<?php
/**
 * @package     Joomla.Libraries
 * @subpackage  Language
 *
 * @copyright   Copyright (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('JPATH_PLATFORM') or die;

/**
 * Utitlity class for multilang
 *
 * @package     Joomla.Libraries
 * @subpackage  Language
 * @since       2.5.4
 */
class JLanguageMultilang
{
	/**
	 * Method to determine if the language filter plugin is enabled.
	 * This works for both site and administrator.
	 *
	 * @return  boolean  True if site is supporting multiple languages; false otherwise.
	 *
	 * @since   2.5.4
	 */
	public static function isEnabled()
	{
		// Flag to avoid doing multiple database queries.
		static $tested = false;

		// Status of language filter plugin.
		static $enabled = false;

		// Get application object.
		$app = JFactory::getApplication();

		// If being called from the front-end, we can avoid the database query.
		if ($app->isSite())
		{
			$enabled = $app->getLanguageFilter();
			return $enabled;
		}

		// If already tested, don't test again.
		if (!$tested)
		{
			// Determine status of language filter plug-in.
			$db = JFactory::getDBO();
			$query = $db->getQuery(true);

			$query->select('enabled');
			$query->from($db->quoteName('#__extensions'));
			$query->where($db->quoteName('type') . ' = ' . $db->quote('plugin'));
			$query->where($db->quoteName('folder') . ' = ' . $db->quote('system'));
			$query->where($db->quoteName('element') . ' = ' . $db->quote('languagefilter'));
			$db->setQuery($query);

			$enabled = $db->loadResult();
			$tested = true;
		}

		return $enabled;
	}
}
