internal LiteFileStream(LiteCollection <LiteFileInfo <TFileId> > files, LiteCollection <BsonDocument> chunks, LiteFileInfo <TFileId> file, BsonValue fileId, FileAccess mode)
{
_files = files;
_chunks = chunks;
_file = file;
_fileId = fileId;
_mode = mode;
if (mode == FileAccess.Read)
{
// initialize first data block
_currentChunkData = this.GetChunkData(_currentChunkIndex);
}
else if (mode == FileAccess.Write)
{
_buffer = new MemoryStream(MAX_CHUNK_SIZE);
if (_file.Length > 0)
{
// delete all chunks before re-write
var count = _chunks.DeleteMany("_id BETWEEN { f: @0, n: 0 } AND { f: @0, n: 99999999 }", _fileId);
ENSURE(count == _file.Chunks);
// clear file content length+chunks
_file.Length = 0;
_file.Chunks = 0;
}
}
}
/// <summary>
/// Delete a file inside datafile and all metadata related
/// </summary>
public bool Delete(TFileId id)
{
if (id == null)
{
throw new ArgumentNullException(nameof(id));
}
// get Id as BsonValue
var fileId = _db.Mapper.Serialize(typeof(TFileId), id);
// remove file reference
var deleted = _files.Delete(fileId);
if (deleted)
{
// delete all chunks
_chunks.DeleteMany("_id BETWEEN { f: @0, n: 0} AND {f: @0, n: @1 }", fileId, int.MaxValue);
}
return(deleted);
}