ABAP_to_the_Future

Coding the INIT and END Methods 5.3
P_TEXT =
* p_problem_class =
.
* CATCH cx_tpda_application_log .
*ENDTRY.
Listing 5.5 Free Text
An application log object has to be created in order to have messages added to it
and to output the results. In the example in Section 5.3, you will see how to create
your application log in the INIT method and display it to yourself in the END
method.
Using Z Classes in the SCRIPT Method
The Script Wizard contains a large number of useful classes that can do almost anything
you can think of when it comes to controlling the debugger. However, you are bound to
reach a situation in which you need to do something that is not covered. When that day
comes, it’s no problem—because you’re in a normal ABAP method, so you can use your
own classes.
Say you want to save the application log to the database. The standard CL_TPDA_
SCRIPT_MESSAGES does not give you that option, so instead of using the wizard you just
use methods of a class that does have th at option, perhaps one that implements IF_
RECA_MESSAGE_LIST. You usually cannot create a subclass of standard SAP classes, like
CL_TPDA_SCRIPT_MESSAGES, because 99.99% of the time standard SAP classes are set
to final. Therefore, creating your own Z classes with the same method interfaces is the
way to go most of the time.
5.3 Coding the INIT and END Methods
To further illustrate the process of writing a debugger script, look at another
example, this time on e that involves the INIT and END methods as well as the
SCRIPT method. You have a program in which a monster counts to 10, and every
time the monster gets to a number that is divisible by three he has to say “Ha ha
ha.” Every time he gets to a number that is divisible by five, lightning flashes. The
end users are complaining that there is not enough laughing and lightning.
Sounds familiar, right? You probably get almost the exact same situation in your
day-to-day work all the time.
The example program can be seen in List ing 5.6. Right away, you will spot the
error, which is that the program uses the command DIV instead of MOD: tut, tut, tut.
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