private int ShiftIndex(int index, int shift, bool isColumnIndex)
{
var incrementCandidate = index;
incrementCandidate += shift;
var max = isColumnIndex ? _indexHelper.GetMaxColumnIndex(_key) : _indexHelper.GetMaxRowIndex(_key);
if (incrementCandidate > max)
{
index = 0;
}
else if (incrementCandidate < 0)
{
index = max;
}
else
{
index += shift;
}
return(index);
}