Strategy Pattern Q

Question

Hi,
I've been reading about the Strategy Pattern and I would liek to implement into one of my own small projects.
I have an application called WatchDog, this application checks some directories (provided as parameter) and puts every item in a directory in an appropriate mysql table.
I have this section in my code:
private void insertFile(File aFile, String arg) {
          if (arg.equals("/EBooks"))
               qry.InsertEbook(aFile);
          else if (arg.equals("/MP3"))
               qry.insertMP3(aFile);
                else if (arg.equals("/Videos"))
               qry.insertVideo(aFile);
     }this looks like a perfect candidate for Strategy Pattern to me?
But I'm struggling with the design.
The concept is an insert query, or simpler a query right?
The strategy interface is DataType (EBooks, MP3, Videos, ...)
And Ebook, MP3, Video are ConcreteStrategy classes then???
Can anybody give some clarification on this one pls?
grtz

Answer 1

Not necessarily the Strategy Pattern proper or the best possible solution but you could do something like this:
interface FileHandler
   public void handle(File file);
}And then in in another class:
private Map<String, FileHandler> handlers = new HashMap<String, FileHandler>();
// fill the map with a handler for each directory
private void insertFile(File aFile, String arg) {
   handlers.get(arg).handle(aFile);
}