/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/PhysicsTools/PatUtils/interface/StringParserTools.h

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#ifndef PhysicsTools_PatUtils_interface_StringParserTools_h
#define PhysicsTools_PatUtils_interface_StringParserTools_h

#include <boost/shared_ptr.hpp>
#include "CommonTools/Utils/interface/StringObjectFunction.h"
#include "CommonTools/Utils/interface/StringCutObjectSelector.h"

#include "DataFormats/PatCandidates/interface/Electron.h"
#include "DataFormats/PatCandidates/interface/Muon.h"
#include "DataFormats/PatCandidates/interface/Tau.h"
#include "DataFormats/PatCandidates/interface/Photon.h"
#include "DataFormats/PatCandidates/interface/Jet.h"
#include "DataFormats/PatCandidates/interface/MET.h"
#include "DataFormats/PatCandidates/interface/GenericParticle.h"
#include "DataFormats/PatCandidates/interface/PFParticle.h"

class PATStringObjectFunction {

public:
    PATStringObjectFunction() {}
    PATStringObjectFunction(const std::string &string) ;

    double operator()(const reco::Candidate &c) const ;

private:
    std::string expr_;
    boost::shared_ptr<StringObjectFunction<reco::Candidate> > candFunc_; 

    boost::shared_ptr<StringObjectFunction<pat::Electron> >         eleFunc_;
    boost::shared_ptr<StringObjectFunction<pat::Muon> >              muFunc_;
    boost::shared_ptr<StringObjectFunction<pat::Tau> >              tauFunc_;
    boost::shared_ptr<StringObjectFunction<pat::Photon> >           gamFunc_;
    boost::shared_ptr<StringObjectFunction<pat::Jet> >              jetFunc_;
    boost::shared_ptr<StringObjectFunction<pat::MET> >              metFunc_;
    boost::shared_ptr<StringObjectFunction<pat::GenericParticle> >   gpFunc_;
    boost::shared_ptr<StringObjectFunction<pat::PFParticle> >        pfFunc_;

    template<typename Obj> 
    boost::shared_ptr<StringObjectFunction<Obj> > tryGet(const std::string &str) {
        try {
            return boost::shared_ptr<StringObjectFunction<Obj> >(new StringObjectFunction<Obj>(str));
        } catch (cms::Exception) { 
            return boost::shared_ptr<StringObjectFunction<Obj> >();
        }
    }

    template<typename Obj>
    double
    tryEval(const reco::Candidate &c, const boost::shared_ptr<StringObjectFunction<Obj> > &func) const {
        if (func.get()) return (*func)(static_cast<const Obj &>(c));
        else throwBadType(typeid(c));
        assert(false);
        return 0; 
    }

    // out of line throw exception
    void throwBadType(const std::type_info &ty1) const ;
    
};

class PATStringCutObjectSelector {

public:
    PATStringCutObjectSelector() {}
    PATStringCutObjectSelector(const std::string &string) ;

    bool operator()(const reco::Candidate &c) const ;

private:
    std::string expr_;
    boost::shared_ptr<StringCutObjectSelector<reco::Candidate> > candFunc_; 

    boost::shared_ptr<StringCutObjectSelector<pat::Electron> >         eleFunc_;
    boost::shared_ptr<StringCutObjectSelector<pat::Muon> >              muFunc_;
    boost::shared_ptr<StringCutObjectSelector<pat::Tau> >              tauFunc_;
    boost::shared_ptr<StringCutObjectSelector<pat::Photon> >           gamFunc_;
    boost::shared_ptr<StringCutObjectSelector<pat::Jet> >              jetFunc_;
    boost::shared_ptr<StringCutObjectSelector<pat::MET> >              metFunc_;
    boost::shared_ptr<StringCutObjectSelector<pat::GenericParticle> >   gpFunc_;
    boost::shared_ptr<StringCutObjectSelector<pat::PFParticle> >        pfFunc_;

    template<typename Obj> 
    boost::shared_ptr<StringCutObjectSelector<Obj> > tryGet(const std::string &str) {
        try {
            return boost::shared_ptr<StringCutObjectSelector<Obj> >(new StringCutObjectSelector<Obj>(str));
        } catch (cms::Exception) { 
            return boost::shared_ptr<StringCutObjectSelector<Obj> >();
        }
    }

    template<typename Obj>
    bool
    tryEval(const reco::Candidate &c, const boost::shared_ptr<StringCutObjectSelector<Obj> > &func) const {
        if (func.get()) return (*func)(static_cast<const Obj &>(c));
        else throwBadType(typeid(c));
        assert(false);
        return false;
    }

    // out of line throw exception
    void throwBadType(const std::type_info &ty1) const ;

    
    
};


#endif