如何在水合器策略课上获得服务定位器?

我想在我的hydrator策略类中获得服务定位器。这是我的策略类:

<?php
namespace Application'Model'Strategies;
use Application'Model'Tables'Entity;
use Zend'Stdlib'Hydrator'Strategy'StrategyInterface;
use Zend'ServiceManager'ServiceLocatorAwareInterface;
use Zend'ServiceManager'ServiceLocatorInterface;
class carBrandStrategy implements StrategyInterface, ServiceLocatorAwareInterface  {
    protected $services;
    public function extract($value) {
        return "hi";
    }
    public function hydrate($value) {
        $entity = new Entity($this->getServiceLocator);
        $tableCarBrands = $entity->getRepository("CarBrands");
        return $tableCarBrands->find($value);
    }
    public function setServiceLocator(ServiceLocatorInterface $serviceLocator) {
        $this->services = $serviceLocator;
    }
    public function getServiceLocator() {
        return $this->services;
    }
} 

我发现我可以使用ServiceLocatorInterface访问服务定位器，但我不能使用它。感谢您的帮助