Method preloadComponents

/**
 * Method to preload the Rules objects for all components.
 *
 * Note: This will only get the base permissions for the component.
 * e.g. it will get 'com_content', but not 'com_content.article.1' or
 * any more specific asset type rules.
 *
 * @return   array  Array of component names that were preloaded.
 *
 * @since    1.6
 */
protected static function preloadComponents()
{
    // If the components already been preloaded do nothing.
    if (isset(self::$preloadedAssetTypes['components'])) {
        return array();
    }
    !JDEBUG ?: Profiler::getInstance('Application')->mark('Before Access::preloadComponents (all components)');
    // Add root to asset names list.
    $components = array('root.1');
    // Add enabled components to asset names list.
    foreach (ComponentHelper::getComponents() as $component) {
        if ($component->enabled) {
            $components[] = $component->option;
        }
    }
    // Get the database connection object.
    $db = Factory::getDbo();
    // Get the asset info for all assets in asset names list.
    $query = $db->getQuery(true)->select($db->quoteName(array('id', 'name', 'rules', 'parent_id')))->from($db->quoteName('#__assets'))->whereIn($db->quoteName('name'), $components, ParameterType::STRING);
    // Get the Name Permission Map List
    $assets = $db->setQuery($query)->loadObjectList();
    $rootAsset = null;
    // First add the root asset and save it to preload memory and mark it as preloaded.
    foreach ($assets as &$asset) {
        if ((int) $asset->parent_id === 0) {
            $rootAsset = $asset;
            self::$rootAssetId = $asset->id;
            self::$preloadedAssetTypes[$asset->name] = true;
            self::$preloadedAssets[$asset->id] = $asset->name;
            self::$assetPermissionsParentIdMapping[$asset->name][$asset->id] = $asset;
            unset($asset);
            break;
        }
    }
    // Now create save the components asset tree to preload memory.
    foreach ($assets as $asset) {
        if (!isset(self::$assetPermissionsParentIdMapping[$asset->name])) {
            self::$assetPermissionsParentIdMapping[$asset->name] = array($rootAsset->id => $rootAsset, $asset->id => $asset);
            self::$preloadedAssets[$asset->id] = $asset->name;
        }
    }
    // Mark all components asset type as preloaded.
    self::$preloadedAssetTypes['components'] = true;
    !JDEBUG ?: Profiler::getInstance('Application')->mark('After Access::preloadComponents (all components)');
    return $components;
}