@Override
        public Object getValueAt(int rowIndex, int columnIndex) {
            SignatureFile file = user.getFiles().get(rowIndex);

            switch (columnIndex) {
                case 0:
                    return (isFileSelected.containsKey(file) ? isFileSelected.get(file) : false);
                case 1:
                    return file.getFile().getName();
                case 2:
                    return file.getLastTestResult();
                case 3:
                    return file.getLastCheckedDate();
                case 4:
                    return file.getLastSignedDate();
                case 5:
                    return file.getAlgorithm();
                default:
                    return null;
            }
        }