class LocaleDefaultConfigStorage

class LocaleDefaultConfigStorage {
    
    /**
     * The storage instance for reading configuration data.
     *
     * @var \Drupal\Core\Config\StorageInterface
     */
    protected $configStorage;
    
    /**
     * The language manager.
     *
     * @var \Drupal\language\ConfigurableLanguageManagerInterface
     */
    protected $languageManager;
    
    /**
     * The storage instance for reading required default configuration data.
     *
     * @var \Drupal\Core\Config\StorageInterface
     */
    protected $requiredInstallStorage;
    
    /**
     * The storage instance for reading optional default configuration data.
     *
     * @var \Drupal\Core\Config\StorageInterface
     */
    protected $optionalInstallStorage;
    
    /**
     * Constructs a LocaleDefaultConfigStorage.
     *
     * @param \Drupal\Core\Config\StorageInterface $config_storage
     *   The storage object to use for reading configuration data.
     * @param \Drupal\language\ConfigurableLanguageManagerInterface $language_manager
     *   The language manager.
     * @param string $install_profile
     *   The current installation profile.
     */
    public function __construct(StorageInterface $config_storage, ConfigurableLanguageManagerInterface $language_manager, $install_profile) {
        $this->configStorage = $config_storage;
        $this->languageManager = $language_manager;
        $this->requiredInstallStorage = new ExtensionInstallStorage($this->configStorage, ExtensionInstallStorage::CONFIG_INSTALL_DIRECTORY, ExtensionInstallStorage::DEFAULT_COLLECTION, TRUE, $install_profile);
        $this->optionalInstallStorage = new ExtensionInstallStorage($this->configStorage, ExtensionInstallStorage::CONFIG_OPTIONAL_DIRECTORY, ExtensionInstallStorage::DEFAULT_COLLECTION, TRUE, $install_profile);
    }
    
    /**
     * Read a configuration from install storage or default languages.
     *
     * @param string $name
     *   Configuration object name.
     *
     * @return array
     *   Configuration data from install storage or default language.
     */
    public function read($name) {
        if ($this->requiredInstallStorage
            ->exists($name)) {
            return $this->requiredInstallStorage
                ->read($name);
        }
        elseif ($this->optionalInstallStorage
            ->exists($name)) {
            return $this->optionalInstallStorage
                ->read($name);
        }
        elseif (strpos($name, 'language.entity.') === 0) {
            // Simulate default languages as if they were shipped as default
            // configuration.
            $langcode = str_replace('language.entity.', '', $name);
            $predefined_languages = $this->languageManager
                ->getStandardLanguageList();
            if (isset($predefined_languages[$langcode])) {
                $data = $this->configStorage
                    ->read($name);
                $data['label'] = $predefined_languages[$langcode][0];
                return $data;
            }
        }
    }
    
    /**
     * Return the list of configuration in install storage and current languages.
     *
     * @return array
     *   List of configuration in install storage and current languages.
     */
    public function listAll() {
        $languages = $this->predefinedConfiguredLanguages();
        return array_unique(array_merge($this->requiredInstallStorage
            ->listAll(), $this->optionalInstallStorage
            ->listAll(), $languages));
    }
    
    /**
     * Get all configuration names and folders for a list of modules or themes.
     *
     * @param string $type
     *   Type of components: 'module' | 'theme' | 'profile'
     * @param array $list
     *   Array of theme or module names.
     *
     * @return array
     *   Configuration names provided by that component. In case of language
     *   module this list is extended with configured languages that have
     *   predefined names as well.
     */
    public function getComponentNames($type, array $list) {
        $names = array_unique(array_merge(array_keys($this->requiredInstallStorage
            ->getComponentNames($type, $list)), array_keys($this->optionalInstallStorage
            ->getComponentNames($type, $list))));
        if ($type == 'module' && in_array('language', $list)) {
            $languages = $this->predefinedConfiguredLanguages();
            $names = array_unique(array_merge($names, $languages));
        }
        return $names;
    }
    
    /**
     * Compute the list of configuration names that match predefined languages.
     *
     * @return array
     *   The list of configuration names that match predefined languages.
     */
    protected function predefinedConfiguredLanguages() {
        $names = $this->configStorage
            ->listAll('language.entity.');
        $predefined_languages = $this->languageManager
            ->getStandardLanguageList();
        foreach ($names as $id => $name) {
            $langcode = str_replace('language.entity.', '', $name);
            if (!isset($predefined_languages[$langcode])) {
                unset($names[$id]);
            }
        }
        return array_values($names);
    }

}