public void FillIndex()
{
fs = File.Open(this.filePath, FileMode.Open);
fs.Seek(0, SeekOrigin.Begin);
IndexRow indexRow;
for (int i = 0; i < numberOfPages; i++)
{
indexRow = new IndexRow(0, i);
Write(indexRow);
}
WritePage();
fs.Close();
}
public void Write(IndexRow indexRow)
{
if (lastWrite < IndexPage.BLOCKING_FACTOR - 1)
{
lastWrite++;
byte[] row = indexRow.GetBytes();
Array.Copy(row, 0, page.diskBlock, this.lastWrite * IndexRow.ROW_SIZE, IndexRow.ROW_SIZE);
}
else
{
WritePage();
Write(indexRow);
}
}
public IndexRow ReadNextRow()
{
IndexRow row = new IndexRow();
if (lastRead < IndexPage.BLOCKING_FACTOR - 1)
{
this.lastRead++;
byte[] rowInBytes = new byte[IndexRow.ROW_SIZE];
Array.Copy(page.diskBlock, lastRead * IndexRow.ROW_SIZE, rowInBytes, 0, rowInBytes.Length);
row.FromBytes(rowInBytes);
}
else
{
ReadPage(this.page.pageNumber + 1);
row = ReadNextRow();
}
return(row);
}
public void UpdateIndex(int pageNumber, int key)
{
this.reads = 0;
this.writes = 0;
fs = File.Open(this.filePath, FileMode.Open);
int page = pageNumber / IndexPage.BLOCKING_FACTOR;
ReadPage(page);
IndexRow row = ReadNextRow();
while (row.page != pageNumber)
{
row = ReadNextRow();
}
row.key = key;
lastWrite = lastRead - 1;
Write(row);
WritePage();
fs.Close();
}
