Drew - you must have misunderstood what I wanted to do with OGNL. I merely want to
offer it as an
optional expression language for the displaytag - I *don't* want to replace the
existing expression
evaluator or JSTL's EL. ;-)
So what Fabrizio is saying sounds great to me - a way to configure the displaytag to
use both. As an
initial thought-provoking activity - I suggest we allow users to configure it the
following way:
1. By URI - adding "/el" to the end of the URI indicates that the user wants to use
the EL-enabled
library. This is how Struts does it and it seems to work pretty well. The main
difference is they
distribute 2 jars - one that is struts-el.jar. I like the 2 TLDs and one JAR approach
we're doing -
especially since the current JSTL implementation is only 3 classes.
2. To use JSTL's EL, simply wrap your value with property="${...}" and for OGNL use
property="ognl:...". Isn't this how WebWork does it - with the "ognl:" prefix? I'd
like to use
something that is familiar to OGNL users (Tapestry and WW users). Another option
might be to use
property="[...]" - but the closeness in syntax might be confusing to users.
Thoughts?
Fabrizio - I just tried to build the latest JAR (with your EL modifications), but had
no luck. I'm on OS
X with JDK 1.4.2/Maven 1.0 RC1 and I get the following error:
Attempting to download tools-1.3.jar.
WARNING: Failed to download tools-1.3.jar.
The build cannot continue because of the following unsatisfied dependency:
tools-1.3.jar (try downloading from http://java.sun.com/j2se/1.4.2/download.html)
I'll try it on my Windows box when I get home later tonight.
Thanks,
Matt
> Well, my plans are to have a pluggable, user-configurable,
> expression evaluator.
>
> In this way we can include an "old style" displaytag evaluator, an
> EL evaluator and, in future, maybe an OGNL evalutor. Users should be
> able to choose it in the properties file or to implement a custom evaluator...
>
> AFTER 1.0
>
> fabrizio
>
>
> From: Drew Davidson
> Sent: Thu 11/03/2004 0.25
> To: [EMAIL PROTECTED]
> Subject: Re: [displaytag-devel] EL tags
>
> Fabrizio Giustina wrote:
>
> > [deleted]
> >
> > I'm going to definitively kill this in the EL version of table tag...
> > This means that the el tag will never work in replacement of the
> > standard tag without at least replacing the sintax of the name
> > attribute (usually a couple of {} will be enough to fix it).
> > Since al EL version has never been released, neither in beta, this is
> > the right time to do it... I'm sorry for users who downloaded the
> > snapshot waiting for a release with a similar implementation, but
> > since I didn't see any comment on this absurd thing I'm pretty
> > confident most people will not care about it.
>
> Useful though it might be, I've been in contact with Matt Raible
> about using the OGNL expression and binding language
> (http://www.ognl.org) as a replacement for the expression language
> in displaytag instead of EL. OGNL supports extensions which make it
> a more robust EL than JSP EL.
>
> Do you have any thoughts on this?
>
> - Drew
>
> --
> +---------------------------------+
> < Drew Davidson | OGNL Technology >
> < Professional Open Source >
> +---------------------------------+
> | Email: [EMAIL PROTECTED] /
> | Web: http://www.ognl.org /
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> | Fax: (520) 531-1965 \
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