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#include <mbgl/storage/file_source.hpp>
#include <mbgl/style/conversion/geojson.hpp>
#include <mbgl/style/conversion/json.hpp>
#include <mbgl/style/layer.hpp>
#include <mbgl/style/source_observer.hpp>
#include <mbgl/style/sources/geojson_source.hpp>
#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/tile/tile.hpp>
#include <mbgl/util/async_request.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/util/thread_pool.hpp>
namespace mbgl {
namespace style {
// static
Immutable<GeoJSONOptions> GeoJSONOptions::defaultOptions() {
static Immutable<GeoJSONOptions> options = makeMutable<GeoJSONOptions>();
return options;
}
GeoJSONSource::GeoJSONSource(std::string id, Immutable<GeoJSONOptions> options)
: Source(makeMutable<Impl>(std::move(id), std::move(options))), threadPool(Scheduler::GetBackground()) {}
GeoJSONSource::~GeoJSONSource() = default;
const GeoJSONSource::Impl& GeoJSONSource::impl() const {
return static_cast<const Impl&>(*baseImpl);
}
void GeoJSONSource::setURL(const std::string& url_) {
url = url_;
// Signal that the source description needs a reload
if (loaded || req) {
loaded = false;
req.reset();
observer->onSourceDescriptionChanged(*this);
}
}
namespace {
inline std::shared_ptr<GeoJSONData> createGeoJSONData(const mapbox::geojson::geojson& geoJSON,
const GeoJSONSource::Impl& impl) {
if (auto data = impl.getData().lock()) {
return GeoJSONData::create(geoJSON, impl.getOptions(), data->getScheduler());
}
return GeoJSONData::create(geoJSON, impl.getOptions());
}
} // namespace
void GeoJSONSource::setGeoJSON(const mapbox::geojson::geojson& geoJSON) {
setGeoJSONData(createGeoJSONData(geoJSON, impl()));
}
void GeoJSONSource::setGeoJSONData(std::shared_ptr<GeoJSONData> geoJSONData) {
req.reset();
baseImpl = makeMutable<Impl>(impl(), std::move(geoJSONData));
observer->onSourceChanged(*this);
}
void GeoJSONSource::setSourceData(SourceData data) {
if (data.url) {
setURL(*data.url);
} else if (data.geoJSON) {
setGeoJSON(*data.geoJSON);
} else if (data.geoJSONData) {
setGeoJSONData(std::move(data.geoJSONData));
}
}
SourceDataResult GeoJSONSource::getSourceData() const {
SourceDataResult result{impl().getData()};
if (url) {
result.url = &*url;
}
return result;
}
optional<std::string> GeoJSONSource::getURL() const {
return url;
}
const GeoJSONOptions& GeoJSONSource::getOptions() const {
return *impl().getOptions();
}
void GeoJSONSource::loadDescription(FileSource& fileSource) {
if (!url) {
loaded = true;
return;
}
if (req) {
return;
}
req = fileSource.request(Resource::source(*url), [this](const Response& res) {
if (res.error) {
observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error(res.error->message)));
} else if (res.notModified) {
return;
} else if (res.noContent) {
observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error("unexpectedly empty GeoJSON")));
} else {
auto makeImplInBackground = [currentImpl = baseImpl, data = res.data]() -> Immutable<Source::Impl> {
assert(data);
auto& current = static_cast<const Impl&>(*currentImpl);
conversion::Error error;
std::shared_ptr<GeoJSONData> geoJSONData;
if (optional<GeoJSON> geoJSON = conversion::convertJSON<GeoJSON>(*data, error)) {
geoJSONData = createGeoJSONData(*geoJSON, current);
} else {
// Create an empty GeoJSON VT object to make sure we're not infinitely waiting for tiles to load.
Log::Error(Event::ParseStyle, "Failed to parse GeoJSON data: %s", error.message.c_str());
}
return makeMutable<Impl>(current, std::move(geoJSONData));
};
auto onImplReady = [this, self = makeWeakPtr(), capturedReq = req.get()](Immutable<Source::Impl> newImpl) {
assert(capturedReq);
if (!self) return; // This source has been deleted.
if (capturedReq != req.get()) return; // A new request is being processed, ignore this impl.
baseImpl = std::move(newImpl);
loaded = true;
observer->onSourceLoaded(*this);
};
threadPool->scheduleAndReplyValue(makeImplInBackground, onImplReady);
}
});
}
bool GeoJSONSource::supportsLayerType(const mbgl::style::LayerTypeInfo* info) const {
return mbgl::underlying_type(TileKind::Geometry) == mbgl::underlying_type(info->tileKind);
}
Mutable<Source::Impl> GeoJSONSource::createMutable() const noexcept {
return staticMutableCast<Source::Impl>(makeMutable<Impl>(impl()));
}
Value GeoJSONSource::serialize() const {
auto value = Source::serialize();
assert(value.getObject());
if (url.has_value()) {
value.getObject()->insert({"data", url.value()});
}
return value;
}
} // namespace style
} // namespace mbgl
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