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#include <mbgl/style/tile_source_impl.hpp>
#include <mbgl/style/source_observer.hpp>
#include <mbgl/style/rapidjson_conversion.hpp>
#include <mbgl/style/conversion/tileset.hpp>
#include <mbgl/util/tileset.hpp>
#include <mbgl/util/mapbox.hpp>
#include <mbgl/storage/file_source.hpp>
#include <rapidjson/document.h>
#include <rapidjson/error/en.h>
#include <sstream>
namespace mbgl {
namespace style {
Tileset TileSourceImpl::parseTileJSON(const std::string& json, const std::string& sourceURL, SourceType type, uint16_t tileSize) {
rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> document;
document.Parse<0>(json.c_str());
if (document.HasParseError()) {
std::stringstream message;
message << document.GetErrorOffset() << " - " << rapidjson::GetParseError_En(document.GetParseError());
throw std::runtime_error(message.str());
}
conversion::Error error;
optional<Tileset> result = conversion::convert<Tileset, JSValue>(document, error);
if (!result) {
throw std::runtime_error(error.message);
}
// TODO: Remove this hack by delivering proper URLs in the TileJSON to begin with.
if (util::mapbox::isMapboxURL(sourceURL)) {
for (auto& url : (*result).tiles) {
url = util::mapbox::canonicalizeTileURL(url, type, tileSize);
}
}
return *result;
}
TileSourceImpl::TileSourceImpl(SourceType type_, std::string id_, Source& base_,
variant<std::string, Tileset> urlOrTileset_,
uint16_t tileSize_)
: Impl(type_, std::move(id_), base_),
urlOrTileset(std::move(urlOrTileset_)),
tileSize(tileSize_) {
}
TileSourceImpl::~TileSourceImpl() = default;
void TileSourceImpl::loadDescription(FileSource& fileSource) {
if (urlOrTileset.is<Tileset>()) {
tileset = urlOrTileset.get<Tileset>();
loaded = true;
return;
}
if (req) {
return;
}
const std::string& url = urlOrTileset.get<std::string>();
req = fileSource.request(Resource::source(url), [this, url](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 TileJSON")));
} else {
Tileset newTileset;
// Create a new copy of the Tileset object that holds the base values we've parsed
// from the stylesheet. Then merge in the values parsed from the TileJSON we retrieved
// via the URL.
try {
newTileset = parseTileJSON(*res.data, url, type, tileSize);
} catch (...) {
observer->onSourceError(base, std::current_exception());
return;
}
bool attributionChanged = tileset.attribution != newTileset.attribution;
tileset = newTileset;
loaded = true;
observer->onSourceLoaded(base);
if (attributionChanged) {
observer->onSourceChanged(base);
}
}
});
}
optional<Tileset> TileSourceImpl::getTileset() const {
if (loaded) {
return tileset;
}
return {};
}
optional<std::string> TileSourceImpl::getAttribution() const {
if (loaded && !tileset.attribution.empty()) {
return tileset.attribution;
} else {
return {};
}
}
} // namespace style
} // namespace mbgl
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