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() : int {
        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();
    }

}