/// <summary>
/// Insert a new file content inside datafile in _files collection
/// </summary>
public LiteFileInfo Upload(LiteFileInfo file, Stream stream)
{
if (file == null)
{
throw new ArgumentNullException("id");
}
if (stream == null)
{
throw new ArgumentNullException("stream");
}
file.UploadDate = DateTime.Now;
// insert file in _files collections with 0 file length
_engine.Insert(FILES, new BsonDocument[] { file.AsDocument });
// for each chunk, insert as a chunk document
foreach (var chunk in file.CreateChunks(stream))
{
_engine.Insert(CHUNKS, new BsonDocument[] { chunk });
}
// update fileLength/chunks to confirm full file length stored in disk
_engine.Update(FILES, new BsonDocument[] { file.AsDocument });
return(file);
}
/// <summary>
/// Delete a file inside datafile and all metadata related
/// </summary>
public bool Delete(string id)
{
if (string.IsNullOrEmpty(id))
{
throw new ArgumentNullException("id");
}
// remove file reference in _files
var d = _engine.Delete(FILES, Query.EQ("_id", id));
// if not found, just return false
if (d == 0)
{
return(false);
}
var index = 0;
while (true)
{
var del = _engine.Delete(CHUNKS, Query.EQ("_id", LiteFileInfo.GetChunckId(id, index++)));
if (del == 0)
{
break;
}
}
return(true);
}
/// <summary>
/// Load data inside storage and returns as Stream
/// </summary>
internal LiteFileStream OpenRead(LiteFileInfo entry)
{
if (entry == null)
{
throw new ArgumentNullException("entry");
}
return(new LiteFileStream(_engine, entry));
}
private byte[] GetChunkData(int index)
{
// check if there is no more chunks in this file
var chunk = _engine
.Find(LiteFileStorage.CHUNKS, Query.EQ("_id", LiteFileInfo.GetChunckId(_file.Id, index)))
.FirstOrDefault();
// if chunk is null there is no more chunks
return(chunk == null ? null : chunk["data"].AsBinary);
}
internal LiteFileStream(DbEngine engine, LiteFileInfo file)
{
_engine = engine;
_file = file;
if (file.Length == 0)
{
throw LiteException.FileCorrupted(file);
}
_positionInChunk = 0;
_currentChunkIndex = 0;
_currentChunkData = this.GetChunkData(_currentChunkIndex);
}
public static LiteException FileCorrupted(LiteFileInfo file)
{
return(new LiteException(103, "File '{0}' has no content or is corrupted", file.Id));
}