public void updateTree(B_Tree <ComparableInt> b_Tree)
{
bTree = b_Tree;
Invalidate();
foundedKey = null;
foundedNode = null;
}
private void Split_Child(B_Tree_Node <T> node, int i)
{
var z = new B_Tree_Node <T>(nodeCount++);
var y = node.Pointers[i];
int mid = t - 1;
for (int j = mid + 1; j < y.Keys.Count; j++)
{
z.Keys.Add(y.Keys[j]);
}
for (int j = y.Keys.Count - 1; j > mid; j--)
{
y.Keys.RemoveAt(j);
}
//if (y.Pointers != null)
//{
for (int j = mid + 1; j < y.Pointers.Count; j++)
{
z.Pointers.Add(y.Pointers[j]);
}
for (int j = y.Pointers.Count - 1; j > mid; j--)
{
y.Pointers.RemoveAt(j);
}
//}
node.Keys.Insert(i, y.Keys[mid]);
y.Keys.RemoveAt(mid);
node.Pointers.Insert(i + 1, z);
}
static private string ToString(B_Tree_Node <T> root, string prefix = "")
{
string result = "";
if (root == null || root.Keys.Count == 0)
{
return("");
}
result += prefix + "|--";
prefix += "| ";
result += "[";
var i = 0;
foreach (var k in root.Keys)
{
result += k.ToString();
if (i != root.Keys.Count - 1)
{
result += ",";
}
i++;
}
result += "]";
result += "\n";
if (root.Pointers != null)
{
foreach (var node in root.Pointers)
{
result += ToString(node, prefix);
}
}
return(result);
}
private void ReadNodeFromFile(B_Tree_Node <T> node)
{
FileStream fileStream = new FileStream(TreeDirectory + "/" + node.NodeId + ".txt", FileMode.Open);
StreamReader reader = new StreamReader(fileStream);
var keys = reader.ReadLine().Split('\t');
if (node.Keys == null)
{
node.Keys = new List <T>();
}
node.Keys.Clear();
foreach (var key in keys)
{
node.Keys.Add(KeyFromStr(key));
}
var ids = reader.ReadLine();
reader.Close();
if (ids != null)
{
node.Pointers.Clear();
var childIds = ids.Split('\t');
foreach (var childId in childIds)
{
node.Pointers.Add(new B_Tree_Node <T>(Convert.ToInt32(childId)));
nodeCount++;
}
}
}
private void InsertNonfull(B_Tree_Node <T> node, T key)
{
var i = 0;
for (i = 0; i < node.Keys.Count; i++)
{
if (key.CompareTo(node.Keys[i]) == 0)
{
return;
}
if (key.CompareTo(node.Keys[i]) < 0)
{
break;
}
}
if (node.Pointers == null || node.Pointers.Count == 0)
{
node.Keys.Insert(i, key);
}
else
{
if (node.Pointers[i].Keys.Count == 2 * t - 1)
{
Split_Child(node, i);
if (key.CompareTo(node.Keys[i]) > 0)
{
i++;
}
}
InsertNonfull(node.Pointers[i], key);
}
}
public void updateTreeWithFoundedElement(B_Tree <ComparableInt> b_Tree, ComparableInt key, B_Tree_Node <ComparableInt> inNode)
{
foundedKey = key;
foundedNode = inNode;
bTree = b_Tree;
Invalidate();
}
private void WriteNodeToFile(B_Tree_Node <T> node)
{
FileStream fileStream = new FileStream(TreeDirectory + "/" + node.NodeId + ".txt", FileMode.Create);
StreamWriter writer = new StreamWriter(fileStream);
for (int i = 0; i < node.Keys.Count; i++)
{
writer.Write(node.Keys[i].ToString());
if (i < node.Keys.Count - 1)
{
writer.Write("\t");
}
}
writer.WriteLine();
for (int i = 0; i < node.Pointers.Count; i++)
{
writer.Write(node.Pointers[i].NodeId);
if (i < node.Pointers.Count - 1)
{
writer.Write("\t");
}
}
writer.Flush();
writer.Close();
}
private void ReadTreeFromFile_r(B_Tree_Node <T> root)
