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Vaadin Forum3. Vaadin 6, 7, 8Framework Data Binding

OGNL based implementations of Property, Item and Container

Anders Peterson
1 decade ago Jan 16, 2012 12:07pm

If you don't know what OGNL is, look here:
http://en.wikipedia.org/wiki/OGNL
http://commons.apache.org/ognl/

I'm interested in getting feedback on this from more experienced Vaadin developers (I only have a couple of days experience).

To use these implementations you need to also get OGNL itself (and javassists). You can find them here:
http://search.maven.org/

/Anders

Last updated on Jan, 16th 2012
Henri Sara
1 decade ago Jan 16, 2012 1:39pm

I only took a very quick look at this.

It might be useful to provide notifications of value changes, read-only status changes etc. as that would allow Vaadin components to update their state based on changes on the data API level. You can get most of the code related to this "for free" by inheriting AbstractProperty and AbstractContainer. If using these on read-only data, supporting such listeners might not be necessary, but at least the property class seemed to support write access.

I understand that it is probably not possible to get notifications about value changes that are not made through the property/item/container, though. Not sure if just tracking the changes made through them would help much - it depends on how these classes are used.

Anders Peterson
1 decade ago Jan 17, 2012 10:12am

Just spent a long time writing a message, and then the forum crashed when I pressed the Publish button... Can't be bothered to type everything again.

I made some changes, and attach updated files.

OGNL language guide

/Anders