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Filename : Multilanguage.php
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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2012 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Language;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Factory;
use Joomla\Database\DatabaseInterface;

/**
 * Utility class for multilang
 *
 * @since  2.5.4
 */
class Multilanguage
{
	/**
	 * Flag indicating multilanguage functionality is enabled.
	 *
	 * @var    boolean
	 * @since  4.0.0
	 */
	public static $enabled = false;

	/**
	 * Method to determine if the language filter plugin is enabled.
	 * This works for both site and administrator.
	 *
	 * @param   CMSApplication     $app  The application
	 * @param   DatabaseInterface  $db   The database
	 *
	 * @return  boolean  True if site is supporting multiple languages; false otherwise.
	 *
	 * @since   2.5.4
	 */
	public static function isEnabled(CMSApplication $app = null, DatabaseInterface $db = null)
	{
		// Flag to avoid doing multiple database queries.
		static $tested = false;

		// Do not proceed with testing if the flag is true
		if (static::$enabled)
		{
			return true;
		}

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

		// If being called from the frontend, we can avoid the database query.
		if ($app->isClient('site'))
		{
			static::$enabled = $app->getLanguageFilter();

			return static::$enabled;
		}

		// If already tested, don't test again.
		if (!$tested)
		{
			// Determine status of language filter plugin.
			$db    = $db ?: Factory::getDbo();
			$query = $db->getQuery(true)
				->select($db->quoteName('enabled'))
				->from($db->quoteName('#__extensions'))
				->where(
					[
						$db->quoteName('type') . ' = ' . $db->quote('plugin'),
						$db->quoteName('folder') . ' = ' . $db->quote('system'),
						$db->quoteName('element') . ' = ' . $db->quote('languagefilter'),
					]
				);
			$db->setQuery($query);

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

		return static::$enabled;
	}

	/**
	 * Method to return a list of language home page menu items.
	 *
	 * @param   DatabaseInterface  $db  The database
	 *
	 * @return  array of menu objects.
	 *
	 * @since   3.5
	 */
	public static function getSiteHomePages(DatabaseInterface $db = null)
	{
		// To avoid doing duplicate database queries.
		static $multilangSiteHomePages = null;

		if (!isset($multilangSiteHomePages))
		{
			// Check for Home pages languages.
			$db    = $db ?: Factory::getDbo();
			$query = $db->getQuery(true)
				->select(
					[
						$db->quoteName('language'),
						$db->quoteName('id'),
					]
				)
				->from($db->quoteName('#__menu'))
				->where(
					[
						$db->quoteName('home') . ' = ' . $db->quote('1'),
						$db->quoteName('published') . ' = 1',
						$db->quoteName('client_id') . ' = 0',
					]
				);
			$db->setQuery($query);

			$multilangSiteHomePages = $db->loadObjectList('language');
		}

		return $multilangSiteHomePages;
	}
}