private bool InsertNonFull(BPlusNode <TItem> node, TItem newItem)
{
while (true)
{
var indexToInsert = BinarySearchFindLast(node.Items, newItem);
if (indexToInsert < node.Items.Count && CompareItems(newItem, node.Items[indexToInsert]) == 0)
{
return(false);
//throw new Exception("Item already exists");
}
// leaf node
if (node.IsLeaf)
{
node.InsertItem(indexToInsert, newItem);
return(true);
}
// non-leaf
var child = node.Nodes[indexToInsert];
if (child.HasReachedMaxSize)
{
SplitChild(node, indexToInsert, child);
if (CompareItems(newItem, node.Items[indexToInsert]) > 0)
{
indexToInsert++;
}
}
node = node.Nodes[indexToInsert];
}
}
private void SplitChild(BPlusNode <TItem> parentNode, int nodeToBeSplitIndex, BPlusNode <TItem> nodeToBeSplit)
{
var newNode = new BPlusNode <TItem>(_degree);
parentNode.InsertItem(nodeToBeSplitIndex, nodeToBeSplit.Items[_degree - 1]);
parentNode.InsertNode(nodeToBeSplitIndex + 1, newNode);
var keyRange = nodeToBeSplit.GetItems(_degree, _degree - 1);
newNode.InsertItems(keyRange);
nodeToBeSplit.RemoveItems(_degree - 1, _degree);
if (!nodeToBeSplit.IsLeaf)
{
var nodesRange = nodeToBeSplit.GetNodes(_degree, _degree);
newNode.InsertNodes(nodesRange);
nodeToBeSplit.RemoveNodes(_degree, _degree);
}
}