public void Insert(int index, T item)
{
if (index < 0 || index > Count)
{
throw new ArgumentOutOfRangeException();
}
if (this.IsReadOnly)
{
throw new NotSupportedException("Deque is readonly.");
}
if (index == 0)
{
AddBack(item);
return;
}
if (index == Count)
{
AddFront(item);
return;
}
int totalIndex = GetTotalIndex(index);
HeadPosition headPosition = new HeadPosition()
{
MapPosition = totalIndex / DATABLOCK_LENGTH,
DataBlockOffset = (totalIndex % DATABLOCK_LENGTH)
};
if (headPosition - RearHead < FrontHead - headPosition)
{
T last = QueueMap[headPosition.MapPosition][headPosition.DataBlockOffset];
QueueMap[headPosition.MapPosition][headPosition.DataBlockOffset] = item;
for (var head = headPosition.IncNew();
head != FrontHead;
head.Inc())
{
T temp = QueueMap[head.MapPosition][head.DataBlockOffset];
QueueMap[head.MapPosition][head.DataBlockOffset] = last;
last = temp;
}
AddFront(last);
}
else
{
headPosition.Dec();
T last = QueueMap[headPosition.MapPosition][headPosition.DataBlockOffset];
QueueMap[headPosition.MapPosition][headPosition.DataBlockOffset] = item;
for (var head = headPosition.DecNew();
head != RearHead;
head.Dec())
{
T temp = QueueMap[head.MapPosition][head.DataBlockOffset];
QueueMap[head.MapPosition][head.DataBlockOffset] = last;
last = temp;
}
AddBack(last);
}
}
public void RemoveAt(int index)
{
if (index < 0 || index >= Count)
{
throw new ArgumentOutOfRangeException();
}
if (index == 0)
{
GetBack();
return;
}
if (index == Count - 1)
{
GetFront();
return;
}
int totalIndex = GetTotalIndex(index);
HeadPosition headPosition = new HeadPosition()
{
MapPosition = totalIndex / DATABLOCK_LENGTH,
DataBlockOffset = (totalIndex % DATABLOCK_LENGTH)
};
if (headPosition - RearHead < FrontHead - headPosition)
{
for (var head = headPosition.IncNew();
head != FrontHead;
head.Inc())
{
QueueMap[headPosition.MapPosition][headPosition.DataBlockOffset] = QueueMap[head.MapPosition][head.DataBlockOffset];
headPosition.Inc();
}
GetFront();
}
else
{
for (var head = headPosition.DecNew();
head != RearHead;
head.Dec())
{
QueueMap[headPosition.MapPosition][headPosition.DataBlockOffset] = QueueMap[head.MapPosition][head.DataBlockOffset];
headPosition.Dec();
}
GetBack();
}
}