Casting java objects in RPG - problem solved

["Larry Ducie" <larry_ducie@xxxxxxxxxxx>]

Hi everybody,

I have solved my casting problem - the casting is implied by the prototypes 
used.

It would appear that the casting is done by the RPG - Java interface during 
the mrethod call. My problem was that I was using my StrteamSource object as 
a parameter to a method requiring a Source object. To enable the casting to 
take place I needed to specify the parameter as a Source object in the 
method's RPG prototype.

Thus, I pass a StreamSource object using a Source parameter definition. As 
the StreamSource object is of type Source, the casting takes place and all 
is OK:

* transform( StreamSource, StreamResult )...
D transform       pr                  EXTPROC(*JAVA
D                                     :'javax.xml.transform-
D                                     .Transformer'
D                                     :'transform')
D Source                          O   Class(*JAVA
D                                     :'javax.xml.transform-
D                                     .Source')
D Result                          O   Class(*JAVA
D                                     :'javax.xml.transform-
D                                     .Result')

Although the prototype definition requires a Source and Result object, I 
actually pass a StreamSource and StreamResult object.

Or Am I correct..? It it really a case that the RPG program actually has an 
"object" reference and the "object" is always passed. It is up to the java 
runtime to check whether there is a type mismatch?

Cheers

Larry Ducie