group.hpp

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//
// (c) Copyright 2014 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: Nov 26, 2014
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
#pragma once

#include <pni/core/types.hpp>

#include "../nxobject.hpp"
#include "../algorithms/create_field.hpp"
#include "../algorithms/create_group.hpp"
#include "../algorithms/get_name.hpp"
#include "../algorithms/get_class.hpp"
#include "../algorithms/set_class.hpp"
#include "node.hpp"
#include "data_node.hpp"


namespace pni{
namespace io{
namespace nx{
namespace xml{

    struct group
    {

        template<
                 typename GTYPE,
                 typename FTYPE,
                 typename ATYPE,
                 typename LTYPE
                >
        static nxobject<GTYPE,FTYPE,ATYPE,LTYPE>
        object_from_xml(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &parent,
                        const node &group_node)
        {
            using namespace pni::core; 
            //typedef GTYPE group_type;
            //typedef typename GTYPE::value_type object_type;

            //check if the group tag provides a name attribute
            if(!has_attribute(group_node,"name"))
                throw value_error(EXCEPTION_RECORD,
                        "XML group does not provide a name!");

            //fetch the name for the group
            node name_attr = get_attribute(group_node,"name");
            string name    = data_node::read(name_attr);
            
            if(name == "/"  && get_name(parent) == "/")
                return parent;

            //create the group
            auto group     = create_group(parent,name);

            //if the tag has a type attribute add its value as an NX_class
            //attribute
            if(has_attribute(group_node,"type"))
            {
                node class_attr = get_attribute(group_node,"type");
                string gclass = data_node::read(class_attr);

                set_class(group,gclass);
            }
            
            return group;
        }

        //-----------------------------------------------------------------
        template<
                 typename GTYPE,
                 typename FTYPE,
                 typename ATYPE,
                 typename LTYPE
                >
        static node object_to_xml(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &group)
        {
            node group_node;

            //write name and type attributes
            group_node.put("<xmlattr>.name",get_name(group));

            pni::core::string gclass = get_class(group);
            if(!gclass.empty())
                group_node.put("<xmlattr>.type",gclass);
            
            return group_node;
        }
    };

//end of namespace
}
}
}
}