
pat::PATUserDataMerger<ObjectType, Operation>::PATUserDataMerger(const edm::ParameterSet & iConfig) :
  userDataSrc_(iConfig.getParameter<std::vector<edm::InputTag> >("src") )
{
}


/* ==================================================================================
     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 )
{

  std::vector<edm::InputTag>::const_iterator input_it = userDataSrc_.begin(),
//     input_begin = userDataSrc_.begin(), // warning from gcc461: variable 'input_begin' set but not used [-Wunused-but-set-variable]
    input_end = userDataSrc_.end();

  for ( ; input_it != input_end; ++input_it ) {

    // 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 ( input_it->encode().size() == 0 ) continue;
    iEvent.getByLabel( *input_it, userData );

    edm::Ptr<reco::Candidate> recoObject = patObject.originalObjectRef();
    if ( userData->contains( recoObject.id() ) ) {
      loader_.addData( patObject, input_it->encode(), (*userData)[recoObject]);
    }

  }

}

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

#endif