public static void InsertAtEnd(DoubleNode <T> node, DoubleNode <T> insert)
{
var current = Last(node);
insert.Previous = current;
if (insert.Previous != null)
{
insert.Previous.Next = insert;
}
}
public static void InsertAtBeginning(DoubleNode <T> node, DoubleNode <T> insert)
{
var current = First(node);
insert.Next = current;
if (current != null)
{
current.Previous = insert;
}
}
public static DoubleNode <T> Last(DoubleNode <T> node)
{
var current = node;
while (current != null && current.Next != null)
{
current = current.Next;
}
return(current);
}
public static DoubleNode <T> First(DoubleNode <T> node)
{
var current = node;
while (current != null && current.Previous != null)
{
current = current.Previous;
}
return(current);
}
public static void InsertBefore(DoubleNode <T> node, DoubleNode <T> insert)
{
insert.Next = node;
if (node != null && node.Previous != null)
{
node.Previous.Next = insert;
}
if (node != null)
{
node.Previous = insert;
}
}
public static void InsertAfter(DoubleNode <T> node, DoubleNode <T> insert)
{
insert.Previous = node;
insert.Next = node.Next;
if (node != null && node.Next != null)
{
node.Next.Previous = insert;
}
if (node != null)
{
node.Next = insert;
}
}
public static void RemoveNode(DoubleNode <T> node, DoubleNode <T> remove)
{
var current = First(node);
while (current.Next != null)
{
if (current == remove)
{
var previous = current.Previous;
var next = current.Next;
previous.Next = next;
next.Previous = previous;
}
current = current.Next;
}
}
