code: public void ensureValidity(long oid) {
  		if (oids == null) {
  			return;
  		}
  		if (oid >= oids[oids.length-1]) {
  			nextValidOidPos = -1;
  			return;
  		}
  		while (oid >= oids[nextValidOidPos]) {
  			nextValidOidPos++;
  		}
  	}
docs: This needs to be called when users provide their own OIDs. The OID buffer needs to ensure
  that it will never return an OID that has been previously used by a user.
  @param oid OID to check