interface ContentTranslationManagerInterface

interface ContentTranslationManagerInterface {
    
    /**
     * Gets the entity types that support content translation.
     *
     * @return \Drupal\Core\Entity\EntityTypeInterface[]
     *   An array of entity types that support content translation.
     */
    public function getSupportedEntityTypes();
    
    /**
     * Checks whether an entity type supports translation.
     *
     * @param string $entity_type_id
     *   The entity type.
     *
     * @return bool
     *   TRUE if an entity type is supported, FALSE otherwise.
     */
    public function isSupported($entity_type_id);
    
    /**
     * Returns an instance of the Content translation handler.
     *
     * @param string $entity_type_id
     *   The type of the entity being translated.
     *
     * @return \Drupal\content_translation\ContentTranslationHandlerInterface
     *   An instance of the content translation handler.
     */
    public function getTranslationHandler($entity_type_id);
    
    /**
     * Returns an instance of the Content translation metadata.
     *
     * @param \Drupal\Core\Entity\EntityInterface $translation
     *   The entity translation whose metadata needs to be retrieved.
     *
     * @return \Drupal\content_translation\ContentTranslationMetadataWrapperInterface
     *   An instance of the content translation metadata.
     */
    public function getTranslationMetadata(EntityInterface $translation);
    
    /**
     * Sets the value for translatability of the given entity type bundle.
     *
     * @param string $entity_type_id
     *   The entity type.
     * @param string $bundle
     *   The bundle of the entity.
     * @param bool $value
     *   The boolean value we need to save.
     */
    public function setEnabled($entity_type_id, $bundle, $value);
    
    /**
     * Determines whether the given entity type is translatable.
     *
     * @param string $entity_type_id
     *   The type of the entity.
     * @param string $bundle
     *   (optional) The bundle of the entity. If no bundle is provided, all the
     *   available bundles are checked.
     *
     * @return bool
     *   TRUE if the specified bundle is translatable. If no bundle is provided
     *   returns TRUE if at least one of the entity bundles is translatable.
     */
    public function isEnabled($entity_type_id, $bundle = NULL);

}