course/classes/class.ilCourseWaitingList.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 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 ilCourseWaitingList
{
        var $db = null;
        var $course_id = 0;
        


        function ilCourseWaitingList($a_course_id)
        {
                global $ilDB;

                $this->db = $ilDB;
                $this->course_id = $a_course_id;

                $this->__read();
        }

        function getCourseId()
        {
                return $this->course_id;
        }

        function addToList($a_usr_id)
        {
                if($this->isOnList($a_usr_id))
                {
                        return false;
                }
                $query = "INSERT INTO crs_waiting_list ".
                        "SET obj_id = '".$this->getCourseId()."', ".
                        "usr_id = '".$a_usr_id."', ".
                        "sub_time = '".time()."'";

                $this->db->query($query);
                $this->__read();

                return false;
        }

        function updateSubscriptionTime($a_usr_id,$a_subtime)
        {
                $query = "UPDATE crs_waiting_list ".
                        "SET sub_time = '".ilUtil::prepareDBString($a_subtime)."' ".
                        "WHERE usr_id = '".ilUtil::prepareDBString($a_usr_id)."' ".
                        "AND obj_id = '".$this->getCourseId()."'";

                $this->db->query($query);

                return true;
        }

        function removeFromList($a_usr_id)
        {
                $query = "DELETE FROM crs_waiting_list ".
                        " WHERE obj_id = '".$this->getCourseId()."' ".
                        " AND usr_id = '".$a_usr_id."'";

                $this->db->query($query);
                $this->__read();

                return true;
        }

        function isOnList($a_usr_id)
        {       
                return isset($this->users[$a_usr_id]) ? true : false;
        }

        function getCountUsers()
        {
                return count($this->users);
        }

        function getPosition($a_usr_id)
        {
                return isset($this->users[$a_usr_id]) ? $this->users[$a_usr_id]['position'] : -1;
        }

        function getAllUsers()
        {
                return $this->users ? $this->users : array();
        }
        
        function getUser($a_usr_id)
        {
                return isset($this->users[$a_usr_id]) ? $this->users[$a_usr_id] : false;
        }


        // PRIVATE
        function __read()
        {
                $this->users = array();

                $query = "SELECT * FROM crs_waiting_list ".
                        "WHERE obj_id = '".$this->getCourseId()."' ORDER BY sub_time";

                $res = $this->db->query($query);
                $counter = 0;
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        ++$counter;
                        $this->users[$row->usr_id]['position']  = $counter;
                        $this->users[$row->usr_id]['time']              = $row->sub_time;
                        $this->users[$row->usr_id]['usr_id']    = $row->usr_id;

                }
                return true;
        }

        // Static
        function _deleteAll($a_course_id)
        {
                global $ilDB;

                $query = "DELETE FROM crs_waiting_list WHERE obj_id = '".$a_course_id."'";
                $ilDB->query($query);

                return true;
        }
        function _deleteUser($a_usr_id)
        {
                global $ilDB;

                $query = "DELETE FROM crs_waiting_list WHERE usr_id = '".$a_usr_id."'";
                $ilDB->query($query);

                return true;
        }
}
?>