Hi all,
I have found in a couple of places when writing listeners for the
catalog doing stuff like this:
public void handleModifyEvent(CatalogModifyEvent event) {
if ( event.getSource() instanceof DataStoreInfo ) {
}
else if ( event.getSource() instanceof FeatureTypeInfo ) {
}
else if ( ... )
}
And the list goes on. What would be nice is a visitor for catalog
objects. So I could do somethign like this:
public void handleModifyEvent(CatalogModifyEvent event) {
CatalogVisitor visitor = new CatlaogVisitgor() {
void visitDataStoreInfo( DataStoreInfo ) {
}
void visitDataStoreInfo( FeatureTypeInfo ) {
}
...
}
event.getSource().accept( visitor );
}
And ideally a CatalogVisitorAdapter which stubs all the visitor methods
so that a listener can implement only the methods of relevance.
To do this I think we will probably want to add a root interface for all
catalog objects. Say CatalogInfo. It will define the single method:
CatalogInfo {
void accept( CatalogVisitor );
}
Thoughts? Comments? Objections?
-Justin
--
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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