KjwUtil.php

<?php // vim:ts=4:sw=4:noet
/*====================================================================== 
Copyright (C) 2006-2009, Walter Doekes
This file is part of KjwLib-php45.
 
KjwLib-php45 is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published by 
the Free Software Foundation, either version 3 of the License, or 
(at your option) any later version. 

KjwLib-php45 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.  See the 
GNU General Public License for more details. 

You should have received a copy of the GNU General Public License 
along with KjwLib-php45.  If not, see <http://www.gnu.org/licenses/>. 
======================================================================*/

class KjwUtil {
        function &getSingleton($className) {
                static $instances = array();  // array of instance names
                assert(is_string($className));
                if (!array_key_exists($className, $instances)) {
                        // instance does not exist, so create it
                        if (file_exists(dirname(__FILE__) . "/$className.php"))
                                require_once(dirname(__FILE__) . "/$className.php");
                        // * call_user_func doesn't let me create new objects.., that's not cool
                        //   so, no call_user_func here
                        // * func_get_args() returns the variables by value, instead of by reference
                        //   so, if you want to pass references, you're out of luck :(
                        $a = &func_get_args();
                        switch (func_num_args() - 1) {
                        case 0: $instances[$className] = new $className(); break;
                        case 1: $instances[$className] = new $className(&$a[1]); break;
                        case 2: $instances[$className] = new $className(&$a[1],&$a[2]); break;
                        case 3: $instances[$className] = new $className(&$a[1],&$a[2],&$a[3]); break;
                        case 4: $instances[$className] = new $className(&$a[1],&$a[2],&$a[3],&$a[4]); break;
                        case 5: $instances[$className] = new $className(&$a[1],&$a[2],&$a[3],&$a[4],&$a[5]); break;
                        case 6: $instances[$className] = new $className(&$a[1],&$a[2],&$a[3],&$a[4],&$a[5],&$a[6]); break;
                        default: trigger_error('KjwSingleton: too many arguments for getInstance.', E_USER_ERROR);
                        }
                }
                return $instances[$className];
        }
}

?>

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