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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

* CodeIgniter

*

* An open source application development framework for PHP 5.1.6 or newer

*

* @package CodeIgniter

* @author ExpressionEngine Dev Team

* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.

* @license http://codeigniter.com/user_guide/license.html

* @link http://codeigniter.com

* @since Version 1.0

* @filesource

*/

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

/**

* Database Cache Class

*

* @category Database

* @author ExpressionEngine Dev Team

* @link http://codeigniter.com/user_guide/database/

*/

class CI_DB_Cache {

var $CI;

var $db; // allows passing of db object so that multiple database connections and returned db objects can be supported

/**

* Constructor

*

* Grabs the CI super object instance so we can access it.

*

*/

function CI_DB_Cache(&$db)

{

// Assign the main CI object to $this->CI

// and load the file helper since we use it a lot

$this->CI =& get_instance();

$this->db =& $db;

$this->CI->load->helper('file');

}

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

/**

* Set Cache Directory Path

*

* @access public

* @param string the path to the cache directory

* @return bool

*/

function check_path($path = '')

{

if ($path == '')

{

if ($this->db->cachedir == '')

{

return $this->db->cache_off();

}

$path = $this->db->cachedir;

}

// Add a trailing slash to the path if needed

$path = preg_replace("/(.+?)\/*$/", "\\1/", $path);

if ( ! is_dir($path) OR ! is_really_writable($path))

{

// If the path is wrong we'll turn off caching

return $this->db->cache_off();

}

$this->db->cachedir = $path;

return TRUE;

}

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

/**

* Retrieve a cached query

*

* The URI being requested will become the name of the cache sub-folder.

* An MD5 hash of the SQL statement will become the cache file name

*

* @access public

* @return string

*/

function read($sql)

{

if ( ! $this->check_path())

{

return $this->db->cache_off();

}

$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);

$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);

$filepath = $this->db->cachedir.$segment_one.'+'.$segment_two.'/'.md5($sql);

if (FALSE === ($cachedata = read_file($filepath)))

{

return FALSE;

}

return unserialize($cachedata);

}

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

/**

* Write a query to a cache file

*

* @access public

* @return bool

*/

function write($sql, $object)

{

if ( ! $this->check_path())

{

return $this->db->cache_off();

}

$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);

$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);

$dir_path = $this->db->cachedir.$segment_one.'+'.$segment_two.'/';

$filename = md5($sql);

if ( ! @is_dir($dir_path))

{

if ( ! @mkdir($dir_path, DIR_WRITE_MODE))

{

return FALSE;

}

@chmod($dir_path, DIR_WRITE_MODE);

}

if (write_file($dir_path.$filename, serialize($object)) === FALSE)

{

return FALSE;

}

@chmod($dir_path.$filename, FILE_WRITE_MODE);

return TRUE;

}

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

/**

* Delete cache files within a particular directory

*

* @access public

* @return bool

*/

function delete($segment_one = '', $segment_two = '')

{

if ($segment_one == '')

{

$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);

}

if ($segment_two == '')

{

$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);

}

$dir_path = $this->db->cachedir.$segment_one.'+'.$segment_two.'/';

delete_files($dir_path, TRUE);

}

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

/**

* Delete all existing cache files

*

* @access public

* @return bool

*/

function delete_all()

{

delete_files($this->db->cachedir, TRUE);

}

}

/* End of file DB_cache.php */

/* Location: ./system/database/DB_cache.php */