private void CopyKeysAndValues(PageCursor fromCursor, int fromPos, PageCursor toCursor, int toPos, int count)
{
fromCursor.CopyTo(KeyOffset(fromPos), toCursor, KeyOffset(toPos), count * KeySize());
fromCursor.CopyTo(ValueOffset(fromPos), toCursor, ValueOffset(toPos), count * ValueSize());
}
internal override void DoSplitInternal(PageCursor leftCursor, int leftKeyCount, PageCursor rightCursor, int insertPos, KEY newKey, long newRightChild, long stableGeneration, long unstableGeneration, KEY newSplitter, double ratioToKeepInLeftOnSplit)
{
int keyCountAfterInsert = leftKeyCount + 1;
int splitPos = splitPos(keyCountAfterInsert, ratioToKeepInLeftOnSplit);
if (splitPos == insertPos)
{
Layout.copyKey(newKey, newSplitter);
}
else
{
KeyAt(leftCursor, newSplitter, insertPos < splitPos ? splitPos - 1 : splitPos, INTERNAL);
}
int rightKeyCount = keyCountAfterInsert - splitPos - 1; // -1 because don't keep prim key in internal
if (insertPos < splitPos)
{
// v-------v copy
// before key _,_,_,_,_,_,_,_,_,_
// before child -,-,-,-,-,-,-,-,-,-,-
// insert key _,_,X,_,_,_,_,_,_,_,_
// insert child -,-,-,x,-,-,-,-,-,-,-,-
// split key ^
leftCursor.CopyTo(KeyOffset(splitPos), rightCursor, KeyOffset(0), rightKeyCount * KeySize());
leftCursor.CopyTo(ChildOffset(splitPos), rightCursor, ChildOffset(0), (rightKeyCount + 1) * ChildSize());
InsertKeyAt(leftCursor, newKey, insertPos, splitPos - 1);
InsertChildAt(leftCursor, newRightChild, insertPos + 1, splitPos - 1, stableGeneration, unstableGeneration);
}
else
{
// pos > splitPos
// v-v first copy
// v-v-v second copy
// before key _,_,_,_,_,_,_,_,_,_
// before child -,-,-,-,-,-,-,-,-,-,-
// insert key _,_,_,_,_,_,_,X,_,_,_
// insert child -,-,-,-,-,-,-,-,x,-,-,-
// split key ^
// pos == splitPos
// first copy
// v-v-v-v-v second copy
// before key _,_,_,_,_,_,_,_,_,_
// before child -,-,-,-,-,-,-,-,-,-,-
// insert key _,_,_,_,_,X,_,_,_,_,_
// insert child -,-,-,-,-,-,x,-,-,-,-,-
// split key ^
// Keys
int countBeforePos = insertPos - (splitPos + 1);
// ... first copy
if (countBeforePos > 0)
{
leftCursor.CopyTo(KeyOffset(splitPos + 1), rightCursor, KeyOffset(0), countBeforePos * KeySize());
}
// ... insert
if (countBeforePos >= 0)
{
InsertKeyAt(rightCursor, newKey, countBeforePos, countBeforePos);
}
// ... second copy
int countAfterPos = leftKeyCount - insertPos;
if (countAfterPos > 0)
{
leftCursor.CopyTo(KeyOffset(insertPos), rightCursor, KeyOffset(countBeforePos + 1), countAfterPos * KeySize());
}
// Children
countBeforePos = insertPos - splitPos;
// ... first copy
if (countBeforePos > 0)
{
// first copy
leftCursor.CopyTo(ChildOffset(splitPos + 1), rightCursor, ChildOffset(0), countBeforePos * ChildSize());
}
// ... insert
InsertChildAt(rightCursor, newRightChild, countBeforePos, countBeforePos, stableGeneration, unstableGeneration);
// ... second copy
if (countAfterPos > 0)
{
leftCursor.CopyTo(ChildOffset(insertPos + 1), rightCursor, ChildOffset(countBeforePos + 1), countAfterPos * ChildSize());
}
}
TreeNode.SetKeyCount(leftCursor, splitPos);
TreeNode.SetKeyCount(rightCursor, rightKeyCount);
}