[no subject]

I'm trying to immerse myself into the RPG/Java interface.

 

I'm trying to use an example from the ILE RPG Programmer's Guide as a
vehicle for flexing some code to understand how this functionality is
implemented.

 

On page 165 of the above manual is some example code (P165 Figure 77)
depicting a simple interface to the trim method of the java.lang.String
class.

 

I could not get the original version to compile until I added the class
keyword to the trimString prototype. The compiler was giving me the
following message:

 

RNF3951 30     26 002600  The CLASS keyword is required with datatype O.


 

The code in bold/italics (between lines 28-29) below is what I added and
got the program to compile - and run. 

 

Did I do the right thing? Should the manual be updated?

 

I can't understand why the class declaration is required as a separate
keyword as it is already defined as one of the method parameters anyway.
Is there a reason that the two might ever be different?

 

 

 1  *


 2  * Define field for string object


 3  *
------------------------------------------------------------------------
----------------    

 4 d str             s               o   class(*JAVA :
'java.lang.string')                            

 5  *


 6  * Prototype the constructor.


 7  * Constructor expects a byte array.


 8  *
------------------------------------------------------------------------
----------------    

 9 d makestring      PR              o   extproc( *JAVA


10 d                                             : 'java.lang.String'


11 d                                             : *CONSTRUCTOR)


12 d                                     class( *java


13 d                                          : 'java.lang.String')


14 d parm                          10A


15  *


16  * Prototype the string method getBytes which converts a string to a
byte array.                   

17  * we can then store the byte array in an alpha field.


18  *
------------------------------------------------------------------------
----------------    

19 d getBytes        PR            10A   EXTPROC( *JAVA   

20 d                                            : 'java.lang.String'


21 d                                           : 'getBytes') VARYING


22  *


23  * Prototype the string method trim. It doesn't take any parameters,
but since it is not a           

24  * static method, it must be called using a string object.


25  *
------------------------------------------------------------------------
---------------      

26 d trimString      PR              O   EXTPROC( *JAVA


27 d                                            : 'java.lang.String'


28 d                                            : 'trim')

   d                                     class( *java


   d                                          : 'java.lang.String')


29  *


30 d fld             S             10A   INZ('   hello  ') VARYING


31  *


32 c                   eval      str= makestring(fld)


33  *


34  * Trim the string.


35  *
------------------------------------------------------------------------
---------------      

36 c                   eval      str= trimstring(str)


37  *                                                               

38  * Convert the string back into a byte array & store it in fld.


39  *
------------------------------------------------------------------------
---------------         

40 c                   eval      fld= getBytes(str)


41  *


42 c                   seton
lr----   

 

Thanks again.


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