/// <summary>
/// Gets a collection providing the message set that pass the specified filter.
/// </summary>
/// <param name="filter">Filter to apply.</param>
/// <returns>The filtered message collection.</returns>
public FilteredLogMessageCollection <TMessage> GetFilteredCollection(ILogMessageCollectionFilter <TMessage> filter)
{
var collection = new FilteredLogMessageCollection <TMessage>(this, filter);
mFilteredCollections.Add(new WeakReference <FilteredLogMessageCollection <TMessage> >(collection));
return(collection);
}
/// <summary>
/// Unregisters the specified filtered collection, so it does not receive any further notifications
/// when the unfiltered collection changes.
/// </summary>
/// <param name="collection">The filtered collection to unregister.</param>
internal void UnregisterFilteredCollection(FilteredLogMessageCollection <TMessage> collection)
{
for (int i = 0; i < mFilteredCollections.Count; i++)
{
if (mFilteredCollections[i].TryGetTarget(out var other))
{
if (ReferenceEquals(collection, other))
{
mFilteredCollections.RemoveAt(i--);
}
}
else
{
// the filtered collection was collected
// => clean up
mFilteredCollections.RemoveAt(i--);
}
}
}