class ConfigEntityAdapter

class ConfigEntityAdapter extends EntityAdapter {
    
    /**
     * The wrapped entity object.
     *
     * @var \Drupal\Core\Config\Entity\ConfigEntityInterface
     */
    protected $entity;
    
    /**
     * The typed config manager.
     *
     * @var \Drupal\Core\Config\TypedConfigManagerInterface
     */
    protected $typedConfigManager;
    
    /**
     * {@inheritdoc}
     */
    public function get($property_name) {
        if (!isset($this->entity)) {
            throw new MissingDataException("Unable to get property {$property_name} as no entity has been provided.");
        }
        return $this->getConfigTypedData()
            ->get($property_name);
    }
    
    /**
     * {@inheritdoc}
     */
    public function set($property_name, $value, $notify = TRUE) {
        if (!isset($this->entity)) {
            throw new MissingDataException("Unable to set property {$property_name} as no entity has been provided.");
        }
        $this->entity
            ->set($property_name, $value, $notify);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getProperties($include_computed = FALSE) {
        if (!isset($this->entity)) {
            throw new MissingDataException('Unable to get properties as no entity has been provided.');
        }
        return $this->getConfigTypedData()
            ->getProperties($include_computed);
    }
    
    /**
     * {@inheritdoc}
     */
    public function onChange($property_name) {
        if (isset($this->entity)) {
            // Let the entity know of any changes.
            $this->getConfigTypedData()
                ->onChange($property_name);
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIterator() {
        if (isset($this->entity)) {
            return $this->getConfigTypedData()
                ->getIterator();
        }
        return new \ArrayIterator([]);
    }
    
    /**
     * Gets the typed config manager.
     *
     * @return \Drupal\Core\Config\TypedConfigManagerInterface
     *   The typed config manager.
     */
    protected function getTypedConfigManager() {
        if (empty($this->typedConfigManager)) {
            // Use the typed data manager if it is also the typed config manager.
            // @todo Remove this in https://www.drupal.org/node/3011137.
            $typed_data_manager = $this->getTypedDataManager();
            if ($typed_data_manager instanceof TypedConfigManagerInterface) {
                $this->typedConfigManager = $typed_data_manager;
            }
            else {
                $this->typedConfigManager = \Drupal::service('config.typed');
            }
        }
        return $this->typedConfigManager;
    }
    
    /**
     * {@inheritdoc}
     *
     * @todo Remove this in https://www.drupal.org/node/3011137.
     */
    public function getTypedDataManager() {
        if (empty($this->typedDataManager)) {
            $this->typedDataManager = \Drupal::service('config.typed');
        }
        return $this->typedDataManager;
    }
    
    /**
     * {@inheritdoc}
     *
     * @todo Remove this in https://www.drupal.org/node/3011137.
     */
    public function setTypedDataManager(TypedDataManagerInterface $typed_data_manager) {
        $this->typedDataManager = $typed_data_manager;
        if ($typed_data_manager instanceof TypedConfigManagerInterface) {
            $this->typedConfigManager = $typed_data_manager;
        }
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function applyDefaultValue($notify = TRUE) {
        // @todo Figure out what to do for this method, see
        //   https://www.drupal.org/project/drupal/issues/2945635.
        throw new \BadMethodCallException('Method not supported');
    }
    
    /**
     * Gets typed data for config entity.
     *
     * @return \Drupal\Core\TypedData\ComplexDataInterface
     *   The typed data.
     */
    protected function getConfigTypedData() {
        return $this->getTypedConfigManager()
            ->createFromNameAndData($this->entity
            ->getConfigDependencyName(), $this->entity
            ->toArray());
    }

}