def approximate_size(self, ranges):
''' Given a collection of ranges, return the approximate
size of the database between those ranges.
:param ranges: dictionary or list of tuple ranges
:returns: The size of the database between those ranges
'''
if isinstance(ranges, dict):
ranges = ranges.items()
collection = RangeCollection.create(ranges)
LDB.leveldb_approximate_sizes(self.database, collection.count,
collection.start_keys, collection.start_sizes,
collection.end_keys, collection.end_sizes, collection.sizes)
return list(collection.sizes)
