class SectionStorageBase

abstract class SectionStorageBase extends PluginBase implements SectionStorageInterface, TempStoreIdentifierInterface, CacheableDependencyInterface {
  use ContextAwarePluginTrait;
  use LayoutBuilderRoutesTrait;
  
  /**
   * Gets the section list.
   *
   * @return \Drupal\layout_builder\SectionListInterface
   *   The section list.
   */
  protected abstract 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();
  }

}