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ContextProvider.hpp

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#ifndef WNS_PROBE_BUS_CONTEXTPROVIDER_HPP
#define WNS_PROBE_BUS_CONTEXTPROVIDER_HPP

#include <WNS/probe/bus/Context.hpp>

#include <WNS/StaticFactory.hpp>
#include <WNS/PyConfigViewCreator.hpp>

#include <WNS/osi/PDU.hpp>
#include <boost/function.hpp>

namespace wns { namespace probe { namespace bus {

    class IContextProvider
    {
    public:
        virtual void
        visit(IContext&) const = 0;

        virtual void
        visit(IContext&, const wns::osi::PDUPtr&) const = 0;

        virtual ~IContextProvider() {}
    };

    template<typename T>
    class PDUContextProvider:
        public IContextProvider
    {
    public:

        virtual void
        visit(IContext&) const{return;};

        virtual void
        visit(IContext& c, const wns::osi::PDUPtr& pdu) const
        {
            // Check if not NULL, return else
            if (!pdu) return;

            // Check if of type T, return else
            if (NULL == dynamic_cast<T*>(pdu.getPtr())) return;

            // Do the cast and dispatch
            const SmartPtr<T>& compound = wns::dynamicCast<T>(pdu);
            this->doVisit(c, compound);
        };

    private:
        virtual void
        doVisit(IContext&, const SmartPtr<T>&) const = 0;
    };

    class ContextProvider:
        public IContextProvider
    {
    public:
        virtual void
        visit(IContext& c) const
        {
            this->doVisit(c);
        };

        virtual void
        visit(IContext& c, const wns::osi::PDUPtr&) const
        {
            this->doVisit(c);
        };

    private:
        virtual void
        doVisit(IContext&) const = 0;
    };


    typedef PyConfigViewCreator<IContextProvider> ContextProviderCreator;
    typedef wns::StaticFactory<ContextProviderCreator> ContextProviderFactory;

    namespace contextprovider {

        class Constant :
            public ContextProvider
        {
        public:
            Constant(const std::string& key, int value_);

            explicit
            Constant(const pyconfig::View& config);

        protected:
            const std::string key_;
            const int value_;

        private:
            virtual void
            doVisit(IContext&) const;
        };

        class Variable :
            public ContextProvider
        {
            // prohibit use of copy constructor
            Variable(const Variable&) : ContextProvider(), key_(), value_() {}
            std::string key_;
            int value_;
        public:
            Variable(const std::string& key, int value_);

            virtual void
            set(int value_);

            virtual int
            get() const;
        private:
            virtual void
            doVisit(IContext&) const;

        };

        class Container :
            public IContextProvider
        {
            IContextProvider* provider;
        public:
            Container(IContextProvider* p) : provider(p) {}

            virtual void
            visit(IContext& context) const
                {
                    provider->visit(context);
                }

            virtual void
            visit(IContext& context, const wns::osi::PDUPtr& pdu) const
                {
                    provider->visit(context, pdu);
                }

        };

        class Callback :
            public ContextProvider
        {
        public:
            Callback(const std::string& key,
                 boost::function0<int> callback):
                key_(key),
                callback_(callback)
            {}

        private:
            virtual void
            doVisit(IContext& c) const
                {
                    int value = callback_();
                    c.insertInt(key_, value);
                }

            std::string key_;
            boost::function0<int> callback_;

        };
    }

}}}


#endif // NOT defined WNS_PROBE_IDPROVIDER_HPP

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