Re: [Geotools-devel] FeatureCollection updates

[Ian S. <Ian...@ar...>]

Hi,

In my work on FeatureCollection, I noticed the CollectionListener
interface. I know that its been stated that this package needs work (in
general) and I think this is one area where thats true.

The CollectionListener interface specifies one method :
collectionChanged(CollectionEvent ce)

And CollectionEvent is a very simple extension of EventObject which only
provides support for the source of the event (in this case the
FeatureCollection) although the constructor allows any Object. 

I propose the addition of some more specific details because of the
following:

Any code interested in "listening" to a FeatureCollection will want to
know what the change was specifically. Either Features were added or
Features were removed. This information can be extracted through
complex, intensive calculations like getting all the features in the
collection, iterating through them and comparing them with what the
listener already has. It would be a lot easier to just pass the
knowledge of what was added or removed to the listener directly.

This would not require changes in the listener interface, only the
CollectionEvent.

Any thoughts?

Ian