class.ilNavigationHistory.php

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<?php

/* Copyright (c) 1998-2011 ILIAS open source, Extended GPL, see docs/LICENSE */


class ilNavigationHistory
{

        private $items;

        public function __construct()
        {
                $this->items = array();
                $items = null;
                if (isset($_SESSION["il_nav_history"]))
                {
                        $items = unserialize($_SESSION["il_nav_history"]);
                }
                if (is_array($items))
                {
                        $this->items = $items;
                }
        }

        public function addItem($a_ref_id, $a_link, $a_type, $a_title = "", $a_sub_obj_id = "",
                $a_goto_link = "")
        {
                global $ilUser, $ilDB;

                // never store?
                if ($ilUser->prefs["store_last_visited"] == 2)
                {
                        return;
                }
                
                $a_sub_obj_id = $a_sub_obj_id."";
                
                if ($a_title == "" && $a_ref_id > 0)
                {
                        $obj_id = ilObject::_lookupObjId($a_ref_id);
                        if (ilObject::_exists($obj_id))
                        {
                                $a_title = ilObject::_lookupTitle($obj_id);
                        }
                }

                $id = $a_ref_id.":".$a_sub_obj_id;

                $new_items[$id] = array("id" => $id,"ref_id" => $a_ref_id, "link" => $a_link, "title" => $a_title,
                        "type" => $a_type, "sub_obj_id" => $a_sub_obj_id, "goto_link" => $a_goto_link);
                
                $cnt = 1;
                foreach($this->items as $key => $item)
                {
                        if ($item["id"] != $id && $cnt <= 10)
                        {
                                $new_items[$item["id"]] = $item;
                                $cnt++;
                        }
                }
                
                // put items in session
                $this->items = $new_items;

                $items  = serialize($this->items);
                $_SESSION["il_nav_history"] = $items;
//var_dump($this->getItems());


                // only store in session?
                if ($ilUser->prefs["store_last_visited"] == 1)
                {
                        return;
                }


                // update entries in db
                $ilDB->update("usr_data",
                                array(
                                        "last_visited" => array("clob", serialize($this->getItems()))),
                                array(
                                "usr_id" => array("integer", $ilUser->getId()))
                        );
        }
        
        public function getItems()
        {
                global $tree, $ilDB, $ilUser;
                
                $items = array();
                
                foreach ($this->items as $it)
                {
                        if ($tree->isInTree($it["ref_id"]))
                        {
                                $items[$it["ref_id"].":".$it["sub_obj_id"]] = $it;
                        }
                }
                // less than 10? -> get items from db
                if (count($items) < 10 && $ilUser->getId() != ANONYMOUS_USER_ID)
                {
                        $set = $ilDB->query("SELECT last_visited FROM usr_data ".
                                " WHERE usr_id = ".$ilDB->quote($ilUser->getId(), "integer")
                                );
                        $rec  = $ilDB->fetchAssoc($set);
                        $db_entries = unserialize($rec["last_visited"]);
                        $cnt = count($items);
                        if (is_array($db_entries))
                        {
                                foreach ($db_entries as $rec)
                                {
                                        include_once("./Services/Link/classes/class.ilLink.php");
                                        
                                        if ($cnt <= 10 && ! isset($items[$rec["ref_id"].":".$rec["sub_obj_id"]]))
                                        {
                                                if ($tree->isInTree($rec["ref_id"]))
                                                {
                                                        $link = ($rec["goto_link"] != "")
                                                                ? $rec["goto_link"]
                                                                : ilLink::_getLink($rec["ref_id"]);
                                                        if ($rec["sub_obj_id"] != "")
                                                        {
                                                                $title = $rec["title"];
                                                        }
                                                        else
                                                        {
                                                                $title = ilObject::_lookupTitle(ilObject::_lookupObjId($rec["ref_id"]));
                                                        }
                                                        $items[$rec["ref_id"].":".$rec["sub_obj_id"]] = array("id" => $rec["ref_id"].":".$rec["sub_obj_id"],
                                                                "ref_id" => $rec["ref_id"], "link" => $link, "title" => $title,
                                                                "type" => $rec["type"], "sub_obj_id" => $rec["sub_obj_id"], "goto_link" => $rec["goto_link"]);
                                                        $cnt++;
                                                }
                                        }
                                }
                        }
                }
//var_dump($items);
                return $items;
        }
        
        function deleteDBEntries()
        {
                global $ilUser, $ilDB;
                
                // update entries in db
                $ilDB->update("usr_data",
                                array(
                                        "last_visited" => array("clob", serialize(array()))),
                                array(
                                "usr_id" => array("integer", $ilUser->getId()))
                        );
        }

        function deleteSessionEntries()
        {
                $_SESSION["il_nav_history"] = serialize(array());
        }

}
?>