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List:       tapestry-user
Subject:    Re: Using java 1.5 enums as property selection models
From:       Stephanos Piperoglou <stephanos.piperoglou () db ! com>
Date:       2006-10-31 11:26:41
Message-ID: OF95C35EDA.31076AA0-ON80257218.003D3D9A-80257218.003EDE55 () db ! com
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"Martin Strand" <martin.strand@entcap.se> wrote on 30/10/2006 17:33:32:

> On Mon, 30 Oct 2006 18:24:27 +0100, Stephanos Piperoglou <stephanos.
> piperoglou@db.com> wrote:
> 
> > I was kind of expecting to be able to use a generic type (T
> > above) as an instance of java.lang.Class. Unsurprisingly, I can't.
> > Surprisingly, I can't find a way to work around it!
> 
> Afaik, the type info isn't available at runtime for generic classes 
> so it can't be done.

You're absolutely right; I was forgetting that generics in 1.5 are nothing 
but glorified syntactic sugar; the compiler does the type checking and 
then throws it all away. You need the class in the constructor for runtime 
availability.

On the other hand, I'm still miffed that I have to use 
java.lang.Class.getEnumConstants() (which I had to dig through the API to 
find, and seems a bit inelegant even though the generic definition for the 
class guarantees type safety) when all the tutorials mention the 
<EnumType>.values() static method, which is defined for every subtype of 
java.lang.Enum but not Enum itself! Of course it's because you can't have 
abstract static methods in Java anyway... it just looks a bit ugly

Still, why am I complaining? It's a hell of a lot better than public 
static final int CITY_NYC = 1... :)

Thanks for the timely response to the initial query and humoring my aside 
guys!

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