Are there any commercial or open source Java Swing widgets that implement a rule/predicate editor UI? As an example of what I'm looking for, this image shows Cocoa's (excellent) NSPredicateEditor UI for editing a predicate expression:
I recently built something that does pretty much this for my application. It's somewhat application specific, but I think it should be possible to make it application agnostic. This is a screenshot of what I built:
In my scratching about, I didn't come across anything pre-built that would give me this "for free". But I could just be awful at finding such things.
We built our own and are releasing it under the BSD license. Code is available at https://github.com/physion/java-predicate-editor