class AttachedAssets

class AttachedAssets implements AttachedAssetsInterface {
    
    /**
     * The (ordered) list of asset libraries attached to the current response.
     *
     * @var string[]
     */
    public $libraries = [];
    
    /**
     * The JavaScript settings attached to the current response.
     *
     * @var array
     */
    public $settings = [];
    
    /**
     * The set of asset libraries that the client has already loaded.
     *
     * @var string[]
     */
    protected $alreadyLoadedLibraries = [];
    
    /**
     * {@inheritdoc}
     */
    public static function createFromRenderArray(array $render_array) {
        if (!isset($render_array['#attached'])) {
            throw new \LogicException('The render array has not yet been rendered, hence not all attachments have been collected yet.');
        }
        $assets = new static();
        if (isset($render_array['#attached']['library'])) {
            $assets->setLibraries($render_array['#attached']['library']);
        }
        if (isset($render_array['#attached']['drupalSettings'])) {
            $assets->setSettings($render_array['#attached']['drupalSettings']);
        }
        return $assets;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setLibraries(array $libraries) {
        $this->libraries = array_unique($libraries);
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getLibraries() {
        return $this->libraries;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setSettings(array $settings) {
        $this->settings = $settings;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSettings() {
        return $this->settings;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getAlreadyLoadedLibraries() {
        return $this->alreadyLoadedLibraries;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setAlreadyLoadedLibraries(array $libraries) {
        $this->alreadyLoadedLibraries = $libraries;
        return $this;
    }

}