/// <summary>
/// Adds the given <paramref name="listener"/> to the internal collection.
/// </summary>
/// <param name="listener">Listener to add</param>
private void AddListenerInstance(object listener)
{
if (listener == null)
{
return;
}
lock (_registeredListener) {
_registeredListener.Add(listener);
}
}
/// <inheritdoc />
public IEnumerator <TElement> GetEnumerator()
{
lock (_originSet) {
if (_elementCache != null)
{
return(_elementCache.GetEnumerator());
}
// Copy all matching items into the cache
_elementCache = new LinearList <TElement>();
using (FilterIterator itr = new FilterIterator(_originSet.GetEnumerator(), _wherePredicate)) {
while (itr.MoveNext())
{
_elementCache.Add(itr.Current);
}
}
return(_elementCache.GetEnumerator());
}
}