[RESOLVED] Someone translate this UML for me

[Phire]

http://devzone.zend.com/content/images/mzandstra/patterns1-3.jpg

I don't know UML yet, so I'm having a bit of trouble understanding how that translates into PHP. I'm trying to figure out how Saver relates to Vehicle. Is it basically saying Vehicle extends Saver? or Saver extends Vehicle?

[NogDog]

The line with the diamond on one end is an "aggregation", indicating that the Vehicle class will contain a Saver object.

The lines with open triangles indicate that the classes at the non-triangle end of the line are extended from the class at the triangle end. (And the fact that the top-level classes have their names Italicized would indicate that they are abstract classes.)

[Phire]

Thanks, I guess my question now is how exactly would the Vehicle class contain the Saver object?

[NogDog]

Aggregation basically means the object created from the Vehicle class may include references to one or more objects created from the Saver class. At its most basic, it might be something like:

abstract class Vehicle
{
   private $saver;

   public setSaver(Saver $obj)
   {
      $this->saver = $obj;
   }

   public function save()
   {
      if(!empty($this->saver))
      {
         $this->saver->someSaverMethod();
      }
      else
      {
         // throw exception or return false, etc....
      }
   }
}

// sample usage:
$example = new LandVehicle();
$testSaver = new XmlSaver();
$example->setSaver($testSaver);
$example->save();

[Phire]

Thanks.