password hash eventlistener symfony doctrine

gistfile1.php

<?php
namespace App\EventListener;
use Doctrine\ORM\Event\LifecycleEventArgs;
use App\Entity\User;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
class PasswordHashListener
{
    private $passwordEncoder;
    public function __construct(UserPasswordEncoderInterface $passwordEncoder)
    {
        $this->passwordEncoder = $passwordEncoder;
    }
    public function prePersist(LifecycleEventArgs $args)
    {
        $entity = $args->getEntity();
        // only act on some "User" entity
        if (!$entity instanceof User) {
            return;
        }
        $password = $this->passwordEncoder->encodePassword($entity, $entity->getPlainPassword());
        $entity->setPassword($password);
    }
}