/// <summary>
/// Add a new entry for file. File must be saved so as to be
/// appeared under its parent directory.
/// </summary>
private SqlFile __addFile(string fileName)
{
if ((fileName = checkInvalidChars(fileName)) == null)
{
SqlFsErrCode.CurrentError = FsErr.InvalidChars;
return(null);
}
if (__isAlreadyExist(fileName))
{
SqlFsErrCode.CurrentError = FsErr.NameAlreadyExists;
return(null);
}
FsID newID = SqlFile.addFile(db, fileName, this.ID);
if (newID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.NoNewIDForNewFsNode;
return(null);
}
if (!updateChildList(SqlFsConst.FSOP.ADD, newID, FsID.toFsID(0)))
{
// delete entry just created
SqlFs.deleteEntryByID(db, SqlFs.DBNAMES.FsBlock.ToString(), SqlFs.FSBLOCK.fsID.ToString(), newID);
return(null);
}
SqlFile f = SqlFile.getFile(db, fsLocker, newID);
f.setDataBlockID(SqlFsConst.NOFILEDATAID);
return(f);
}
/// <summary>
/// Add an empty dir
/// </summary>
/// <returns> the newly created dir </returns>
private SqlDir __addDir(string dirName)
{
if ((dirName = checkInvalidChars(dirName)) == null)
{
SqlFsErrCode.CurrentError = FsErr.InvalidChars;
return(null);
}
if (__isAlreadyExist(dirName))
{
SqlFsErrCode.CurrentError = FsErr.NameAlreadyExists;
return(null);
}
FsID newID = SqlDir.addDir(db, dirName, this.ID);
if (newID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.NoNewIDForNewFsNode;
return(null);
}
if (!updateChildList(SqlFsConst.FSOP.ADD, newID, FsID.toFsID(0)))
{
// delete entry just created
SqlFs.deleteEntryByID(db, SqlFs.DBNAMES.FsBlock.ToString(), SqlFs.FSBLOCK.fsID.ToString(), newID);
return(null);
}
return(SqlDir.getDir(db, fsLocker, newID));
}
/// <summary>
/// Save data to data block table
/// </summary>
private bool __saveFileData(IFileData fileData)
{
bool isOK = false;
do
{
FsID dataBlockID = this.getDataBlockID();
if (dataBlockID.compare(SqlFsConst.INVALIDID) == 0) // new file without data will be -1
{
SqlFsErrCode.CurrentError = FsErr.DataBlockIDNotValid;
break;
}
FsID newDataBlockID = fileData.saveData(db, dataBlockID);
if (newDataBlockID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.SaveFileDataErr;
break;
}
// update file size
this.setField(FSBLOCK.fsFileSize, fileData.DataSizeInByte);
// update itself (data block table) so that last mod time can be updated
this.setDataBlockID(newDataBlockID);
isOK = true;
} while (false);
return(isOK);
}
/// <summary>
/// Retrieve data from data block table
/// </summary>
private bool __getFileData(IFileData fileData)
{
FsID dataBlockID = this.getDataBlockID();
if (dataBlockID.compare(SqlFsConst.INVALIDID) <= 0)
{
SqlFsErrCode.CurrentError = FsErr.DataBlockIDNotValid;
return(false);
}
return(fileData.getData(db, dataBlockID));
}
private bool __delete()
{
bool isOK = false;
do
{
// delete itself from parent
SqlDir parent = this.Parent;
if (parent == null)
{
SqlFsErrCode.CurrentError = FsErr.NoParent;
break;
}
if (!parent.updateChildList(SqlFsConst.FSOP.DEL, this.ID, FsID.toFsID(0)))
{
break;
}
// delete entry in data block table
FsID dataBlockID = this.getDataBlockID();
if (dataBlockID.compare(SqlFsConst.INVALIDID) <= 0)
{
//SqlFsLog.debug("+++ dataBlockID = " + dataBlockID.getVal());
SqlFsErrCode.CurrentError = FsErr.DataBlockIDNotValid;
break;
}
if (!SqlFs.deleteEntryByID(db, IFileData.DTABLENAME, IFileData.IDCOL, dataBlockID))
{
SqlFsErrCode.CurrentError = FsErr.CannotDeleteDataBlockEntry;
break;
}
// delete its own entry
if (!SqlFs.deleteEntryByID(db, SqlFs.DBNAMES.FsBlock.ToString(), SqlFs.FSBLOCK.fsID.ToString(), this.ID))
{
SqlFsErrCode.CurrentError = FsErr.CannotDeleteFsEntry;
break;
}
isOK = true;
} while (false);
return(isOK);
}
///
/// <summary>
/// Save data to data block table
/// </summary>
/// @param [in] dataBlockID -- the data block ID if exist. Pass 0 if not exist
/// </param>
/// <returns> dataBlockID if OK </returns>
/// <returns> 0 if failed </returns>
private FsID __saveData(SQLiteDatabase db, FsID dataBlockID)
{
ContentValues contValues = __saveData();
try
{
if (dataBlockID.compare(SqlFsConst.INVALIDID) <= 0)
{
// save new data
if (db.insert(IFileData.DTABLENAME.ToString(), null, contValues) < 0)
{
dataBlockID = SqlFsConst.INVALIDID;
}
else
{
dataBlockID = getLastInsertID(db);
}
}
else
{
// update data
string @where = SqlStr.genWhere(new SqlStr.SqlSimpCond(IFileData.IDCOL, "=", dataBlockID));
if (db.update(IFileData.DTABLENAME.ToString(), contValues, @where, null) == 0)
{
dataBlockID = SqlFsConst.INVALIDID;
}
}
}
catch (Exception e)
{
Log.d("IFileData.__saveData", e.Message);
dataBlockID = SqlFsConst.INVALIDID;
}
return(dataBlockID);
}