protected boolean isEmpty(Q query) {
		var visitor = new TreeRecordVisitor() {
			boolean result = true;

			@Override
			protected VisitResult beginNode(NR parent, NR n, QueryInclusion inclusion) {
				if (inclusion == QueryInclusion.NONE) {
					return VisitResult.NEXT;
				}
				if (inclusion == QueryInclusion.ALL) {
					if (n.getDataCount() > 0) {
						result = false;
						return VisitResult.TERMINATE;
					}
				}
				return VisitResult.DESCEND;
			}

			@Override
			protected VisitResult visitData(NR parent, DR d, boolean included) {
				if (included) {
					result = false;
					return VisitResult.TERMINATE;
				}
				return VisitResult.NEXT;
			}
		};
		visit(query, visitor, false);
		return visitor.result;
	}
Called when a node is finished being visited.

This only applies to nodes into which the visitor descends. The visitor will finish a
node in one of three ways: 1) The node's children have all been visited. 2) The visitor
returned {@link VisitResult#TERMINATE} while visiting a descendant. 3) The visitor
returned {@link VisitResult#ASCEND} while visiting a child.

This method may return any result except {@link VisitResult#DESCEND}. If the visitor is
terminating, the return value of this method is ignored.

@param parent the parent of this node, or {@code null} when visiting the root
@param n the node currently being visited
@param inclusion the original inclusion of the query before descending
@return a directive for how the visitor should proceed
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/spatial/AbstractConstraintsTree.java