interface PluginSettingsInterface

interface PluginSettingsInterface extends PluginInspectionInterface, ThirdPartySettingsInterface {
    
    /**
     * Defines the default settings for this plugin.
     *
     * @return array
     *   A list of default settings, keyed by the setting name.
     */
    public static function defaultSettings();
    
    /**
     * Returns the array of settings, including defaults for missing settings.
     *
     * @return array
     *   The array of settings.
     */
    public function getSettings();
    
    /**
     * Returns the value of a setting, or its default value if absent.
     *
     * @param string $key
     *   The setting name.
     *
     * @return mixed
     *   The setting value.
     */
    public function getSetting($key);
    
    /**
     * Sets the settings for the plugin.
     *
     * @param array $settings
     *   The array of settings, keyed by setting names. Missing settings will be
     *   assigned their default values.
     *
     * @return $this
     */
    public function setSettings(array $settings);
    
    /**
     * Sets the value of a setting for the plugin.
     *
     * @param string $key
     *   The setting name.
     * @param mixed $value
     *   The setting value.
     *
     * @return $this
     */
    public function setSetting($key, $value);
    
    /**
     * Informs the plugin that some configuration it depends on will be deleted.
     *
     * This method allows plugins to keep their configuration up-to-date when a
     * dependency calculated with ::calculateDependencies() is removed. For
     * example, an entity view display contains a formatter having a setting
     * pointing to an arbitrary config entity. When that config entity is deleted,
     * this method is called by the view display to react to the dependency
     * removal by updating its configuration.
     *
     * This method must return TRUE if the removal event updated the plugin
     * configuration or FALSE otherwise.
     *
     * @param array $dependencies
     *   An array of dependencies that will be deleted keyed by dependency type.
     *   Dependency types are 'config', 'content', 'module' and 'theme'.
     *
     * @return bool
     *   TRUE if the plugin configuration has changed, FALSE if not.
     *
     * @see \Drupal\Core\Entity\EntityDisplayBase
     */
    public function onDependencyRemoval(array $dependencies);

}