Re: Add-if-not-present

[Howard Chu <hyc@symas.com>]

masarati@aero.polimi.it wrote:
> I need to implement a modify operation whose semantics is "add if not
> present", an add that only takes place if that attribute is not yet
> present in the entry.
>
> I need it as an internal operation, so right now I wouldn't bother
> formalizing it as an extension of the semantics of the modify operation.
> Something like the SLAP_MOD_SOFTADD, which in turn consists in adding an
> attribute value only if that value is not already present.
>
> I'd introduce a SLAP_MOD_ADD_IF_NOT_PRESENT flag and add code to support
> it in all (well, most) backends/overlays that need to muck with modify
> operation type.

Sounds like you could do it with an Assertion Control (!(attr=*)).

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/