ApplicationData appData = ApplicationDataFactory.getCurrentApplicationData();

class ApplicationDataFactory
{
  public static ApplicationData getCurrentApplicationData()
  {

//notice how im not passing in criteria here, im getting it from the request so call doens't have to know
  String criteria = request.getHTTPHeaderInfo("applicationID");

    if ( criteria.equals("Android") )
      return new Android();

    else if ( criteria.equals("Android-germany") )
        return new Android_germany();

    else if ( criteria.equals("ios_germany") )
          return new ios_germany();

    else if ( criteria.equals("ios"))
      return new ios();

    else if ( criteria.equals("windows") )
      return new windows();

    return null;//or throw exception
  }
}

class Android extends ApplicationData{

@override
public String getType(){
  return "Android"
}
  @override
public Properties getProperties{
    return system.getProperties("android.properties");

  }
}