Bug 196164 IDE plugin broken due to missing dependency on runtime compatibility
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/navigator/ResourceNavigator.java
*/
    public ResourceSorter getSorter() {
        return (ResourceSorter) getTreeViewer().getSorter();
    }
    /**
     * Returns the comparator.
     * 
     * @return the <code>ResourceComparator</code>
     * @since 3.3
     */
    public ResourceComparator getComparator(){
    	return (ResourceComparator) getTreeViewer().getComparator();
    }
    /**
     * Returns the resource viewer which shows the resource hierarchy.
     * @since 2.0
     */
    public TreeViewer getViewer() {
        return viewer;
    }
    /**
     * Returns the tree viewer which shows the resource hierarchy.
     * @return the tree viewer
     * @since 2.0
     */
    public TreeViewer getTreeViewer() {
        return viewer;
    }
    /**
     * Returns the shell to use for opening dialogs.