class.arFactory.php

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<?php
require_once(dirname(__FILE__) . '/../Exception/class.arException.php');

class arFactory
{

    public static function getInstance($class_name, $primary_key = 0, $additional_arguments = array())
    {
        $ref = new ReflectionClass($class_name);
        if ($ref->isInstantiable()) {
            $obj = $ref->newInstanceArgs(array_merge(array( $primary_key ), $additional_arguments));
            if ($primary_key == 0) {
                $obj = clone($obj);
            }
        } else {
            throw new arException(arException::PRIVATE_CONTRUCTOR);
        }

        return $obj;
    }
}