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Posted to dev@struts.apache.org by Łukasz Lenart <lu...@googlemail.com> on 2011/07/08 12:15:33 UTC
Re: I am working on extending the iterator tag and I am requesting opinions
Any news on that ?
Regards
--
Łukasz
+ 48 606 323 122 http://www.lenart.org.pl/
Warszawa JUG conference - Confitura http://confitura.pl/
2011/6/7 Jason Pyeron <jp...@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 -
> - -
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> This message is copyright PD Inc, subject to license 20080407P00.
>
>
>
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Re: [struts-dev] Re: I am working on extending the iterator tag and I
am requesting opinions
Posted by Dave Newton <da...@gmail.com>.
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 <jp...@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 <jp...@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 -
>> > - -
>> > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>> > This message is copyright PD Inc, subject to license 20080407P00.
>> >
>> >
>> >
>> >
>> ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: dev-unsubscribe@struts.apache.org For
>> > additional commands, e-mail: dev-help@struts.apache.org
>> >
>> >
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: dev-unsubscribe@struts.apache.org For
>> additional commands, e-mail: dev-help@struts.apache.org
>>
>>
>
>
> --
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> - -
> - 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.
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@struts.apache.org
> For additional commands, e-mail: dev-help@struts.apache.org
>
>
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RE: [struts-dev] Re: I am working on extending the iterator tag and I am requesting opinions
Posted by Jason Pyeron <jp...@pdinc.us>.
> -----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 <jp...@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 -
> > - -
> > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> > This message is copyright PD Inc, subject to license 20080407P00.
> >
> >
> >
> >
> ---------------------------------------------------------------------
> > To unsubscribe, e-mail: dev-unsubscribe@struts.apache.org For
> > additional commands, e-mail: dev-help@struts.apache.org
> >
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@struts.apache.org For
> additional commands, e-mail: dev-help@struts.apache.org
>
>
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
- -
- 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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