private void InitializeCurrentBlockBrowser()
{
int divisionRemainder = _dataStreamDefinition.StreamLengthInBytes % _disk.BlockSizeInBytes;
if (divisionRemainder == 0)
{
divisionRemainder = _disk.BlockSizeInBytes;
}
// Note: логику по созданию я здесь оставлять не планировал. Очевидно, что она не на месте. Какое Enumerator-у дело до
// того, какой у нас блок - последний или не последний? Остается на моей совести.
int occupiedSpace = this.IsAtLastElement
? divisionRemainder
: _disk.BlockSizeInBytes;
var diskBlock = new DiskBlock(_disk, _singlyIndirectReferencesEnumerator.Current, occupiedSpace, 0);
if (!this.IsAtLastElement)
{
_current = diskBlock;
}
else
{
_current = new DiskBlockNodeUpdating(diskBlock, _dataStreamDefinition, _streamOwningNode, _fileSystemNodeStorage);
}
}
public NonEmptyDiskBlockEnumerator(
IVirtualDisk disk,
DataStreamDefinition dataStreamDefinition,
AddressingSystemParameters addressingSystemParameters,
IFileSystemNodeStorage fileSystemNodeStorage,
Node streamOwningNode,
EnumeratorAddressable <int> doubleIndirectListEnumerator)
{
if (disk == null)
{
throw new ArgumentNullException("disk");
}
if (dataStreamDefinition == null)
{
throw new ArgumentNullException("dataStreamDefinition");
}
if (addressingSystemParameters == null)
{
throw new ArgumentNullException("addressingSystemParameters");
}
if (fileSystemNodeStorage == null)
{
throw new ArgumentNullException("fileSystemNodeStorage");
}
if (streamOwningNode == null)
{
throw new ArgumentNullException("streamOwningNode");
}
if (doubleIndirectListEnumerator == null)
{
throw new ArgumentNullException("doubleIndirectListEnumerator");
}
_disk = disk;
_dataStreamDefinition = dataStreamDefinition;
_addressingSystemParameters = addressingSystemParameters;
_fileSystemNodeStorage = fileSystemNodeStorage;
_streamOwningNode = streamOwningNode;
_doubleIndirectListEnumerator = doubleIndirectListEnumerator;
if (doubleIndirectListEnumerator.Count == 0)
{
throw new ArgumentException("doubleIndirectListEnumerator");
}
_numberOfBlocks =
SpaceRequirementsCalculator.GetNumberOfChunksNeededToStoreData(_dataStreamDefinition.StreamLengthInBytes, _disk.BlockSizeInBytes);
_blockSizesCalculator = new AddressingBlockSizesCalculator(addressingSystemParameters.IndirectBlockReferencesCountInDoubleIndirectBlock,
addressingSystemParameters.DataBlockReferencesCountInSingleIndirectBlock);
_addressingSystemSizesOfLastBlocks = _blockSizesCalculator.GetSizesOfAddressingBlocksSufficientToStoreItems(_numberOfBlocks);
this.SetFirstSingleIndirectBlock();
_current = new NullDiskBlock();
_position = PositionBeforeFirstElement;
}
public void Reset()
{
_position = EnumeratorAddressable <IDiskBlock> .IndexOfPositionBeforeFirstElement;
this.SetFirstSingleIndirectBlock();
_current = new NullDiskBlock();
}
public DiskBlockNodeUpdating(IDiskBlock diskBlockWrapped, DataStreamDefinition owningStreamDefinition, Node blockOwningNode, IFileSystemNodeStorage fileSystemNodeStorage)
{
if (diskBlockWrapped == null)
{
throw new ArgumentNullException("diskBlockWrapped");
}
if (owningStreamDefinition == null)
{
throw new ArgumentNullException("owningStreamDefinition");
}
if (blockOwningNode == null)
{
throw new ArgumentNullException("blockOwningNode");
}
if (fileSystemNodeStorage == null)
{
throw new ArgumentNullException("fileSystemNodeStorage");
}
_diskBlockWrapped = diskBlockWrapped;
_owningStreamDefinition = owningStreamDefinition;
_blockOwningNode = blockOwningNode;
_fileSystemNodeStorage = fileSystemNodeStorage;
}
public EmptyDiskBlockEnumerator()
{
_current = new NullDiskBlock();
}
