Base Entity Manager for Symfony Project

BaseManager.php

<?php
namespace AppBundle\Manager;
/**
 * Base Entity Manager with common methods commonly used
 *
 * @author benoit
 */
use Doctrine\ORM\EntityManager;
use Doctrine\Common\Persistence\ObjectManager;
use Doctrine\Common\Persistence\ObjectRepository;

/**
 * Class BaseManager
 */
abstract class BaseManager
{
    /**
     * @var ManagerRegistry
     */
    protected $em;

    /**
     * @var string
     */
    protected $class;
    
/**
     * {@inheritdoc}
     */
    public function getConnection()
    {
        return $this->getEntityManager()->getConnection();
    }

    /**
     * @return EntityManager
     */
    public function getEntityManager()
    {
        return $this->em;
    }

    /**
     * @param string          $class
     * @param EntityManager   $em
     */
    public function __construct($class, EntityManager $em)
    {
        $this->em = $em;
        $this->class = $class;
    }
 
    /**
     * {@inheritdoc}
     */
    public function getClass()
    {
        return $this->class;
    }

    /**
     * {@inheritdoc}
     */
    public function findAll()
    {
        return $this->getRepository()->findAll();
    }

    /**
     * {@inheritdoc}
     */
    public function findBy(array $criteria, array $orderBy = null, $limit = null, $offset = null)
    {
        return $this->getRepository()->findBy($criteria, $orderBy, $limit, $offset);
    }

    /**
     * {@inheritdoc}
     */
    public function findOneBy(array $criteria, array $orderBy = null)
    {
        return $this->getRepository()->findOneBy($criteria, $orderBy);
    }

    /**
     * {@inheritdoc}
     */
    public function find($id)
    {
        return $this->getRepository()->find($id);
    }

    /**
     * {@inheritdoc}
     */
    public function create()
    {
        return new $this->class;
    }

    /**
     * {@inheritdoc}
     */
    public function save($entity, $andFlush = true)
    {
        $this->checkObject($entity);

        $this->em->persist($entity);

        if ($andFlush) {
            $this->em->flush();
        }
    }

    /**
     * {@inheritdoc}
     */
    public function delete($entity, $andFlush = true)
    {
        $this->checkObject($entity);

        $this->em->remove($entity);

        if ($andFlush) {
            $this->em->flush();
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getTableName()
    {
        return $this->em->getClassMetadata($this->class)->table['name'];
    }

    /**
     * Returns the related Object Repository.
     *
     * @return ObjectRepository
     */
    public function getRepository()
    {
        return $this->em->getRepository($this->class);
    }
    
    /**
     * @param $object
     *
     * @throws \InvalidArgumentException
     */
    protected function checkObject($object)
    {
        if (!$object instanceof $this->class) {
            throw new \InvalidArgumentException(sprintf(
                'Object must be instance of %s, %s given',
                $this->class, is_object($object)? get_class($object) : gettype($object)
            ));
        }
    }
}