public void Dispose()
{
current = null;
tree = null;
}
public void Reset()
{
current = null;
}
/// <summary>
/// Returns the depth of a subtree rooted at the parameter value
/// </summary>
public virtual int GetDepth(T value)
{
BinaryTreeNode <T> node = this.Find(value);
return(this.GetDepth(node));
}
/// <summary>
/// Removes a node from the tree and returns whether the removal was successful.
/// </summary>>
public virtual bool Remove(BinaryTreeNode <T> removeNode)
{
if (removeNode == null || removeNode.Tree != this)
{
return(false); //value doesn't exist or not of this tree
}
//Note whether the node to be removed is the root of the tree
bool wasHead = (removeNode == head);
if (this.Count == 1)
{
this.head = null; //only element was the root
removeNode.Tree = null;
size--; //decrease total element count
}
else if (removeNode.IsLeaf) //Case 1: No Children
{
//Remove node from its parent
if (removeNode.IsLeftChild)
{
removeNode.Parent.LeftChild = null;
}
else
{
removeNode.Parent.RightChild = null;
}
removeNode.Tree = null;
removeNode.Parent = null;
size--; //decrease total element count
}
else if (removeNode.ChildCount == 1) //Case 2: One Child
{
if (removeNode.HasLeftChild)
{
//Put left child node in place of the node to be removed
removeNode.LeftChild.Parent = removeNode.Parent; //update parent
if (wasHead)
{
this.Root = removeNode.LeftChild; //update root reference if needed
}
if (removeNode.IsLeftChild) //update the parent's child reference
{
removeNode.Parent.LeftChild = removeNode.LeftChild;
}
else
{
removeNode.Parent.RightChild = removeNode.LeftChild;
}
}
else //Has right child
{
//Put left node in place of the node to be removed
removeNode.RightChild.Parent = removeNode.Parent; //update parent
if (wasHead)
{
this.Root = removeNode.RightChild; //update root reference if needed
}
if (removeNode.IsLeftChild) //update the parent's child reference
{
removeNode.Parent.LeftChild = removeNode.RightChild;
}
else
{
removeNode.Parent.RightChild = removeNode.RightChild;
}
}
removeNode.Tree = null;
removeNode.Parent = null;
removeNode.LeftChild = null;
removeNode.RightChild = null;
size--; //decrease total element count
}
else //Case 3: Two Children
{
//Find inorder predecessor (right-most node in left subtree)
BinaryTreeNode <T> successorNode = removeNode.LeftChild;
while (successorNode.RightChild != null)
{
successorNode = successorNode.RightChild;
}
removeNode.Value = successorNode.Value; //replace value
this.Remove(successorNode); //recursively remove the inorder predecessor
}
return(true);
}
/// <summary>
/// Removes a value from the tree and returns whether the removal was successful.
/// </summary>
public virtual bool Remove(T value)
{
BinaryTreeNode <T> removeNode = Find(value);
return(this.Remove(removeNode));
}
/// <summary>
/// Adds a new element to the tree
/// </summary>
public virtual void Add(T value)
{
BinaryTreeNode <T> node = new BinaryTreeNode <T>(value);
this.Add(node);
}
/// <summary>
/// Creates a new instance of a Binary Tree
/// </summary>
public BinaryTree()
{
head = null;
size = 0;
}