exists
Checks whether an archive exists.
Return
true
if so, false
otherwise.
Parameters
archive
the archive ID.
Throws
if the archive ID is out of bounds.
if an underlying I/O error occurs.
Checks whether a group exists.
Return
true
if both the group and archive exist, false
otherwise.
Parameters
archive
the archive ID.
group
the group ID.
Throws
if the archive or group ID is out of bounds.
if an underlying I/O error occurs.