class IconExtractorPluginManager

class IconExtractorPluginManager extends DefaultPluginManager {
    public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler, PluginFormFactoryInterface $pluginFormFactory) {
        parent::__construct('Plugin/IconExtractor', $namespaces, $module_handler, IconExtractorInterface::class, IconExtractor::class);
        $this->alterInfo('icon_extractor_info');
        $this->setCacheBackend($cache_backend, 'icon_extractor_plugins');
    }
    
    /**
     * Get multiple extractor settings form.
     *
     * @param array $icon_pack_configurations
     *   All the icon pack configurations containing the extractor.
     *
     * @return \Drupal\Core\Plugin\PluginFormInterface[]
     *   The extractor form indexed by extractor id.
     */
    public function getExtractorForms(array $icon_pack_configurations) : array {
        $extractor_forms = [];
        foreach ($icon_pack_configurations as $icon_pack_configuration) {
            $pack_id = $icon_pack_configuration['id'];
            $form = $this->getExtractorForm($icon_pack_configuration);
            if (NULL === $form) {
                continue;
            }
            $extractor_forms[$pack_id] = $form;
        }
        return $extractor_forms;
    }
    
    /**
     * Get an extractor settings form.
     *
     * @param array $icon_pack_configuration
     *   The extractor configuration.
     *
     * @return \Drupal\Core\Plugin\PluginFormInterface|null
     *   The extractor form or null.
     */
    public function getExtractorForm(array $icon_pack_configuration) : ?PluginFormInterface {
        if (!isset($icon_pack_configuration['settings'])) {
            return NULL;
        }
        
        /** @var \Drupal\Core\Theme\Icon\IconExtractorInterface $plugin */
        $plugin = $this->createInstance($icon_pack_configuration['extractor'], $icon_pack_configuration);
        return $this->getPluginForm($plugin);
    }
    
    /**
     * Retrieves the plugin form for a given icon extractor.
     *
     * @param \Drupal\Core\Theme\Icon\IconExtractorInterface $icon_extractor
     *   The ui icons extractor plugin.
     *
     * @return \Drupal\Core\Plugin\PluginFormInterface
     *   The plugin form for this plugin.
     */
    protected function getPluginForm(IconExtractorInterface $icon_extractor) : PluginFormInterface {
        if ($icon_extractor instanceof PluginWithFormsInterface) {
            return $this->pluginFormFactory
                ->createInstance($icon_extractor, 'settings');
        }
        return $icon_extractor;
    }

}