class ConfigurableLanguage

class ConfigurableLanguage extends ConfigEntityBase implements ConfigurableLanguageInterface {
    
    /**
     * The language ID (machine name).
     *
     * @var string
     */
    protected $id;
    
    /**
     * The human-readable label for the language.
     *
     * @var string
     */
    protected $label;
    
    /**
     * The direction of language, either DIRECTION_LTR or DIRECTION_RTL.
     *
     * @var int
     */
    protected $direction = self::DIRECTION_LTR;
    
    /**
     * The weight of the language, used in lists of languages.
     *
     * @var int
     */
    protected $weight = 0;
    
    /**
     * Locked languages cannot be edited.
     *
     * @var bool
     */
    protected $locked = FALSE;
    
    /**
     * Used during saving to detect when the site becomes multilingual.
     *
     * This property is not saved to the language entity, but is needed for
     * detecting when to rebuild the services.
     *
     * @see \Drupal\language\Entity\ConfigurableLanguage::preSave()
     * @see \Drupal\language\Entity\ConfigurableLanguage::postSave()
     *
     * @var bool
     */
    protected $preSaveMultilingual;
    
    /**
     * {@inheritdoc}
     */
    public function isDefault() {
        return static::getDefaultLangcode() == $this->id();
    }
    
    /**
     * {@inheritdoc}
     */
    public function isLocked() {
        return (bool) $this->locked;
    }
    
    /**
     * {@inheritdoc}
     */
    public function preSave(EntityStorageInterface $storage) {
        parent::preSave($storage);
        // Store whether or not the site is already multilingual so that we can
        // rebuild services if necessary during
        // \Drupal\language\Entity\ConfigurableLanguage::postSave().
        $this->preSaveMultilingual = \Drupal::languageManager()->isMultilingual();
    }
    
    /**
     * {@inheritdoc}
     */
    public function postSave(EntityStorageInterface $storage, $update = TRUE) {
        parent::postSave($storage, $update);
        $language_manager = \Drupal::languageManager();
        $language_manager->reset();
        if (!$this->isLocked() && $language_manager instanceof ConfigurableLanguageManagerInterface && !$this->isSyncing()) {
            $language_manager->updateLockedLanguageWeights();
        }
        // Update URL Prefixes for all languages after the
        // LanguageManagerInterface::getLanguages() cache is flushed.
        language_negotiation_url_prefixes_update();
        // If after adding this language the site will become multilingual, we need
        // to rebuild language services.
        if (!$this->preSaveMultilingual && !$update && $language_manager instanceof ConfigurableLanguageManagerInterface) {
            $language_manager::rebuildServices();
        }
        if (!$update) {
            // Install any available language configuration overrides for the language.
            \Drupal::service('language.config_factory_override')->installLanguageOverrides($this->id());
        }
        if (!$this->isLocked() && !$update) {
            // Add language to the list of language domains.
            $config = \Drupal::configFactory()->getEditable('language.negotiation');
            $domains = $config->get('url.domains');
            $domains[$this->id()] = '';
            $config->set('url.domains', $domains)
                ->save(TRUE);
        }
    }
    
    /**
     * {@inheritdoc}
     *
     * @throws \Drupal\language\Exception\DeleteDefaultLanguageException
     *   Exception thrown if we're trying to delete the default language entity.
     *   This is not allowed as a site must have a default language.
     */
    public static function preDelete(EntityStorageInterface $storage, array $entities) {
        $default_langcode = static::getDefaultLangcode();
        foreach ($entities as $entity) {
            if ($entity->id() == $default_langcode && !$entity->isUninstalling()) {
                throw new DeleteDefaultLanguageException('Can not delete the default language');
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function postDelete(EntityStorageInterface $storage, array $entities) {
        parent::postDelete($storage, $entities);
        $language_manager = \Drupal::languageManager();
        $language_manager->reset();
        $entity = reset($entities);
        if ($language_manager instanceof ConfigurableLanguageManagerInterface && !$entity->isUninstalling() && !$entity->isSyncing()) {
            $language_manager->updateLockedLanguageWeights();
        }
        // If after deleting this language the site will become monolingual, we need
        // to rebuild language services.
        if (!\Drupal::languageManager()->isMultilingual()) {
            ConfigurableLanguageManager::rebuildServices();
        }
        // Remove language from language prefix and domain list.
        $config = \Drupal::configFactory()->getEditable('language.negotiation');
        $config->clear('url.prefixes.' . $entity->id());
        $config->clear('url.domains.' . $entity->id());
        $config->save(TRUE);
    }
    
    /**
     * Gets the default langcode.
     *
     * @return string
     *   The current default langcode.
     */
    protected static function getDefaultLangcode() {
        $language = \Drupal::service('language.default')->get();
        return $language->getId();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getName() {
        return $this->label();
    }
    
    /**
     * {@inheritdoc}
     */
    public function setName($name) {
        $this->label = $name;
        return $this;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getId() {
        return $this->id();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDirection() {
        return $this->direction;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getWeight() {
        return $this->weight;
    }
    
    /**
     * {@inheritdoc}
     */
    public function setWeight($weight) {
        $this->weight = $weight;
        return $this;
    }
    
    /**
     * Creates a configurable language object from a langcode.
     *
     * @param string $langcode
     *   The language code to use to create the object.
     *
     * @return $this
     *
     * @see \Drupal\Core\Language\LanguageManager::getStandardLanguageList()
     */
    public static function createFromLangcode($langcode) {
        $standard_languages = LanguageManager::getStandardLanguageList();
        if (!isset($standard_languages[$langcode])) {
            // Drupal does not know about this language, so we set its values with the
            // best guess. The user will be able to edit afterwards.
            return static::create([
                'id' => $langcode,
                'label' => $langcode,
            ]);
        }
        else {
            // A known predefined language, details will be filled in properly.
            return static::create([
                'id' => $langcode,
                'label' => $standard_languages[$langcode][0],
                'direction' => $standard_languages[$langcode][2] ?? static::DIRECTION_LTR,
            ]);
        }
    }

}