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#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/style/conversion/geojson.hpp>
#include <mbgl/style/source_observer.hpp>
#include <mbgl/tile/tile_id.hpp>
#include <mbgl/storage/file_source.hpp>
#include <mbgl/renderer/sources/render_geojson_source.hpp>
#include <mbgl/util/rapidjson.hpp>
#include <mbgl/util/constants.cpp>
#include <mbgl/util/logging.hpp>
#include <mapbox/geojson.hpp>
#include <mapbox/geojson/rapidjson.hpp>
#include <mapbox/geojsonvt.hpp>
#include <mapbox/geojsonvt/convert.hpp>
#include <supercluster.hpp>
#include <rapidjson/error/en.h>
#include <sstream>
namespace mbgl {
namespace style {
namespace conversion {
template <>
optional<GeoJSON> convertGeoJSON(const JSValue& value, Error& error) {
try {
return mapbox::geojson::convert(value);
} catch (const std::exception& ex) {
error = { ex.what() };
return {};
}
}
} // namespace conversion
class GeoJSONVTData : public GeoJSONData {
public:
GeoJSONVTData(const GeoJSON& geoJSON,
const mapbox::geojsonvt::Options& options)
: impl(geoJSON, options) {}
mapbox::geometry::feature_collection<int16_t> getTile(const CanonicalTileID& tileID) final {
return impl.getTile(tileID.z, tileID.x, tileID.y).features;
}
private:
mapbox::geojsonvt::GeoJSONVT impl;
};
class SuperclusterData : public GeoJSONData {
public:
SuperclusterData(const mapbox::geometry::feature_collection<double>& features,
const mapbox::supercluster::Options& options)
: impl(features, options) {}
mapbox::geometry::feature_collection<int16_t> getTile(const CanonicalTileID& tileID) final {
return impl.getTile(tileID.z, tileID.x, tileID.y);
}
private:
mapbox::supercluster::Supercluster impl;
};
GeoJSONSource::Impl::Impl(std::string id_, Source& base_, const GeoJSONOptions options_)
: Source::Impl(SourceType::GeoJSON, std::move(id_), base_), options(options_) {
}
GeoJSONSource::Impl::~Impl() = default;
void GeoJSONSource::Impl::setURL(std::string url_) {
url = std::move(url_);
// Signal that the source description needs a reload
if (loaded || req) {
loaded = false;
req.reset();
observer->onSourceDescriptionChanged(base);
}
}
optional<std::string> GeoJSONSource::Impl::getURL() const {
return url;
}
void GeoJSONSource::Impl::setGeoJSON(const GeoJSON& geoJSON) {
req.reset();
_setGeoJSON(geoJSON);
}
void GeoJSONSource::Impl::_setGeoJSON(const GeoJSON& geoJSON) {
double scale = util::EXTENT / util::tileSize;
if (options.cluster
&& geoJSON.is<mapbox::geometry::feature_collection<double>>()
&& !geoJSON.get<mapbox::geometry::feature_collection<double>>().empty()) {
mapbox::supercluster::Options clusterOptions;
clusterOptions.maxZoom = options.clusterMaxZoom;
clusterOptions.extent = util::EXTENT;
clusterOptions.radius = std::round(scale * options.clusterRadius);
data = std::make_unique<SuperclusterData>(
geoJSON.get<mapbox::geometry::feature_collection<double>>(), clusterOptions);
} else {
mapbox::geojsonvt::Options vtOptions;
vtOptions.maxZoom = options.maxzoom;
vtOptions.extent = util::EXTENT;
vtOptions.buffer = std::round(scale * options.buffer);
vtOptions.tolerance = scale * options.tolerance;
data = std::make_unique<GeoJSONVTData>(geoJSON, vtOptions);
}
}
void GeoJSONSource::Impl::loadDescription(FileSource& fileSource) {
if (!url) {
loaded = true;
return;
}
if (req) {
return;
}
req = fileSource.request(Resource::source(*url), [this](Response res) {
if (res.error) {
observer->onSourceError(
base, std::make_exception_ptr(std::runtime_error(res.error->message)));
} else if (res.notModified) {
return;
} else if (res.noContent) {
observer->onSourceError(
base, std::make_exception_ptr(std::runtime_error("unexpectedly empty GeoJSON")));
} else {
rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> d;
d.Parse<0>(res.data->c_str());
if (d.HasParseError()) {
std::stringstream message;
message << d.GetErrorOffset() << " - "
<< rapidjson::GetParseError_En(d.GetParseError());
observer->onSourceError(base,
std::make_exception_ptr(std::runtime_error(message.str())));
return;
}
conversion::Error error;
optional<GeoJSON> geoJSON = conversion::convertGeoJSON<JSValue>(d, error);
if (!geoJSON) {
Log::Error(Event::ParseStyle, "Failed to parse GeoJSON data: %s",
error.message.c_str());
// Create an empty GeoJSON VT object to make sure we're not infinitely waiting for
// tiles to load.
_setGeoJSON(GeoJSON{ FeatureCollection{} });
} else {
_setGeoJSON(*geoJSON);
}
loaded = true;
observer->onSourceLoaded(base);
}
});
}
std::unique_ptr<RenderSource> GeoJSONSource::Impl::createRenderSource() const {
return std::make_unique<RenderGeoJSONSource>(*this);
}
Range<uint8_t> GeoJSONSource::Impl::getZoomRange() const {
return { 0, options.maxzoom };
}
GeoJSONData* GeoJSONSource::Impl::getData() const {
return data.get();
}
} // namespace style
} // namespace mbgl
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