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From "Jason Pyeron" <jpye...@pdinc.us>
Subject RE: [struts-dev] Re: I am working on extending the iterator tag and I am requesting opinions
Date Fri, 08 Jul 2011 14:18:22 GMT
> -----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
> >
> > --
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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   -
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> > This message is copyright PD Inc, subject to license 20080407P00.
> >
> >
> >
> > 
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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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