get_path.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 18, 2013
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
#pragma once

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

namespace pni{
namespace io{
namespace nx{
    

    template< 
              template<nximp_code> class OTYPE,
              nximp_code IMPID 
            >
    pni::core::string get_path(const OTYPE<IMPID> &o)
    {
        using object_type = typename nxobject_trait<IMPID>::object_type;

        return get_path(object_type(o));
    }
   
    //------------------------------------------------------------------------
    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    class get_path_visitor : public boost::static_visitor<pni::core::string>
    {
        private:
            pni::core::string element_name(const pni::core::string &name,
                                           const pni::core::string &type) const
            {
                pni::core::string ename(name);

                if((!type.empty()) && (type!="NXroot")) 
                    ename += ":" + type;

                return ename;
            }
        public:
            using result_type = pni::core::string;
            using group_type = GTYPE;
            using field_type = FTYPE;
            using attribute_type = ATYPE;
            using link_type = LTYPE;

            //-----------------------------------------------------------------
            result_type operator()(const group_type &g) const
            {
                typedef nxobject<GTYPE,FTYPE,ATYPE,LTYPE> object_type;

                //determine the name and the type of the group
                pni::core::string group_name = g.name();
                pni::core::string group_type = get_class(object_type(g));
               
                //assemble the element name
                pni::core::string ename = element_name(group_name,group_type);

                //the recursion is done when we arrived at the root group
                if((group_type == "NXroot") || (group_name == "/"))
                    return ename;
                else
                    return get_path(g.parent()) + "/" + ename;

            }

            //-----------------------------------------------------------------
            result_type operator()(const field_type &f) const
            {
                return get_path(f.parent())+"/"+f.name();
            }

            //-----------------------------------------------------------------
            result_type operator()(const attribute_type &a) const
            {
                return get_path(a.parent())+"@"+a.name();
            }

            result_type operator()(const link_type &l) const
            {
                return get_path(l.parent())+"/"+l.name();
            }
    };

    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    pni::core::string get_path(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &o)
    {
        pni::core::string path = boost::apply_visitor(get_path_visitor<GTYPE,FTYPE,ATYPE,LTYPE>(),o);

        //repair two leading // which can happen in some cases
        if((path.size()>=2) && 
           (path[0]=='/')   && 
           (path[1]=='/'))
        {
            return pni::core::string(path,1,path.size()-1);
        }
        else
            return path;
    }

//end of namespace
}
}
}