create_group.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 3, 2013
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
#pragma once

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

namespace pni{
namespace io{
namespace nx{

    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    class create_group_visitor : public boost::static_visitor<
                                    nxobject<GTYPE,FTYPE,ATYPE,LTYPE>  
                                 >
    {
        private:
            pni::core::string _name; 
            pni::core::string _class; 
        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_group_visitor(const pni::core::string &n,
                                 const pni::core::string &c):
                _name(n),
                _class(c)
            {}

            //-----------------------------------------------------------------
            result_type operator()(const group_type &g) const
            {
                using namespace pni::core;
                
                group_type group;
                if(!_name.empty())
                {
                    if(!_class.empty())
                        group = g.create_group(_name,_class);
                    else
                        group = g.create_group(_name);
                }
                else
                    //you have to at least provide a name
                    throw value_error(EXCEPTION_RECORD,
                            "No name provided for the new group!");

                return result_type(group);

            }

            //-----------------------------------------------------------------
            result_type operator()(const field_type &) const
            {
                using namespace pni::core;
                
                throw type_error(EXCEPTION_RECORD,
                        "Cannot create a group below a field!");
                return result_type();
            }

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

    };

    //-------------------------------------------------------------------------
    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE,
             typename PATHT
            > 
    nxobject<GTYPE,FTYPE,ATYPE,LTYPE>
    create_group(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &o,const PATHT &path)
    {
        using visitor_type = create_group_visitor<GTYPE,FTYPE,ATYPE,LTYPE>;
        using object_type = nxobject<GTYPE,FTYPE,ATYPE,LTYPE>;

        nxpath parent_path(get_path(path));
        nxpath::element_type e = parent_path.back();
        parent_path.pop_back();

        object_type parent;

        if(parent_path.size())
            parent = get_object(o,parent_path);
        else
            parent = o;

        return boost::apply_visitor(visitor_type(e.first,e.second),parent);
    }

//end of namespace
}
}
}