private static void ResultNodeLinkList(DLinkList linklist)
{
Console.WriteLine("Result\n");
DListNode itr = linklist.m_head;
for (int i = 1; i <= linklist.m_count; i++)
{
Console.WriteLine(itr.m_data);
itr = itr.m_next;
if (itr == null)
{
break;
}
}
Console.WriteLine("\n");
itr = linklist.m_tail;
for (int i = 1; i <= linklist.m_count; i++)
{
Console.WriteLine(itr.m_data);
itr = itr.m_previous;
if (itr == null)
{
break;
}
}
}
public void Forth()
{
if (m_node != null)
{
m_node = m_node.m_next;
}
}
private static void ResultNodeList(DListNode list)
{
Console.WriteLine("Result\n");
DListNode itr = list.m_previous.m_previous;
for (int i = 1; i <= 5; i++)
{
Console.WriteLine(itr.m_data);
itr = itr.m_next;
if (itr == null)
{
break;
}
}
Console.WriteLine("\n");
itr = list.m_next.m_next;
for (int i = 1; i <= 5; i++)
{
Console.WriteLine(itr.m_data);
itr = itr.m_previous;
if (itr == null)
{
break;
}
}
}
public void Start()
{
if (m_list != null)
{
m_node = m_list.m_head;
}
}
public DLinkList()
{
DListNode itr = m_head;
DListNode next;
while (itr != null)
{
next = itr.m_next;
itr = null;
itr = next;
}
}
public void Prepend(int p_data)
{
if (m_tail == null)
{
m_tail = m_head = new DListNode(p_data);
}
else
{
m_head.InsertBefore(p_data);
m_head = m_head.m_previous;
}
m_count++;
}
public void Append(int p_data)
{
if (m_head == null)
{
m_head = m_tail = new DListNode(p_data);
}
else
{
m_tail.InsertAfter(p_data);
m_tail = m_tail.m_next;
}
m_count++;
}
public DListNode InsertBefore(int p_data)
{
DListNode newNode = new DListNode(p_data);
newNode.m_previous = m_previous;
if (m_previous != null)
{
m_previous.m_next = newNode;
}
m_previous = newNode;
newNode.m_next = this;
return(newNode);
}
public DListNode InsertAfter(int p_data)
{
DListNode newNode = new DListNode(p_data);
newNode.m_next = m_next;
if (m_next != null)
{
m_next.m_previous = newNode;
}
m_next = newNode;
newNode.m_previous = this;
return(newNode);
}
public void RemoveTail()
{
DListNode node = null;
if (m_tail != null)
{
node = m_tail.m_previous;
m_tail.m_data = null;
m_tail = node;
if (m_tail == null)
{
m_head = null;
}
m_count--;
}
}
public void RemoveHead()
{
DListNode node = null;
if (m_head != null)
{
node = m_head.m_next;
m_head.m_data = null;
m_head = node;
if (m_head == null)
{
m_tail = null;
}
m_count--;
}
}
static void Main(string[] args)
{
// 1
Console.WriteLine("1. List Node");
Console.WriteLine("InsertAfter, InsertBefore\n");
DListNode list = new DListNode(30);
list.InsertAfter(50);
list.InsertAfter(40);
list.InsertBefore(10);
list.InsertBefore(20);
ResultNodeList(list);
// 2
Console.WriteLine("\n///////////////////////////////////////////////");
Console.WriteLine("\n2. Linked List");
Console.WriteLine("Append, Prepend, RemoveHead, RemoveTail\n");
DLinkList linklist = new DLinkList();
linklist.Append(30);
linklist.Append(40);
linklist.Append(50);
linklist.Prepend(20);
linklist.Prepend(10);
Console.WriteLine("Head is " + linklist.m_head.m_data + " and Tail is " + linklist.m_tail.m_data + "\n");
linklist.RemoveHead();
linklist.RemoveTail();
ResultNodeLinkList(linklist);
CheckNullonRemoveNode(linklist);
// 3
Console.WriteLine("\n///////////////////////////////////////////////");
Console.WriteLine("\n3. Iterators");
Console.WriteLine("Insert, Remove\n");
Console.WriteLine("The List Contains\n");
DListIterator itr = linklist.GetIterator();
DListNode node = linklist.m_head;
linklist.Insert(itr, 25);
linklist.Remove(itr, node);
ResultIterator(itr);
Console.ReadLine();
}
public void Insert(DListIterator p_iterator, int p_data)
{
if (p_iterator.m_list != this)
{
return;
}
if (p_iterator.m_node != null)
{
p_iterator.m_node.InsertAfter(p_data);
if (p_iterator.m_node == m_tail)
{
m_tail = p_iterator.m_node.m_next;
}
m_count++;
}
else
{
Append(p_data);
}
}
public void Remove(DListIterator p_iterator, DListNode node)
{
if (p_iterator.m_list != this)
{
return;
}
if (p_iterator.m_node == null)
{
return;
}
if (p_iterator.m_node == m_head)
{
p_iterator.Forth();
RemoveHead();
}
else
{
while (node.m_next != p_iterator.m_node)
{
node = node.m_next;
}
p_iterator.Forth();
if (node.m_next == m_tail)
{
m_tail = node;
}
node.m_next = null;
node.m_next = p_iterator.m_node;
}
m_count--;
}
public DListNode(int value)
{
m_data = value;
m_next = null;
m_previous = null;
}
public DListIterator(DLinkList p_list = null, DListNode p_node = null)
{
m_list = p_list;
m_node = p_node;
}
