add create_feature helper method (geojson_value -> mapnik::feature_impl)
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include/mapnik/json/create_feature.hpp
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include/mapnik/json/create_feature.hpp
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/*****************************************************************************
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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) 2016 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 MAPNIK_JSON_CREATE_FEATURE_HPP
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#define MAPNIK_JSON_CREATE_FEATURE_HPP
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#include <mapnik/json/json_grammar_config.hpp>
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#include <mapnik/json/geojson_grammar_x3.hpp>
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#include <mapnik/json/create_geometry.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/value.hpp>
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#include <mapnik/unicode.hpp>
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#include <mapnik/feature.hpp>
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namespace mapnik { namespace json {
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struct stringifier
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{
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std::string operator()(std::string const& val) const
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{
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return "\"" + val + "\"";
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}
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std::string operator()(value_null) const
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{
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return "null";
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}
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std::string operator()(value_bool val) const
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{
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return val ? "true" : "false";
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}
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std::string operator()(value_integer val) const
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{
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std::string str;
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util::to_string(str, val);
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return str;
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}
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std::string operator()(value_double val) const
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{
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std::string str;
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util::to_string(str, val);
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return str;
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}
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std::string operator()(mapnik::json::geojson_array const& array) const
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{
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std::string str = "[";
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bool first = true;
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for (auto const& val : array)
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{
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if (first) first = false;
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else str += ",";
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str += mapnik::util::apply_visitor(*this, val);
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}
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str += "]";
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return str;
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}
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std::string operator()(mapnik::json::geojson_object const& object, keys_map const& keys) const
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{
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std::string str = "{";
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bool first = true;
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for (auto const& kv : object)
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{
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auto itr = keys.right.find(std::get<0>(kv));
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if (itr != keys.right.end())
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{
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if (first) first = false;
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else str += ",";
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str += "\"" + itr->second + "\"";
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str += ":";
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str += mapnik::util::apply_visitor(*this, kv.second);
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}
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}
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str += "}";
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return str;
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}
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template <typename T>
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std::string operator()(T const&) const
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{
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return "";
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}
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};
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struct attribute_value_visitor
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{
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public:
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attribute_value_visitor(mapnik::transcoder const& tr, keys_map const& keys)
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: tr_(tr),
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keys_(keys) {}
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mapnik::value operator()(std::string const& val) const
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{
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return mapnik::value(tr_.transcode(val.c_str()));
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}
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mapnik::value operator()(mapnik::json::geojson_array const& array) const
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{
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std::string str = stringifier()(array);
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return mapnik::value(tr_.transcode(str.c_str()));
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}
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mapnik::value operator()(mapnik::json::geojson_object const& object) const
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{
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std::string str = stringifier()(object, keys_);
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return mapnik::value(tr_.transcode(str.c_str()));
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}
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mapnik::value operator() (mapnik::value_bool val) const
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{
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return mapnik::value(val);
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}
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mapnik::value operator() (mapnik::value_integer val) const
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{
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return mapnik::value(val);
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}
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mapnik::value operator() (mapnik::value_double val) const
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{
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return mapnik::value(val);
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}
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template <typename T>
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mapnik::value operator()(T const& val) const
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{
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return mapnik::value_null{};
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}
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mapnik::transcoder const& tr_;
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mapnik::json::keys_map const& keys_;
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};
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void create_feature(feature_impl & feature,
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mapnik::json::geojson_value const& value,
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mapnik::json::keys_map const& keys,
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mapnik::transcoder const& tr)
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{
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if (!value.is<mapnik::json::geojson_object>())
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{
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throw std::runtime_error("Expecting an GeoJSON object");
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}
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mapnik::json::geojson_object const& feature_value = mapnik::util::get<mapnik::json::geojson_object>(value);
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for (auto const& elem : feature_value)
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{
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auto const key = std::get<0>(elem);
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if (key == mapnik::json::well_known_names::geometry)
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{
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auto const& geom_value = std::get<1>(elem);
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if (!geom_value.is<mapnik::json::geojson_object>())
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{
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throw std::runtime_error("\"geometry\": xxx <-- expecting an JSON object here");
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}
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auto const& geometry = mapnik::util::get<mapnik::json::geojson_object>(geom_value);
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mapnik::geometry::geometry_types geom_type;
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mapnik::json::positions const* coordinates = nullptr;
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for (auto & elem2 : geometry)
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{
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auto const key2 = std::get<0>(elem2);
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if (key2 == mapnik::json::well_known_names::type)
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{
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auto const& geom_type_value = std::get<1>(elem2);
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if (!geom_type_value.is<mapnik::geometry::geometry_types>())
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{
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throw std::runtime_error("\"type\": xxx <-- expecting an GeoJSON geometry type here");
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}
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geom_type = mapnik::util::get<mapnik::geometry::geometry_types>(geom_type_value);
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if (geom_type == mapnik::geometry::geometry_types::GeometryCollection)
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{
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throw std::runtime_error("GeometryCollections are not allowed");
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}
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}
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else if (key2 == mapnik::json::well_known_names::coordinates)
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{
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auto const& coordinates_value = std::get<1>(elem2);
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if (!coordinates_value.is<mapnik::json::positions>())
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{
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throw std::runtime_error("\"coordinates\": xxx <-- expecting an GeoJSON positions here");
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}
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coordinates = &mapnik::util::get<mapnik::json::positions>(coordinates_value);
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}
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}
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mapnik::geometry::geometry<double> geom;
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mapnik::json::create_geometry(geom, geom_type, *coordinates);
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feature.set_geometry(std::move(geom));
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}
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else if (key == mapnik::json::well_known_names::properties)
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{
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auto const& prop_value = std::get<1>(elem);
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if (!prop_value.is<mapnik::json::geojson_object>())
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{
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throw std::runtime_error("\"properties\": xxx <-- expecting an JSON object here");
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}
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auto const& properties = mapnik::util::get<mapnik::json::geojson_object>(prop_value);
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auto end = keys.right.end();
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for (auto const& kv : properties)
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{
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auto itr = keys.right.find(std::get<0>(kv));
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if (itr != end)
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{
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feature.put_new(itr->second,
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mapnik::util::apply_visitor(mapnik::json::attribute_value_visitor(tr, keys),
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std::get<1>(kv)));
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}
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}
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}
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}
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}
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}}
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#endif //MAPNIK_JSON_CREATE_FEATURE_HPP
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