public void nearestN(final double[] key, final int n, final Callback<Object[]> callback) {
HRect hr = HRect.infiniteHRect(key.length);
double max_dist_sqd = Double.MAX_VALUE;
NearestNeighborList nnl = new NearestNeighborList(n);
Distance distance = getDistance();
internalNearest(this, distance, key, hr, max_dist_sqd, 0, key.length, threshold, nnl);
Object[] res = nnl.getAllNodes();
callback.on(res);
}
