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From Jörn Kottmann <kottm...@gmail.com>
Subject Re: generics: FSIndexRepository
Date Thu, 13 Aug 2009 11:27:02 GMT
Thilo Goetz wrote:
> Jörn Kottmann wrote:
>   
>> Jörn Kottmann wrote:
>>     
>>> Jörn Kottmann wrote:
>>>       
>>>> Jörn Kottmann wrote:
>>>>         
>>>>> Hi,
>>>>>
>>>>> after all the discussion we had I think thats the correct
>>>>> way to generify FSIndexRepository:
>>>>>
>>>>> interface FSIndexRepository {
>>>>> FSIndex<FeatureStructure> getIndex(String label);
>>>>> FSIterator<FeatureStructure> getAllIndexedFS(Type aType);
>>>>> ...
>>>>> }
>>>>>           
>>>> It generified now and also getIndexes:
>>>> Iterator<FSIndex<FeatureStructure>> getIndexes();
>>>>         
>>> Stupid question, but how can a FSIndex<FeatureStructure> be converted
>>> into a FSIndex<AnnotationFS> ?  Since casting directy is not possible,
>>> do I need to write some kind of adapter which does the casting for me ?
>>>       
>> FSIndex<FeatureStruture> indexFS
>> FSIndex<AnnotationFS> indexAnnotationFS = (FSIndex<AnnotationFS>)
>> (Object) indexFS;
>>
>> Could it be done like this ?
>>
>> Jörn
>>     
>
> Yes, and it's an excellent example of how screwed up Java
> generics are.  BTW, I recommend whatever Angelika Langer
> has to say on the topic:
> http://www.angelikalanger.com/Articles/Topics.html#JAVA
> Some of it is only available in German, but she has English
> translations for most of her articles.  She calls this a
> "double-fisted cast".
>   
Could not find the part where she talks about double fisted casts
and googling for it was not successful also.

Do you have a link ?

Jörn

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