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From Dave Newton <davelnew...@gmail.com>
Subject Re: [struts-dev] Re: I am working on extending the iterator tag and I am requesting opinions
Date Fri, 08 Jul 2011 14:19:17 GMT
IMO that's too much work for the presentation layer; if someone is
passing nested arrays and expecting the ability to get arbitrary
traversals using OGNL they're barking up the wrong tree.

Dave

On Fri, Jul 8, 2011 at 9:18 AM, Jason Pyeron <jpyeron@pdinc.us> wrote:
>> -----Original Message-----
>> From: Lukasz Lenart [mailto:lukasz.lenart@googlemail.com]
>> Sent: Friday, July 08, 2011 6:16
>> To: Struts Developers List
>> Subject: [struts-dev] Re: I am working on extending the
>> iterator tag and I am requesting opinions
>>
>> Any news on that ?
>
> Object navigation works nicely, we are using it in production on 2 projects
> right now.
> I am still writing unit tests.
>
> What does not work (because it is ill defined) is navigation on arrays of
> arrays.
>
> Ex: [1,2,3,[4,5],6,[7,[8,9]]]
>
> How should that be navigated? My intended solution is to allow the use of a
> lambda expression in OGNL to "select" nodes to traverse. But I have not been
> able to write a working lambda expression for the above traversal to iterate as
> 1,2,3,4,5,6,7,8,9
>
> When I get that done it will be bulletproof.
>
> -Jason
>
>>
>>
>> Regards
>> --
>> Lukasz
>> + 48 606 323 122 http://www.lenart.org.pl/
>> Warszawa JUG conference - Confitura http://confitura.pl/
>>
>>
>> 2011/6/7 Jason Pyeron <jpyeron@pdinc.us>:
>> > Currently the iterator component searched the stack for the
>> iteration
>> > target, then while iterating it pushes the value to the stack.
>> >
>> > In my extension I have support for pre and post traversal
>> of a tree structure.
>> > The pre and post selectors are OGNL expressions. As such it
>> is needed
>> > to have the current node in a value stack during resolution of
>> > left/pre and right/post children for a give node.
>> >
>> > The question is begged should it be pushed on for
>> evaluation and then
>> > popped off after or should it be pushed on before the current value
>> > (in between the current value and the "action")?
>> >
>> > My gut is telling me that push and pop will result in the least
>> > surprise for a developer using it, as there is no
>> possibility of the
>> > node masking an action, but this prevents access of the node from
>> > inside the iterator except through some "status" like option.
>> >
>> > -Jason
>> >
>> > --
>> > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>> > -                                                  
            -
>> > - Jason Pyeron                      PD Inc. http://www.pdinc.us -
>> > - Principal Consultant              10 West 24th Street #100    -
>> > - +1 (443) 269-1555 x333            Baltimore, Maryland 21218   -
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>> > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>> > This message is copyright PD Inc, subject to license 20080407P00.
>> >
>> >
>> >
>> >
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>> >
>>
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>
>
> --
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> -                                                        
      -
> - Jason Pyeron                      PD Inc. http://www.pdinc.us -
> - Principal Consultant              10 West 24th Street #100    -
> - +1 (443) 269-1555 x333            Baltimore, Maryland 21218   -
> -                                                        
      -
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> This message is copyright PD Inc, subject to license 20080407P00.
>
>
>
>
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