readMapDataSingle method
Reads data for tile.
@param tile tile for which data is requested. @return map data for the tile.
Implementation
@override
Future<DatastoreReadResult?> readMapDataSingle(Tile tile) async {
switch (this.dataPolicy) {
case DataPolicy.RETURN_FIRST:
Projection projection =
MercatorProjection.fromZoomlevel(tile.zoomLevel);
for (MapDataStore mdb in mapDatabases) {
if (mdb.supportsTile(tile, projection)) {
return mdb.readMapDataSingle(tile);
}
}
return null;
case DataPolicy.RETURN_ALL:
return _readMapData(tile, false);
case DataPolicy.DEDUPLICATE:
return _readMapData(tile, true);
}
//throw new Exception("Invalid data policy for multi map database");
}