63      * @param string $user
66     protected function getUserFile($user)  argument
68         return $this->getStorePath() . '/' . rawurlencode($user) . '.json';
78      * @param string $user
82     public function loadUserData($user)  argument
84         $file = $this->getUserFile($user);
216      * @param string|null $user  defaults to the current user
219     public function getPreference($key, $user = null)  argument
226         if ($user === null) {
228             $user = $INPUT->server->str('REMOTE_USER');
230         if ($user === '') {
234         $data = $this->loadUserData($user);
247      * @param string $user
250     public function getRecord($key, $user)  argument
252         $data = $this->loadUserData($user);
269      * @param string $user    whose preferences are being written
273     public function setPreferences(array $values, $user, $actor)  argument
275         if ($user === '' || $user === null || $actor === '' || $actor === null) {
280         $file    = $this->getUserFile($user);
290         $data    = $this->loadUserData($user);