<?php
class DAOFactory {
    private static $_instance = null;
    private static $_dbhost;
    private static $_user;
    private static $_password;
    private static $_dbname;
    private function __construct ( $host, $user, $pwd, $dbname ) {
        self::$_dbhaost = $host;
        self::$_user = $user;
        self::$_password = $pwd;
        self::$_dbname = $dbname;
    }
    public function clear() {
        self::$_instance = null;
    }
    public static function getInstance() {
     if ( is_null ( self::$_instance ) && func_num_args() == 4 ) {
         $host = func_get_arg ( 0 );
        $user = func_get_arg ( 1 );
        $pwd = func_get_arg ( 2 );
        $dbname = func_get_arg ( 3 );
     self::$_instance = new self ( $host, $user, $pwd, $dbname );
     }
     return self::$_instance;
    }
    public function createDAO ( $classname ) {
        switch ( strtoupper ( $classname ) ) {
            case 'SURVEY':
                include ( 'com/adcom/creativesurvey/surveydao.php' );
                return new surveyDAO ( self::$_dbhost, self::$_user, self::$_password, self::$_dbname );
                break;
            case 'CREATIVE':
                include ( 'com/adcom/creativesurvey/creativedao.php' );
                return new creativeDAO ( self::$_dbhost, self::$_user, self::$_password, self::$_dbname );
                break;
        }
    }
}
?>