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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Auth
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @category   Zend
  * @package    Zend_Auth
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Auth
 {
     /**
      * Singleton instance
      *
      * @var Zend_Auth
      */
     protected static $_instance = null;
 
     /**
      * Persistent storage handler
      *
      * @var Zend_Auth_Storage_Interface
      */
     protected $_storage = null;
 
     /**
      * Singleton pattern implementation makes "new" unavailable
      *
      * @return void
      */
     protected function __construct()
     {}
 
     /**
      * Singleton pattern implementation makes "clone" unavailable
      *
      * @return void
      */
     protected function __clone()
     {}
 
     /**
      * Returns an instance of Zend_Auth
      *
      * Singleton pattern implementation
      *
      * @return Zend_Auth Provides a fluent interface
      */
     public static function getInstance()
     {
         if (null === self::$_instance) {
             self::$_instance = new self();
         }
 
         return self::$_instance;
     }
 
     /**
      * Returns the persistent storage handler
      *
      * Session storage is used by default unless a different storage adapter has been set.
      *
      * @return Zend_Auth_Storage_Interface
      */
     public function getStorage()
     {
         if (null === $this->_storage) {
             /**
              * @see Zend_Auth_Storage_Session
              */
             // require_once 'Zend/Auth/Storage/Session.php';
             $this->setStorage(new Zend_Auth_Storage_Session());
         }
 
         return $this->_storage;
     }
 
     /**
      * Sets the persistent storage handler
      *
      * @param  Zend_Auth_Storage_Interface $storage
      * @return Zend_Auth Provides a fluent interface
      */
     public function setStorage(Zend_Auth_Storage_Interface $storage)
     {
         $this->_storage = $storage;
         return $this;
     }
 
     /**
      * Authenticates against the supplied adapter
      *
      * @param  Zend_Auth_Adapter_Interface $adapter
      * @return Zend_Auth_Result
      */
     public function authenticate(Zend_Auth_Adapter_Interface $adapter)
     {
         $result = $adapter->authenticate();
 
         /**
          * ZF-7546 - prevent multiple succesive calls from storing inconsistent results
          * Ensure storage has clean state
          */
         if ($this->hasIdentity()) {
             $this->clearIdentity();
         }
 
         if ($result->isValid()) {
             $this->getStorage()->write($result->getIdentity());
         }
 
         return $result;
     }
 
     /**
      * Returns true if and only if an identity is available from storage
      *
      * @return boolean
      */
     public function hasIdentity()
     {
         return !$this->getStorage()->isEmpty();
     }
 
     /**
      * Returns the identity from storage or null if no identity is available
      *
      * @return mixed|null
      */
     public function getIdentity()
     {
         $storage = $this->getStorage();
 
         if ($storage->isEmpty()) {
             return null;
         }
 
         return $storage->read();
     }
 
     /**
      * Clears the identity from persistent storage
      *
      * @return void
      */
     public function clearIdentity()
     {
         $this->getStorage()->clear();
     }
 }