/// <summary>
/// Creates an SimplifiedSubFileStream
/// </summary>
/// <param name="stream">The location to read from.</param>
/// <param name="subFile">The file to read.</param>
/// <param name="fileHeaderBlock">The FileAllocationTable</param>
internal SimplifiedSubFileStream(FileStream stream, SubFileHeader subFile, FileHeaderBlock fileHeaderBlock)
{
if (stream is null)
{
throw new ArgumentNullException("stream");
}
if (subFile is null)
{
throw new ArgumentNullException("subFile");
}
if (fileHeaderBlock is null)
{
throw new ArgumentNullException("fileHeaderBlock");
}
if (subFile.DirectBlock == 0)
{
throw new Exception("Must assign subFile.DirectBlock");
}
if (fileHeaderBlock.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "fileHeaderBlock");
}
if (subFile.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "subFile");
}
m_blockSize = fileHeaderBlock.BlockSize;
m_stream = stream;
m_subFile = subFile;
m_fileHeaderBlock = fileHeaderBlock;
}
public SimplifiedSubFileStreamIoSession(FileStream stream, SubFileHeader subFile, FileHeaderBlock header)
{
if (stream is null)
{
throw new ArgumentNullException("stream");
}
if (subFile is null)
{
throw new ArgumentNullException("subFile");
}
if (header is null)
{
throw new ArgumentNullException("header");
}
if (subFile.DirectBlock == 0)
{
throw new Exception("Must assign subFile.DirectBlock");
}
m_stream = stream;
m_header = header;
m_blockSize = header.BlockSize;
m_subFile = subFile;
m_memory = new Memory(m_blockSize);
m_buffer = new byte[m_blockSize];
m_currentPhysicalBlock = -1;
m_blockDataLength = m_blockSize - FileStructureConstants.BlockFooterLength;
}
/// <summary>
/// Creates a simplified file writer.
/// </summary>
/// <param name="pendingFileName"></param>
/// <param name="completeFileName"></param>
/// <param name="blockSize"></param>
/// <param name="flags"></param>
public SimplifiedFileWriter(string pendingFileName, string completeFileName, int blockSize, params Guid[] flags)
{
m_pendingFileName = pendingFileName;
m_completeFileName = completeFileName;
m_fileHeaderBlock = FileHeaderBlock.CreateNewSimplified(blockSize, flags).CloneEditable();
m_fileHeaderBlock.ArchiveType = SortedTreeFile.FileType;
m_stream = new FileStream(pendingFileName, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None);
}
/// <summary>
/// Creates a readonly copy of a transaction.
/// </summary>
/// <param name="dataReader"></param>
internal ReadSnapshot(DiskIo dataReader)
{
if (dataReader is null)
{
throw new ArgumentNullException("dataReader");
}
m_fileHeaderBlock = dataReader.LastCommittedHeader;
m_dataReader = dataReader;
}
/// <summary>
/// Creates an editable copy of the transaction
/// </summary>
/// <param name="dataReader"> </param>
/// <param name="delHasBeenRolledBack">the delegate to call when this transaction has been rolled back</param>
/// <param name="delHasBeenCommitted">the delegate to call when this transaction has been committed</param>
internal TransactionalEdit(DiskIo dataReader, Action delHasBeenRolledBack = null, Action delHasBeenCommitted = null)
{
if (dataReader == null)
{
throw new ArgumentNullException("dataReader");
}
m_openedFiles = new List <SubFileStream>();
m_disposed = false;
m_fileHeaderBlock = dataReader.LastCommittedHeader.CloneEditable();
m_dataReader = dataReader;
m_delHasBeenCommitted = delHasBeenCommitted;
m_delHasBeenRolledBack = delHasBeenRolledBack;
}
/// <summary>
/// Creates this file with the following data.
/// </summary>
/// <param name="diskIo"></param>
/// <param name="header"></param>
/// <param name="file"></param>
/// <param name="isReadOnly"></param>
public SubFileDiskIoSessionPool(DiskIo diskIo, FileHeaderBlock header, SubFileHeader file, bool isReadOnly)
{
LastReadonlyBlock = diskIo.LastCommittedHeader.LastAllocatedBlock;
File = file;
Header = header;
IsReadOnly = isReadOnly;
SourceData = diskIo.CreateDiskIoSession(header, file);
SourceIndex = diskIo.CreateDiskIoSession(header, file);
if (!isReadOnly)
{
DestinationData = diskIo.CreateDiskIoSession(header, file);
DestinationIndex = diskIo.CreateDiskIoSession(header, file);
}
}
/// <summary>
/// Creates an SubFileStream
/// </summary>
/// <param name="dataReader">The location to read from.</param>
/// <param name="subFile">The file to read.</param>
/// <param name="fileHeaderBlock">The FileAllocationTable</param>
/// <param name="isReadOnly">Determines if the stream allows editing.</param>
internal SubFileStream(DiskIo dataReader, SubFileHeader subFile, FileHeaderBlock fileHeaderBlock, bool isReadOnly)
{
if (dataReader == null)
{
throw new ArgumentNullException("dataReader");
}
if (subFile == null)
{
throw new ArgumentNullException("subFile");
}
if (fileHeaderBlock == null)
{
throw new ArgumentNullException("subFile");
}
if (!isReadOnly)
{
if (dataReader.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "dataReader");
}
if (fileHeaderBlock.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "fileHeaderBlock");
}
if (subFile.IsReadOnly)
{
throw new ArgumentException("This parameter cannot be read only when opening for writing", "subFile");
}
}
if (isReadOnly)
{
if (!fileHeaderBlock.IsReadOnly)
{
throw new ArgumentException("This parameter must be read only when opening for reading", "fileHeaderBlock");
}
if (!subFile.IsReadOnly)
{
throw new ArgumentException("This parameter must be read only when opening for reading", "subFile");
}
}
m_blockSize = dataReader.BlockSize;
m_dataReader = dataReader;
m_subFile = subFile;
m_fileHeaderBlock = fileHeaderBlock;
m_isReadOnly = isReadOnly;
}
/// <summary>
/// Creates a <see cref="ShadowCopyAllocator"/> that is used make shadow copies of blocks.
/// </summary>
/// <param name="ioSessions"></param>
public ShadowCopyAllocator(SubFileDiskIoSessionPool ioSessions)
: base(ioSessions)
{
if (ioSessions == null)
{
throw new ArgumentNullException("ioSessions");
}
if (ioSessions.IsReadOnly)
{
throw new ArgumentException("DataReader is read only", "ioSessions");
}
m_lastReadOnlyBlock = ioSessions.LastReadonlyBlock;
m_fileHeaderBlock = ioSessions.Header;
m_subFileHeader = ioSessions.File;
m_ioSessions = ioSessions;
}
