@Override
public DataSource createDataSource(String tableName, String tableAlias, String driverName) throws DataSourceCreationException {
((GDBMSDriver)driver).setDataSourceFactory(getDataSourceFactory());
AlphanumericFileDataSourceAdapter ds = new AlphanumericFileDataSourceAdapter(tableName, tableAlias,
file, (AlphanumericFileDriver) driver);
return ds;
}