topic Dynamic table as parameter - checking type in Application Development and Automation Discussions

Dynamic table as parameter - checking type

emil_lazarski — Wed, 20 May 2020 15:37:46 GMT

Hi,

I recently came across an interesting mind-boggling issue.

Let's assume, we have a method that as one of the parameters has a table type TABLE.

During the runtime, one can check the type of the Table passed to the method in a pretty straightforward way.

DATA(typedescr) = cl_abap_typedescr=>describe_by_data( it_table ).
DATA(outtype) = typedescr->absolute_name.

As a result we have the absolute type of it_table which is fine.

However, how can we check if the input table is of type f.ex. lty_ztype.

        TYPES: BEGIN OF lty_ztype ,
                    first TYPE CHAR12
        TYPES END OF lty_ztype.

In case of the classes and objects we have keywords IS INSTANCE OF.
The above case can happen if we have a generic method used to process different table types in specific ways.

How can we handle such case?

Thanks!

Re: Dynamic table as parameter - checking type

matt — Wed, 20 May 2020 16:20:25 GMT

Not on a system at the moment but wouldn't something like this work?

CREATE DATA line_of_table LIKE LINE OF it_table.
ASSIGN line_of_table TO FIELD-SYMBOL(<line>).

DATA(typedescr) = cl_abap_typedescr=>describe_by_data( <line> ).

But I do feel that there is a way directly from DATA(typedescr) = cl_abap_typedescr=>describe_by_data( it_table )

Re: Dynamic table as parameter - checking type

emil_lazarski — Wed, 20 May 2020 16:21:20 GMT

After some debugging I found a way:

DATA table_d type ref to cl_abap_tabledescr.
        table_d ?= CL_ABAP_TYPEDESCR=>describe_by_data( it_user_list ).
        DATA(line_descr) = table_d->get_table_line_type( ).

it is in ABSOLUTE_NAME (\TYPE = ...)

Re: Dynamic table as parameter - checking type

Sandra_Rossi — Wed, 20 May 2020 17:09:16 GMT

or in method GET_RELATIVE_NAME( ).