Package org.geotools.event

Allows for events on GeoTools nested data structures.

See:
Description

Interface Summary

GTComponent	Provides support for Parent/Child relationships for the event system.
GTDelta	Indicates which style constructs have been changed.
GTDeltaVisitor	Allows for processing of StyleDeltas.
GTEvent	Captures changes to Style.
GTListener	Listens to changes in the Style content.
GTNote
GTRoot	Indicates the "root" of a Geotools data structure with event notification.

Class Summary

AbstractGTComponent	Provides basic StyleEvent notification, may be used in conjuction with StyleList during event handling.
AbstractGTRoot	Provides basic StyleEvent notification, may be used in conjuction with StyleList during event handling.
GTAdapter	Helper class for listenting to style events.
GTCloneUtil	Deprecated.
GTConstant	Indicates a constant immutable data object, may be shared (and will not issue change notifications).
GTDelta.Kind	Kind of Delta, used to indicate change.
GTDeltaImpl	Describes the extent of changes.
GTEvent.Type	Constants used to indicate the type of StyleChangedEvent
GTEventImpl	Captures changes to Style.
GTList
GTNoteImpl

Package org.geotools.event Description

Allows for events on GeoTools nested data structures.

Several of the GeoTools objects are produced in reference to specifications, in particular XML based specifications. Often we try and match the same abstractions present in a specification like SLD or Filter. But rather then make use of pure Java Beans, and make user interface code responsible for managing a host of listeners we are providing a single set of listeners located at the object matching the document base.

For more Details:

• This design is similar to EMF, or JFace use (aka borrow code examples)
• Not specific to Documents (just nesting), the Catalog api will use these events
• We do try and match the document structure perfectly for Feature/FeatureCollection/GML (so that the same XPath expressions can be respected). FeatureCollection and Feature have their own well explored structure and issues and will not be using this event system. Given the size of FeatureCollections it is not practicle for each child to "know" its parent.

References

The following links will be of interest:

• Eclipse Modeling Framework
• JFace

Author:

Jody Garnett, Refractions Research