/***************************************************************************** * * This file is part of Mapnik (c++ mapping toolkit) * * Copyright (C) 2021 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 GEOJSON_DATASOURCE_HPP #define GEOJSON_DATASOURCE_HPP // mapnik #include <mapnik/datasource.hpp> #include <mapnik/params.hpp> #include <mapnik/query.hpp> #include <mapnik/feature.hpp> #include <mapnik/geometry/box2d.hpp> #include <mapnik/coord.hpp> #include <mapnik/feature_layer_desc.hpp> #include <mapnik/unicode.hpp> #include <mapnik/datasource_plugin.hpp> #include <mapnik/warning.hpp> MAPNIK_DISABLE_WARNING_PUSH #include <mapnik/warning_ignore.hpp> #include <boost/optional.hpp> #include <boost/version.hpp> #include <boost/geometry/strategies/cartesian/disjoint_box_box.hpp> #include <boost/geometry/index/rtree.hpp> MAPNIK_DISABLE_WARNING_POP // stl #include <memory> #include <vector> #include <string> #include <map> #include <deque> #include <functional> template<std::size_t Max, std::size_t Min> struct geojson_linear : boost::geometry::index::linear<Max, Min> {}; namespace boost { namespace geometry { namespace index { namespace detail { namespace rtree { template<std::size_t Max, std::size_t Min> struct options_type<geojson_linear<Max, Min>> { using type = options<geojson_linear<Max, Min>, insert_default_tag, choose_by_content_diff_tag, split_default_tag, linear_tag, #if BOOST_VERSION >= 105700 node_variant_static_tag>; #else node_s_mem_static_tag>; #endif }; } // namespace rtree } // namespace detail } // namespace index } // namespace geometry } // namespace boost DATASOURCE_PLUGIN_DEF(geojson_datasource_plugin, geojson); class geojson_datasource : public mapnik::datasource { public: using box_type = mapnik::box2d<double>; using item_type = std::pair<box_type, std::pair<std::uint64_t, std::uint64_t>>; using spatial_index_type = boost::geometry::index::rtree<item_type, geojson_linear<16, 4>>; // constructor geojson_datasource(mapnik::parameters const& params); virtual ~geojson_datasource(); mapnik::datasource::datasource_t type() const; static const char* name(); mapnik::featureset_ptr features(mapnik::query const& q) const; mapnik::featureset_ptr features_at_point(mapnik::coord2d const& pt, double tol = 0) const; mapnik::box2d<double> envelope() const; mapnik::layer_descriptor get_descriptor() const; boost::optional<mapnik::datasource_geometry_t> get_geometry_type() const; template<typename Iterator> void parse_geojson(Iterator start, Iterator end); template<typename Iterator> void initialise_index(Iterator start, Iterator end); void initialise_disk_index(std::string const& filename); private: void initialise_descriptor(mapnik::feature_ptr const&); mapnik::datasource::datasource_t type_; mapnik::layer_descriptor desc_; std::string filename_; bool from_inline_string_; mapnik::box2d<double> extent_; std::vector<mapnik::feature_ptr> features_; std::unique_ptr<spatial_index_type> tree_; bool cache_features_ = true; bool has_disk_index_ = false; const std::size_t num_features_to_query_; }; #endif // GEOJSON_DATASOURCE_HPP