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.
     */
    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();
    }

}