public MathTree(InnerNode root, MathNode child)
{
this.nodeStack = new Stack();
this.root = root;
((InnerNode) this.root).AddNode(child);
}
public MathTree(InnerNode root, MathNode left, MathNode right)
{
this.nodeStack = new Stack();
this.root = root;
((InnerNode)this.root).AddNode(left);
((InnerNode)this.root).AddNode(right);
}
public MathNode getCurrentNode()
{
try
{
return (MathNode)nodeStack.Peek();
}
catch
{
// empty stack, create empty root node
this.root = new InnerNode();
this.nodeStack.Push(this.root);
return this.root;
}
}
