Annotation on XObject from LINQ to XML

Annotation is something like tag or helper object on XML node. You could register multiple annotations. It is registered under signature of method which was used for registration. So when you are registering some classes with common interface, cast the registered instance to the interface first!
To get annotation of value type you will need to use typeof() as parameter.

interface IHandler { void Handle(XElement e);}
class CatHandler : IHandler
{
    public void Handle(XElement e) 
    { Console.WriteLine(e.Attribute("Food").Value); }
}
class DogHandler : IHandler
{
    public void Handle(XElement e) 
    { Console.WriteLine(e.Element("Friend").Value); }
}

class Test
{
static void Main(string[] args)
{
    List<XElement> list=new List<XElement>()
    {
        new XElement("Creature", 
            new XElement("Name", "Bijou"), 
            new XAttribute("Food", "milk"),
            new XAttribute("Type", "Cat")),
        new XElement("Creature", 
            new XElement("Name", "Goro"),
            new XElement("Friend", "Reiko"),
            new XAttribute("Type", "Dog"))
    };

    //registration
    foreach (XElement element in list)
    {
        switch(element.Attribute("Type").Value)
        {
        case "Cat" : 
            element.AddAnnotation((IHandler)new CatHandler());
            break;
        case "Dog" : 
            element.AddAnnotation((IHandler)new DogHandler());
            break;
        }
    }

    //usage
    foreach (XElement element in list)
    {
        element.Annotation<IHandler>().Handle(element);
    }
}
}

Jabber behind corporate firewall at 443

Maybe everyone know it. Until recently I had open all ports to the Internet so I used 5222 and 5223. But now I'm behind some rude firewall. I realized that both Jabber servers I'm using are listening also on port 443! This is conn443.netlab.cz:443 for jabber.cz and talk.google.com:443 for GTalk. So, I'm online again.

Paranoid Android

By 446F75676C6173204164616D73

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