//AddAfter
public void AddAfterIndex(int index, T itemToAdd)
{
if (IsEmpty())
{
AddToFront(itemToAdd);
}
else
{
CircularLinkedListNode <T> currentNode = Head;
int count = 0;
while (count < index)
{
currentNode = currentNode.Next;
count++;
}
if (currentNode.Next == Head)
{
AddToEnd(itemToAdd);
}
else
{
CircularLinkedListNode <T> nodeToAdd = new CircularLinkedListNode <T>(itemToAdd, currentNode.Next, currentNode);
currentNode.Next = nodeToAdd;
currentNode.Next.Previous = nodeToAdd;
}
}
}
//RemoveAt
public bool RemoveAt(int index)
{
if (Head == null || index > Count)
{
return(false);
}
if (index == 0)
{
RemoveFirst();
return(true);
}
else
{
CircularLinkedListNode <T> currentNode = Head;
int count = 0;
while (count < index)
{
currentNode = currentNode.Next;
count++;
}
currentNode.Previous.Next = currentNode.Next;
currentNode.Next.Previous = currentNode.Previous;
Count--;
return(true);
}
}
public IEnumerator <CircularLinkedListNode <T> > GetEnumerator()
{
CircularLinkedListNode <T> currentNode = Head;
for (int i = 0; i < Count; i++)
{
yield return(currentNode);
currentNode = currentNode.Next;
}
}
//AddEnd
public void AddToEnd(T itemToAdd)
{
if (IsEmpty())
{
AddToFront(itemToAdd);
}
else
{
Tail.Next = new CircularLinkedListNode <T>(itemToAdd, Head, Tail);
Tail.Next.Previous = Tail;
Tail = Tail.Next;
Tail.Next = Head;
Head.Previous = Tail;
Count++;
}
}
//AddFirst
public void AddToFront(T itemToAdd)
{
if (IsEmpty())
{
Head = new CircularLinkedListNode <T>(itemToAdd);
Tail = Head;
}
else
{
CircularLinkedListNode <T> nodeToAdd = new CircularLinkedListNode <T>(itemToAdd);
nodeToAdd.Next = Head;
Head.Previous = nodeToAdd;
Head = nodeToAdd;
Head.Previous = Tail;
Tail.Next = Head;
}
Count++;
}
//RemoveLast
public bool RemoveLast()
{
if (Head == null)
{
return(false);
}
if (Tail == Head)
{
Head = null;
Count--;
return(true);
}
else
{
Tail = Tail.Previous;
Tail.Next = Head;
Head.Previous = Tail;
Count--;
return(true);
}
}
public CircularLinkedListNode(T ItemToAdd, CircularLinkedListNode <T> next = null, CircularLinkedListNode <T> previous = null)
{
Value = ItemToAdd;
Next = next;
Previous = previous;
}
