public void First()
{
if (s == 0)
{
IsDone = false;
it = null;
if (root == null)
{
s = 0; //no tree, no next
}
else if (root.Left != null)
{
s = 1; //we are in the left subtree
it = new OysterIterator(root.Left);
}
else
{
s = 2;
}
}
if (s == 0)
{
IsDone = true;
Current = null;
}
}
public FranceTravel(BookingDatabase bookingDatabase, OysterDatabase oysterDatabase, ShutterStockDatabase shutterDatabase, TripAdvisorDatabase advisorDatabase, Random random)
{
this.booking = new BookingIterator(bookingDatabase);
this.oyster = new OysterIterator(oysterDatabase);
this.shutter = new ShutterStockIterator(shutterDatabase);
this.advisor = new TripAdvisorIterator(advisorDatabase);
this.random = random;
}
public FranceReview(OysterIterator oyster)
{
while (this.user == null)
{
if (oyster.HasNext)
{
BSTNode node = oyster.GetNext;
this.user = node.UserName;
this.coment = node.Review;
}
else
{
oyster.Reset();
}
}
}
public void Next()
{
if (s == 0)
{
IsDone = true;
Current = null;
return;
}
else if (s == 2)
{
if (root.Right == null)
{
s = 0;
}
else
{
s = 3;
it = new OysterIterator(root.Right);
}
Current = root;
return;
}
it.Next();
var node = it.Current;
if (node == null)
{
if (s == 1)
{
s = 2;
}
else // right node returned null
{
s = 0;
}
Next();
node = Current;
}
Current = node;
return;
}
