public function validate($value, Constraint $constraint)
 {
     if (!$constraint instanceof ComponentEntity) {
         throw new \InvalidArgumentException('Given constraint must ne instance of ComponentEntity class');
     }
     if ($value) {
         try {
             if (!in_array($value, $constraint->getComponentManager()->getComponents())) {
                 throw new \Exception('Component not found');
             }
         } catch (\Exception $e) {
             $this->context->addViolation($constraint->message, array('%string%' => $value));
             return;
         }
     }
 }