mapnik/plugins/input/shape/shape_io.hpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2024 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#ifndef SHAPE_IO_HPP
#define SHAPE_IO_HPP

// stl
#include <memory>
#include <ios>
// mapnik
#include <mapnik/geometry/box2d.hpp>
#include <mapnik/util/noncopyable.hpp>
#include <mapnik/util/spatial_index.hpp>
// boost
#include <boost/optional.hpp>
//
#include "dbfile.hpp"
#include "shapefile.hpp"

struct shape_io : mapnik::util::noncopyable
{
  public:
    enum shapeType {
        shape_null = 0,
        shape_point = 1,
        shape_polyline = 3,
        shape_polygon = 5,
        shape_multipoint = 8,
        shape_pointz = 11,
        shape_polylinez = 13,
        shape_polygonz = 15,
        shape_multipointz = 18,
        shape_pointm = 21,
        shape_polylinem = 23,
        shape_polygonm = 25,
        shape_multipointm = 28,
        shape_multipatch = 31
    };

    shape_io(std::string const& shape_name, bool open_index = true);
    ~shape_io();

    shape_file& shp();
    shape_file& shx();
    dbf_file& dbf();

    inline boost::optional<shape_file&> index()
    {
        if (index_)
            return boost::optional<shape_file&>(*index_);
        return boost::optional<shape_file&>();
    }

    inline bool has_index() const
    {
        if (index_ && index_->is_open())
        {
            bool status = mapnik::util::check_spatial_index(index_->file());
            index_->seek(0); // rewind
            return status;
        }
        return false;
    }

    inline int id() const { return id_; }
    void move_to(std::streampos pos);
    static void read_bbox(shape_file::record_type& record, mapnik::box2d<double>& bbox);
    static mapnik::geometry::geometry<double> read_polyline(shape_file::record_type& record);
    static mapnik::geometry::geometry<double> read_polygon(shape_file::record_type& record);
    static mapnik::geometry::geometry<double> read_polyline_parts(shape_file::record_type& record,
                                                                  std::vector<std::pair<int, int>> const& parts);
    static mapnik::geometry::geometry<double> read_polygon_parts(shape_file::record_type& record,
                                                                 std::vector<std::pair<int, int>> const& parts);

    shapeType type_;
    shape_file shp_;
    shape_file shx_;
    dbf_file dbf_;
    std::unique_ptr<shape_file> index_;
    int reclength_;
    int id_;
    box2d<double> cur_extent_;

    static const std::string SHP;
    static const std::string SHX;
    static const std::string DBF;
    static const std::string INDEX;
};

#endif // SHAPE_IO_HPP