function ft_flush_data(filename, varargin)

% FT_FLUSH_DATA removes all data from the data queue

%

% Use as

% ft_flush_data(filename, ...)

%

% See also FT_FLUSH_HEADER, FT_FLUSH_EVENT

% Copyright (C) 2007-2010 Robert Oostenveld

%

% This file is part of FieldTrip, see http://www.fieldtriptoolbox.org

% for the documentation and details.

%

% FieldTrip is free software: you can redistribute it and/or modify

% it under the terms of the GNU General Public License as published by

% the Free Software Foundation, either version 3 of the License, or

% (at your option) any later version.

%

% FieldTrip is distributed in the hope that it will be useful,

% but WITHOUT ANY WARRANTY; without even the implied warranty of

% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

% GNU General Public License for more details.

%

% You should have received a copy of the GNU General Public License

% along with FieldTrip. If not, see <http://www.gnu.org/licenses/>.

%

% $Id$

% set the defaults

dataformat = ft_getopt(varargin, 'dataformat', ft_filetype(filename));

switch dataformat

case 'disp'

% nothing to do

case 'fcdc_buffer'

[host, port] = filetype_check_uri(filename);

buffer('flush_dat', [], host, port);

case 'fcdc_mysql'

% open the database

[user, password, server, port] = filetype_check_uri(filename);

if ~isempty(port)

server = sprintf('%s:%d', server, port);

end

mysql('open', server, user, password);

% remove all previous data

cmd = 'TRUNCATE TABLE fieldtrip.data';

mysql(cmd);

mysql('close');

case 'matlab'

if exist(filename, 'file')

ft_warning('deleting existing file ''%s''', filename);

delete(filename);

end

otherwise

ft_error('unsupported data format');

end