* This method must be called by the code generated by the key() function
* prior to returning the node iterator.
*/
public void lookupKey(Object value) {
IntegerArray nodes = (IntegerArray) _index.get(value);
_nodes = (nodes != null) ? (IntegerArray) nodes.clone() : null;
_position = 0;
}
/**
* Callers should not call next() after it returns END.