static void Main(string[] args)
{
string endpoint = (args.Length == 0) ? "default endpoint" : args[0];
// old legacy code. or code we do not have access
var xml_provider = new XmlStockDataProvider(endpoint);
// adapter which adaptee old code to user interface
var provider = new JsonStockDataProvider(xml_provider);
// user code. it used xml format before.
var dayly = provider.GetDaylyCounts();
var weekly = provider.GetWeeklyCounts();
var monthlyData = provider.GetMonthlyData();
Console.WriteLine(dayly + Environment.NewLine + weekly + Environment.NewLine + monthlyData);
}
// takes old specification in constructor.
public JsonStockDataProvider(XmlStockDataProvider xmlStockDataProvider)
{
XmlStockDataProvider = xmlStockDataProvider;
}