@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
@SuppressWarnings("unchecked")
AbstractQuadTreeNode<E> other = (AbstractQuadTreeNode<E>) obj;
if (parent == null) {
if (other.parent != null) return false;
} else if (!parent.equals(other.parent)) return false;
if (splitPoint == null) {
if (other.splitPoint != null) return false;
} else if (!splitPoint.equals(other.splitPoint)) return false;
return true;
}
