Conversion problem for bi-dimensional Lists and Arrays

[Damian <da...@webmedia.ro>]

Hi all,

I want to send a bidimensional List and/or a bidimensional array from my 
application's view to the action.

For example, I have a generixMatrix object in the action (with getters 
and setters of course). The genericMatrix should be able to hold any 
kind of object.
I want to set a 'Currency' object's 'value' field from the view, using 
an <input name="OGNL expression" value="theValue">
My problem is that i cannot address the Currency object properly with 
OGNL, or Struts does a bad type conversion.

I tried to represent a currencyMatrix that holds Currency objects
1) In the action:
List<List<Currency>> currencyMatrix
In the view:
currencyMatrix[0][1].value
(currencyMatrix[0])[1].value
currencyMatrix.get(0).get(1)
None of these are working. I debugged and noticed that currencyMatrix 
gets initialized, but instead of RowDTO<Currency> elements, all its 
elements are null.

2) In the action
List<RowDTO<Currency>> currencyMatrix
where RowDTO<T> represents a row, having a field List<T> rowElements
In the view:
currencyMatrix[0].rowElements[1].value
Same as above, currencyMatrix is filled with null elements

3)In the action:
List<currencyRowDTO> currencyMatrix
and RowDTO has a typed list List<Currency> currencyRowElements.
It works, but it does not help me. This forces me to create a new row 
object each time, like personRowDTO, anotherRowDTO etc.

Struts2 documentation specifies that "the Struts 2 type conversion 
mechanism can use generics-based typing to learn the correct target type 
for the conversions", but I think it defects when having nested generic 
types.

I also tried using a bidimensional array like Currency[][] but again I 
cannot find a way to reffer to it with OGNL.

I am open to any suggestions. To make a long story short, all I need is 
a sollution for a matrix-like object that can hold any type of object

Thanks you in advance


-- 

Damian


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