<?php
/*
 You may not change or alter any portion of this comment or credits
 of supporting developers from this source code or any supporting source code
 which is considered copyrighted (c) material of the original comment or credit authors.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/

/**
 * Factory Class for Xoops Database
 *
 * @copyright       The XOOPS project http://sourceforge.net/projects/xoops/
 * @license         http://www.fsf.org/copyleft/gpl.html GNU public license
 * @package         kernel
 * @subpackage      database
 * @since           1.0.0
 * @author          Kazumi Ono <onokazu@xoops.org>
 * @version         $Id: databasefactory.php 3945 2009-11-27 21:32:57Z trabis $
 */
defined('XOOPS_ROOT_PATH') or die('Restricted access');

/**
 * XoopsDatabaseFactory
 *
 * @package Kernel
 * @author Kazumi Ono <onokazu@xoops.org>
 * @copyright Copyright (c) 2009
 * @version $Id: databasefactory.php 3945 2009-11-27 21:32:57Z trabis $
 * @access public
 */
class XoopsDatabaseFactory
{
    /**
     * XoopsDatabaseFactory::XoopsDatabaseFactory()
     */
    function XoopsDatabaseFactory()
    {
    }

    /**
     * Get a reference to the only instance of database class and connects to DB
     *
     * if the class has not been instantiated yet, this will also take
     * care of that
     *
     * @static
     * @staticvar object  The only instance of database class
     * @return object Reference to the only instance of database class
     */
    function &getDatabaseConnection()
    {
        static $instance;
        if (!isset($instance)) {
            if (file_exists($file = XOOPS_ROOT_PATH . '/class/database/' . XOOPS_DB_TYPE . 'database.php')) {
                require_once $file;

                if (!defined('XOOPS_DB_PROXY')) {
                    $class = 'Xoops' . ucfirst(XOOPS_DB_TYPE) . 'DatabaseSafe';
                } else {
                    $class = 'Xoops' . ucfirst(XOOPS_DB_TYPE) . 'DatabaseProxy';
                }

                $xoopsPreload =& XoopsPreload::getInstance();
                $xoopsPreload->triggerEvent('core.class.database.databasefactory.connection', array(&$class));

                $instance = new $class();
                $instance->setLogger(XoopsLogger::getInstance());
                $instance->setPrefix(XOOPS_DB_PREFIX);
                if (!$instance->connect()) {
                    trigger_error('notrace:Unable to connect to database', E_USER_ERROR);
                }
            } else {
                trigger_error('notrace:Failed to load database of type: ' . XOOPS_DB_TYPE . ' in file: ' . __FILE__ . ' at line ' . __LINE__, E_USER_WARNING);
            }
        }
        return $instance;
    }

    /**
     * Gets a reference to the only instance of database class. Currently
     * only being used within the installer.
     *
     * @static
     * @staticvar object  The only instance of database class
     * @return object Reference to the only instance of database class
     */
    function &getDatabase()
    {
        static $database;
        if (!isset($database)) {
            if (file_exists($file = XOOPS_ROOT_PATH . '/class/database/' . XOOPS_DB_TYPE . 'database.php')) {
                include_once $file;
                if (!defined('XOOPS_DB_PROXY')) {
                    $class = 'Xoops' . ucfirst(XOOPS_DB_TYPE) . 'DatabaseSafe';
                } else {
                    $class = 'Xoops' . ucfirst(XOOPS_DB_TYPE) . 'DatabaseProxy';
                }
                unset($database);
                $database = new $class();
            } else {
                trigger_error('notrace:Failed to load database of type: ' . XOOPS_DB_TYPE . ' in file: ' . __FILE__ . ' at line ' . __LINE__, E_USER_WARNING);
            }
        }
        return $database;
    }
}

?>