TriggerOutputBranches.h

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#ifndef PhysicsTools_NanoAOD_TriggerOutputBranches_h
#define PhysicsTools_NanoAOD_TriggerOutputBranches_h

#include <string>
#include <vector>
#include <TTree.h>
#include "FWCore/Framework/interface/EventForOutput.h"
#include "DataFormats/Common/interface/TriggerResults.h"
#include "FWCore/Common/interface/TriggerNames.h"
#include "DataFormats/Provenance/interface/BranchDescription.h"
#include "FWCore/Utilities/interface/EDGetToken.h"

class TriggerOutputBranches {
 public:
    TriggerOutputBranches(const edm::BranchDescription *desc, const edm::EDGetToken & token ) :
        m_token(token), m_lastRun(-1),m_fills(0)
    {
        if (desc->className() != "edm::TriggerResults") throw cms::Exception("Configuration", "NanoAODOutputModule/TriggerOutputBranches can only write out edm::TriggerResults objects");
    }

    void updateTriggerNames(TTree &tree,const edm::TriggerNames & names, const edm::TriggerResults & ta);
    void fill(const edm::EventForOutput &iEvent,TTree & tree) ;

 private:
    edm::TriggerNames triggerNames(const edm::TriggerResults triggerResults); //FIXME: if we have to keep it local we may use PsetID check per event instead of run boundary

    edm::EDGetToken m_token;
    std::string  m_baseName;
    bool         m_singleton;
    UInt_t       m_counter;
    struct NamedBranchPtr {
        std::string name, title;
    int idx;
        TBranch * branch;
    uint8_t buffer;
        NamedBranchPtr(const std::string & aname, const std::string & atitle, TBranch *branchptr = nullptr) : 
            name(aname), title(atitle), branch(branchptr), buffer(-1) {}
    };
    std::vector<NamedBranchPtr> m_triggerBranches;
    long m_lastRun;
    unsigned long m_fills;

    template<typename T>
    void fillColumn(NamedBranchPtr & nb, const edm::TriggerResults & triggers) {
    if(nb.idx>=0) nb.buffer=triggers.accept(nb.idx);
    nb.branch->SetAddress(&(nb.buffer)); // Can be improved: this is not reallt needed at each event
                             //but we should be sure that resize of vectors of TriggerOutputBranches do not mess up things
    }

};

#endif