FFTJetObjectFactory.h

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#ifndef JetMETCorrections_FFTJetObjects_FFTJetObjectFactory_h
#define JetMETCorrections_FFTJetObjects_FFTJetObjectFactory_h

//
// Simple factory for objects which can be constructed from ParameterSet
//
#include <map>
#include <string>

#include "FWCore/ParameterSet/interface/ParameterSetfwd.h"
#include "FWCore/Utilities/interface/Exception.h"

template<class Base>
struct AbsFFTJetObjectFactory
{
    virtual ~AbsFFTJetObjectFactory() {}
    virtual Base* create(const edm::ParameterSet& ps) const = 0;
};

template<class Base, class Derived>
struct ConcreteFFTJetObjectFactory : public AbsFFTJetObjectFactory<Base>
{
    virtual ~ConcreteFFTJetObjectFactory() {}
    inline Derived* create(const edm::ParameterSet& ps) const
        {return new Derived(ps);}
};

template<class Base>
struct DefaultFFTJetObjectFactory :
    public std::map<std::string, AbsFFTJetObjectFactory<Base>*>
{
    typedef Base base_type;

    inline DefaultFFTJetObjectFactory()
        : std::map<std::string, AbsFFTJetObjectFactory<Base>*>() {}

    virtual ~DefaultFFTJetObjectFactory()
    {
        for (typename std::map<std::string, AbsFFTJetObjectFactory<Base>*>::
                 iterator it = this->begin(); it != this->end(); ++it)
            delete it->second;
    }

    inline Base* create(const std::string& derivedType,
                        const edm::ParameterSet& ps) const
    {
        typename std::map<std::string, AbsFFTJetObjectFactory<Base>*>::
            const_iterator it = this->find(derivedType);
        if (it == this->end())
            throw cms::Exception("KeyNotFound")
                << "Derived type \"" << derivedType
                << "\" is not registered with the factory\n";
        return it->second->create(ps);
    }

private:
    DefaultFFTJetObjectFactory(const DefaultFFTJetObjectFactory&);
    DefaultFFTJetObjectFactory& operator=(const DefaultFFTJetObjectFactory&);
};

//
// Singleton for the factory
//
template <class Factory>
class StaticFFTJetObjectFactory
{
public:
    typedef typename Factory::Base::base_type base_type;

    static const Factory& instance()
    {
        static Factory obj;
        return obj;
    }

    template <class T>
    static void registerType(const std::string& className)
    {
        Factory& rd = const_cast<Factory&>(instance());
        delete rd[className];
        rd[className] = new ConcreteFFTJetObjectFactory<base_type,T>();
    }

private:
    StaticFFTJetObjectFactory();
};

#endif // JetMETCorrections_FFTJetObjects_FFTJetObjectFactory_h