Apache NetBeansHow to get the project for the actual file in the editor?
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get the project from the lookup of the active TopComponent AND/OR
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get the project from the lookup of the active DataObject
Project p = TopComponent.getRegistry().getActivated().getLookup().lookup(Project.class);
if (p == null) {
DataObject dob = TopComponent.getRegistry().getActivated().getLookup().lookup(DataObject.class);
if (dob != null) {
FileObject fo = dob.getPrimaryFile();
p = FileOwnerQuery.getOwner(fo);
...
Taken from platform-dev mailing list / Tim Boudreau
