static bool RegisterDirectoriesInTree_NoLock(object id, HashSet <FilePath> set)
{
Debug.Assert(Monitor.IsEntered(watchers));
// Remove paths subscribed for this id.
bool modified = false;
if (monitoredDirectories.TryGetValue(id, out var oldDirectories))
{
HashSet <FilePath> toRemove = null;
if (set != null)
{
toRemove = new HashSet <FilePath> (oldDirectories);
// Remove the old ones which are not in the new set.
toRemove.ExceptWith(set);
}
else
{
toRemove = oldDirectories;
}
foreach (var dir in toRemove)
{
var node = tree.RemoveNode(dir, id);
bool wasRemoved = node != null && !node.IsLive;
modified |= wasRemoved;
}
}
// Remove the current registered directories
monitoredDirectories.Remove(id);
if (set == null)
{
return(modified);
}
HashSet <FilePath> toAdd = null;
if (oldDirectories != null)
{
toAdd = new HashSet <FilePath> (set);
toAdd.ExceptWith(oldDirectories);
}
else
{
toAdd = set;
}
// Apply new ones if we have any
if (set.Count > 0)
{
monitoredDirectories [id] = set;
foreach (var path in toAdd)
{
tree.AddNode(path, id, out bool isNew);
// We have only modified the tree if there is any new pathtree node item added
modified |= isNew;
}
}
return(modified);
}