Bug 275929 [CommonNavigator] IPipelinedTreeContentProvider.getPipelinedElements() not ever called
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider.java
ITreeContentProvider, ITreePathContentProvider {
	private static final Object[] NO_CHILDREN = new Object[0];
	private final NavigatorContentService contentService;
	private final boolean isContentServiceSelfManaged;
	
	private final boolean enforceHasChildren;
	private Viewer viewer;
	/**
	 * <p>
	 * Creates a cached {@link NavigatorContentService}&nbsp;from the given
	 * viewer Id.
	 * </p>
	 * 
	 * @param aViewerId
	 *            The associated viewer id that this
	 *            NavigatorContentServiceContentProvider will provide content
	 *            for
	 */
	public NavigatorContentServiceContentProvider(String aViewerId) {
		super();
		contentService = new NavigatorContentService(aViewerId);