Re: [TM4J-users] Casting TMAPI - TM4J Topic Problem

[Lars H. <he...@se...>]

Hi Darina,

[...]
>                         Collection vc = bn.getVariants();
>                         Iterator it = vc.iterator();
>                         while (it.hasNext()) {
>                                 Variant var = (Variant) it.next();
>                                 Iterator  si =
> var.getScope().iterator();      
>                                 if (si.hasNext()){
>                                         Topic param = (Topic)si.next();
> //***Exception Here****

> I get: JavaLangClassCastException:
> Org.TM4J.TopicMap.Memory.TopicMapImpl

Are you sure that your "Variant" is a "org.tmapi.core.Variant" and not
a "org.tm4j.topicmap.Variant"? I've the suspicion that you mix up the
classes from TM4J and TMAPI by mistake.

The name bound to "bn" must be an instance of type
"org.tmapi.core.TopicName". If it is an instance of
"org.tm4j.topicmap.BaseName", your iterator returns variants of type
"org.tm4j.topicmap.Variant" and these instances return objects of type
"org.tm4j.topicmap.Topic" if you call "getScope()".

Please check if you're working with the TMAPI interfaces only.

If you need to work with TM4J interfaces *and* TMAPI interfaces, the
class "org.tm4j.tmapi.helpers.Wrapper" may help you to 'wrap' and
'unwrap' objects into both directions.

Best regards,
Lars
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