Metabor\NamedCollection::has PHP Method

    public function has($name)
    {
        return isset($this->collection[$name]);
    }

 /**
  * @see MetaborStd\Statemachine.StateInterface::getEvent()
  */
 public function getEvent($name)
 {
     if ($this->events->has($name)) {
         $event = $this->events->get($name);
     } else {
         $event = new Event($name);
         $this->events->add($event);
     }
     return $event;
 }