class.ilNavigationHistory.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/


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, $a_title = "")
        {
                if ($a_title == "" && $a_ref_id > 0)
                {
                        $obj_id = ilObject::_lookupObjId($a_ref_id);
                        if (ilObject::_exists($obj_id))
                        {
                                $a_title = ilObject::_lookupTitle($obj_id);
                        }
                }
                
                // remove ref id from stack, if existing
                foreach($this->items as $key => $item)
                {
                        if ($item["ref_id"] == $a_ref_id)
                        {
                                array_splice($this->items, $key, 1);
                                break;
                        }
                }
                
                $this->items = array_merge(
                        array(array("ref_id" => $a_ref_id, "link" => $a_link, "title" => $a_title,
                        "type" => $a_type)), $this->items);
                
                $items  = serialize($this->items);
                $_SESSION["il_nav_history"] = $items;
        }
        
        public function getItems()
        {
                global $tree;
                
                $items = array();
                
                foreach ($this->items as $it)
                {
                        if ($tree->isInTree($it["ref_id"]))
                        {
                                $items[] = $it;
                        }
                }
                
                return $items;
        }
}
?>