@Override
	public Position getNextPosition() {
		if(reader == null) {
			if(super.getParamString().equals("")) {
				reader = PositionFileIO.getPositionFileReader(null);
			} else {
				reader = PositionFileIO.getPositionFileReader(super.getParamString());
			}
		}
		return PositionFileIO.getNextPosition(reader);
	}