Returns an option that causes an operation to succeed only if the target blob does not exist.
This option can not be provided together with #generationMatch(long) or #generationNotMatch(long).
Returns an option for blob's data generation match. If this option is used the request will
fail if generation does not match the provided value. This option can not be provided
together with #generationNotMatch(long) or #doesNotExist().
Returns an option for blob's data generation mismatch. If this option is used the request
will fail if blob's generation matches the provided value. This option can not be provided
together with #generationMatch(long) or #doesNotExist().
Returns an option for blob's metageneration match. If this option is used the request will
fail if metageneration does not match the provided value. This option can not be provided
together with #metagenerationNotMatch(long).
Returns an option for blob's metageneration mismatch. If this option is used the request will
fail if metageneration matches the provided value. This option can not be provided together
with #metagenerationMatch(long).