void (@NotNull Node node) { if (!node.children.isValid()) { List<Node> newChildren = getValidChildren(node); List<Node> oldChildren = node.children.set(newChildren); if (oldChildren != null) oldChildren.forEach(child -> child.setParent(null)); if (newChildren != null) newChildren.forEach(child -> child.setParent(node)); if (LOG.isTraceEnabled()) LOG.debug("children updated: ", node); } }