[saga-rg] AlreadyExists

[sbrandt at cct.lsu.edu]

Quoting Andre Merzky <andre at merzky.net>:
> There is a single case where we can't remove it (well, I
> found that one only at least): opening a file with with the
> flags (Create | Excl).  That MUST raise an error, otherwise
> the flag would make no sense.

Yes, but if it really is the only place then maybe this is really a  
WriteError, or some subclass thereof.

BTW, are the names of these exceptions still debatable? Because having  
the name "Error" in a Java exception that is not a subclass of Error  
is awkward. It would be nicer if we could call it something else like  
"WriteException".

> As for mkdir, we tried to stay close to what users know from
> command line, and from POSIX/libc, which both return an
> error if the dir exists.

I think it depends. One could argue that if we want to mimic  
POSIX/libc then this should show up as a return code and not an  
exception. Posix does not force you to clutter your code with handling  
this case every time you call mkdir().

I could see throwing an exception of some sort if, at the conslusion  
of the call to mkdir(), the directory did not exist.

Cheers,
Steve