Re: [mdr-users] createExtent(String, RefObject, RefPackage[])

Pieter Van Gorp wrote:

>Hi all,
>I'm looking for some information on the method to create an extent
>that clusters an already existing extent:
>(i.e. http://www.netbeans.org/download/dev/javadoc/MdrAPIs/org/netbeans/api/mdr/MDRepository.html#createExtent(java.lang.String,%20javax.jmi.reflect.RefObject,%20javax.jmi.reflect.RefPackage[])
>)
>
>A short explanation of the array argument or some example code should do it.  
>
>I passed a one-size array containing a UML extent to it but the
>clustered UML extent of my tracing extent (see
>http://www.fots.ua.ac.be/motmot/docs/traceability-p3.php) remains
>empty.  
>
That's weird - it should work correctly. I.e. if package A clusters 
package B and you create instance of B, then if you pass this instance B 
into the createExtent() method to create extend A, the instance of B 
should be reused.

>I already found it a bit weird that I didn't have to specify
>in which package of the tracing extent the existing UML extent should
>be loaded.  Sure, in my case there's only one clustered UML extent but
>problems should arise as soon as there would be more... therefore I
>must be missing something...
>  
>
This is not weird. According to MOF semantics, if A and B both cluster 
C, then only one instance of C is created and shared by both A and B. 
Similarly, if an instance of C already exists and you are creating 
instance of A and B (or D which owns A and B), then the instance of C is 
reused for both.
Martin