public virtual T this[int index]
{
get
{
BaseStream.Position = GetItemOffset(index);
return(ReadItem(index));
}
set
{
long offset = BaseStream.Position = GetItemOffset(index);
int oldSize = FixedItemSize.HasValue ? FixedItemSize.Value : ReadItemSize(index);
int newSize = FixedItemSize.HasValue ? FixedItemSize.Value : GetItemSize(value);
if (oldSize != newSize)
{
_stamp++;
BaseStream.Position = offset + oldSize;
long length = BaseStream.Length - (offset + oldSize);
BaseStream.Move(offset + newSize, length, 1024, ExpandMethod);
BaseStream.SetLength(offset + newSize + length);
// Update offsets
if (_offsets != null)
{
if (_offsets.Count > index + 1)
{
_offsets.RemoveRange(index + 1, _offsets.Count - index - 1);
}
}
}
BaseStream.Position = offset;
WriteItem(index, value);
}
}
public virtual void RemoveAt(int index)
{
if (index < 0)
{
throw new ArgumentOutOfRangeException("index");
}
int total = ReadCount();
if (index >= total)
{
throw new ArgumentOutOfRangeException("index");
}
_stamp++;
long offset = BaseStream.Position = GetItemOffset(index);
int size = ReadItemSize(index);
long length = BaseStream.Length - offset - size;
BaseStream.Position = offset + size;
BaseStream.Move(offset, length, 1024, ExpandMethod);
BaseStream.SetLength(offset + length);
WriteCount(total - 1);
// Update offsets cache
if (_offsets != null)
{
if (_offsets.Count > index + (index == total - 1 ? 0 : 1))
{
_offsets.RemoveRange(index + (index == total - 1 ? 0 : 1), _offsets.Count - index - (index == total - 1 ? 0 : 1));
}
}
}
public virtual void SetRepeat(int index, T value, int count)
{
if (index < 0)
{
throw new ArgumentOutOfRangeException("index");
}
int total = ReadCount();
if (index > total)
{
throw new ArgumentOutOfRangeException("index");
}
if (count > total - index)
{
throw new ArgumentOutOfRangeException("coll");
}
if (count == 0)
{
return;
}
_stamp++;
// Update offsets cache
if (_offsets != null)
{
if (_offsets.Count > index + 1)
{
_offsets.RemoveRange(index + 1, _offsets.Count - index - 1);
}
}
//
long newSize = (FixedItemSize.HasValue ? FixedItemSize.Value : GetItemSize(value)) * count;
long offset = GetItemOffset(index);
BaseStream.Position = GetItemOffset(index + count);
long length = BaseStream.Length - BaseStream.Position;
BaseStream.Move(offset + newSize, length, 1024, ExpandMethod);
BaseStream.SetLength(offset + newSize + length);
BaseStream.Position = offset;
//
for (int i = 0; i < count; i++)
{
// Update offsets cache
if (_offsets != null)
{
if (i > 0 && _offsets.Count >= index)
{
_offsets.Insert(index + i, BaseStream.Position);
}
}
//
WriteItem(index + i, value);
}
}
public virtual void InsertRange(int index, IEnumerable <T> coll)
{
if (coll == null)
{
throw new ArgumentNullException("coll");
}
if (index < 0)
{
throw new ArgumentOutOfRangeException("index");
}
int total = ReadCount();
if (index > total)
{
throw new ArgumentOutOfRangeException("index");
}
_stamp++;
// Update offsets cache
if (_offsets != null)
{
if (_offsets.Count > index + 1)
{
_offsets.RemoveRange(index + 1, _offsets.Count - index - 1);
}
}
//
long newSize = coll.Aggregate(0L, (a, t) => a += FixedItemSize.HasValue ? FixedItemSize.Value : GetItemSize(t));
long offset = BaseStream.Position = GetItemOffset(index);
long length = BaseStream.Length - offset;
BaseStream.Move(offset + newSize, length, 1024, ExpandMethod);
BaseStream.SetLength(offset + newSize + length);
BaseStream.Position = offset;
int i = 0;
foreach (var item in coll)
{
// Update offsets cache
if (_offsets != null)
{
if ((_offsets.Count == 0 || i > 0) && _offsets.Count == (index + 1))
{
_offsets.Insert(index + i, BaseStream.Position);
}
}
//
WriteItem(index + i++, item);
}
WriteCount(total + i);
}
public virtual void Insert(int index, T value)
{
if (index < 0)
{
throw new ArgumentOutOfRangeException("index");
}
int total = ReadCount();
if (index > total)
{
throw new ArgumentOutOfRangeException("index");
}
_stamp++;
// Update offsets cache
if (_offsets != null)
{
if (_offsets.Count > index + 1)
{
_offsets.RemoveRange(index + 1, _offsets.Count - index - 1);
}
}
//
int newSize = FixedItemSize.HasValue ? FixedItemSize.Value : GetItemSize(value);
long offset = BaseStream.Position = GetItemOffset(index);
long length = BaseStream.Length - offset;
BaseStream.Move(offset + newSize, length, 1024, ExpandMethod);
BaseStream.SetLength(offset + newSize + length);
BaseStream.Position = offset;
WriteItem(index, value);
WriteCount(total + 1);
// Update offsets cache
if (_offsets != null)
{
if (_offsets.Count == index)
{
_offsets.Insert(index, offset);
}
}
}
public virtual void RemoveRange(int index, int count)
{
if (index < 0)
{
throw new ArgumentOutOfRangeException("index");
}
int total = ReadCount();
if (index > total)
{
throw new ArgumentOutOfRangeException("index");
}
if (count < 0 || count > total - index)
{
throw new ArgumentOutOfRangeException("count");
}
if (count == 0)
{
return;
}
_stamp++;
long offset = GetItemOffset(index);
BaseStream.Position = GetItemOffset(index + count);
long length = BaseStream.Length - BaseStream.Position;
BaseStream.Move(offset, length, 1024, ExpandMethod);
BaseStream.SetLength(offset + length);
WriteCount(total - count);
// Update offsets cache
if (_offsets != null)
{
if (_offsets.Count > index + (index + count == total ? 0 : 1))
{
_offsets.RemoveRange(index + (index + count == total ? 0 : 1), _offsets.Count - index - (index + count == total ? 0 : 1));
}
}
}
