structDescription.hpp

Go to the documentation of this file.

/************************************************************************
Copyright (C) 2011 - 2014 Project Wolframe.
All rights reserved.

This file is part of Project Wolframe.

Commercial Usage
Licensees holding valid Project Wolframe Commercial licenses may
use this file in accordance with the Project Wolframe
Commercial License Agreement provided with the Software or,
alternatively, in accordance with the terms contained
in a written agreement between the licensee and Project Wolframe.

GNU General Public License Usage
Alternatively, you can redistribute this file and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Wolframe is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Wolframe. If not, see <http://www.gnu.org/licenses/>.

If you have questions regarding the use of this file, please contact
Project Wolframe.

************************************************************************/
#ifndef _Wolframe_SERIALIZE_STRUCT_DESCRIPTION_HPP_INCLUDED
#define _Wolframe_SERIALIZE_STRUCT_DESCRIPTION_HPP_INCLUDED
#include "serialize/struct/structDescriptionBase.hpp"
#include "serialize/struct/traits_getCategory.hpp"
#include "serialize/struct/intrusiveParser.hpp"
#include "serialize/struct/intrusiveSerializer.hpp"
#include "serialize/struct/intrusiveProperty.hpp"
#include <exception>
#include <stdexcept>
#include <sstream>

namespace _Wolframe {
namespace serialize {

template <class Structure>
struct StructDescription :public StructDescriptionBase
{
        StructDescription()
                :StructDescriptionBase( &constructor, &destructor, getTypename<Structure>(), 0, sizeof(Structure), IntrusiveProperty<Structure>::type(), &IntrusiveParser<Structure>::parse, &IntrusiveSerializer<Structure>::fetch, NoRequirement){}

        template <typename Element>
        StructDescription& operator()( const char* tag, Element Structure::*eptr)
        {
                StructDescriptionBase::Parse parse_ = &IntrusiveParser<Element>::parse;
                StructDescriptionBase::Fetch fetch_ = &IntrusiveSerializer<Element>::fetch;
                StructDescriptionBase::ElementType type_ = IntrusiveProperty<Element>::type();
                std::size_t pp = (std::size_t)&(((Structure*)0)->*eptr);

                StructDescriptionBase e( getTypename<Element>(), pp, sizeof(Element), type_, parse_, fetch_, NoRequirement);
                if (find( tag) != end())
                {
                        std::ostringstream err;
                        err << "duplicate definition of " << tag << " in structure";
                        throw std::runtime_error( err.str().c_str());
                }
                define( tag, e);
                return *this;
        }

        StructDescription& mandatory()
        {
                if (last().optional()) throw std::logic_error( "ambiguous mandatory/optional declaration");
                last().requirement( Mandatory);
                return *this;
        }

        StructDescription& optional()
        {
                if (last().mandatory()) throw std::logic_error( "ambiguous mandatory/optional declaration");
                last().requirement( Optional);
                return *this;
        }

        StructDescription& operator--(int)
        {
                defineEndOfAttributes();
                return *this;
        }

        static bool constructor( void* obj)
        {
                struct StructureShell :public Structure
                {
                        void* operator new( std::size_t num_bytes, void* obj) throw (std::bad_alloc)
                        {
                                if (sizeof(StructureShell) != num_bytes) throw std::bad_alloc();
                                return obj;
                        }
                };
                try
                {
                        new (obj) StructureShell();
                        return true;
                }
                catch (const std::exception&)
                {
                        return false;
                }
        }

        static void destructor( void* obj)
        {
                ((Structure*)obj)->~Structure();
        }

        template <class Element>
        static const char* getTypename()
        {
                const char* typ = 0;
                try
                {
                        typ = typeid(Element).name();
                }
                catch (std::bad_typeid)
                {}
                return typ;
        }
};

}}// end namespace
#endif