system/libraries/Cache/Cache.php

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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2006 - 2012 EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 2.0
 * @filesource	
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter Caching Class 
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Core
 * @author		ExpressionEngine Dev Team
 * @link		
 */
class CI_Cache extends CI_Driver_Library {
	
	protected $valid_drivers 	= array(
		'cache_apc', 'cache_file', 'cache_memcached', 'cache_dummy'
	);

	protected $_cache_path		= NULL;		// Path of cache files (if file-based cache)
	protected $_adapter			= 'dummy';
	protected $_backup_driver;
	
	// ------------------------------------------------------------------------

	/**
	 * Constructor
	 *
	 * @param array
	 */
	public function __construct($config = array())
	{
		if ( ! empty($config))
		{
			$this->_initialize($config);
		}
	}

	// ------------------------------------------------------------------------

	/**
	 * Get 
	 *
	 * Look for a value in the cache.  If it exists, return the data 
	 * if not, return FALSE
	 *
	 * @param 	string