custom form element

<?php
namespace MarketPlace\Attributes\Form\Element;

use Zend\Form\Element;
use Zend\ServiceManager\ServiceLocatorInterface;
use Zend\ServiceManager\ServiceLocatorAwareInterface;


class AttributesValidations extends Element implements ServiceLocatorAwareInterface
{
    protected $_serviceLocator;
    protected $class_list;

    public function __construct(){
        $this->_class_list = $this->validationList();
    }
    public function setServiceLocator(ServiceLocatorInterface $serviceLocator) {
        $this->_serviceLocator = $serviceLocator;
    }

    public function getServiceLocator() {
        return $this->_serviceLocator;
    }

    public function validationList() {
        $validateClass = $this->getServiceLocator()->get('validate_class');
        return $validateClass;
    }



}