Shawn Bayern wrote:
> On Mon, 18 Mar 2002, Dave Newton wrote:
>
>
>>On Monday 18 March 2002 02:43 pm, you wrote:
>>
>>>><c:if test="${securityBean.check(request, response) }">
>>>>
>>>The JSTL expression language does not support method invocations on
>>>objects. You'll currently need to use a custom tag library or scriptlet
>>>code (with the former being recommended over the latter) if you want to
>>>access arbitrary methods and pass arguments to them.
>>>
>>So, from a non-current tag/etc. user does this mean that I'd either
>>want a custom tag for All Things Like That (i.e., <c:ifsecurecheck
>>...>) or, perhaps more OOish, <c:ifcheck param=MyBean> and use
>>reflection to call a common method for everything I'd ever want to
>>.check?
>>
>
> Tags are a great mechanism for providing abstraction. If you want a
> facility to call arbitrary methods from within a JSP page, Java scriptlets
> (<% %>) provide this already. Scriplets' problems don't just stem from
> their syntax; they tend to make pages harder to maintain because they
> don't create any meaningful abstraction.
>
> Tags do. When you design tags, I simply recommend you choose the most
> convenient abstraction for your users.
>
> There's a theory in linguistic pragmatics (for actual human languages, not
> CS languages) that suggests language is a tradeoff between laziness and
> effectiveness; as a speaker, you want to be lazy, but as a listener, you
> want the speaker to provide as much information as is necessary. Since
> everyone is both a speaker and a listener, languages end up being
> balanced: not too verbose or too clipped, on average.
>
> Anyway, page authors and tag-library developers are in a similar
> relationship. For every environment, there's a particular level of
> "verbosity" that's appropriate; one isn't necessarily better than others.
> JSTL works well with either approach; it encourages good design when
> unambiguous, but otherwise tries to avoid preaching about how you must
> design your applications.
>
> --
> Shawn Bayern
> Author, "JSP Standard Tag Library" http://www.jstlbook.com
> (coming this summer from Manning Publications)
>
>
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