Translatable Extbase domain model

<?php
namespace Vendor\MyExtension\Domain\Model;

/**
 * Add this to your TypoScript setup:
 *
 * config.tx_extbase.persistence.classes {
 *   Vendor\MyExtension\Domain\Model\Foo.mapping {
 *     columns {
 *       l10n_parent.mapOnProperty = translationParent
 *     }
 *   }
 * }
 *
 * Usage:
 *
 * $fooTranslation = $objectManager->get($targetType);
 * $fooTranslation->_setProperty('_languageUid', $languageUid);
 * $fooTranslation->setTranslationParent($foo);
 * // This allows for immediate access to translation during this request
 * // and easy persistence simply by persisting the original object
 * $foo->addTranslation($fooTranslation);
 * // Set translated property values ...
 * $fooTranslation->setBar('My translation');
 * // Add/update the original object
 * $fooRepository->update($foo);
 */
class Foo extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity {

  /**
   * @var \Vendor\MyExtension\Domain\Model\Foo $translationParent
   */
  protected $translationParent;

  /**
   * @return \Vendor\MyExtension\Domain\Model\Foo
   */
  public function getTranslationParent() {
    return $this->translationParent;
  }

  /**
   * @param \Vendor\MyExtension\Domain\Model\Foo $translationParent
   * @return void
   */
  public function setTranslationParent(\Vendor\MyExtension\Domain\Model\Foo $translationParent) {
    $this->translationParent = $translationParent;
  }

  /**
   * @var \TYPO3\CMS\Extbase\Persistence\ObjectStorage<\Vendor\MyExtension\Domain\Model\Foo>
   */
  protected $translations;

  /**
   * @return \TYPO3\CMS\Extbase\Persistence\ObjectStorage
   */
  public function getTranslations() {
    return $this->translations;
  }

  /**
   * @param \TYPO3\CMS\Extbase\Persistence\ObjectStorage $translations
   * @return void
   */
  public function setTranslations(\TYPO3\CMS\Extbase\Persistence\ObjectStorage $translations) {
    $this->translations = $translations;
  }

  /**
   * @param \Vendor\MyExtension\Domain\Model\Foo $translationLocation
   * @return void
   */
  public function addTranslation(\Vendor\MyExtension\Domain\Model\Foo $translationLocation) {
    $this->translations->attach($translationLocation);
  }

  /**
   * @param \Vendor\MyExtension\Domain\Model\Foo $translationLocation
   * @return void
   */
  public function removeTranslation(\Vendor\MyExtension\Domain\Model\Foo $translationLocation) {
    $this->translations->detach($translationLocation);
  }

  /**
   * Sets up this object
   */
  public function __construct() {

    $this->translations = new \TYPO3\CMS\Extbase\Persistence\ObjectStorage();
  }
}