private FindNodeResult FindNode(T infoToFind)
{
FindNodeResult result = new FindNodeResult {
parent = null, foundNode = root
};
bool foundInfo = false;
while (!foundInfo && result.foundNode != null)
{
var compareResult = infoToFind.CompareTo(result.foundNode.info);
if (compareResult > 0)
{
result.parent = result.foundNode;
result.foundNode = result.foundNode.right;
result.direction = FindDirection.Right;
}
else if (compareResult < 0)
{
result.parent = result.foundNode;
result.foundNode = result.foundNode.left;
result.direction = FindDirection.Left;
}
else
{
foundInfo = true;
}
}
return(result);
}
private FindNodeResult GetRightLeftMostNode(BinaryTreeNode startNode)
{
FindNodeResult retValue = new FindNodeResult {
parent = null, foundNode = startNode
};
if (startNode == null)
{
throw new ArgumentNullException("Invalid starting node.");
}
retValue.foundNode = startNode.right;
retValue.parent = startNode;
retValue.direction = FindDirection.Right;
while (retValue.foundNode.left != null)
{
retValue.parent = retValue.foundNode;
retValue.foundNode = retValue.foundNode.left;
retValue.direction = FindDirection.Left;
}
return(retValue);
}
public void Remove(T infoToRemove)
{
FindNodeResult findResult = FindNode(infoToRemove);
var foundNode = findResult.foundNode;
if (foundNode == null)
{
throw new InformationNotFoundException();
}
if (foundNode.left == null && foundNode.right == null)
{
if (findResult.parent != null)
{
if (findResult.direction == FindDirection.Left)
{
findResult.parent.left = null;
}
else
{
findResult.parent.right = null;
}
}
else
{
root = null;
}
}
else if (foundNode.left == null)
{
if (findResult.direction == FindDirection.Left)
{
findResult.parent.left = foundNode.right;
}
else
{
findResult.parent.right = foundNode.right;
}
}
else if (foundNode.right == null)
{
if (findResult.direction == FindDirection.Left)
{
findResult.parent.left = foundNode.left;
}
else
{
findResult.parent.right = foundNode.left;
}
}
else
{
var leftMostResult = GetRightLeftMostNode(foundNode);
foundNode.info = leftMostResult.foundNode.info;
if (leftMostResult.direction == FindDirection.Left)
{
leftMostResult.parent.left = null;
}
else
{
leftMostResult.parent.right = null;
}
}
}
public FindNodeResponse(FindNodeResult <string> FindNodeResult)
{
this.FindNodeResult = FindNodeResult;
}
