/// <summary>
/// This method get from the user the web service that he want
/// to create an object, and create a singleton object.
/// </summary>
/// <param name="str">The desired service.</param>
/// <returns>Return an object from the type of the chosen REStful Web Service.</returns>
public static WeatherData getWeatherDataService(string str)
{
WeatherData wd = null;
if (str.Equals("OPEN_WEATHER_MAP"))
{
wd = WeatherDataSite1.Instance();
}
else if (str.Equals("WORLD_WEATHER_ONLINE"))
{
wd = WeatherDataSite2.Instance();
}
return(wd);
}
