protected BinarySearchTreeNode Successor(BinarySearchTreeNode deletedNode)
{
BinarySearchTreeNode successorParent = deletedNode;
BinarySearchTreeNode successor = deletedNode;
BinarySearchTreeNode current = deletedNode.Right;
while (current != null)
{
//swapping
successorParent = successor;
successor = current;
//iterating the loop
current = current.Left;
}
if (successor != deletedNode.Right)
{
successorParent.Left = successor.Right;
successor.Right = deletedNode.Right;
}
return(successor);
}
private BinarySearchTreeNode SearchString(BinarySearchTreeNode Node, string key)
{
if (Node == null)
{
return(null);
}
switch (type)
{
case "Name":
if (String.Compare(Node.Products[0].Name, key, true) == 0)
{
return(Node);
}
else if (String.Compare(Node.Products[0].Name, key, true) > 0)
{
return(SearchString(Node.Left, key));
}
else
{
return(SearchString(Node.Right, key));
}
case "TradeMark":
default:
if (String.Compare(Node.Products[0].TradeMark, key, true) == 0)
{
return(Node);
}
else if (String.Compare(Node.Products[0].TradeMark, key, true) > 0)
{
return(SearchString(Node.Left, key));
}
else
{
return(SearchString(Node.Right, key));
}
}
}
public static void ReBalance(BinarySearchTreeNode ParentNode, BinarySearchTreeNode Node)
{
// if left subtree is too high, and left child has a left child
if (Node.Balance == -2 && Node.Left.Balance == -1)
{
RotateRight(ParentNode, Node);
}
// if right subtree is too high, and right child has a right child
else if (Node.Balance == 2 && Node.Right.Balance == 1)
{
RotateLeft(ParentNode, Node);
}
// Left subtree is too high, and left child has a right child.
else if (Node.Balance == -2 && Node.Left.Balance == 1)
{
RotateLeftRight(ParentNode, Node);
}
// Right subtree is too high, and right child has a left child.
else if (Node.Balance == 2 && Node.Right.Balance == -1)
{
RotateRightLeft(ParentNode, Node);
}
}
public override bool Delete(Product product)
{
BinarySearchTreeNode current = Root;
BinarySearchTreeNode parent = Root;
bool isLeft = true;
while ((decimal)current.Products[0].SalePrice != product.SalePrice)
{
parent = current;
if (product.SalePrice < (decimal)current.Products[0].SalePrice)
{
isLeft = true;
current = current.Left;
}
else
{
isLeft = false;
current = current.Right;
}
if (current == null)
{
return(false);
}
}
// If deleted node has no child
if (current.Left == null && current.Right == null)
{
if (current == Root)
{
Root = null;
}
else if (isLeft)
{
parent.Left = null;
}
else
{
parent.Right = null;
}
}
//If deleted node has one child
else if (current.Right == null)
{
if (current == Root)
{
Root = current.Left;
}
else if (isLeft)
{
parent.Left = current.Left;
}
else
{
parent.Right = current.Left;
}
}
else if (current.Left == null)
{
if (current == Root)
{
Root = current.Right;
}
else if (isLeft)
{
parent.Left = current.Right;
}
else
{
parent.Right = current.Right;
}
}
//If deleted node has two children
else
{
BinarySearchTreeNode successor = Successor(current);
if (current == Root)
{
Root = successor;
}
else if (isLeft)
{
parent.Left = successor;
}
else
{
parent.Right = successor;
}
successor.Left = current.Left;
}
return(true);
}
public IntBST(BinarySearchTreeNode Node) : base(Node)
{
}
public BinarySearchTree(BinarySearchTreeNode Node)
{
Products = new List <Product>();
this.Root = Node;
}
private void Visitation(BinarySearchTreeNode Node)
{
Products.AddRange(Node.Products);
}
public override bool Delete(Product product)
{
BinarySearchTreeNode current = Root;
BinarySearchTreeNode parent = Root;
bool isLeft = true;
switch (type)
{
case "Name":
while (String.Compare(product.Name, current.Products[0].Name, true) != 0)
{
parent = current;
if (String.Compare(product.Name, current.Products[0].Name, true) < 0)
{
isLeft = true;
current = current.Left;
}
else
{
isLeft = false;
current = current.Right;
}
if (current == null)
{
return(false);
}
}
break;
case "TradeMark":
default:
while (String.Compare(product.TradeMark, current.Products[0].TradeMark, true) != 0)
{
parent = current;
if (String.Compare(product.TradeMark, current.Products[0].TradeMark, true) < 0)
{
isLeft = true;
current = current.Left;
}
else
{
isLeft = false;
current = current.Right;
}
if (current == null)
{
return(false);
}
}
break;
}
// If deleted node has no child
if (current.Left == null && current.Right == null)
{
if (current == Root)
{
Root = null;
}
else if (isLeft)
{
parent.Left = null;
}
else
{
parent.Right = null;
}
}
//If deleted node has one child
else if (current.Right == null)
{
if (current == Root)
{
Root = current.Left;
}
else if (isLeft)
{
parent.Left = current.Left;
}
else
{
parent.Right = current.Left;
}
}
else if (current.Left == null)
{
if (current == Root)
{
Root = current.Right;
}
else if (isLeft)
{
parent.Left = current.Right;
}
else
{
parent.Right = current.Right;
}
}
//If deleted node has two children
else
{
BinarySearchTreeNode successor = Successor(current);
if (current == Root)
{
Root = successor;
}
else if (isLeft)
{
parent.Left = successor;
}
else
{
parent.Right = successor;
}
successor.Left = current.Left;
}
return(true);
}
public StringBST(BinarySearchTreeNode node, string type) : base(node)
{
this.type = type;
}