Horde_Registry::getApiInstance PHP Method

    public function getApiInstance($app, $type)
    {
        if (isset($this->_cache['ob'][$app][$type])) {
            return $this->_cache['ob'][$app][$type];
        }
        $path = $this->get('fileroot', $app) . '/lib';
        /* Set up autoload paths for the current application. This needs to
         * be done here because it is possible to try to load app-specific
         * libraries from other applications. */
        if (!isset($this->_cache['ob'][$app])) {
            $autoloader = $GLOBALS['injector']->getInstance('Horde_Autoloader');
            $app_mappers = array('Controller' => 'controllers', 'Helper' => 'helpers', 'SettingsExporter' => 'settings');
            $applicationMapper = new Horde_Autoloader_ClassPathMapper_Application($this->get('fileroot', $app) . '/app');
            foreach ($app_mappers as $key => $val) {
                $applicationMapper->addMapping($key, $val);
            }
            $autoloader->addClassPathMapper($applicationMapper);
            /* Skip horde, since this was already setup in core.php. */
            if ($app != 'horde') {
                $autoloader->addClassPathMapper(new Horde_Autoloader_ClassPathMapper_PrefixString($app, $path));
            }
        }
        $cname = Horde_String::ucfirst($type);
        /* Can't autoload here, since the application may not have been
         * initialized yet. */
        $classname = Horde_String::ucfirst($app) . '_' . $cname;
        $path = $path . '/' . $cname . '.php';
        if (file_exists($path)) {
            include_once $path;
        } else {
            $classname = __CLASS__ . '_' . $cname;
        }
        if (!class_exists($classname, false)) {
            throw new Horde_Exception("{$app} does not have an API");
        }
        $this->_cache['ob'][$app][$type] = $type == 'application' ? new $classname($app) : new $classname();
        return $this->_cache['ob'][$app][$type];
    }