Using Sets with JSTL

[Patrick Burleson <ta...@patrickburleson.com>]

Hello all,
 First off, is there an archive of this mailing list that can be searched?
 
Now, my question: How can you work with Sets in JSTL? It appears most of 
the other Collections API objects are supported, but not Sets. The 
reason I ask is I have a page that gets a List of data that I want to 
iterate over (very easy with JSTL's forEach), but I want to check a Set 
to see if it contains the current element so I can do something a little 
bit different. To get this working, I had to switch to using Java code 
in the JSP. It seems like this would be a common problem to solve. And I 
don't think I should have to write some sort of wrapper class to achieve 
this with a base Collections API class as that seems more clumsy than 
having Java code in the JSP.

Thanks,
Patrick
 



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Re: Using Sets with JSTL

[Patrick Burleson <ta...@patrickburleson.com>]

Kris Schneider wrote:

>One possibility: http://marc.theaimsgroup.com/?l=taglibs-user
>
>  
>
Thanks

>I'm not sure why it's not included, or if it was even considered, but here's a
>guess. While Collection, and hence List and Set, supports "contains", Map does
>not. Instead, Map supports "containsKey" and "containsValue". So, what would you
>provide for tags? 
>
But don't Maps support the [$key] notion of looking up values?? Why not 
something similar for Sets?

>This may be a case where developing your own taglib would be
>appropriate. Or, maybe what you're doing is better suited to a servlet or
>component of an MVC/Model 2 framework. In other words, do more data processing
>before forwarding to the JSP.
>
>  
>
I had not considered this. But I could do that with my current MVC. I 
could just pass a list of the values as they should be displayed.

Thanks,
Patrick




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Re: Using Sets with JSTL

[Kris Schneider <kr...@dotech.com>]

Quoting Patrick Burleson <ta...@patrickburleson.com>:

> Hello all,
>  First off, is there an archive of this mailing list that can be searched?

One possibility: http://marc.theaimsgroup.com/?l=taglibs-user

> Now, my question: How can you work with Sets in JSTL? It appears most of 
> the other Collections API objects are supported, but not Sets. The 
> reason I ask is I have a page that gets a List of data that I want to 
> iterate over (very easy with JSTL's forEach), but I want to check a Set 
> to see if it contains the current element so I can do something a little 
> bit different. To get this working, I had to switch to using Java code 
> in the JSP. It seems like this would be a common problem to solve. And I 
> don't think I should have to write some sort of wrapper class to achieve 
> this with a base Collections API class as that seems more clumsy than 
> having Java code in the JSP.

I'm not sure why it's not included, or if it was even considered, but here's a
guess. While Collection, and hence List and Set, supports "contains", Map does
not. Instead, Map supports "containsKey" and "containsValue". So, what would you
provide for tags? This may be a case where developing your own taglib would be
appropriate. Or, maybe what you're doing is better suited to a servlet or
component of an MVC/Model 2 framework. In other words, do more data processing
before forwarding to the JSP.

> Thanks,
> Patrick

-- 
Kris Schneider <ma...@dotech.com>
D.O.Tech       <http://www.dotech.com/>

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