categoryProvider = new CategoryProvider(supported,
PROJECT, JAVA_PACKAGE_ROOT, JAVA_PACKAGE, JAVA_TYPE_ROOT, JAVA_MEMBER);
categoryProvider.addObserver(this);
contentProvider = new TreePathContentProvider(
new JavaDataTreeBuilder(categoryProvider));
contentProvider.addObserver(this);
durationProvider = createDurationValueProvider();
durationProvider.addObserver(this);