private void validateLinked(Node node) { if (node.getNext() == null && node.getParent() == null) { throw new IllegalStateException("Added block " + node + " is not linked into the AST"); } }
private void validateUnlinked(Node node) { if (!(node.getNext() == null && node.getParent() == null)) { throw new IllegalStateException("Removed block " + node + " is still linked in the AST"); } }