Hi Jeromy,
In short yes, I'm trying to do a nested evaluation. I screwed up the
description, but what you've described is what I'm trying to do. I tried all
the permutations you suggested plus more with still no joy. I've used the
reflection API as a backup but I'd prefer to use OGNL.
Any help from the OGNL gurus would be greatly appreciated.
Z.
> Zoran Avtarovski wrote:
>> I¹m trying to achieve something with OGNL and I¹d like to know if it¹s
>> possible and if so how to do it.
>>
>> In my action I have an object called surveyResult with setter/getter. I also
>> have another object called questions with setter/getter.
>>
>> The question object has a string element called questionEntity which is in
>> this case equal to ŒsurveyResult.initialvalue¹
>>
>> What I want to be able to do is use the value from the surveyEntity to get a
>> value from the survey object.
>>
>> I¹ve tried <s:property value="%{questionEntity}"/> which just gives me
>> ŒsurveyResult.intialvalue¹. Is there any way I can actually call
>> surveyResult.intialvalue and get the stored value in surveyResult?
>>
>>
>> Z.
>>
>>
>>
>
> So, I understand that:
> surveyResult.questionEntity="surveyResult.initialValue" (a String)
> and you want to perform a nested evaluation:
>
> eg.
> interimResult = evaluate("surveyResult.questionEntity");
> finalResult = evaluate(interimResult);
>
> The s:property tag does recognise nested expressions. My guess is this:
>
> <s:property value="#root.%{surveyResult.questionEntity}/>
>
> which reads: evaluate surveyResult.questionEntity, then get the property
> with that name from the value stack.
>
> **BUT, I can't remember if #root is right, or #stack, or #context.stack
> #top or something like that; whatever it is that refers to the value
> stack directly. This may be visible for the config browser.
>
> The map notation may be clearer
>
> <s:property value="#root[surveyResult.questionEntity]/>
>
> In the worst case, you can invoke a method directly to get the stack.
>
> Hope that helps a little,
> Jeromy Evans
>
> PS. I don't think this is a good idea as it is may be vulnerable to
> injecting OGNL expressions depending on how surveyResult.questionEntity
> is set.
>
>
>
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