124 lines
4.1 KiB
C++
124 lines
4.1 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef GEOJSON_DATASOURCE_HPP
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#define GEOJSON_DATASOURCE_HPP
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// mapnik
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#include <mapnik/datasource.hpp>
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#include <mapnik/params.hpp>
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#include <mapnik/query.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/geometry/box2d.hpp>
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#include <mapnik/coord.hpp>
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#include <mapnik/feature_layer_desc.hpp>
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#include <mapnik/unicode.hpp>
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#include <mapnik/datasource_plugin.hpp>
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#include <mapnik/warning.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore.hpp>
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#include <boost/version.hpp>
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#include <boost/geometry/strategies/cartesian/disjoint_box_box.hpp>
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#include <boost/geometry/index/rtree.hpp>
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MAPNIK_DISABLE_WARNING_POP
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// stl
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#include <memory>
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#include <vector>
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#include <string>
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#include <map>
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#include <deque>
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#include <functional>
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#include <optional>
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template<std::size_t Max, std::size_t Min>
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struct geojson_linear : boost::geometry::index::linear<Max, Min>
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{};
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namespace boost {
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namespace geometry {
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namespace index {
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namespace detail {
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namespace rtree {
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template<std::size_t Max, std::size_t Min>
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struct options_type<geojson_linear<Max, Min>>
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{
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using type = options<geojson_linear<Max, Min>,
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insert_default_tag,
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choose_by_content_diff_tag,
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split_default_tag,
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linear_tag,
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#if BOOST_VERSION >= 105700
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node_variant_static_tag>;
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#else
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node_s_mem_static_tag>;
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#endif
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};
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} // namespace rtree
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} // namespace detail
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} // namespace index
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} // namespace geometry
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} // namespace boost
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DATASOURCE_PLUGIN_DEF(geojson_datasource_plugin, geojson);
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class geojson_datasource : public mapnik::datasource
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{
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public:
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using box_type = mapnik::box2d<double>;
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using item_type = std::pair<box_type, std::pair<std::uint64_t, std::uint64_t>>;
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using spatial_index_type = boost::geometry::index::rtree<item_type, geojson_linear<16, 4>>;
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// constructor
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geojson_datasource(mapnik::parameters const& params);
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virtual ~geojson_datasource();
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mapnik::datasource::datasource_t type() const override;
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static const char* name();
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mapnik::featureset_ptr features(mapnik::query const& q) const override;
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mapnik::featureset_ptr features_at_point(mapnik::coord2d const& pt, double tol = 0) const override;
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mapnik::box2d<double> envelope() const override;
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mapnik::layer_descriptor get_descriptor() const override;
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std::optional<mapnik::datasource_geometry_t> get_geometry_type() const override;
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template<typename Iterator>
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void parse_geojson(Iterator start, Iterator end);
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template<typename Iterator>
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void initialise_index(Iterator start, Iterator end);
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void initialise_disk_index(std::string const& filename);
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private:
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void initialise_descriptor(mapnik::feature_ptr const&);
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mapnik::datasource::datasource_t type_;
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mapnik::layer_descriptor desc_;
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std::string filename_;
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bool from_inline_string_;
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mapnik::box2d<double> extent_;
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std::vector<mapnik::feature_ptr> features_;
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std::unique_ptr<spatial_index_type> tree_;
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bool cache_features_ = true;
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bool has_disk_index_ = false;
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const std::size_t num_features_to_query_;
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};
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#endif // GEOJSON_DATASOURCE_HPP
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