[Springframework-rcp-dev] ConfigurableFormModel.add(...) broken for custom properties?

[Andy D. <an...@ma...>]

I've been eying ConfigurableFormModel.add(String propertyName, 
ValueModel valueModel) in order to support binding components to derived 
properties, but it doesn't appear "add" will work unless a property with 
'propertyName' exists on the backing object.  There is even a comment in 
the code that says:

        // XXX: this is very broken as it assumes that the added value 
model was derived
        // from the property access strategy when this is not always the 
case.


What I'd like to do is allow someone to bind to an expression rather 
than a property.  Something like: binder.bindControl(control, 
"${subtotal + tax + shipping}").  Internally, I'll add a custom property 
to the form using the add(...) method above, with the ValueModel 
computing the result of the expression, as well as listening to the 
individual properties involved in the expression so that it fires a 
property change event when any of the source properties change.  Anyway, 
if the "add(...)" method worked, this would be fairly easy to implement.
Anyone have a problem if I go in and make add(...) work on properties 
that do not exist on the backing bean?  Does anyone rely on add(...) 
throwing an exception for non-existing properties?

  - Andy