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#include <mbgl/style/tile_source.hpp>
#include <mbgl/style/source_observer.hpp>
#include <mbgl/style/parser.hpp>
#include <mbgl/util/tileset.hpp>
#include <mbgl/storage/file_source.hpp>
namespace mbgl {
namespace style {
TileSource::TileSource(SourceType type_,
std::string id_,
std::string url_,
uint16_t tileSize_,
std::unique_ptr<Tileset>&& tileset_)
: Source(type_, std::move(id_)),
tileSize(tileSize_),
url(std::move(url_)),
tileset(std::move(tileset_)) {
}
TileSource::~TileSource() = default;
Range<uint8_t> TileSource::getZoomRange() {
return tileset->zoomRange;
}
void TileSource::load(FileSource& fileSource) {
if (url.empty()) {
// If the URL is empty, the TileJSON was specified inline in the stylesheet.
loaded = true;
return;
}
if (req) {
return;
}
// URL may either be a TileJSON file, or a GeoJSON file.
req = fileSource.request(Resource::source(url), [this](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 TileJSON")));
} else {
std::unique_ptr<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 = style::parseTileJSON(*res.data, url, type, tileSize);
} catch (...) {
observer->onSourceError(*this, std::current_exception());
return;
}
// Check whether previous information specifies different tile
if (tileset && tileset->tiles != newTileset->tiles) {
// Tile URLs changed: force tiles to be reloaded.
invalidateTiles();
// Tile size changed: We need to recalculate the tiles we need to load because we
// might have to load tiles for a different zoom level
// This is done automatically when we trigger the onSourceLoaded observer below.
// Min/Max zoom changed: We need to recalculate what tiles to load, if we have tiles
// loaded that are outside the new zoom range
// This is done automatically when we trigger the onSourceLoaded observer below.
// Attribution changed: We need to notify the embedding application that this
// changed. See https://github.com/mapbox/mapbox-gl-native/issues/2723
// This is not yet implemented.
// Center/bounds changed: We're not using these values currently
}
tileset = std::move(newTileset);
loaded = true;
observer->onSourceLoaded(*this);
}
});
}
} // namespace style
} // namespace mbgl
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