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#include <mbgl/util/logging.hpp>
#include <mbgl/storage/file_source.hpp>
#include <mbgl/style/conversion/geojson.hpp>
#include <mbgl/style/source_observer.hpp>
#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/tile/geojson_tile.hpp>
#include <mbgl/util/rapidjson.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 <>
Result<GeoJSON> convertGeoJSON(const JSValue& value) {
try {
return mapbox::geojson::convert(value);
} catch (const std::exception& ex) {
return Error{ ex.what() };
}
}
} // namespace conversion
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() {
return url;
}
void GeoJSONSource::Impl::setGeoJSON(const GeoJSON& geoJSON) {
req.reset();
_setGeoJSON(geoJSON);
}
//Private implementation
void GeoJSONSource::Impl::_setGeoJSON(const GeoJSON& geoJSON) {
double scale = util::EXTENT / util::tileSize;
cache.clear();
if (!options.cluster) {
mapbox::geojsonvt::Options vtOptions;
vtOptions.maxZoom = options.maxzoom;
vtOptions.extent = util::EXTENT;
vtOptions.buffer = std::round(scale * options.buffer);
vtOptions.tolerance = scale * options.tolerance;
geoJSONOrSupercluster = std::make_unique<mapbox::geojsonvt::GeoJSONVT>(geoJSON, vtOptions);
} else {
mapbox::supercluster::Options clusterOptions;
clusterOptions.maxZoom = options.clusterMaxZoom;
clusterOptions.extent = util::EXTENT;
clusterOptions.radius = std::round(scale * options.clusterRadius);
const auto& features = geoJSON.get<mapbox::geometry::feature_collection<double>>();
geoJSONOrSupercluster =
std::make_unique<mapbox::supercluster::Supercluster>(features, clusterOptions);
}
for (auto const &item : tiles) {
GeoJSONTile* geoJSONTile = static_cast<GeoJSONTile*>(item.second.get());
setTileData(*geoJSONTile, geoJSONTile->id);
}
}
void GeoJSONSource::Impl::setTileData(GeoJSONTile& tile, const OverscaledTileID& tileID) {
if (geoJSONOrSupercluster.is<GeoJSONVTPointer>()) {
tile.updateData(geoJSONOrSupercluster.get<GeoJSONVTPointer>()->getTile(tileID.canonical.z,
tileID.canonical.x,
tileID.canonical.y).features);
} else {
assert(geoJSONOrSupercluster.is<SuperclusterPointer>());
tile.updateData(geoJSONOrSupercluster.get<SuperclusterPointer>()->getTile(tileID.canonical.z,
tileID.canonical.x,
tileID.canonical.y));
}
}
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;
}
invalidateTiles();
conversion::Result<GeoJSON> geoJSON = conversion::convertGeoJSON<JSValue>(d);
if (!geoJSON) {
Log::Error(Event::ParseStyle, "Failed to parse GeoJSON data: %s",
geoJSON.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);
}
});
}
Range<uint8_t> GeoJSONSource::Impl::getZoomRange() {
assert(loaded);
return { 0, options.maxzoom };
}
std::unique_ptr<Tile> GeoJSONSource::Impl::createTile(const OverscaledTileID& tileID,
const UpdateParameters& parameters) {
assert(loaded);
auto tilePointer = std::make_unique<GeoJSONTile>(tileID, base.getID(), parameters);
setTileData(*tilePointer.get(), tileID);
return std::move(tilePointer);
}
} // namespace style
} // namespace mbgl
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