config_reference.hpp

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/*
 * config_reference.hpp
 *
 *  Created on: Feb 1, 2016
 *      Author: Leonidas Georgopoulos
 */
 
#ifndef DBE_CONFIG_REFERENCE_HPP_
#define DBE_CONFIG_REFERENCE_HPP_
 
#include "dbe/Exceptions.hpp"
#include "dbe/config_object_key.hpp"
 
#include "conffwk/ConfigObject.hpp"
 
#include <vector>
#include <memory>
 
#ifndef DONOT_THROW_ON_NULL_CONFIGOBJECT_REFERENCE
#define DEBUG_THROW_ON_NULL_CONFIGOBJECT_REFERENCE \
    if(check_null and rval.is_deleted()) \
    throw daq::dbe::null_config_reference_access(ERS_HERE);
#else
#define DEBUG_THROW_ON_NULL_CONFIGOBJECT_REFERENCE
#endif
 
namespace dbe
{
namespace inner
{
class dbcontroller;
 
namespace configobject
{
 
//------------------------------------------------------------------------------------------
class oref;
 
class wref
{
        dunedaq::conffwk::ConfigObject ref;
        wref(dunedaq::conffwk::ConfigObject const & o)
                : ref(o)
        {
        }
 
        wref(wref const &) = delete;
        wref operator=(wref const &) = delete;
 
        friend class oref;
};
//------------------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------------------
struct refhasher;
 
class tref;
class vref;
template<typename > class gref;
template<typename > class aref;
class oref
{
        friend class tref;
        friend class vref;
        friend struct refhasher;
        template<typename > friend class aref;
        template<typename > friend class gref;
        friend class dbe::inner::dbcontroller;
        friend bool operator ==(dbe::cokey const & left, dbe::cokey const & right);
 
        wref ref;
        std::string this_last_full_name;
 
        oref(dunedaq::conffwk::ConfigObject const & o) noexcept(true)
                : ref
                    { o },
                    this_last_full_name(o.full_name())
        {
        }
 
        std::string full_name() const
        {
            return this_last_full_name;
        }
 
        void rename(std::string const & newname)
        {
            ref.ref.rename(newname);
            this_last_full_name = newname;
        }
 
        explicit operator dunedaq::conffwk::ConfigObject&() noexcept
        {
            return ref.ref;
        }
 
        explicit operator dunedaq::conffwk::ConfigObject const &() const noexcept
        {
            return ref.ref;
        }
 
        // non-copyable
        oref(oref const &) = delete;
        oref operator=(oref const &) = delete;
 
    public:
        operator dbe::cokey() const
        {
            return
            {   ref.ref.UID(),ref.ref.class_name()};
        }
};
//------------------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------------------
template<typename T> class ref_interface;
 
template<typename T, typename U> class authorized_getter
{
    private:
        ref_interface<T> const * that;
 
    public:
        authorized_getter(ref_interface<T> const * caller)
                : that(caller)
        {
        }
 
        U operator()(std::string const & key);
};
 
template<typename T> class ref_interface
{
    private:
        explicit operator dunedaq::conffwk::ConfigObject &() noexcept
        {
            return static_cast<T*>(this)->ref();
        }
 
        explicit operator dunedaq::conffwk::ConfigObject &() const noexcept
        {
            return static_cast<T const *>(this)->ref();
        }
 
    protected:
        template<typename U> U getdirect(std::string const & key) const
        {
            U value;
            try
            {
                static_cast<dunedaq::conffwk::ConfigObject &>(*const_cast<ref_interface<T>*>(this)).get(key, value);
            }
            catch (dunedaq::conffwk::Exception const & e)
            {
                // TODO handle retrieval errors here
            }
            return value;
        }
 
        template<typename X, typename U> friend class authorized_getter;
 
    public:
 
        bool is_null() const
        {
            return static_cast<dunedaq::conffwk::ConfigObject &>(static_cast<T const *>(this)->ref(false)).is_deleted();
        }
 
        std::string UID() const
        {
            return static_cast<dunedaq::conffwk::ConfigObject &>(*this).UID();
        }
 
        std::string class_name() const
        {
            return static_cast<dunedaq::conffwk::ConfigObject &>(*this).class_name();
        }
 
        std::string full_name() const
        {
            return static_cast<dunedaq::conffwk::ConfigObject &>(*this).full_name();
        }
 
        std::string contained_in() const
        {
            return static_cast<dunedaq::conffwk::ConfigObject &>(*this).contained_in();
        }
 
        template<typename U> U get(std::string const & key)
        {
            authorized_getter<T, U> guard(this);
            return guard(key);
        }
 
        template<typename U> void get(std::string const & key, U & val)
        {
            val = get<U>(key);
        }
 
        std::vector<T> referenced_by(std::string const & name = "*", bool check_composite_only =
                true) const;
 
        void set_obj_null(std::string const & name, bool is_simple, bool skip_non_null_check = false)
        {
            if(is_simple)
            {
              static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_obj(name, nullptr, skip_non_null_check);
            } else
            {
              static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_objs(name, {}, skip_non_null_check);
            }
        }
 
        void set_obj(std::string const & name, T const & other,
                                    bool skip_non_null_check = false)
        {
    static_cast<dunedaq::conffwk::ConfigObject &> ( *this ).set_obj ( name,
                                                    &static_cast<dunedaq::conffwk::ConfigObject &> ( other ),
                                                                                                    skip_non_null_check);
        }
 
        void set_objs(std::string const & name, std::vector<T> const & others,
                                    bool skip_non_null_check = false)
        {
            std::vector<dunedaq::conffwk::ConfigObject const *> configobjects;
 
            std::transform(std::begin(others), std::end(others),
                                            std::back_inserter(configobjects), [](T const & aref )
    {
      return &static_cast<dunedaq::conffwk::ConfigObject const &> ( aref );
    } );
 
