<?php
    /**
     * @class  session
     * @author NHN (developers@xpressengine.com)
     * @brief session module's high class
     * @version 0.1
     *
     * The session management class
     **/

    class session extends ModuleObject {

        var $lifetime = 18000;
        var $session_started = false;

        function session() {
            if(Context::isInstalled()) $this->session_started= true;
        }

        /**
         * @brief Additional tasks required to accomplish during the installation
         **/
        function moduleInstall() {
            $oDB = &DB::getInstance();
            $oDB->addIndex("session","idx_session_update_mid", array("member_srl","last_update","cur_mid"));

            return new Object();
        }

        /**
         * @brief A method to check if the installation has been successful
         **/
        function checkUpdate() {
            $oDB = &DB::getInstance();
            if(!$oDB->isTableExists('session')) return true;
            if(!$oDB->isColumnExists("session","cur_mid")) return true;
            if(!$oDB->isIndexExists("session","idx_session_update_mid")) return true;
            return false;
        }

        /**
         * @brief Execute update
         **/
        function moduleUpdate() {
            $oDB = &DB::getInstance();
            $oModuleModel = &getModel('module');
            
            if(!$oDB->isTableExists('session')) $oDB->createTableByXmlFile($this->module_path.'schemas/session.xml');

            if(!$oDB->isColumnExists("session","cur_mid")) $oDB->addColumn('session',"cur_mid","varchar",128);

            if(!$oDB->isIndexExists("session","idx_session_update_mid")) $oDB->addIndex("session","idx_session_update_mid", array("member_srl","last_update","cur_mid"));
        }

        /**
         * @brief session string decode
         **/
        function unSerializeSession($val) {
            $vars = preg_split('/([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff^|]*)\|/', $val,-1,PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
            for($i=0; $vars[$i]; $i++) $result[$vars[$i++]] = unserialize($vars[$i]);
            return $result;
        }

        /**
         * @brief session string encode
         **/
        function serializeSession($data) {
            if(!count($data)) return;

            $str = '';
            foreach($data as $key => $val) $str .= $key.'|'.serialize($val);
            return substr($str, 0, strlen($str)-1).'}';
        }

        /**
         * @brief Re-generate the cache file
         **/
        function recompileCache() {
        }
    }
?>
