/// <summary>
/// Gets/sets a value.
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
public T this[long index]
{
get
{
if (index >= _virtualSize)
{ // index out of range!
throw new IndexOutOfRangeException();
}
if (_lastAccessedBlock != null &&
_lastAccessedBlock.Index <= index && (_lastAccessedBlock.Index + _blockSize) > index)
{ // the last accessed block is contains the requested value.
return(_lastAccessedBlock.Data[index - _lastAccessedBlock.Index]);
}
// calculate block index.
long blockIndex = index / _blockSize;
// get block.
ArrayBlock block;
if (_arrayBlocks.TryGetValue(blockIndex, out block))
{ // return the value from this block.
_lastAccessedBlock = block; // set last accessed block.
return(_lastAccessedBlock.Data[index - _lastAccessedBlock.Index]);
}
return(default(T)); // no block was found!
}
set
{
if (index >= _virtualSize)
{ // index out of range!
throw new IndexOutOfRangeException();
}
if (_lastAccessedBlock != null &&
_lastAccessedBlock.Index <= index && (_lastAccessedBlock.Index + _blockSize) > index)
{ // the last accessed block is contains the requested value.
_lastAccessedBlock.Data[index - _lastAccessedBlock.Index] = value;
return;
}
// calculate block index.
long blockIndex = index / _blockSize;
// get block.
ArrayBlock block;
if (!_arrayBlocks.TryGetValue(blockIndex, out block) &&
value != null)
{ // return the value from this block.
block = new ArrayBlock(blockIndex * _blockSize, _blockSize);
_arrayBlocks.Add(blockIndex, block);
}
if (block != null)
{ // the block exists.
_lastAccessedBlock = block; // set last accessed block.
_lastAccessedBlock.Data[index - _lastAccessedBlock.Index] = value;
}
}
}
static public void ArrayBlock()
{
ArrayBlock obj = new ArrayBlock();
obj.PlaceObject();
}