def get_metadata(media_id, key):
"""Return the value associated with the given metadata `key` for the given
`media_id`, None if there is no such value.
get_metadata(string, string) -> object or None
"""
if media_id in __tp_dynamic:
tp = __tp_dynamic[media_id]
if key == 'filext': return tp.filext
elif key == 'tilesize': return tp.tilesize
elif key == 'aspect_ratio': return tp.aspect_ratio
else: return None
else:
return TileStore.get_metadata(media_id, key)
def _load(self, tile_id):
media_id, tilelevel, row, col = tile_id
maxtilelevel = TileStore.get_metadata(media_id, 'maxtilelevel')
if tilelevel > maxtilelevel:
return None
filename = TileStore.get_tile_path(tile_id)
try:
tile = Image.open(filename)
tile.load()
return tile
except IOError:
return None