'''
class OysterIterator : IIterator<BSTNode>
{
enum NodeType
{
Left, Right, Self, None
}
private BSTNode Root { get; set; }
private OysterIterator Iterator { get; set; }
private NodeType NodeToGet { get; set; }
private bool HasParent { get; set; }
public OysterIterator(BSTNode root)
{
Root = root;
Reset();
}
private OysterIterator(BSTNode root, bool hasParent): this(root)
{
HasParent = hasParent;
}
// Left branch -> Root -> Right branch -> Null/Reset
public BSTNode Next()
{
if (NodeToGet == NodeType.None)
if (!HasParent) // Only the top root should reset the iterator
{
Reset();
if (NodeToGet == NodeType.None) // After reset it can still be empty (so the collection is empty)
return null;
}
else
return null;
if (NodeToGet == NodeType.Self)
{
if (Root.Right == null)
NodeToGet = NodeType.None;
else
{
NodeToGet = NodeType.Right;
Iterator = new OysterIterator(Root.Right, true);
}
return Root;
}
var node = Iterator.Next();
if (node == null)
{
if (NodeToGet == NodeType.Left)
NodeToGet = NodeType.Self;
else // right node returned null
NodeToGet = NodeType.None;
node = Next();
}
return node;
}
public void Reset()
{
Iterator = null;
NodeToGet = NodeType.None;
if (Root == null) return;
if (Root.Left != null)
{
Iterator = new OysterIterator(Root.Left, true);
NodeToGet = NodeType.Left;
}
else
NodeToGet = NodeType.Self;
}
}
'''
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