void Add(DoublyLinking <T> node, DoublyLinking <T> selected, bool isnEnd = true)
{
++Length;
if (selected == null)
{
head = current = end = node;
return;
}
node.PreviousLinq = isnEnd ? selected?.PreviousLinq : selected;
node.NextLinq = isnEnd ? selected : null;
if (isnEnd)
{
if (node.PreviousLinq != null)
{
selected.PreviousLinq.NextLinq = node;
selected.PreviousLinq = node;
}
else
{
selected.PreviousLinq = node;
head = node;
}
}
else
{
selected.NextLinq = node;
end = node;
}
}
public void DeleteCurrent()
{
if (current == null)
{
throw new DeleteNullExeption();
}
--Length;
if (Length == 1)
{
end = head = current = null;
return;
}
DoublyLinking <T> buffer = null;
buffer = current == head ? current.NextLinq : current.PreviousLinq;
if (current == head)
{
head = current.NextLinq;
}
else if (current == end)
{
end = current.PreviousLinq;
}
else
{
current.PreviousLinq.NextLinq = current.NextLinq;
current.NextLinq.PreviousLinq = current.PreviousLinq;
}
current = buffer;
}
public void ChangeCurrent(int count = 1)
{
if (count == 0)
{
return;
}
int indexOfCurrentAfterChange = GetIndexOfCurrent() + count;
if ((indexOfCurrentAfterChange < 0) || (indexOfCurrentAfterChange > Length - 1))
{
throw new MoveExeption();
}
DoublyLinking <T> GetNextLinq() => current.NextLinq;
DoublyLinking <T> GetPreviousLinq() => current.PreviousLinq;
Func <DoublyLinking <T> > getLinq = count > 0 ? (Func <DoublyLinking <T> >)GetNextLinq : GetPreviousLinq;
for (var i = 0; i < Math.Abs(count); ++i)
{
current = getLinq();
}
}
public void GoToEnd()
{
current = end;
}
public void GoToHead()
{
current = head;
}
internal DoublyLinking(T value)
{
PreviousLinq = null;
Value = value;
NextLinq = null;
}