public bool MoveNext()
{
if (IsBeforeList)
{
levelNode = List.Children.First;
current = (levelNode != null) ? levelNode.Value : null;
IsBeforeList = false;
//StepInThisPass = true;
return(levelNode != null);
}
else if (levelNode == null)
{
return(false);
}
if (sub == null)
{
sub = new Enumerator(levelNode.Value);
}
if (sub.MoveNext())
{
current = (MBlock)sub.Current;
return(true);
}
sub = null;
levelNode = levelNode.Next;
current = (levelNode != null) ? levelNode.Value : null;
return(levelNode != null);
}
private MBlock InsertCompleteBlock(object asset, uint start, uint end)
{
MBlock result;
MBlock query;
FileAddress blockAddr = new FileAddress(start, end);
//create new block
result = new MBlock(new FileAddress(start, end), asset);
//check if block falls within the bounds of an existing block
query = Children.SingleOrDefault(x => x.Address.Start <= start && end <= x.Address.End);
//If block doesn't fall within the bounds of another block
if (query == null)
{
result.Parent = Self;
//if no nodes, add to list
if (Children.Count == 0)
{
result.Self = Children.AddFirst(result);
return(result);
}
else // find a block to link to
{
LinkedListNode <MBlock> curr;
LinkedListNode <MBlock> prev = null;
curr = Children.First;
while (curr != null)
{
if (start < curr.Value.Address.Start)
{
result.Self = Children.AddBefore(curr, result);
return(result);
}
prev = curr;
curr = curr.Next;
}
result.Self = Children.AddAfter(prev, result);
return(result);
}
}
else //block is within another block's bounds
{
//if same reference
if (query.Address == blockAddr)
{
return(query);
}
else if (query.IsBounded)
{
return(query.InsertCompleteBlock(asset, start, end));
}
else if (query.EndSet == false)
{
query.Address = new FileAddress(query.Address.Start, start);
result.Parent = Self;
var node = Children.Find(query);
result.Self = Children.AddAfter(node, result);
return(result);
}
else
{
throw new NotImplementedException();
}
}
}
public Enumerator(MBlock list)
{
List = list;
Reset();
}