trait ExtensionListTrait

trait ExtensionListTrait {
    
    /**
     * Static version of the added file names during the installer.
     *
     * @var string[]
     *
     * @internal
     */
    protected static $staticAddedPathNames;
    
    /**
     * @see \Drupal\Core\Extension\ExtensionList::setPathname()
     */
    public function setPathname($extension_name, $pathname) {
        parent::setPathname($extension_name, $pathname);
        // In the early installer the container is rebuilt multiple times. Therefore
        // we have to keep the added filenames across those rebuilds. This is not a
        // final design, but rather just a workaround resolved at some point,
        // hopefully.
        // @todo Remove as part of https://drupal.org/project/drupal/issues/2934063
        static::$staticAddedPathNames[$extension_name] = $pathname;
    }
    
    /**
     * @see \Drupal\Core\Extension\ExtensionList::getPathname()
     */
    public function getPathname($extension_name) {
        if (isset($this->addedPathNames[$extension_name])) {
            return $this->addedPathNames[$extension_name];
        }
        elseif (isset($this->pathNames[$extension_name])) {
            return $this->pathNames[$extension_name];
        }
        elseif (isset(static::$staticAddedPathNames[$extension_name])) {
            return static::$staticAddedPathNames[$extension_name];
        }
        elseif (($path_names = $this->getPathnames()) && isset($path_names[$extension_name])) {
            // Ensure we don't have to do path scanning more than really needed.
            foreach ($path_names as $extension => $path_name) {
                static::$staticAddedPathNames[$extension] = $path_name;
            }
            return $path_names[$extension_name];
        }
        throw new \InvalidArgumentException("The {$this->type} {$extension_name} does not exist.");
    }

}