Hi guys,
I'm desparate for your help: I just can't figure out how to suppress an
Image in case its IResource yields nothing.
Here's some context:
A customer may have a custom logo image (in fact, there's some logic
involved in determining which exact logo to use, but that's beside the
point) located in some database. Using Wicket's Image component, I
figured I would need to implement the logo resolution algorithm and
loading from the DB with either subclassing DynamicImageResource, or
subclassing AbstractResourceStream (which is more approriate?).
Works fine if a logo is there -- the image shows up. However, if there
_is_ no logo, the browser (firefox in my case) renders a question mark
instead of showing nothing. Both returning null or an empty byte array
doesn't matter.
I usually suppress a component with a behavior, or within the
#onConfigure()-Method, but in the Image's case, where I only have an
IResource or ResourceReference, I just don't have a hint on how to
determine if the image data is there or not (apart from asking the
database _again_ for the data or presence thereof).
Any ideas? What method/class have I missed? Where should I look?
Thanks for your help.
Cheers
Stefan
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