public void Find(Action <LeftJoinNode <T, TDiscard> > callback)
{
if (_node == null)
{
LeftJoinNode <T, TDiscard> joinNode = _left.Successors
.OfType <LeftJoinNode <T, TDiscard> >()
.Where(node => _matchRight(node.RightActivation))
.FirstOrDefault();
if (joinNode != null)
{
_node = joinNode;
}
else
{
RightActivation <T> rightActivation = _rightActivation();
_node = _configurator.Left <T, TDiscard>(rightActivation);
_left.AddActivation(_node);
}
}
if (_node != null)
{
callback(_node);
}
}