<?php /** * Zend Framework (http://framework.zend.com/) * * @link http://github.com/zendframework/zf2 for the canonical source repository * @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License */ namespace Zend\Authentication\Storage; interface StorageInterface { /** * Returns true if and only if storage is empty * * @throws \Zend\Authentication\Exception\ExceptionInterface If it is impossible to determine whether storage is empty * @return bool */ public function isEmpty(); /** * Returns the contents of storage * * Behavior is undefined when storage is empty. * * @throws \Zend\Authentication\Exception\ExceptionInterface If reading contents from storage is impossible * @return mixed */ public function read(); /** * Writes $contents to storage * * @param mixed $contents * @throws \Zend\Authentication\Exception\ExceptionInterface If writing $contents to storage is impossible * @return void */ public function write($contents); /** * Clears contents from storage * * @throws \Zend\Authentication\Exception\ExceptionInterface If clearing contents from storage is impossible * @return void */ public function clear(); }