private void Split(INode nodeAfterEntryAdded)
{
INode newN1, newN2;
if (nodeAfterEntryAdded is NonLeafNode)
{
var result = SplitEntries(nodeAfterEntryAdded);
NonLeafNode n1 = new NonLeafNode(NonLeafNodeIDGenerater());
n1.Level = nodeAfterEntryAdded.Level;
n1.AddEntries(result.Item1);
NonLeafNode n2 = new NonLeafNode(NonLeafNodeIDGenerater());
n2.AddEntries(result.Item2);
n2.Level = nodeAfterEntryAdded.Level;
newN1 = n1;
newN2 = n2;
}
else
{
var result = SplitEntries(nodeAfterEntryAdded);
Leaf n1 = new Leaf(NonLeafNodeIDGenerater());
n1.Level = nodeAfterEntryAdded.Level;
n1.AddEntries(result.Item1);
Leaf n2 = new Leaf(NonLeafNodeIDGenerater());
n2.Level = nodeAfterEntryAdded.Level;
n2.AddEntries(result.Item2);
newN1 = n1;
newN2 = n2;
}
_nodesMap.AddOrUpdate(newN1.ID, newN1, (i, n) => { return(newN1); });
_nodesMap.AddOrUpdate(newN2.ID, newN2, (i, n) => { return(newN2); });
NonLeafNode parentNode;
if (!nodeAfterEntryAdded.IsRoot)
{
parentNode = nodeAfterEntryAdded.ParentNode as NonLeafNode;
parentNode.RemoveEntry(nodeAfterEntryAdded.ID);
_nodesMap.TryRemove(nodeAfterEntryAdded.ID, out nodeAfterEntryAdded);
}
else
{
parentNode = new NonLeafNode(NonLeafNodeIDGenerater());
parentNode.Level = 1;
_root = parentNode;
_nodesMap.AddOrUpdate(_root.ID, _root, (i, n) => { return(_root); });
_nodesMap.TryRemove(nodeAfterEntryAdded.ID, out nodeAfterEntryAdded);
}
parentNode.AddEntry(newN1);
parentNode.AddEntry(newN2);
parentNode.UpdateSubTreeLevel(parentNode.Level);
if (parentNode.Entries.Count() > DEFAULT_MAX_NODE_ENTRIES)
{
OverflowTreatment(parentNode);
}
}
/// <summary>
///
/// </summary>
/// <param name="entryToAdd"></param>
/// <param name="nodeAddTo"></param>
/// <returns></returns>
private INode ChooseSubTree(IEntry entryToAdd, INode nodeAddTo, int entryLevel = -1)
{
if (entryToAdd is NonLeafNode &&
nodeAddTo is NonLeafNode &&
(nodeAddTo as NonLeafNode).Entries.First() is Leaf)
{
return(nodeAddTo);
}
if (entryToAdd is DataEntry &&
nodeAddTo is Leaf)
{
return(nodeAddTo);
}
if (entryLevel == nodeAddTo.Level + 1)
{
if (entryToAdd is Leaf &&
nodeAddTo is NonLeafNode &&
!((nodeAddTo as NonLeafNode).Entries.First() is Leaf))
{
return(ChooseSubTree(entryToAdd, nodeAddTo, ++entryLevel));
}
else
{
return(nodeAddTo);
}
}
NonLeafNode nlf = nodeAddTo as NonLeafNode;
if (nlf.Entries.First() is Leaf)
{
var chosenEntryID = nlf.Entries//.AsParallel()
.OrderBy(e => e.MBR.Area)
.OrderBy(e => e.MBR.EnlargementSize(entryToAdd.MBR))
.OrderBy(e =>
{
return((e as Leaf).Entries
.Sum(e2 => e2.MBR.OverlapSize(entryToAdd.MBR)));
})
.Take(2)
.First().ID;
return(ChooseSubTree(entryToAdd, _nodesMap[chosenEntryID], entryLevel));
}
else
{
var chosenEntryID = nlf.Entries//.AsParallel()
.OrderBy(e => e.MBR.Area)
.OrderBy(e => e.MBR.EnlargementSize(entryToAdd.MBR))
.First().ID;
return(ChooseSubTree(entryToAdd, _nodesMap[chosenEntryID], entryLevel));
}
}
