topic Re: Null Object Reference in Application Development and Automation Discussions

Null Object Reference

Former Member — Mon, 19 Jun 2006 11:22:23 GMT

Hi!

Is there any expression in ABAP Objects like e.g. the "null" object reference in java?

I mean, a null-reference, that is compatible to all other objects and can be used e.g. in method calls?!

I couldn't find anything, though I'd strongly expect it.

Thx

Nick

Re: Null Object Reference

athavanraja — Mon, 19 Jun 2006 11:31:14 GMT

Welcome to SDN.

I am not sure i understood your question completely.

the equivalent of NULL in abap environment is initial.

for example to check whether a class instance is intantiated or not we do

if <class var> is not INITIAL.

Is this what you are looking for?

Regards

Raja

Re: Null Object Reference

Former Member — Mon, 19 Jun 2006 11:32:35 GMT

Just check it out.

var = ''.

I think it will make the var as null value. var can be of any type.

Rgds,

TM.

Re: Null Object Reference

Former Member — Mon, 19 Jun 2006 11:54:33 GMT

Hi, thanks for your answer, but it's not really, what I wanted to know. Here is a short code snipplet:

data: sp type ref to if_srm_poid,

po type ref to if_srm_poid,

uo type ref to object.

mycopypastedata->set(

src_poid = sp

poid = po

text = ''

icon_id = ''

user_object = uo ).

And that's what I like to have:

mycopypastedata->set(

src_poid = NULL

poid = NULL

text = ''

icon_id = ''

user_object = NULL ).

Maybe it's clearer, now. '', space, initial or other things do not work (of course!).

Nick

Re: Null Object Reference

athavanraja — Mon, 19 Jun 2006 12:16:33 GMT

data: sp type ref to if_srm_poid,

po type ref to if_srm_poid,

uo type ref to object.

mycopypastedata->set(

src_poid = sp

poid = po

text = ''

icon_id = ''

user_object = uo ).

now within the set method you have to check whether

sp is initial or not.

if you dont want to pass null then

sp = l_xml->find_node(

name = 'CARRID'

ROOT = ROOT

then pass sp to the set method

Regards

Raja