{
ReadNodeFromFile(root);
foreach (var child in root.Pointers)
{
ReadTreeFromFile_r(child);
}
}
private void WriteTreeToFile_r(B_Tree_Node <T> root)
{
WriteNodeToFile(root);
foreach (var node in root.Pointers)
{
WriteTreeToFile_r(node);
}
}
private void ToList_r(B_Tree_Node <T> root, List <T> list)
{
if (root.Pointers.Count != 0)
{
foreach (var node in root.Pointers)
{
ToList_r(node, list);
//list.AddRange(list);
}
}
list.AddRange(root.Keys);
}
public void Insert(T key)
{
if (root.Keys.Count == 2 * t - 1)
{
var s = new B_Tree_Node <T>(null, new B_Tree_Node <T>[] { root }, nodeCount++);
root = s;
Split_Child(s, 0);
InsertNonfull(s, key);
}
else
{
InsertNonfull(root, key);
}
}
public void ReadFromDir(string dir)
{
TreeDirectory = dir;
FileStream fileStream = new FileStream(dir + "/" + "root.txt", FileMode.Open);
StreamReader reader = new StreamReader(fileStream);
int rootId = Convert.ToInt32(reader.ReadLine());
int t = Convert.ToInt32(reader.ReadLine());
reader.Close();
this.t = t;
this.root = new B_Tree_Node <T>(rootId);
nodeCount++;
ReadTreeFromFile_r(root);
}
private NodeSize DrawTree_r(B_Tree_Node <ComparableInt> node, int x_beg, int y_beg, PaintEventArgs e)
{
int x = x_beg, y = y_beg + oneNodeHeight + 20;
int size = 0;
List <NodeSize> sizes = new List <NodeSize>();
foreach (var i in node.Pointers)
{
NodeSize nodeSize = DrawTree_r(i, x, y, e);
size = nodeSize.ChildrenSize;
sizes.Add(nodeSize);
x += size + 20;
}
if (x == x_beg)//Is leaf
{
size = DrawNode(node, x_beg, y_beg, e);
return(new NodeSize()
{
ChildrenSize = size, currentNodeSize = size, currentNodeXBegin = x_beg
});
}
if (x > Size.Width)
{
Size = new Size(x + 2 * oneKeyWidth, Size.Height);
}
if (y > Size.Height)
{
Size = new Size(Size.Width, 2 * y);
}
int element_begin = (x_beg + x - size - 20) / 2;
int element_size = DrawNode(node, element_begin, y_beg, e);
for (int pointerIndex = 0; pointerIndex < sizes.Count; pointerIndex++)
{
e.Graphics.DrawLine(rectanglePen, element_begin + element_size / (sizes.Count - 1) * pointerIndex, y - 20, sizes[pointerIndex].currentNodeXBegin + sizes[pointerIndex].currentNodeSize / 2, y);
}
return(new NodeSize()
{
ChildrenSize = x - x_beg, currentNodeSize = element_size, currentNodeXBegin = element_begin
});
}
private int DrawNode(B_Tree_Node <ComparableInt> node, int x_beg, int y_beg, PaintEventArgs e)
{
int nodeSize = node.Keys.Count * oneKeyWidth + (node.Keys.Count - 1) * delimiterSize;
e.Graphics.DrawRectangle(rectanglePen, x_beg, y_beg, nodeSize, oneNodeHeight);
int currX = x_beg + delimiterSize, currY = y_beg + delimiterSize;
foreach (var i in node.Keys)
{
if (foundedKey != null && i.Value == foundedKey.Value)
{
e.Graphics.FillRectangle(foundedElementBrush, currX, currY, oneKeyWidth, oneNodeHeight);
}
e.Graphics.DrawString(i.ToString(), stringFont, stringBrush, currX, currY);
currX += oneKeyWidth;
e.Graphics.DrawLine(rectanglePen, currX, currY, currX, currY + oneNodeHeight);
currX += delimiterSize;
}
return(nodeSize);
}
private FoundElement <T> Search_r(T key, B_Tree_Node <T> root)
{
