class IconCollector

class IconCollector extends CacheCollector {
  
  /**
   * Constructs a IconCollector instance.
   *
   * @param \Drupal\Core\Theme\Icon\IconExtractorPluginManager $iconPackExtractorManager
   *   The icon plugin extractor service.
   * @param \Drupal\Core\Cache\CacheBackendInterface $cache
   *   The cache backend.
   * @param \Drupal\Core\Lock\LockBackendInterface $lock
   *   The lock backend.
   */
  public function __construct(protected readonly IconExtractorPluginManager $iconPackExtractorManager, CacheBackendInterface $cache, LockBackendInterface $lock) {
    parent::__construct('icon_info', $cache, $lock, [
      'icon_pack_collector',
    ]);
  }
  
  /**
   * {@inheritdoc}
   */
  public function set($key, $value) : void {
    $this->lazyLoadCache();
    $this->storage[$key] = $value;
    $this->persist($key);
    // Chances are very small but the key might have been marked for deletion.
    unset($this->keysToRemove[$key]);
  }
  
  /**
   * {@inheritdoc}
   */
  public function get($key, array $definition = []) : ?IconDefinitionInterface {
    $this->lazyLoadCache();
    if (\array_key_exists($key, $this->storage)) {
      return $this->storage[$key];
    }
    else {
      return $this->resolveCacheMiss($key, $definition);
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public function resolveCacheMiss($key, array $definition = []) : ?IconDefinitionInterface {
    $icon = $this->getIconFromExtractor($key, $definition);
    $this->storage[$key] = $icon;
    $this->persist($key);
    return $icon;
  }
  
  /**
   * Returns the icon from an icon id and icon pack definition.
   *
   * @param string $icon_full_id
   *   The icon full id as pack_id:icon_id.
   * @param array $definitions
   *   The icon pack definitions.
   *
   * @return \Drupal\Core\Theme\Icon\IconDefinitionInterface|null
   *   The icon loaded.
   */
  private function getIconFromExtractor(string $icon_full_id, array $definitions) : ?IconDefinitionInterface {
    $icon_data = IconDefinition::getIconDataFromId($icon_full_id);
    if (!isset($icon_data['pack_id'])) {
      return NULL;
    }
    $definition = $definitions[$icon_data['pack_id']] ?? NULL;
    if (NULL === $definition) {
      return NULL;
    }
    $icon_definition = $definition['icons'][$icon_full_id] ?? NULL;
    if (NULL === $icon_definition) {
      return NULL;
    }
    $icon_definition['icon_id'] = $icon_data['icon_id'];
    // Clean to data to reduce the array passed to createInstance().
    unset($definition['icons']);
    /** @var \Drupal\Core\Theme\Icon\IconExtractorInterface $extractor */
    $extractor = $this->iconPackExtractorManager
      ->createInstance($definition['extractor'], $definition);
    return $extractor->loadIcon($icon_definition);
  }

}