>> 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.
I'm not sure I understand how SOFTDEL differs from LDAP_MOD_DELETE. Do you mean that values listed in SOFTDEL will be deleted if they exist, or otherwise ignored? p.
