create_attribute.hpp

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//
// (c) Copyright 2013 DESY, Eugen Wintersberger <eugen.wintersberger@desy.de>
//
// This file is part of libpniio.
//
// libpniio is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// libpniio 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 libpniio.  If not, see <http://www.gnu.org/licenses/>.
// ===========================================================================
// Created on: Jul 4, 2013
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
#pragma once

#include <pni/core/types.hpp>
#include "../nxobject.hpp"

namespace pni{
namespace io{
namespace nx{

    //-------------------------------------------------------------------------
    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE,
             typename T,
             typename STYPE
            > 
    class create_attribute_visitor : public boost::static_visitor<
                                     nxobject<GTYPE,FTYPE,ATYPE,LTYPE>  
                                     >
    {
        private:
            pni::core::string _name;  
            STYPE _shape;             
            bool  _overwrite;         
        public:
            using result_type = nxobject<GTYPE,FTYPE,ATYPE,LTYPE>;
            using group_type = GTYPE;
            using field_type =  FTYPE;
            using attribute_type = ATYPE;
            using link_type = LTYPE;

            //-----------------------------------------------------------------
            create_attribute_visitor(const pni::core::string &n,
                                     const STYPE &s,bool o):
                _name(n),
                _shape(s),
                _overwrite(o)
            {}

            //-----------------------------------------------------------------
            result_type operator()(const group_type &g) const
            {
                auto attr =  g.attributes.template create<T>(_name,_shape,_overwrite);
                return result_type(attr);
            }

            //-----------------------------------------------------------------
            result_type operator()(const field_type &f) const
            {
                auto attr = f.attributes.template create<T>(_name,_shape,_overwrite);
                return result_type(attr);
            }

            //-----------------------------------------------------------------
            result_type operator()(const attribute_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "Cannot create an attribute at an attribute!");
                return result_type();
            }

            //-----------------------------------------------------------------
            result_type operator()(const link_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "Cannot create an attribute on a link!");
                return result_type();
            }
    };

    //-------------------------------------------------------------------------

    template<
             typename T,
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE,
             typename STYPE
            > 
    nxobject<GTYPE,FTYPE,ATYPE,LTYPE> 
    create_attribute(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &parent,
                     const pni::core::string &name,
                     const STYPE &shape,
                     bool overwrite=false)
    {
        typedef create_attribute_visitor<GTYPE,FTYPE,ATYPE,LTYPE,T,STYPE> visitor_t;
        return boost::apply_visitor(visitor_t(name,shape,overwrite),parent);
    }
    
    //-------------------------------------------------------------------------

    template<
             typename T,
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    nxobject<GTYPE,FTYPE,ATYPE,LTYPE> 
    create_attribute(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &parent,
                     const pni::core::string &name,
                     bool overwrite=false)
    {
        using namespace pni::core;
        return create_attribute<T>(parent,name,shape_t{},overwrite);
    }
    
    //------------------------------------------------------------------------

    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE,
             typename ...ARGTS
            >
    nxobject<GTYPE,FTYPE,ATYPE,LTYPE>
    create_attribute(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &o,
                     pni::core::type_id_t tid,
                     ARGTS ...args)
    {
        using namespace pni::core;
        
        if(tid == type_id_t::UINT8)
            return create_attribute<uint8>(o,args...);
        else if(tid == type_id_t::INT8)
            return create_attribute<int8>(o,args...);
        else if(tid == type_id_t::UINT16)
            return create_attribute<uint16>(o,args...);
        else if(tid == type_id_t::INT16)
            return create_attribute<int16>(o,args...);
        else if(tid == type_id_t::UINT32)
            return create_attribute<uint32>(o,args...);
        else if(tid == type_id_t::INT32)
            return create_attribute<int32>(o,args...);
        else if(tid == type_id_t::UINT64)
            return create_attribute<uint64>(o,args...);
        else if(tid == type_id_t::INT64)
            return create_attribute<int64>(o,args...);
        else if(tid == type_id_t::FLOAT32)
            return create_attribute<float32>(o,args...);
        else if(tid == type_id_t::FLOAT64)
            return create_attribute<float64>(o,args...);
        else if(tid == type_id_t::FLOAT128)
            return create_attribute<float128>(o,args...);
        else if(tid == type_id_t::COMPLEX32)
            return create_attribute<complex32>(o,args...);
        else if(tid == type_id_t::COMPLEX64)
            return create_attribute<complex64>(o,args...);
        else if(tid == type_id_t::COMPLEX128)
            return create_attribute<complex128>(o,args...);
        else if(tid == type_id_t::BOOL)
            return create_attribute<bool_t>(o,args...);
        else if(tid == type_id_t::STRING)
            return create_attribute<string>(o,args...);
        else
            throw type_error(EXCEPTION_RECORD,
                    "Unknown type code!");
        
    }

//end of namespace
}
}
}