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> 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.
> Comments? Objections? p.
It might be a good idea to have a SOFTDEL as well; both are useful for declarative modifications of data. Think of them in terms of:
Soft Add: The attribute shall contain at least these values, but might have others
Soft Del: The attribute shall contain none of these values, but might have others
Ideally as modify sub-operations.