ABAP_to_the_Future

Using BOPF to Write a DYNPRO-Style Program 8.2
ELSE.
cs_monster_header-hat_size_description = 'NORMAL HAT'.
ENDIF.
* Fill the Sanity Description
IF cs_monster_header-sanity > 75.
cs_monster_header-sanity_description = 'VERY SANE'.
ELSEIF cs_monster_header-sanity > 50.
cs_monster_header-sanity_description = 'SANE'.
ELSEIF cs_monster_header-sanity > 25.
cs_monster_header-sanity_description = 'SLIGHTLY MAD'.
ELSEIF cs_monster_header-sanity > 12.
cs_monster_header-sanity_description = 'VERY MAD'.
ELSEIF cs_monster_header-sanity > 1.
cs_monster_header-sanity_description = 'BONKERS'.
ELSE.
cs_monster_header-sanity_description = 'RENAMES SAP PRODUCTS'.
ENDIF.
ENDMETHOD. "Fill Header Derived Fields
Listing 8.8 Filling Derived Header Fields
The code in Listing 8.8 to fill the derived fields is deliberately simple. In real life,
you would perform some text lookups to get the sales organization description
based on the sales organization code or some such, or you would multiply two
fields together to get a third. (The exampl e is also unrealistic in that in the real
world surely nobody would be mad enough to rename their entire product portfolio
every month.)
Now, you have the business logic code; ne xt, you’ll learn how you can tell the
BOPF determination class to make use of this logic. As mentioned previously, this
involves the implementation of three methods: CHECK_DELTA, CHECK, and EXECUTE.
The CHECK_DELTA Method
I started off programming in 1981 on a computer with 1K of memory and a processor
with a tiny fraction of the processing power we are used to today. The
restrictions this forced upon me have stayed with me all my life, and even to this
day I am obsessed with not executing a single line of code that does not need to
be run (in order to put less strain on the CPU). In this example, you can reduce the
number of lines of code that run in this way: Instead of redetermining the hat size
text every time a user changes anything, only run the code when the hat size value
changes. This is somewhat analogous to ON INPUT in the DYNPRO framework.
311