allows to exclicitly free resources and break cyclic references.
Actually the real lifetime of an UNO object is controlled by
references kept on interfaces of this object. But there are two
distinct meanings in keeping a reference to an interface:
1st to own the object and 2nd to know the object.
You are only allowed to keep references of interfaces
to UNO objects if you are by definition the owner of that object or
your reference is very temporary or you have registered an
EventListener at that object and release the reference when
"disposing" is called.
The owner of an object calls this method to explicitly free all
resources kept by this object and thus break cyclic references.
Only the owner of this object is allowed to call this method.
The object should release all resources and references in the
easiest possible manner ( for instance no serialization should
take place anymore ).
The object must notify all registered listeners using the method
XEventListener::disposing. All notfied objects
should release there references to this object without
calling XComponent::removeEventListener
(the disposed object will release the listeners eitherway).
After this method has been called, the object should behave as passive
as possible, thus it should ignore all calls
in case it can comply with its specification (for instance addEventListener()).
Often the object can't fulfill its specification anymore,
in this case it must throw the DisposedException
(which is derived from ::com::sun::star::uno::RuntimeException)
when it gets called.
For some objects no real owner can be identified, thus it can be
disposed from multiple reference holders. In this case
the object should be able to cope with multiple dispose()-calls (which
are inevitable in a multithreaded environment).
