public ExcelDataSourceFactory(){
  super("excel",EXCEL_MIME_TYPES,EXCEL_FILE_ENDINGS,ExcelSheetSelectionWizardStep.EXCEL_SHEET_SELECTION_STEP_ID);
}

public ExcelDataSourceFactory ( ) { super ( "excel" , EXCEL_MIME_TYPES , EXCEL_FILE_ENDINGS , ExcelSheetSelectionWizardStep . EXCEL_SHEET_SELECTION_STEP_ID ) ; }
constructs a new factory instance .
