RE: [Springframework-developer] RE: Tags using expression language?? & Petclinic

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Ok, I can implement it all, no problem, however, I've got to do it in my =
spare time, which means in the evenings, because I have to do some other =
things this week as well...

So it'll probably finished by Thursday evening... If that's alright with =
you?

Cheers,

Alef

-----Oorspronkelijk bericht-----
Van: spr...@li... =
[mailto:spr...@li...] Namens =
Alef Arendsen (JTeam)
Verzonden: Sunday, July 13, 2003 7:27 PM
Aan: 'Ken Krebs'; 'j=C3=BCrgen h=C3=B6ller [werk3AT]'
CC: spr...@li...
Onderwerp: [Springframework-developer] RE: Tags using expression =
language?? & Petclinic

I'm currently checking out the sourcecode. Somehow I wasn't able to =
during the last couple of days. Well, anyway, I'll have a look into it =
and I'll let you know tomorrow...

Cheers,

Alef

-----Oorspronkelijk bericht-----
Van: Ken Krebs [mailto:kk...@kk...]
Verzonden: Saturday, July 12, 2003 6:22 PM
Aan: j=C3=BCrgen h=C3=B6ller [werk3AT]; al...@jt...
CC: spr...@li...
Onderwerp: Tags using expression language?? & Petclinic

Eliminating repetitive code in the jsp's is something I'd very much like =

to see. Alef: thanks for your contribution, it looks like it will help.

I've been in the process lately of  refactoring Petclinic's Clinic=20
implementation along with code tightening and documentation improvements =

and am just about ready to commit the changes. I WILL commit these=20
changes sometime later today. A couple of jsp's have minor changes.

Alef: If you would like to make the changes to the jsp's, please go=20
ahead. If not, I'll do it. Please let me know if you will be doing it.

Regards,
Ken
=20
j=C3=BCrgen h=C3=B6ller [werk3AT] wrote:

>I've introduced support for EL on tag attributes yesterday, already
>committed. Thanks for the idea and the prototype, Alef! I hope you are =
satisfied with the integration. You're very welcome to try it out :-)
>=20
>There's a new ExpressionEvaluationsUtils class now in
>com.interface21.web.util, taking a String argument value and parsing it =
to Object, String, int, or boolean. It will just attempt EL evaluation =
if the value starts with "${", else it will simply parse the value with =
standard means.
>=20
>All of Spring's tags use this class now for all attributes, simply
>delegating to the respective ExpressionEvaluationsUtils method in each =
setter. This means that all attributes still accept normal String values =
as before (like <i21:bind path=3D"person.name">), but also EL =
expressions (like <i21:bind path=3D"${bindPath}">).
>=20
>For EL evaluation, ExpressionEvaluationsUtils depends on Jakarta's JSTL
>implementation (standard.jar). It doesn't have a runtime dependency if =
just parsing normal String values though, as it delegates EL evaluation =
to an inner class that will just get loaded in case of actual EL =
expressions. So you'll just need the Jakarta JSTL implementation in your =
classpath if you actually use EL attribute values on tags.
>=20
>BTW, our AopProxy uses a similar mechanism to avoid a runtime
>dependency on CGLIB. If just proxying interfaces, it will use standard =
J2SE proxies. Only if you try to proxy a class itself, it will invoke =
CGLIB by delegating to a respective inner class.
>=20
>Finally, we should adapt PetClinic to use EL expressions on its bind
>tags. Alef has already shown the way in the prototype that he sent. =
Ken, what do you think? Would you like Alef to do this?
>=20
>Juergen
>=20
>=20
>
>	-----Urspr=C3=BCngliche Nachricht-----=20
>	Von: j=C3=BCrgen h=C3=B6ller [werk3AT]=20
>	Gesendet: Fr 11.07.2003 08:13=20
>	An: al...@jt...; spr...@li...=20
>	Cc:=20
>	Betreff: Re: [Springframework-developer] Tags using expression
>language??
>=09
>=09
>
>	Alef,
>=09
>	I've just browsed your code - this looks very interesting! It makes
>iterating such repetitive form fields like in the petclinic much =
easier. I'll have a look at the implementation details, and if =
everything works out I'll add a clean room version to the main source =
tree promptly.
>=09
>	I wonder if we could make that work with any JSTL implementation, not
>just the Jakarta one, although I wouldn't mind a dependency on the =
latter for this feature.
>=09
>	Cool stuff :-)
>=09
>	Juergen
>=09
>=09
>=09
>	        -----Urspr=C3=BCngliche Nachricht-----
>	        Von: Alef Arendsen [mailto:al...@jt...]
>	        Gesendet: Di 08.07.2003 19:43
>	        An: j=C3=BCrgen h=C3=B6ller [werk3AT]; =
spr...@li...
>	        Cc:
>	        Betreff: RE: [Springframework-developer] Tags using expression
>language??
>	      =20
>	      =20
>=09
>	        Ok, here we go...
>	      =20
>	        Like you said, at first glance, it does not look like the =
i21:bind tag
>	        needs expressionalization (hmmm, nice huh ;-). However, in the =
petclinic
>	        demo app I'm seeing a lot of input.jsps in the jsp/fields =
directory.
>	        These are things I'm hoping to solve using for instance =
EL-based tags...
>	        Attached you'll find a reworked version of the ownerForm. It =
does not
>	        use the JSPs from the fields directory anymore, but uses only =
one
>	        input.jsp that uses the bindstatus object to create the input
>field.
>	      =20
>	        Ok, it's still all rough and reworking the tags is a little =
bit more
>	        work than the 15 minutes I spent on it now, but maybe you're =
getting the
>	        idea.
>	      =20
>	        Consequences for adding / reworking the tags:
>	      =20
>	        1. dependency on jakarta-jstl-1.0.3 (jakarta.apache.org/taglib =
-->
>	        standard).
>	        2. dependency on jstl-1.0.3 (java.sun.com)
>	        3. In case you want to have both version in there, an =
extending class
>	        for each tag
>	        4. For each tag, a BeanInfo class
>	        5. I wasn't able to use the EvalHelper from jakarta, so I =
copied it
>	        (hmmm... not so nice, is it ;-)
>	      =20
>	        Probably I don't have time this week or something to refactor =
them to be
>	        all EL-based... Just let me know if you'd like it.
>	      =20
>	        Well, that's it for now, still discovering really cool =
features and
>	        already running out (brain)memory to think up everything I =
could do with
>	        Spring ;-)
>	      =20
>	        Cheers,
>	      =20
>	        Alef
>	      =20
>=09
>	=
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=D6=9F=E7=9B=A20
>	Z(~(W(}iT)~{
>	+=D7=AFzZ)zXX*kx=1F=C5=A0u=DE=96^X(=1E~zwilq zlX)=DF=A3))~{
>	+=D7=AFzZ)
>
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?[??=DA=AD?(~?+??=E9=AE=8A=1FY?
>=DA=A6??j?h??^??-?x?????:0?Z=1Aw?jU?l????=DD=81?Z~??n?$?=0C0???j?=1F??(?=
??W???(}?i?_???????????????????????????????????*k?x=1F???=C5=A0??=D7=AFzZ=
)z???X??X??*k?x=1F???=C5=A0??=D7=AFzZ)z???l??.?=C7=9F??=1E?w???i????+-??(=
??=1E~??{?=DE=B7?b????+-?w???k?x=1F???=C5=A0??=D7=AFzZ)
>
>
> =20
>

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