'Yields client_files for the specified file store hash.
Args:
hash_obj: RDFURN that we want to get hits for.
token: Security token.
age: AFF4 age specification. Only get hits corresponding to the given
age spec. Should be aff4.NEWEST_TIME or a time range given as a
tuple (start, end) in microseconds since Jan 1st, 1970. If just
a microseconds value is given it\'s treated as the higher end of the
range, i.e. (0, age). See aff4.FACTORY.ParseAgeSpecification for
details.
Yields:
RDFURNs corresponding to a client file that has the hash.
Raises:
ValueError: if age was set to aff4.ALL_TIMES.'

@classmethod
def GetClientsForHash(cls, hash_obj, token=None, age=aff4.NEWEST_TIME):

    if (age == aff4.ALL_TIMES):
        raise ValueError('age==aff4.ALL_TIMES    is    not    supported.')
    results = cls.GetClientsForHashes([hash_obj], token=token, age=age)
    for (_, client_files) in results:
        for client_file in client_files:
            (yield client_file)
