<?php
class Example_ACL
{
    public static function getActionValue($actionString)
    {
        switch ($actionString)
        {
            case 'none':
                return 0;
                break;
            case 'view':
                return 1;
                break;
            case 'create':
                return 2;
                break;
            case 'edit':
                return 3;
                break;
            case 'status':
                return 4;
                break;
            case 'delete':
                return 5;
                break;
            default:
                throw new Exception("Unknown Action", 500);
        }
    }
    public static function isAllowed(Example_Account_Record $user, $object, $action)
    {
        if (!in_array('Example_Permissionable', class_implements($object))) {
            throw new Exception('That class is not permissionable', 500);
        }

        $action = self::getActionValue($action);

        $method = "getNonOwnerPermission";
        if ($user->id == $object->owner_id) {
             $method= "getOwnerPermission";
        }

        $permission = 0;

        foreach($user->getGroups() as $group) {
             if ($groupPermission = $group->$method($object->getPermissionableClass(), $object->getScope($user)) >= $action) {
                  return true;
             }
        }

        return false;
    }
}