/**
* @param aKey a key to look for
* @param aValue (may be null) a value for the give key to look for
* @return all nodes containing the given key (with the given value is specified)
*/
public Iterator<Node> getNodesByTag(final String aKey, final String aValue) {
Iterator<Node> n = myCachingDataSet.getNodesByTag(aKey, aValue);
if (n == null || !n.hasNext()) {
n = myDataSource.getNodesByTag(aKey, aValue);
if (n != null && n.hasNext()) {
LinkedList<Node> nodes = new LinkedList<Node>();
while (n.hasNext()) {
Node node = n.next();
nodes.add(node);
myCachingDataSet.addNode(node);
return nodes.iterator();
}
}
}
return n;
}
