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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_Cache
  * @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    $Id$
  */
 
 
 /**
  * @package    Zend_Cache
  * @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_Cache
 {
 
     /**
      * Standard frontends
      *
      * @var array
      */
     public static $standardFrontends = array('Core', 'Output', 'Class', 'File', 'Function', 'Page');
 
     /**
      * Standard backends
      *
      * @var array
      */
     public static $standardBackends = array('File', 'Sqlite', 'Memcached', 'Libmemcached', 'Apc', 'ZendPlatform',
                                             'Xcache', 'TwoLevels', 'WinCache', 'ZendServer_Disk', 'ZendServer_ShMem');
 
     /**
      * Standard backends which implement the ExtendedInterface
      *
      * @var array
      */
     public static $standardExtendedBackends = array('File', 'Apc', 'TwoLevels', 'Memcached', 'Libmemcached', 'Sqlite', 'WinCache');
 
     /**
      * Only for backward compatibility (may be removed in next major release)
      *
      * @var array
      * @deprecated
      */
     public static $availableFrontends = array('Core', 'Output', 'Class', 'File', 'Function', 'Page');
 
     /**
      * Only for backward compatibility (may be removed in next major release)
      *
      * @var array
      * @deprecated
      */
     public static $availableBackends = array('File', 'Sqlite', 'Memcached', 'Libmemcached', 'Apc', 'ZendPlatform', 'Xcache', 'WinCache', 'TwoLevels');
 
     /**
      * Consts for clean() method
      */
     const CLEANING_MODE_ALL              = 'all';
     const CLEANING_MODE_OLD              = 'old';
     const CLEANING_MODE_MATCHING_TAG     = 'matchingTag';
     const CLEANING_MODE_NOT_MATCHING_TAG = 'notMatchingTag';
     const CLEANING_MODE_MATCHING_ANY_TAG = 'matchingAnyTag';
 
     /**
      * Factory
      *
      * @param mixed  $frontend        frontend name (string) or Zend_Cache_Frontend_ object
      * @param mixed  $backend         backend name (string) or Zend_Cache_Backend_ object
      * @param array  $frontendOptions associative array of options for the corresponding frontend constructor
      * @param array  $backendOptions  associative array of options for the corresponding backend constructor
      * @param boolean $customFrontendNaming if true, the frontend argument is used as a complete class name ; if false, the frontend argument is used as the end of "Zend_Cache_Frontend_[...]" class name
      * @param boolean $customBackendNaming if true, the backend argument is used as a complete class name ; if false, the backend argument is used as the end of "Zend_Cache_Backend_[...]" class name
      * @param boolean $autoload if true, there will no // require_once for backend and frontend (useful only for custom backends/frontends)
      * @throws Zend_Cache_Exception
      * @return Zend_Cache_Core|Zend_Cache_Frontend
      */
     public static function factory($frontend, $backend, $frontendOptions = array(), $backendOptions = array(), $customFrontendNaming = false, $customBackendNaming = false, $autoload = false)
     {
         if (is_string($backend)) {
             $backendObject = self::_makeBackend($backend, $backendOptions, $customBackendNaming, $autoload);
         } else {
             if ((is_object($backend)) && (in_array('Zend_Cache_Backend_Interface', class_implements($backend)))) {
                 $backendObject = $backend;
             } else {
                 self::throwException('backend must be a backend name (string) or an object which implements Zend_Cache_Backend_Interface');
             }
         }
         if (is_string($frontend)) {
             $frontendObject = self::_makeFrontend($frontend, $frontendOptions, $customFrontendNaming, $autoload);
         } else {
             if (is_object($frontend)) {
                 $frontendObject = $frontend;
             } else {
                 self::throwException('frontend must be a frontend name (string) or an object');
             }
         }
         $frontendObject->setBackend($backendObject);
         return $frontendObject;
     }
 
