I'm attempting to put OGNL to use and think I have uncovered a bug in
Tapestry's OGNL implementation.
I have two assets defined, either of which works fine in the following
context:
<binding name="image" expression="assets.menu_item"/>
However, if I specify the expression as follows:
<binding name="image" expression='visit.selectedMenuItem.equals("Selected")
? "assets.menu_item_selected" : "assets.menu_item" '/>
I get "Parameter image (assets.menu_item_selected) does not implement
interface net.sf.tapestry.IAsset".
I've walked through this in the debugger and OGNL is returning the value I
expect so don't think that's the problem. If I step through the first
example, Tapestry's ExpressionBinding.getObject method recognizes the string
as _invariant and returns a _cachedValue of type ContextAsset. That doesn't
happen with the second expression ... in that case we're no longer
_invariant so ExpressionBinding.resolveProperty gets called, ONGL does its
thing, and the result turns out to be a String instead of a ContextAsset.
At that point, ExpressionBinding's type.isAssignable test fails and the
exception is thrown.
I'm assuming you intend to allow OGNL expressions of this type ... very nice
indeed ... and that there's a simple fix that will allow asset
identification after we've finished the evaluation. I could take a stab at
it, but you're better qualified.
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