public BTreeNodeElement(T value)
{
this.value = value;
NextInterval = new BTreeNodeElementInterstice <T>(this, null);
PreviousInterval = new BTreeNodeElementInterstice <T>(null, this);
identifier = Guid.NewGuid();
}
public override string ToString()
{
var builder = new StringBuilder();
BTreeNodeElement <T> start = FirstElement;
while (start != null)
{
builder.Append(start + " - ");
start = start.Next;
}
builder.Append(string.Format("self = {0}, parent = {1}", identifier,
Parent == null ? "NULL" : Parent.Identifier.ToString()));
builder.AppendLine();
BTreeNodeElementInterstice <T> startInterstice = FirstInterstice;
while (startInterstice != null)
{
if (!(startInterstice.NodePointer is NullBTreeNode <T>))
{
builder.AppendLine(startInterstice.NodePointer.ToString());
}
startInterstice = startInterstice.Next;
}
return(builder.ToString());
}
private void InsertInCurrentNode(BTreeNodeElement <T> element)
{
if (firstInterstice == null)
{
element.PreviousInterval.Smaller = null;
element.NextInterval.Larger = null;
firstInterstice = element.PreviousInterval;
element.PreviousInterval.Container = element.NextInterval.Container = this;
return;
}
BTreeNodeElementInterstice <T> insertionInterstice = IntersticeToSearch(element.Value);
if (insertionInterstice.Smaller != null)
{
insertionInterstice.Smaller.NextInterval = element.PreviousInterval;
}
if (insertionInterstice.Larger != null)
{
insertionInterstice.Larger.PreviousInterval = element.NextInterval;
}
element.PreviousInterval.Smaller = insertionInterstice.Smaller;
element.NextInterval.Larger = insertionInterstice.Larger;
if (insertionInterstice == firstInterstice)
{
firstInterstice = element.PreviousInterval;
}
}
public BTreeNodeElement <T> Search(T value)
{
BTreeNodeElement <T> element = ElementContaining(value);
if (element != null)
{
return(element);
}
BTreeNodeElementInterstice <T> interstice = IntersticeToSearch(value);
if (interstice == null || interstice.NodePointer is NullBTreeNode <T> )
{
return(new NullBTreeNodeElement <T>());
}
return(interstice.NodePointer.Search(value));
}
public BTreeNode <T> Find(T value)
{
BTreeNodeElement <T> node = ElementContaining(value);
if (node != null)
{
return(this);
}
BTreeNodeElementInterstice <T> interstice = IntersticeToSearch(value);
if (interstice == null || interstice.NodePointer is NullBTreeNode <T> )
{
return(this);
}
return(interstice.NodePointer.Find(value));
}
private BTreeNodeElementInterstice <T> IntersticeToSearch(T value)
{
BTreeNodeElementInterstice <T> counter = firstInterstice;
while (counter != null)
{
if
(counter.Smaller == null && counter.Larger != null && counter.Larger.Value.CompareTo(value) > 0 ||
counter.Smaller != null && counter.Larger == null && counter.Smaller.Value.CompareTo(value) < 0 ||
counter.Smaller != null && counter.Larger != null && counter.Smaller.Value.CompareTo(value) < 0 &&
counter.Larger.Value.CompareTo(value) > 0)
{
return(counter);
}
counter = counter.Next;
}
return(null);
}
public void TerminateForwardLink()
{
NextInterval = new BTreeNodeElementInterstice <T>(this, null);
}