[S2] OGNL newbie: obtaining subset of a collection

[Paolo Beccari <pb...@email.it>]

Hi there,

here:
http://struts.apache.org/2.x/docs/ognl.html

I found that:
To select a subset of a collection (called projection), use a wildcard
within the collection.
? - All elements matching the selection logic
^ - Only the first element matching the selection logic
$ - Only the last element matching the selection logic
To obtain a subset of just male relatives from the object person:
person.relatives.{? #this.gender == 'male'}

I can't find the correct syntax to pass a variable (picked from valueStack)
instead of the string 'male'

Someone can help or point me the docs?
P. 


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Re: [S2] OGNL newbie: obtaining subset of a collection

[Paolo Beccari <pb...@email.it>]

Laurie Harper wrote:
> L.
> 
> ObWhine: please don't post unrelated questions to an existing thread. Be 
> sure to start a new thread (with an appropriate subject) by sending a 
> fresh message to the list, rather than using Reply To.
> 
> 

Thanks for the reply.
I'm sorry for the wrong posting, it was not what I intended to do.

P.


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Re: [S2] OGNL newbie: obtaining subset of a collection

[Laurie Harper <la...@holoweb.net>]

Paolo Beccari wrote:
> 
> Hi there,
> 
> here:
> http://struts.apache.org/2.x/docs/ognl.html
> 
> I found that:
> To select a subset of a collection (called projection), use a wildcard
> within the collection.
> ? - All elements matching the selection logic
> ^ - Only the first element matching the selection logic
> $ - Only the last element matching the selection logic
> To obtain a subset of just male relatives from the object person:
> person.relatives.{? #this.gender == 'male'}
> 
> I can't find the correct syntax to pass a variable (picked from valueStack)
> instead of the string 'male'
> 
> Someone can help or point me the docs?
> P.

If the value you want to retrieve in place of the string 'male' is a 
property on your action, just reference it by name. Otherwise, use the 
'#' notation to access it, as in

     person.relatives.{? #this.gender == someProperty}
     person.relatives.{? #this.gender == #somethingElse}

If that doesn't do the trick, you'll need to post more details of what 
data you have stored where and what you want to access.

L.

ObWhine: please don't post unrelated questions to an existing thread. Be 
sure to start a new thread (with an appropriate subject) by sending a 
fresh message to the list, rather than using Reply To.


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