class SectionStorageBase

abstract class SectionStorageBase extends ContextAwarePluginBase implements SectionStorageInterface, TempStoreIdentifierInterface {
  use LayoutBuilderRoutesTrait;
  
  /**
   * Sets the section list on the storage.
   *
   * @param \Drupal\layout_builder\SectionListInterface $section_list
   *   The section list.
   *
   * @internal
   *   As of Drupal 8.7.0, this method should no longer be used. It previously
   *   should only have been used during storage instantiation.
   *
   * @throws \Exception
   *
   * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0. This
   *   method should no longer be used. The section list should be derived from
   *   context. See https://www.drupal.org/node/3016262.
   */
  public function setSectionList(SectionListInterface $section_list) {
    @trigger_error('\\Drupal\\layout_builder\\SectionStorageInterface::setSectionList() is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. This method should no longer be used. The section list should be derived from context. See https://www.drupal.org/node/3016262.', E_USER_DEPRECATED);
    throw new \Exception('\\Drupal\\layout_builder\\SectionStorageInterface::setSectionList() must no longer be called. The section list should be derived from context. See https://www.drupal.org/node/3016262.');
  }
  
  /**
   * Gets the section list.
   *
   * @return \Drupal\layout_builder\SectionListInterface
   *   The section list.
   */
  abstract protected function getSectionList();
  
  /**
   * {@inheritdoc}
   */
  public function getStorageType() {
    return $this->getPluginId();
  }
  
  /**
   * {@inheritdoc}
   */
  public function count() {
    return $this->getSectionList()
      ->count();
  }
  
  /**
   * {@inheritdoc}
   */
  public function getSections() {
    return $this->getSectionList()
      ->getSections();
  }
  
  /**
   * {@inheritdoc}
   */
  public function getSection($delta) {
    return $this->getSectionList()
      ->getSection($delta);
  }
  
  /**
   * {@inheritdoc}
   */
  public function appendSection(Section $section) {
    $this->getSectionList()
      ->appendSection($section);
    return $this;
  }
  
  /**
   * {@inheritdoc}
   */
  public function insertSection($delta, Section $section) {
    $this->getSectionList()
      ->insertSection($delta, $section);
    return $this;
  }
  
  /**
   * {@inheritdoc}
   */
  public function removeSection($delta) {
    $this->getSectionList()
      ->removeSection($delta);
    return $this;
  }
  
  /**
   * {@inheritdoc}
   */
  public function removeAllSections($set_blank = FALSE) {
    $this->getSectionList()
      ->removeAllSections($set_blank);
    return $this;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getContextsDuringPreview() {
    $contexts = $this->getContexts();
    // view_mode is a required context, but SectionStorage plugins are not
    // required to return it (for example, the layout_library plugin provided
    // in the Layout Library module. In these instances, explicitly create a
    // view_mode context with the value "default".
    if (!isset($contexts['view_mode']) || $contexts['view_mode']->validate()
      ->count() || !$contexts['view_mode']->getContextValue()) {
      $contexts['view_mode'] = new Context(new ContextDefinition('string'), 'default');
    }
    return $contexts;
  }
  
  /**
   * {@inheritdoc}
   */
  public function getTempstoreKey() {
    return $this->getStorageId();
  }

}