printValue.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_PRINT_VALUE_HPP_INCLUDED
#define _Wolframe_SERIALIZE_STRUCT_PRINT_VALUE_HPP_INCLUDED
#include "types/datetime.hpp"
#include "types/bignumber.hpp"
#include <boost/numeric/conversion/cast.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits.hpp>
#include <string>

namespace {
struct PrintValueType
{
        struct String {};               
        struct Bool {};                 
        struct Double {};               
        struct UInt {};                 
        struct Int {};                  
        struct DateTime {};             
        struct BigNumber {};            

        template <typename T>
        static typename boost::enable_if_c<
                boost::is_same<T,std::string>::value
                ,const String&>::type get( const T&) { static String rt; return rt;}

        template <typename T>
        static typename boost::enable_if_c<
                boost::is_same<T,bool>::value
                ,const Bool&>::type get( const T&) { static Bool rt; return rt;}

        template <typename T>
        static typename boost::enable_if_c<
                boost::is_floating_point<T>::value
                ,const Double&>::type get( const T&) { static Double rt; return rt;}

        template <typename T>
        static typename boost::enable_if_c<
                boost::is_arithmetic<T>::value && boost::is_signed<T>::value && !boost::is_floating_point<T>::value && !boost::is_same<T,bool>::value
                ,const Int&>::type get( const T&) { static Int rt; return rt;}

        template <typename T>
        static typename boost::enable_if_c<
                boost::is_arithmetic<T>::value && boost::is_unsigned<T>::value && !boost::is_floating_point<T>::value && !boost::is_same<T,bool>::value
                ,const UInt&>::type get( const T&) { static UInt rt; return rt;}

        template <typename T>
        static typename boost::enable_if_c<
                boost::is_same<T,_Wolframe::types::DateTime>::value
                ,const DateTime&>::type get( const T&) { static DateTime rt; return rt;}

        template <typename T>
        static typename boost::enable_if_c<
                boost::is_same<T,_Wolframe::types::BigNumber>::value
                ,const BigNumber&>::type get( const T&) { static BigNumber rt; return rt;}
};



template <typename ValueType>
bool printValue_( const ValueType& val, const PrintValueType::Bool&, _Wolframe::types::VariantConst& element)
{
        element = val;
        return true;
}

template <typename ValueType>
bool printValue_( const ValueType& val, const PrintValueType::String&, _Wolframe::types::VariantConst& element)
{
        element.init( val.c_str(), val.size());
        return true;
}

template <typename ValueType>
bool printValue_( const ValueType& val, const PrintValueType::Double&, _Wolframe::types::VariantConst& element)
{
        try
        {
                element = boost::numeric_cast<double>( val);
                return true;
        }
        catch (boost::bad_numeric_cast&){}
        return false;
}

template <typename ValueType>
bool printValue_( const ValueType& val, const PrintValueType::Int&, _Wolframe::types::VariantConst& element)
{
        try
        {
                element = boost::numeric_cast<int>( val);
                return true;
        }
        catch (boost::bad_numeric_cast&){}
        return false;
}


template <typename ValueType>
bool printValue_( const ValueType& val, const PrintValueType::UInt&, _Wolframe::types::VariantConst& element)
{
        try
        {
                element = boost::numeric_cast<unsigned int>( val);
                return true;
        }
        catch (boost::bad_numeric_cast&){}
        return false;
}

template <typename ValueType>
bool printValue_( const ValueType& val, const PrintValueType::DateTime&, _Wolframe::types::VariantConst& element)
{
        element = val;
        return true;
}

template <typename ValueType>
bool printValue_( const ValueType& val, const PrintValueType::BigNumber&, _Wolframe::types::VariantConst& element)
{
        element = val;
        return true;
}

} //anonymous namespace
namespace _Wolframe {
namespace serialize {

template <typename ValueType>
bool printValue( const ValueType& val, types::VariantConst& element)
{
        return printValue_( val, PrintValueType::get(val), element);
}

}}//namespace
#endif