Piwik\Plugin\Manager::getLoadedPlugin PHP Method

    public function getLoadedPlugin($name)
    {
        if (!isset($this->loadedPlugins[$name]) || is_null($this->loadedPlugins[$name])) {
            throw new \Exception("The plugin '{$name}' has not been loaded.");
        }
        return $this->loadedPlugins[$name];
    }

 private function getLoadedAndActivated($pluginName)
 {
     if (!$this->pluginManager->isPluginLoaded($pluginName)) {
         return;
     }
     try {
         if (!$this->pluginManager->isPluginActivated($pluginName)) {
             return;
         }
         $plugin = $this->pluginManager->getLoadedPlugin($pluginName);
     } catch (\Exception $e) {
         // we are not allowed to use possible settings from this plugin, plugin is not active
         return;
     }
     return $plugin;
 }