     /**
      * Backend Constructor
      *
      * @param string  $backend
      * @param array   $backendOptions
      * @param boolean $customBackendNaming
      * @param boolean $autoload
      * @return Zend_Cache_Backend
      */
     public static function _makeBackend($backend, $backendOptions, $customBackendNaming = false, $autoload = false)
     {
         if (!$customBackendNaming) {
             $backend  = self::_normalizeName($backend);
         }
         if (in_array($backend, Zend_Cache::$standardBackends)) {
             // we use a standard backend
             $backendClass = 'Zend_Cache_Backend_' . $backend;
             // security controls are explicit
             // require_once str_replace('_', DIRECTORY_SEPARATOR, $backendClass) . '.php';
         } else {
             // we use a custom backend
             if (!preg_match('~^[\w\\\\]+$~D', $backend)) {
                 Zend_Cache::throwException("Invalid backend name [$backend]");
             }
             if (!$customBackendNaming) {
                 // we use this boolean to avoid an API break
                 $backendClass = 'Zend_Cache_Backend_' . $backend;
             } else {
                 $backendClass = $backend;
             }
             if (!$autoload) {
                 $file = str_replace('_', DIRECTORY_SEPARATOR, $backendClass) . '.php';
                 if (!(self::_isReadable($file))) {
                     self::throwException("file $file not found in include_path");
                 }
                 // require_once $file;
             }
         }
         return new $backendClass($backendOptions);
     }
 
     /**
      * Frontend Constructor
      *
      * @param string  $frontend
      * @param array   $frontendOptions
      * @param boolean $customFrontendNaming
      * @param boolean $autoload
      * @return Zend_Cache_Core|Zend_Cache_Frontend
      */
     public static function _makeFrontend($frontend, $frontendOptions = array(), $customFrontendNaming = false, $autoload = false)
     {
         if (!$customFrontendNaming) {
             $frontend = self::_normalizeName($frontend);
         }
         if (in_array($frontend, self::$standardFrontends)) {
             // we use a standard frontend
             // For perfs reasons, with frontend == 'Core', we can interact with the Core itself
             $frontendClass = 'Zend_Cache_' . ($frontend != 'Core' ? 'Frontend_' : '') . $frontend;
             // security controls are explicit
             // require_once str_replace('_', DIRECTORY_SEPARATOR, $frontendClass) . '.php';
         } else {
             // we use a custom frontend
             if (!preg_match('~^[\w\\\\]+$~D', $frontend)) {
                 Zend_Cache::throwException("Invalid frontend name [$frontend]");
             }
             if (!$customFrontendNaming) {
                 // we use this boolean to avoid an API break
                 $frontendClass = 'Zend_Cache_Frontend_' . $frontend;
             } else {
                 $frontendClass = $frontend;
             }
             if (!$autoload) {
                 $file = str_replace('_', DIRECTORY_SEPARATOR, $frontendClass) . '.php';
                 if (!(self::_isReadable($file))) {
                     self::throwException("file $file not found in include_path");
                 }
                 // require_once $file;
             }
         }
         return new $frontendClass($frontendOptions);
     }
 
     /**
      * Throw an exception
      *
      * Note : for perf reasons, the "load" of Zend/Cache/Exception is dynamic
      * @param  string $msg  Message for the exception
      * @throws Zend_Cache_Exception
      */
     public static function throwException($msg, Exception $e = null)
     {
         // For perfs reasons, we use this dynamic inclusion
         // require_once 'Zend/Cache/Exception.php';
         throw new Zend_Cache_Exception($msg, 0, $e);
     }
 
     /**
      * Normalize frontend and backend names to allow multiple words TitleCased
      *
      * @param  string $name  Name to normalize
      * @return string
      */
     protected static function _normalizeName($name)
     {
         $name = ucfirst(strtolower($name));
         $name = str_replace(array('-', '_', '.'), ' ', $name);
         $name = ucwords($name);
         $name = str_replace(' ', '', $name);
         if (stripos($name, 'ZendServer') === 0) {
             $name = 'ZendServer_' . substr($name, strlen('ZendServer'));
         }
 
         return $name;
     }
 
     /**
      * Returns TRUE if the $filename is readable, or FALSE otherwise.
      * This function uses the PHP include_path, where PHP's is_readable()
      * does not.
      *
      * Note : this method comes from Zend_Loader (see #ZF-2891 for details)
      *
      * @param string   $filename
      * @return boolean
      */
     private static function _isReadable($filename)
     {
         if (!$fh = @fopen($filename, 'r', true)) {
             return false;
         }
         @fclose($fh);
         return true;
     }
 
 }