<?php



/**

 * XCache class

 */

if (!defined('W3TC')) {

    die();

}



require_once W3TC_LIB_W3_DIR . '/Cache/Base.php';



/**

 * Class W3_Cache_Xcache

 */

class W3_Cache_Xcache extends W3_Cache_Base {

    /**

     * Adds data

     *

     * @param string $key

     * @param mixed $var

     * @param integer $expire

     * @return boolean

     */

    function add($key, &$var, $expire = 0) {

        if ($this->get($key) === false) {

            return $this->set($key, $var, $expire);

        }



        return false;

    }



    /**

     * Sets data

     *

     * @param string $key

     * @param mixed $var

     * @param integer $expire

     * @return boolean

     */

    function set($key, &$var, $expire = 0) {

        return xcache_set($key, serialize($var), $expire);

    }



    /**

     * Returns data

     *

     * @param string $key

     * @return mixed

     */

    function get($key) {

        return @unserialize(xcache_get($key));

    }



    /**

     * Replaces data

     *

     * @param string $key

     * @param mixed $var

     * @param integer $expire

     * @return boolean

     */

    function replace($key, &$var, $expire = 0) {

        if ($this->get($key) !== false) {

            return $this->set($key, $var, $expire);

        }



        return false;

    }



    /**

     * Deletes data

     *

     * @param string $key

     * @return boolean

     */

    function delete($key) {

        return xcache_unset($key);

    }



    /**

     * Flushes all data

     *

     * @return boolean

     */

    function flush() {

        xcache_clear_cache(XC_TYPE_VAR, 0);



        return true;

    }

}