topic Re: abap OO chain method call in Application Development and Automation Discussions

abap OO chain method call

Former Member — Tue, 19 Jun 2007 11:34:19 GMT

Hi Guys,

Is it possible to use such bolded statement in ABAP OO?

data: some_object type ref to dummy.

create object some_object.

some_object->get_another()->method_of_another_object().

Best regards,

Wojciech

Re: abap OO chain method call

uwe_schieferstein — Tue, 19 Jun 2007 13:16:34 GMT

Hello Wojciech

I use frequently the interface IF_RECA_MESSAGE_LIST as message handler for my classes. The interface is defines as instance attribute (e.g. MO_MSGLIST).

At the beginning of the CONSTRUCTOR method I instantiate this interface:

  me->mo_msglist = cf_reca_message_list=>create( ).

In order to collect SYST messages I use the following method:

  me->mo_msglist->add_symsg( id_detlevel = '1' ).

However, if your bolded statement implies that instance some_object instantiates another object instance and simultaneously calls one of its methods I do not think this is (yet) possible.

Regards

Uwe

Re: abap OO chain method call

Former Member — Tue, 19 Jun 2007 15:02:09 GMT

Hi,

I'm getting an reference in get_another to another object. This object already exists.

Regards,

Wojciech

Re: abap OO chain method call

uwe_schieferstein — Tue, 19 Jun 2007 20:24:42 GMT

Hello Wojciech

If I adjust my example to your logic then the coding would look like this:

" some_object->get_another() ==> cf_reca_message_list=>create( ) " returns instance

" method_of_another_object() ==> -add_symsg (of returned instance)

  cf_reca_message_list=>create( )->add_symsg( id_detlevel = '1' ).

Well, in this case I am convinced that is not possible.

Regards

Uwe

Re: abap OO chain method call

Former Member — Tue, 19 Jun 2007 21:05:06 GMT

I've checked it on two systems 6.4 and 7.0. On both application servers it's not possible to use more than one method in one statement. Access to internal reference is only available via public reference fields. Thank you for your involvement.

Best regards,

Wojciech