private boolean add(ClusteringFeature[] children, ClusteringFeature child) {
    for(int i = 0; i < children.length; i++) {
      if(children[i] == null) {
        children[i] = child;
        return true;
      }
    }
    return false;
  }
private boolean add ( ClusteringFeature [ ] children , ClusteringFeature child ) { for ( int i = 0 ; i < children . length ; i ++ ) { if ( children [ i ] == null ) { children [ i ] = child ; return true ; } } return false ; }
Add a node to the first unused slot.

@param children Children list
@param child Child to add
@return {@code false} if node is full