FoundElement <T> foundElement = new FoundElement <T>();
int i = 0;
while (i < root.Keys.Count && root.Keys[i].CompareTo(key) < 0)
{
i++;
}
if (i < root.Keys.Count && root.Keys[i].CompareTo(key) == 0)
{
return(new FoundElement <T> {
index = i, node = root
});
}
if (root.Pointers != null && root.Pointers.Count > i)
{
return(Search_r(key, root.Pointers[i]));
}
return(null);
}
private void Remove_r(B_Tree_Node <T> node, T key)
{
var index = -1;
for (int i = 0; i < node.Keys.Count; i++)//Ищем ключ в текущем узле
{
if (key.CompareTo(node.Keys[i]) == 0)
{
index = i;
}
}
if (index >= 0) //Ключ в текущем узле
{
if (node.Pointers == null || node.Pointers.Count == 0) //Текущий узел - лист
{
node.Keys.RemoveAt(index);
}
else
{
var y = node.Pointers[index];
var z = node.Pointers[index + 1];
if (y.Keys.Count >= t)
{
var key1 = y.Keys[y.Keys.Count - 1];
Remove_r(y, key1);
node.Keys[index] = key1;
}
else if (z.Keys.Count >= t)
{
var key1 = z.Keys[0];
Remove_r(z, key1);
node.Keys[index] = key1;
}
else
{
y.Keys.Add(key);
foreach (var k in z.Keys)
{
y.Keys.Add(k);
}
foreach (var p in z.Pointers)
{
y.Pointers.Add(p);
}
node.Keys.RemoveAt(index);
node.Pointers.RemoveAt(index + 1);
if (node == root && node.Keys.Count == 0)
{
root = y;
}
Remove_r(y, key);
}
}
}
else if (node.Pointers != null && node.Pointers.Count > 0)
{
var i = 0;
for (i = 0; i < node.Keys.Count; i++)
{
if (key.CompareTo(node.Keys[i]) < 0)
{
break;
}
}
if (node.Pointers[i].Keys.Count >= t)
{
Remove_r(node.Pointers[i], key);
}
else
{
//var y = node.Pointers[i - 1];
var x = node.Pointers[i];
if (i + 1 < node.Pointers.Count && node.Pointers[i + 1].Keys.Count >= t)
{
var z = node.Pointers[i + 1];
x.Keys.Add(node.Keys[i]);
if (x.Pointers.Count > 0)
{
x.Pointers.Add(z.Pointers[0]);
z.Pointers.RemoveAt(0);
}
node.Keys[i] = z.Keys[0];
z.Keys.RemoveAt(0);
Remove_r(x, key);
}
else if (i - 1 >= 0 && node.Pointers[i - 1].Keys.Count >= t)
{
var y = node.Pointers[i - 1];
x.Keys.Insert(0, node.Keys[i - 1]);
if (x.Pointers.Count > 0)
{
x.Pointers.Insert(0, y.Pointers[y.Pointers.Count - 1]);
y.Pointers.RemoveAt(y.Pointers.Count - 1);
}
node.Keys[i - 1] = y.Keys[y.Keys.Count - 1];
y.Keys.RemoveAt(y.Keys.Count - 1);
Remove_r(x, key);
}
else
{
var y = new B_Tree_Node <T>(nodeCount++);
if (i + 1 < node.Pointers.Count)
{
y = node.Pointers[i + 1];
x.Keys.Add(node.Keys[i]);
node.Keys.RemoveAt(i);
for (int j = 0; j < y.Keys.Count; j++)
{
x.Keys.Add(y.Keys[j]);
}
for (int j = 0; j < y.Pointers.Count; j++)
{
x.Pointers.Add(y.Pointers[j]);
}
node.Pointers.RemoveAt(i + 1);
Remove_r(x, key);
}
else if (i - 1 >= 0)
{
y = node.Pointers[i - 1];
x.Keys.Insert(0, node.Keys[i - 1]);
node.Keys.RemoveAt(i - 1);
for (int j = y.Keys.Count - 1; j >= 0; j--)
{
x.Keys.Insert(0, y.Keys[j]);
}
for (int j = y.Pointers.Count - 1; j >= 0; j--)
{
x.Pointers.Insert(0, y.Pointers[j]);
}
node.Pointers.RemoveAt(i - 1);
if (node.Keys.Count == 0 && node == root)
{
root = x;
}
Remove_r(x, key);
}
}
}
}
}
public B_Tree(int t, keyFromString fromStr)
{
this.t = t;
KeyFromStr = fromStr;
root = new B_Tree_Node <T>(nodeCount++);
}