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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Helper;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Cache\CacheControllerFactoryInterface;
use Joomla\CMS\Cache\Controller\CallbackController;
use Joomla\CMS\Cache\Exception\CacheExceptionInterface;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Log\Log;
use Joomla\Registry\Registry;

/**
 * Library helper class
 *
 * @since  3.2
 */
class LibraryHelper
{
	/**
	 * The component list cache
	 *
	 * @var    array
	 * @since  3.2
	 */
	protected static $libraries = array();

/**
	 * Get the library information.
	 *
	 * @param   string   $element  Element of the library in the extensions table.
	 * @param   boolean  $strict   If set and the library does not exist, the enabled attribute will be set to false.
	 *
	 * @return  \stdClass   An object with the library's information.
	 *
	 * @since   3.2
	 */
	public static function getLibrary($element, $strict = false)
	{
		// Is already cached?
		if (isset(static::$libraries[$element]) || static::loadLibrary($element))
		{
			$result = static::$libraries[$element];

// Convert the params to an object.
			if (\is_string($result->params))
			{
				$result->params = new Registry($result->params);
			}
		}
		else
		{
			$result = new \stdClass;
			$result->enabled = $strict ? false : true;
			$result->params = new Registry;
		}

return $result;
	}

/**
	 * Checks if a library is enabled
	 *
	 * @param   string  $element  Element of the library in the extensions table.
	 *
	 * @return  boolean
	 *
	 * @since   3.2
	 */
	public static function isEnabled($element)
	{
		return static::getLibrary($element, true)->enabled;
	}

/**
	 * Gets the parameter object for the library
	 *
	 * @param   string   $element  Element of the library in the extensions table.
	 * @param   boolean  $strict   If set and the library does not exist, false will be returned
	 *
	 * @return  Registry  A Registry object.
	 *
	 * @see     Registry
	 * @since   3.2
	 */
	public static function getParams($element, $strict = false)
	{
		return static::getLibrary($element, $strict)->params;
	}

/**
	 * Save the parameters object for the library
	 *
	 * @param   string    $element  Element of the library in the extensions table.
	 * @param   Registry  $params   Params to save
	 *
	 * @return  Registry  A Registry object.
	 *
	 * @see     Registry
	 * @since   3.2
	 */
	public static function saveParams($element, $params)
	{
		if (static::isEnabled($element))
		{
			// Save params in DB
			$db           = Factory::getDbo();
			$paramsString = $params->toString();
			$query        = $db->getQuery(true)
				->update($db->quoteName('#__extensions'))
				->set($db->quoteName('params') . ' = :params')
				->where($db->quoteName('type') . ' = ' . $db->quote('library'))
				->where($db->quoteName('element') . ' = :element')
				->bind(':params', $paramsString)
				->bind(':element', $element);
			$db->setQuery($query);

$result = $db->execute();

// Update params in libraries cache
			if ($result && isset(static::$libraries[$element]))
			{
				static::$libraries[$element]->params = $params;
			}

return $result;
		}

return false;
	}

/**
	 * Load the installed library into the libraries property.
	 *
	 * @param   string  $element  The element value for the extension
	 *
	 * @return  boolean  True on success
	 *
	 * @since   3.7.0
	 */
	protected static function loadLibrary($element)
	{
		$loader = function ($element)
		{
			$db = Factory::getDbo();
			$query = $db->getQuery(true)
				->select($db->quoteName(['extension_id', 'element', 'params', 'enabled'], ['id', 'option', null, null]))
				->from($db->quoteName('#__extensions'))
				->where($db->quoteName('type') . ' = ' . $db->quote('library'))
				->where($db->quoteName('element') . ' = :element')
				->bind(':element', $element);
			$db->setQuery($query);

return $db->loadObject();
		};

/** @var CallbackController $cache */
		$cache = Factory::getContainer()->get(CacheControllerFactoryInterface::class)->createCacheController('callback', ['defaultgroup' => '_system']);

try
		{
			static::$libraries[$element] = $cache->get($loader, array($element), __METHOD__ . $element);
		}
		catch (CacheExceptionInterface $e)
		{
			static::$libraries[$element] = $loader($element);
		}

if (empty(static::$libraries[$element]))
		{
			// Fatal error.
			$error = Text::_('JLIB_APPLICATION_ERROR_LIBRARY_NOT_FOUND');
			Log::add(Text::sprintf('JLIB_APPLICATION_ERROR_LIBRARY_NOT_LOADING', $element, $error), Log::WARNING, 'jerror');

return false;
		}

return true;
	}
}

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Name	Size	Perms	Modified	Actions
AuthenticationHelper.php	5.48 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
CMSHelper.php	3.16 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
ContentHelper.php	7.08 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
HelperFactory.php	1.11 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
HelperFactoryInterface.php	630 B	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
LibraryHelper.php	4.66 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
MediaHelper.php	14.62 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
ModuleHelper.php	18.93 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
RouteHelper.php	7.08 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
TagsHelper.php	30.14 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
UserGroupsHelper.php	5.81 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive

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