private ASTNode getCoveringNode(IAssistContext context) {
private ASTNode getCoveringNode(IInvocationContext context) {
	private ASTNode getCoveringNode(IAssistContext context) {		NodeFinder finder= new NodeFinder(context.getSelectionOffset(), context.getSelectionLength());		context.getASTRoot().accept(finder);		return finder.getCoveringNode();		}