iterators.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: Sep 12, 2014
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
#pragma once

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

namespace pni{
namespace io{
namespace nx{

    //------------------------------------------------------------------------
    template<
             template<nximp_code> class OTYPE,
             nximp_code IMPID
            >
    auto begin(const OTYPE<IMPID> &group) -> decltype(group.begin())
    {
        using group_type = typename nxobject_trait<IMPID>::group_type;
        static_assert(std::is_same<group_type,OTYPE<IMPID>>::value,
                      "Object must be a group type!");

        return group.begin();
    }

    //------------------------------------------------------------------------
    template<
             template<nximp_code> class OTYPE,
             nximp_code IMPID
            >
    auto end(const OTYPE<IMPID> &group) -> decltype(group.end())
    {
        using group_type = typename nxobject_trait<IMPID>::group_type;
        static_assert(std::is_same<group_type,OTYPE<IMPID>>::value,
                      "Object must be a group type!");

        return group.end();
    }

    //------------------------------------------------------------------------
    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    class begin_visitor : public boost::static_visitor<typename GTYPE::iterator>
    {
        public:
            using result_type = typename GTYPE::iterator;
            using group_type = GTYPE;
            using field_type = FTYPE;
            using attribute_type = ATYPE;
            using link_type = LTYPE;

            //-----------------------------------------------------------------
            result_type operator()(const group_type &g) const
            {
                return begin(g);
            }

            //-----------------------------------------------------------------
            result_type operator()(const field_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "Fields do not have children!");
            }

            //-----------------------------------------------------------------
            result_type operator()(const attribute_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "Attributes do not have children!");

            }
            
            //-----------------------------------------------------------------
            result_type operator()(const link_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "links do not have children!");

            }
    };

    //========================================================================
    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    typename GTYPE::iterator
    begin(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &o)
    {
        using visitor_type = begin_visitor<GTYPE,FTYPE,ATYPE,LTYPE>;
        return boost::apply_visitor(visitor_type(),o);
    }


    //------------------------------------------------------------------------
    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    class end_visitor : public boost::static_visitor<typename GTYPE::iterator>
    {
        public:
            using result_type = typename GTYPE::iterator;
            using group_type = GTYPE;
            using field_type = FTYPE;
            using attribute_type = ATYPE;
            using link_type = LTYPE;

            //-----------------------------------------------------------------
            result_type operator()(const group_type &g) const
            {
                return end(g);
            }

            //-----------------------------------------------------------------
            result_type operator()(const field_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "Fields do not have children!");
            }

            //-----------------------------------------------------------------
            result_type operator()(const attribute_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "Attributes do not have children!");

            }
            
            //-----------------------------------------------------------------
            result_type operator()(const link_type &) const
            {
                using namespace pni::core;
                throw type_error(EXCEPTION_RECORD,
                        "Links do not have children!");

            }
    };

    template<
             typename GTYPE,
             typename FTYPE,
             typename ATYPE,
             typename LTYPE
            > 
    typename GTYPE::iterator
    end(const nxobject<GTYPE,FTYPE,ATYPE,LTYPE> &o)
    {
        using visitor_type = end_visitor<GTYPE,FTYPE,ATYPE,LTYPE>;
        return boost::apply_visitor(visitor_type(),o);
    }
//end of namespace
}
}
}