BonoboMonikerExtender
A way to extend arbitary monikers
A moniker extender is used to extend the functionality of a moniker.
There are two standard moniker extenders that cannot be system wide,
since they use the oaf database to expand the scope of a moniker to
arbitrarily many interfaces. These are invoked explicitely by monikers
implementing the stream interface in the following way:
Explicit Stream extender usage example
Bonobo_Unknown
example_moniker_resolve (BonoboMoniker *moniker,
const Bonobo_ResolveOptions *options,
const CORBA_char *requested_interface,
CORBA_Environment *ev)
{
if (!strcmp (requested_interface, "IDL:Bonobo/Stream:1.0"))
return handle_stream (moniker, options, ev);
else
return bonobo_moniker_use_extender (
"OAFIID:Bonobo_MonikerExtender_stream",
moniker, options, requested_interface, ev);
}
The moniker extender essentialy resolves 'moniker' against stream
and by some means ( not known when the moniker was written ) converts
this to a new exotic interface - via. the PersistStream interface.
All standard moniker extenders are registered by adding a fragment
like this:
Oaf information for an extender
<oaf_attribute name="bonobo:moniker_extender" type="stringv">
<item value="file:"/>
</oaf_attribute>
to the .oaf file. This registers the extender with the system, such
that when a moniker resolve fails an extender can be found for any
of the monikers with prefix specified in the "bonobo:moniker_extender"
stringv.
Implementing your own extender is extremely simple, much like
#BonoboMonikerSimple.
Oaf information for an extender
Bonobo_Unknown
example_extender_resolve (BonoboMonikerExtender *extender,
const Bonobo_Moniker m,
const Bonobo_ResolveOptions *options,
const CORBA_char *display_name,
const CORBA_char *requested_interface,
CORBA_Environment *ev)
{
... resolve 'm' against an interface we know it supports ...
... then use that interface to provide requested_interface ...
}
It is registered again in much the same way in your factory:
Creating a new simple moniker
static BonoboObject *
bonobo_std_moniker_factory (BonoboGenericFactory *this,
const char *object_id,
void *data)
{
g_return_val_if_fail (object_id != NULL, NULL);
if (!strcmp (object_id, "OAFIID:Bonobo_MonikerExtender_file"))
return BONOBO_OBJECT (bonobo_moniker_extender_new (
example_extender_resolve, NULL));
else
return NULL;
}
Implements a moniker extender: Bonobo::MonikerExtender.
BonoboMonikerExtender's class.
@parent_class:
@epv:
@resolve:
Moniker resolution callback function.
@extender: extender (self)
@parent: parent moniker
@options: resolve options
@display_name: ? FIXME
@requested_interface: ? FIXME
@ev:
@Returns: the resolution resulting object
@resolve:
@data:
@Returns:
@name:
@interface:
@opt_ev:
@Returns:
@extender_oafiid:
@moniker:
@options:
@requested_interface:
@opt_ev:
@Returns: