[Springframework-developer] Re: OGNL

[Rob H. <ro...@ca...>]

I like the idea of having am <expr> tag for something like <expr 
type="ognl">.  In the code we could have something like:

public interface ExpressionEvaluator { 

   String[] getDependencies(String expr);
   Object evaluate(String expr);
} 

Then we could have multiple implementations for the ExpressionEvaluator 
interface for OGNL, Groovy etc. 

Rob 

Rod Johnson writes: 

> <script lang="ognl"> perhaps 
> 
> I think it would be good for the mechanism to be extensible. 
> 
> Guillaume Poirier wrote:
>>> I am somewhat more attracted to the idea of using  a prefix on the value 
>>> inside the <value> tag.
>>  
>> 
>> While I admit that it would be unlikely to cause problem, using a prefix 
>> in a value tag is not 100% backward compatible.  Someone could be using 
>> such prefix currently for a String that should be analysed by once 
>> injected, rather than by Spring.  And I personally find an <ognl> tag 
>> more intuitive for the user.  It's also somewhat easier to implement, not 
>> that it really matters much I guess. 
>> 
>>> My other concern is with the  speed of OGNL.
>> 
>> Adding OGNL support doesn't prevent from adding supports for other 
>> expression languages. :-) 
>> 
>> Guillaume 
>> 
>> ----- Original Message ----- From: "Colin Sampaleanu" <col...@ex...>
>> To: <spr...@li...>
>> Sent: Friday, November 05, 2004 4:46 PM
>> Subject: Re: [Springframework-developer] OGNL 
>> 
>> 
>>> Rob, 
>>> 
>>> No Spring committer has done any work that I know of. However, if you 
>>> look at the thread with the subject "PropertyPathFactoryBean", on Oct. 
>>> 6th Guillaume Poirier posted some OGNL patches. You might want to read 
>>> his email, and take a look at my reply too. Using a new element (<ognl> 
>>> was Guillaume's suggestion) would work in a completely backwards 
>>> compatible fashion. I am somewhat more attracted to the idea of using a 
>>> prefix on the value inside the <value> tag. My other concern is with the 
>>> speed of OGNL. OGNL is quite nice, it's heavily used in Tapestry and I 
>>> found it a lot better than say the JSTL's expression language. However, 
>>> v2.x anyways, is not a speed demon. I'd like to also compare it to 
>>> something like Janino:
>>>   http://www.janino.net/
>>> in terms of best fit for Spring... 
>>> 
>>> Colin 
>>> 
>>> 
>>> Rob Harrop wrote: 
>>> 
>>>> All, 
>>>> 
>>>> Has anyone started work on the OGNL support yet. I have no plans for 
>>>> the weekend and I need to do something other than JMX :) 
>>>> 
>>>> Rob
>>>  
>>> 
>>>  
>>> 
>>> 
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>>  
>> 
>>  
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> 
> --  
> 
> ____________________________________________________
> Rod Johnson
> Interface21 - Spring Services from the Source
> http://www.springframework.com 
> 
> Founder, Spring Framework:
> http://www.springframework.org 
> 
> Author, "Expert One-on-One J2EE Development Without EJB"
> (May 2004, with Juergen Hoeller).
> http://www.amazon.com/exec/obidos/ASIN/0764558315/ 
> 
> Author, "Expert One-on-One J2EE Design and Development"
> (October 2002).
> http://www.amazon.com/exec/obidos/tg/detail/-/0764543857/ 
> 
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