Eccube\Entity\Product::getMainFileName PHP Method

    public function getMainFileName()
    {
        if (count($this->ProductImage) > 0) {
            return $this->ProductImage[0];
        } else {
            return null;
        }
    }

 /**
  * {@inheritDoc}
  */
 public function getMainFileName()
 {
     $this->__initializer__ && $this->__initializer__->__invoke($this, 'getMainFileName', array());
     return parent::getMainFileName();
 }