private ExtensionHandler() { _handler = new XlsxHandler(null); _handler = new TxtHandler(_handler); _handler = new CsvHandler(_handler); }
public CsvHandler(AbstractExtensionHandler handler) : base(handler) { }
public XlsxHandler(AbstractExtensionHandler handler) : base(handler) { }
protected AbstractExtensionHandler(AbstractExtensionHandler handler) { nextHandler = handler; }