public void saveRecord(string filename, int position, MyRecord c)
{
bw = new BinaryWriter(File.Open(filename, FileMode.OpenOrCreate, FileAccess.Write));
int startingPosition = position * (sizeof(int) * rozmiar_ciagu + sizeof(bool));
bw.BaseStream.Position = startingPosition;
int[] values = c.getValues();
bw.Write(c.getKey());
bool status = c.isDeleted();
int pointer = c.getOverflowPointer();
bw.Write(status);
bw.Write(pointer);
int counter = 0;
for (int i = startingPosition + (2 * sizeof(int) + 1);
i < startingPosition + (sizeof(int) * rozmiar_ciagu + 1);
i += sizeof(int))
{
bw.Write(values[counter]);
counter++;
}
bw.Close();
}
public void Edit(MyRecord c, string filename)
{
int savesCounter = 0;
int loadsCounter = 0;
int position = findElementsPosition(c.getKey(), ref savesCounter, ref loadsCounter);
myFileManager.saveRecord(filename, position, c);
savesCounter++;
Results editResult = new Results("editRecord", loadsCounter, savesCounter);
editResult.Show();
}
public void addRecord(MyRecord c, ref int sav, ref int load)
{
int whatPage = index.whatPage(c.getKey());
if (MainArea[0].getUsedSize() == 0)
{
addRecord(c, whatPage, ref sav, ref load);
}
else
{
if (findElementsPosition(c.getKey(), ref sav, ref load) == Int32.MaxValue)
{
addRecord(c, whatPage, ref sav, ref load);
}
else
{
Console.WriteLine("Podany element: " + c.getKey() + " juz istnieje!");
}
}
Results addResult = new Results("addRecord", load, sav);
addResult.Show();
}
private void addRecord(MyRecord c, int whatPage, ref int saves, ref int loads)
{
int positionInFile = 0;
int PageSize = MainArea[0].getPageSize(); //wszystkie strony maja taka sama wartosc
positionInFile = (whatPage) * PageSize;
//pierwszy rekord na nowej stronie
if (index.getKey(whatPage) == 0)
{
MyRecord[] page = new MyRecord[PageSize];
for (int i = 0; i < PageSize; i++)
{
page[i] = new MyRecord();
}
page[0] = c;
myFileManager.savePage(FileName, page, positionInFile);
saves++;
index.addIndex(c.getKey(), whatPage);
MainArea[whatPage].incrementUsedSize();
saveIndex();
}
else
{
int PageUsedSize = MainArea[whatPage].getUsedSize();
MyRecord[] page = myFileManager.load(FileName, positionInFile, PageSize);
loads++;
//niepelna strona
if (!MainArea[whatPage].isFull())
{
int positionInPage = PageUsedSize;
for (int i = 0; i < PageUsedSize; i++)
{
if (c.getKey() < page[i].getKey())
{
positionInPage = i;
break;
}
}
//zapis strony
MyRecord[] newPage = new MyRecord[PageSize];
for (int i = 0; i < positionInPage; i++)
{
newPage[i] = page[i];
}
newPage[positionInPage] = c;
for (int i = positionInPage + 1; i < PageSize; i++)
{
newPage[i] = page[i - 1];
}
myFileManager.savePage(FileName, newPage, positionInFile);
saves++;
MainArea[whatPage].incrementUsedSize();
if (c.getKey() < index.getKey(whatPage))
{
index.addIndex(c.getKey(), whatPage);
saveIndex();
}
}
//pelna strona
else
{
//jesli rekord jest mniejszy niz najmniejszy na stronie
if (c.getKey() < page[0].getKey())
{
//na indexie
if (c.getKey() < index.getKey(whatPage))
{
index.addIndex(c.getKey(), whatPage);
saveIndex();
}
//na stronie
MyRecord temp = page[0];
page[0] = c;
c = temp;
page[0].setOverflowPointer(OverflowPointer + OverflowSize);
myFileManager.saveRecord(FileName, positionInFile, page[0]);
saves++;
//na overflow
myFileManager.saveRecord(FileName, OverflowPointer + OverflowSize, c);
saves++;
OverflowSize++;
}
else
{
//znajdywanie odpowiedniego miejsca
int positionInPage = PageUsedSize - 1;
for (int i = 1; i < PageUsedSize; i++)
{
if (c.getKey() < page[i].getKey())
{
positionInPage = i - 1;
break;
}
}
//jesli odpowiedni rekord nie ma overflow
if (page[positionInPage].getOverflowPointer() == Int32.MaxValue)
{
page[positionInPage].setOverflowPointer(OverflowPointer + OverflowSize);
myFileManager.saveRecord(FileName, positionInFile + positionInPage, page[positionInPage]);
myFileManager.saveRecord(FileName, OverflowPointer + OverflowSize, c);
OverflowSize++;
saves += 2;
}
//jesli ma
else
{
int positionOfPreviousElement = page[positionInPage].getOverflowPointer();
MyRecord[] previousElement = myFileManager.load(FileName, positionOfPreviousElement, 1);
loads++;
if (c.getKey() < previousElement[0].getKey())
{
c.setOverflowPointer(page[positionInPage].getOverflowPointer());
page[positionInPage].setOverflowPointer(OverflowPointer + OverflowSize);
myFileManager.saveRecord(FileName, positionInFile + positionInPage, page[positionInPage]);
myFileManager.saveRecord(FileName, OverflowPointer + OverflowSize, c);
OverflowSize++;
saves += 2;
}
else
{
bool status = true;
if (previousElement[0].getOverflowPointer() != Int32.MaxValue)
{
MyRecord[] nextElement = myFileManager.load(FileName, previousElement[0].getOverflowPointer(), 1);
loads++;
//sprwdzaj do ostatniego istniejacego w lancuchu elementu
while (nextElement[0].getTotal() != Int32.MinValue)
{
if (c.getKey() < nextElement[0].getKey())
{
c.setOverflowPointer(previousElement[0].getOverflowPointer());
previousElement[0].setOverflowPointer(OverflowPointer + OverflowSize);
myFileManager.saveRecord(FileName, positionOfPreviousElement, previousElement[0]);
myFileManager.saveRecord(FileName, OverflowPointer + OverflowSize, c);
OverflowSize++;
saves += 2;
status = false;
break;
}
positionOfPreviousElement = previousElement[0].getOverflowPointer();
previousElement = nextElement;
nextElement = myFileManager.load(FileName, previousElement[0].getOverflowPointer(), 1);
loads++;
}
}
//ostatni element w lancuchu
if (status)
{
previousElement[0].setOverflowPointer(OverflowPointer + OverflowSize);
myFileManager.saveRecord(FileName, positionOfPreviousElement, previousElement[0]);
myFileManager.saveRecord(FileName, OverflowPointer + OverflowSize, c);
OverflowSize++;
saves += 2;
}
}
}
}
if (OverflowSize > REORGANIZE_VALUE)
{
Reorganize();
}
}
}
}
