/**
* Filter for nodes.
*
* @param nodes input set of nodes
* @return set of filtered nodes
*/
public Vector filter(Vector nodes) {
SortedVector result = new SortedVector();
Vector filtered = new Vector();
for (int i = 0; i < nodes.size(); i++) result = addNode((Node) nodes.get(i), result);
for (int i = 0; i < result.size(); i++) filtered.add(((NodeDistance) result.get(0)).node);
return filtered;
}
/**
* Add node to samples.
*
* @param node node to add to samples
* @param resultSet set of resulting nodes
* @return set of n nodes
*/
protected SortedVector addNode(Node node, SortedVector resultSet) {
resultSet.add(new NodeDistance(node, point.distance(node)));
while (resultSet.size() > n) resultSet.remove(resultSet.size() - 1);
return resultSet;
}