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_objs(name, configobjects, skip_non_null_check);
        }
 
        template<typename U> void set_by_val(std::string const & name, U val)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_by_val(name, val);
        }
 
        template<typename U> void set_by_ref(std::string const & name, U & val)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_by_ref(name, val);
        }
 
        void set_enum(std::string const & name, std::string const & val)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_enum(name, val);
        }
 
        void set_class(std::string const & name, std::string const & val)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_class(name, val);
        }
 
        void set_date(std::string const & name, std::string const & val)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_date(name, val);
        }
 
        void set_time(std::string const & name, std::string const & val)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_time(name, val);
        }
 
        void set_enum(std::string const & name, const std::vector<std::string>& value)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_enum(name, value);
        }
 
        void set_class(std::string const & name, const std::vector<std::string>& value)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_class(name, value);
        }
 
        void set_date(std::string const & name, const std::vector<std::string>& value)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_date(name, value);
        }
 
        void set_time(std::string const & name, const std::vector<std::string>& value)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).set_time(name, value);
        }
 
        void move(std::string const & at)
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).move(at);
        }
 
        void print_ref(std::ostream& s, 
                   dunedaq::conffwk::Configuration &
                   conf, 
                                        const std::string& prefix = "", 
                                        bool show_contained_in = false 
                                        ) const
        {
            static_cast<dunedaq::conffwk::ConfigObject &>(*this).print_ref(s, conf, prefix, show_contained_in);
        }
 
        friend std::ostream & operator<<(std::ostream & os,
                                                                            dbe::inner::configobject::tref const & atref);
 
        friend class dbe::inner::configobject::tref;
        friend class dbe::inner::configobject::vref;
        friend class dbe::inner::configobject::aref<T>;
};
//------------------------------------------------------------------------------------------
 
template<typename T> class authorized_getter<T, configobject::tref>
{
    private:
        ref_interface<T> const * that;
 
    public:
        authorized_getter(ref_interface<T> const * caller)
                : that(caller)
        {
        }
 
        configobject::tref operator()(std::string const & key);
 
};
 
template<typename T> class authorized_getter<T, std::vector<configobject::tref>>
{
    private:
        ref_interface<T> const * that;
 
    public:
        authorized_getter(ref_interface<T> const * caller)
                : that(caller)
        {
        }
 
        std::vector<configobject::tref> operator()(std::string const & key);
 
};
 
template<typename T> class authorized_getter<T, dunedaq::conffwk::ConfigObject>
{
    private:
        ref_interface<T> const * that;
 
    public:
        authorized_getter(ref_interface<T> const * caller)
                : that(caller)
        {
        }
 
        dunedaq::conffwk::ConfigObject operator()(std::string const & key) = delete;
 
};
 
template<typename T> class authorized_getter<T, std::vector<dunedaq::conffwk::ConfigObject>>
{
    private:
        ref_interface<T> const * that;
 
    public:
        authorized_getter(ref_interface<T> const * caller)
                : that(caller)
        {
        }
 
        std::vector<dunedaq::conffwk::ConfigObject> operator()(std::string const & key) = delete;
 
};
 
template<typename T, typename U> U authorized_getter<T, U>::operator()(
        std::string const & key)
{
    return this->that->template getdirect<U>(key);
}
 
//------------------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------------------
struct refhasher
{
        size_t operator()(dbe::cokey const & o) const
        {
            return std::hash<std::string>()(o.this_class + o.this_name);
        }
};
//------------------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------------------
class tref:
                        public ref_interface<tref>
{
    private:
        std::shared_ptr<oref> refered;
 
        dunedaq::conffwk::ConfigObject & ref(bool check_null = true) const
        {
            dunedaq::conffwk::ConfigObject & rval = static_cast<dunedaq::conffwk::ConfigObject &>(*refered.get());
            DEBUG_THROW_ON_NULL_CONFIGOBJECT_REFERENCE
            return rval;
        }
 
        tref(std::shared_ptr<oref> other)
                : refered(other)
        {
        }
 
        friend class ref_interface<tref> ;
        friend class dbe::inner::dbcontroller;
};
//------------------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------------------
class vref:
                        public ref_interface<vref>
{
    private:
        std::weak_ptr<oref> refered;
 
        dunedaq::conffwk::ConfigObject & ref(bool check_null = false) const
        {
            std::shared_ptr<oref> return_val =
                    refered.expired() ?
                            std::shared_ptr<oref>(new oref(dunedaq::conffwk::ConfigObject())) : refered.lock();
            dunedaq::conffwk::ConfigObject & rval = static_cast<dunedaq::conffwk::ConfigObject &>(*return_val);
            DEBUG_THROW_ON_NULL_CONFIGOBJECT_REFERENCE
            return rval;
        }
 
        vref(std::weak_ptr<oref> other)
                : refered(other)
        {
        }
 
        friend class ref_interface<vref> ;
        friend class dbe::inner::dbcontroller;
};
//------------------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------------------
template<typename T> inline std::ostream & operator<<(std::ostream & os,
                                                                                                            ref_interface<T> const & atref)
{
    return os << static_cast<T const &>(atref).ref();
}
//------------------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------------------
template<typename T>
inline bool operator==(ref_interface<T> const & l,
                                                ref_interface<T> const & r)
{
    return l.UID() == r.UID() and l.class_name() == r.class_name();
}
//------------------------------------------------------------------------------------------
 
}
}
}
 
#endif /* DBE_CONFIG_REFERENCE_HPP_ */