RE: Prototyping a constructor of java String class

["Steffan, Otto \(GE Consumer Finance\)" <Otto.Steffan@xxxxxx>]

Hello Michael,

I checked JNI copybook Your code snippet comes from. I dare say that I would 
have to provide char data in UCS-2 or some code page that is native for Java, 
whenever calling this JNI method; it is a significant drawback for me. I think 
RPG compiler handles conversion from EBCDIC for me if I use a prototype.

Otto Steffan

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]On 
Behalf Of Rooney, Michael P
Sent: Tuesday, June 01, 2004 3:31 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Prototyping a constructor of java String class



I'm not sure exactly what Java function the compiler "encapsulates" when
constructing strings but it is posisble in utilzies the JNI "NewString"
function.  This would enable the compiler to construct the string based
on the RPG prototype.

The prototype for NewString looks like the following:

D*--------------------------------------------------------------------- 
D*      jstring (*NewString)                                            
D*        (JNIEnv *env, const jchar *unicode, jsize len);               
D*--------------------------------------------------------------------- 
D NewString       PR                  LIKE(jstring)                     
D                                     EXTPROC(*CWIDEN                   
D                                     : JNINativeInterface.             
D                                       NewString_P)                    
D env                                 LIKE(JNIEnv_P) VALUE              
D unicode                             LIKE(jchar) CONST                 
D len                                 LIKE(jsize) VALUE

While it is entirely conceivable that the compiler generates the required
code to "trim" your string dynamically, you could also use BIF's to determine
your exact requirements THEN use JNI to construct your string.  It is the
"long way" around but probably addresses your storage concerns.

Michael Rooney
Citigroup International