/// <summary>
/// To read an existing file. Reads the Header
/// </summary>
/// <param name="Order"></param>
/// <param name="Path"></param>
/// <param name="createFixedSizeText"></param>
/// <param name="c"></param>
public Tree(int Order, string Path, ICreateFixedSizeText <T> createFixedSizeText, int c)
{
this.Order = Order;
this.Path = Path;
this.createFixedSizeText = createFixedSizeText;
var buffer = new byte[Header.FixedSize];
using (var fs = new FileStream(Path, FileMode.OpenOrCreate))
{
//fs.Seek(0, SeekOrigin.Begin);
fs.Read(buffer, 0, Header.FixedSize);
}
var HeaderString = ByteGenerator.ConvertToString(buffer);
var values = HeaderString.Split(Util.Separator);
this.Root = Convert.ToInt16(values[0]);
this.Order = Convert.ToInt16(values[1]);
this.LastPosition = Convert.ToInt16(values[2]);
}
internal Node <T> ReadNode(string Path, int Order, int Root, int ID, ICreateFixedSizeText <T> createFixedSizeText)
{
int Father = 0;
if (ID == Root)
{
Father = Util.NullPointer;
}
Node <T> node = new Node <T>(Order, ID, Father, createFixedSizeText);
int HeaderSize = Header.FixedSize;
byte[] buffer;
if (ID <= Root)
{
buffer = new byte[node.FixedSize(node.Father)];
using (var fs = new FileStream(Path, FileMode.OpenOrCreate))
{
fs.Seek((HeaderSize + ((ID - 1) * node.FixedSize(1))), SeekOrigin.Begin);
fs.Read(buffer, 0, node.FixedSize(node.Father));
}
}
else
{
buffer = new byte[node.FixedSize(node.Father)];
using (var fs = new FileStream(Path, FileMode.OpenOrCreate))
{
fs.Seek((HeaderSize + ((ID - 1) * node.FixedSize(1)) + node.FixedSize(Util.NullPointer)), SeekOrigin.Begin);
fs.Read(buffer, 0, node.FixedSize(node.Father));
}
}
var NodeString = ByteGenerator.ConvertToString(buffer);
var Values = NodeString.Split(Util.Separator);
node.Father = Convert.ToInt32(Values[1]);
//Hijos
int DataLimit = Order;
if (node.Father.Equals(Util.NullPointer))
{
DataLimit = (4 * (Order - 1)) / 3;
int j = 0;
for (int i = 2; i < DataLimit + 2; i++)
{
node.Data[j] = createFixedSizeText.Create(Values[i]);
j++;
}
j = 0;
int StartLimit = node.Data.Count + 2;
for (int i = StartLimit; i < Values.Length - 1; i++)
{
node.Children[j] = Convert.ToInt32(Values[i]);
j++;
}
}
else
{
int j = 0;
for (int i = 2; i < DataLimit + 1; i++)
{
node.Data[j] = createFixedSizeText.Create(Values[i]);
j++;
}
j = 0;
int StartLimit = node.Data.Count + 2;
//Valores
for (int i = StartLimit; i < Values.Length - 1; i++)
{
node.Children[j] = Convert.ToInt32(Values[i]);
j++;
}
}
return(node);
}
