public static ImmutableMap <string, ICollection <NodeId> > TransposeNodeToLabels(IDictionary
<NodeId, ICollection <string> > mapNodeToLabels)
{
IDictionary <string, ICollection <NodeId> > mapLabelsToNodes = new Dictionary <string
, ICollection <NodeId> >();
foreach (KeyValuePair <NodeId, ICollection <string> > entry in mapNodeToLabels)
{
NodeId node = entry.Key;
ICollection <string> setLabels = entry.Value;
foreach (string label in setLabels)
{
ICollection <NodeId> setNode = mapLabelsToNodes[label];
if (setNode == null)
{
setNode = new HashSet <NodeId>();
}
setNode.AddItem(NodeId.NewInstance(node.GetHost(), node.GetPort()));
mapLabelsToNodes[label] = setNode;
}
}
return(ImmutableMap.CopyOf(mapLabelsToNodes));
}
