protected void refreshViewer(final IOutlineNode rootNode, final Collection<IOutlineNode> nodesToBeExpanded,
		final Collection<IOutlineNode> selectedNodes) {
	DisplayRunHelper.runAsyncInDisplayThread(new Runnable() {
		public void run() {
			try {
				TreeViewer treeViewer = getTreeViewer();
				if (!treeViewer.getTree().isDisposed()) {
					treeViewer.setInput(rootNode);
					treeViewer.expandToLevel(1);
					treeViewer.setExpandedElements(Iterables.toArray(nodesToBeExpanded, IOutlineNode.class));
					treeViewer.setSelection(new StructuredSelection(Iterables.toArray(selectedNodes,
							IOutlineNode.class)));
					treeUpdated();
				}
			} catch (Throwable t) {
				LOG.error("Error refreshing outline", t);
			}
		}
	});
}

public void setInput(Object input) {
	Control control = getControl();
		if (control == null || control.isDisposed()) {
			throw new IllegalStateException(
				"Need an underlying widget to be able to set the input." + //$NON-NLS-1$
				"(Has the widget been disposed?)"); //$NON-NLS-1$
		}
	Assert.isTrue(getContentProvider() != null,
		"ContentViewer must have a content provider when input is set."); //$NON-NLS-1$

	Object oldInput = getInput();
	contentProvider.inputChanged(this, oldInput, input);
	this.input = input;

	// call input hook
	inputChanged(this.input, oldInput);
}


protected void inputChanged(Object input, Object oldInput) {
 	preservingSelection(new Runnable() {
		public void run() {
			Control tree = getControl();
			tree.setRedraw(false);
			try {
				removeAll(tree);
				tree.setData(getRoot());
				internalInitializeTree(tree);
			} finally {
				tree.setRedraw(true);
			}
		}
	});
}