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); }