/**
* Returns the next element of this enumeration if this enumeration object has at least one more
* element to provide.
*
* @return the next element of this enumeration.
* @throws java.util.NoSuchElementException if no more elements exist.
*/
@Override
public IndexTreePath<E> nextElement() {
Enumeration<IndexTreePath<E>> enumeration = queue.peek();
IndexTreePath<E> nextPath = enumeration.nextElement();
Enumeration<IndexTreePath<E>> children;
if (nextPath.getEntry().isLeafEntry()) {
children = EMPTY_ENUMERATION;
} else {
N node = index.getNode(nextPath.getEntry());
children = node.children(nextPath);
}
if (!enumeration.hasMoreElements()) {
queue.remove();
}
if (children.hasMoreElements()) {
queue.offer(children);
}
return nextPath;
}
