CalibratableTest.h

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#ifndef CALIBRATABLETEST_H_
#define CALIBRATABLETEST_H_

// system include files
#include <memory>
#include <vector>
// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/one/EDAnalyzer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "CommonTools/UtilAlgos/interface/TFileService.h"

#include "DataFormats/ParticleFlowReco/interface/Calibratable.h"

#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFSimParticleFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrackFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecHitFwd.h"
#include "DataFormats/ParticleFlowReco/interface/PFClusterFwd.h"

#include <TTree.h>


class CalibratableTest : public edm::one::EDAnalyzer<> {
public:
    explicit CalibratableTest(const edm::ParameterSet&);
    ~CalibratableTest();

    /*
     * Returns the collection in the event matching the Handle.
     */
    template<class T> void getCollection(edm::Handle<T>& c,
            const edm::InputTag& tag, const edm::Event& event) const;

private:
    /* 
     * The usual EDAnalyzer methods
     */
    virtual void beginJob() override;
    virtual void analyze(const edm::Event&, const edm::EventSetup&) override;
    virtual void endJob() override;

    /*
     * Called for each particle in the event to fill the tree and
     * reset calib_.
     */
    virtual void fillTreeAndReset();

    /*
     * Finds the main pions generated by FastSim
     */
    std::vector<unsigned> findPrimarySimParticles(
            const std::vector<reco::PFSimParticle>& sims);

    /*
     * Finds PFCandidates within some deltaR of the supplied sim particle.
     */
    std::vector<unsigned> findCandidatesInDeltaR(const reco::PFSimParticle& pft,
            const std::vector<reco::PFCandidate>& cands, const double& deltaR);

    /*
     * Fills calib_ with PFCandidate information.
     */
    void extractCandidate(const reco::PFCandidate& cand);

    /*
     * Computes delta R between two objects.
     */
    double deltaR(const double& eta1, const double& eta2, const double& phi1,
            const double& phi2);

    //Calibratable tree
    TTree* tree_;

    //This analyzer produces a file with a tree so we need,
    edm::Service<TFileService> fileservice_;

    //Debug?
    int debug_;

    //True if this event was generally successful: 
    //if no sim particles are found, this will be false
    bool thisEventPasses_;
    //True if this particle should be written to the tree
    //If no PFCandidates are found within a delta R cone of the sim particle,
    //this will be false.
    bool thisParticlePasses_;

    //The Calibratable object
    pftools::Calibratable* calib_;

    //Increment nWrites_ for every record written to the tree
    //Incremement nFails_ for every event/particle not written to the tree (thisEventPasses_ == false)
    unsigned nParticleWrites_, nParticleFails_;
    unsigned nEventWrites_, nEventFails_;
    
    //Size of cone around sim particle to look for PFCandidates
    double deltaRCandToSim_;

    //Collection input tags
    edm::InputTag inputTagCandidates_;
    edm::InputTag inputTagSimParticles_;
    edm::InputTag inputTagClustersEcal_;
    edm::InputTag inputTagClustersHcal_;

    //collections
    edm::Handle<reco::PFCandidateCollection>* pfCandidates_;
    edm::Handle<reco::PFSimParticleCollection>* simParticles_;
    edm::Handle<reco::PFClusterCollection>* clustersEcal_;
    edm::Handle<reco::PFClusterCollection>* clustersHcal_;

};

template<class T> void CalibratableTest::getCollection(edm::Handle<T>& c,
        const edm::InputTag& tag, const edm::Event& event) const {

    try {
        event.getByLabel(tag, c);
        if(!c.isValid()) {
            std::cout << "Warning! Collection for label " << tag << " is not valid!" << std::endl;
        }
    }
    catch (cms::Exception& err) {
        std::cout << "Couldn't get collection\n";
        //std::ostringstream s;
        //LogError("Error getting collection!") << s;
    }
}

#endif /*CALIBRATABLETEST_H_*/