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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_Session
  * @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    $Id$
  * @since      Preview Release 0.2
  */
 
 
 /**
  * Zend_Session_Abstract
  *
  * @category   Zend
  * @package    Zend_Session
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 abstract class Zend_Session_Abstract
 {
     /**
      * Whether or not session permits writing (modification of $_SESSION[])
      *
      * @var bool
      */
     protected static $_writable = false;
 
     /**
      * Whether or not session permits reading (reading data in $_SESSION[])
      *
      * @var bool
      */
     protected static $_readable = false;
 
     /**
      * Since expiring data is handled at startup to avoid __destruct difficulties,
      * the data that will be expiring at end of this request is held here
      *
      * @var array
      */
     protected static $_expiringData = array();
 
 
     /**
      * Error message thrown when an action requires modification,
      * but current Zend_Session has been marked as read-only.
      */
     const _THROW_NOT_WRITABLE_MSG = 'Zend_Session is currently marked as read-only.';
 
 
     /**
      * Error message thrown when an action requires reading session data,
      * but current Zend_Session is not marked as readable.
      */
     const _THROW_NOT_READABLE_MSG = 'Zend_Session is not marked as readable.';
 
 
     /**
      * namespaceIsset() - check to see if a namespace or a variable within a namespace is set
      *
      * @param  string $namespace
      * @param  string $name
      * @return bool
      */
     protected static function _namespaceIsset($namespace, $name = null)
     {
         if (self::$_readable === false) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception(self::_THROW_NOT_READABLE_MSG);
         }
 
         if ($name === null) {
             return ( isset($_SESSION[$namespace]) || isset(self::$_expiringData[$namespace]) );
         } else {
             return ( isset($_SESSION[$namespace][$name]) || isset(self::$_expiringData[$namespace][$name]) );
         }
     }
 
 
     /**
      * namespaceUnset() - unset a namespace or a variable within a namespace
      *
      * @param  string $namespace
      * @param  string $name
      * @throws Zend_Session_Exception
      * @return void
      */
     protected static function _namespaceUnset($namespace, $name = null)
     {
         if (self::$_writable === false) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception(self::_THROW_NOT_WRITABLE_MSG);
         }
 
         $name = (string) $name;
 
         // check to see if the api wanted to remove a var from a namespace or a namespace
         if ($name === '') {
             unset($_SESSION[$namespace]);
             unset(self::$_expiringData[$namespace]);
         } else {
             unset($_SESSION[$namespace][$name]);
             unset(self::$_expiringData[$namespace][$name]);
         }
 
         // if we remove the last value, remove namespace.
         if (empty($_SESSION[$namespace])) {
             unset($_SESSION[$namespace]);
         }
     }
 
 
     /**
      * namespaceGet() - Get $name variable from $namespace, returning by reference.
      *
      * @param  string $namespace
      * @param  string $name
      * @return mixed
      */
     protected static function & _namespaceGet($namespace, $name = null)
     {
         if (self::$_readable === false) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception(self::_THROW_NOT_READABLE_MSG);
         }
 
         if ($name === null) {
             if (isset($_SESSION[$namespace])) { // check session first for data requested
                 return $_SESSION[$namespace];
             } elseif (isset(self::$_expiringData[$namespace])) { // check expiring data for data reqeusted
                 return self::$_expiringData[$namespace];
             } else {
                 return $_SESSION[$namespace]; // satisfy return by reference
             }
         } else {
             if (isset($_SESSION[$namespace][$name])) { // check session first
                 return $_SESSION[$namespace][$name];
             } elseif (isset(self::$_expiringData[$namespace][$name])) { // check expiring data
                 return self::$_expiringData[$namespace][$name];
             } else {
                 return $_SESSION[$namespace][$name]; // satisfy return by reference
             }
         }
     }
 
 
     /**
      * namespaceGetAll() - Get an array containing $namespace, including expiring data.
      *
      * @param string $namespace
      * @param string $name
      * @return mixed
      */
     protected static function _namespaceGetAll($namespace)
     {
         $currentData  = (isset($_SESSION[$namespace]) && is_array($_SESSION[$namespace])) ?
             $_SESSION[$namespace] : array();
         $expiringData = (isset(self::$_expiringData[$namespace]) && is_array(self::$_expiringData[$namespace])) ?
             self::$_expiringData[$namespace] : array();
         return array_merge($currentData, $expiringData);
     }
 }