class.ilLMTree.php

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<?php

/* Copyright (c) 1998-2014 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilLMTree extends ilTree
{
        static $instances = array();

        private function __construct($a_tree_id)
        {
                parent::ilTree($a_tree_id);
                $this->setTableNames('lm_tree','lm_data');
                $this->setTreeTablePK("lm_id");
                $this->useCache(true);
        }

        static function getInstance($a_tree_id)
        {
                if (isset(self::$instances[$a_tree_id]))
                {
                        return self::$instances[$a_tree_id];
                }
                $tree = new ilLMTree($a_tree_id);
                self::$instances[$a_tree_id] = $tree;

                return $tree;
        }


        public function isCacheUsed()
        {
                return $this->use_cache;
        }

        
        public function getLastActivePage()
        {
                global $ilDB;
                
                $ilDB->setLimit(1);
                
                $sql = "SELECT lm_data.obj_id".
                        " FROM lm_data".
                        " JOIN lm_tree ON (lm_tree.child = lm_data.obj_id)".
                        " JOIN page_object ON (page_object.page_id = lm_data.obj_id AND page_object.parent_type = ".$ilDB->quote("lm", "text").")".
                        " WHERE lm_tree.lm_id = ".$ilDB->quote($this->tree_id, "integer").
                        " AND lm_data.type = ".$ilDB->quote("pg", "text").
                        " AND page_object.active = ".$ilDB->quote(1, "integer").
                        " ORDER BY lm_tree.rgt DESC";
                $set = $ilDB->query($sql);
                $row = $ilDB->fetchAssoc($set);         
                return (int)$row["obj_id"];
        }

}

?>