class.ilWaitingList.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. |
        +-----------------------------------------------------------------------------+
*/

abstract class ilWaitingList
{
        private $db = null;
        private $obj_id = 0;
        private $user_ids = array();
        private $users = array();
        
        static $is_on_list = array();


        public function __construct($a_obj_id)
        {
                global $ilDB;

                $this->db = $ilDB;
                $this->obj_id = $a_obj_id;

                $this->read();
        }
        
        public static function lookupListSize($a_obj_id)
        {
                global $ilDB;
                
                $query = 'SELECT count(usr_id) num from crs_waiting_list WHERE obj_id = '. $ilDB->quote($a_obj_id, 'integer');
                $res = $ilDB->query($query);
                
                while($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT))
                {
                        return (int) $row->num;
                }
                return 0;
        }
        
        public static function _deleteAll($a_obj_id)
        {
                global $ilDB;

                $query = "DELETE FROM crs_waiting_list WHERE obj_id = ".$ilDB->quote($a_obj_id ,'integer')." ";
                $res = $ilDB->manipulate($query);

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

                $query = "DELETE FROM crs_waiting_list WHERE usr_id = ".$ilDB->quote($a_usr_id ,'integer');
                $res = $ilDB->manipulate($query);

                return true;
        }
        
        public static function deleteUserEntry($a_usr_id, $a_obj_id)
        {
                global $ilDB;
                
                $query = "DELETE FROM crs_waiting_list ".
                        "WHERE usr_id = ".$ilDB->quote($a_usr_id,'integer').' '.
                        "AND obj_id = ".$ilDB->quote($a_obj_id,'integer');
                $ilDB->query($query);
                return true;
        }
        

        public function getObjId()
        {
                return $this->obj_id;
        }

        public function addToList($a_usr_id)
        {
                global $ilDB;
                
                if($this->isOnList($a_usr_id))
                {
                        return false;
                }
                $query = "INSERT INTO crs_waiting_list (obj_id,usr_id,sub_time) ".
                        "VALUES (".
                        $ilDB->quote($this->getObjId() ,'integer').", ".
                        $ilDB->quote($a_usr_id ,'integer').", ".
                        $ilDB->quote(time() ,'integer')." ".
                        ")";
                $res = $ilDB->manipulate($query);
                $this->read();

                return true;
        }

        public function updateSubscriptionTime($a_usr_id,$a_subtime)
        {
                global $ilDB;
                
                $query = "UPDATE crs_waiting_list ".
                        "SET sub_time = ".$ilDB->quote($a_subtime ,'integer')." ".
                        "WHERE usr_id = ".$ilDB->quote($a_usr_id ,'integer')." ".
                        "AND obj_id = ".$ilDB->quote($this->getObjId() ,'integer')." ";
                $res = $ilDB->manipulate($query);
                return true;
        }

        public function removeFromList($a_usr_id)
        {
                global $ilDB;
                
                $query = "DELETE FROM crs_waiting_list ".
                        " WHERE obj_id = ".$ilDB->quote($this->getObjId() ,'integer')." ".
                        " AND usr_id = ".$ilDB->quote($a_usr_id ,'integer')." ";
                $res = $ilDB->manipulate($query);
                $this->read();

                return true;
        }

        public function isOnList($a_usr_id)
        {
                return isset($this->users[$a_usr_id]) ? true : false;
        }
        
        public static function _isOnList($a_usr_id,$a_obj_id)
        {
                global $ilDB;
                
                if (isset(self::$is_on_list[$a_usr_id][$a_obj_id]))
                {
                        return self::$is_on_list[$a_usr_id][$a_obj_id];
                }
                
                $query = "SELECT usr_id ".
                        "FROM crs_waiting_list ".
                        "WHERE obj_id = ".$ilDB->quote($a_obj_id, 'integer')." ".
                        "AND usr_id = ".$ilDB->quote($a_usr_id, 'integer');
                $res = $ilDB->query($query);
                return $res->numRows() ? true : false;
        }
        
        static function _preloadOnListInfo($a_usr_ids, $a_obj_ids)
        {
                global $ilDB;
                
                if (!is_array($a_usr_ids))
                {
                        $a_usr_ids = array($a_usr_ids);
                }
                if (!is_array($a_obj_ids))
                {
                        $a_obj_ids = array($a_obj_ids);
                }
                foreach ($a_usr_ids as $usr_id)
                {
                        foreach ($a_obj_ids as $obj_id)
                        {
                                self::$is_on_list[$usr_id][$obj_id] = false;
                        }
                }
                $query = "SELECT usr_id, obj_id ".
                        "FROM crs_waiting_list ".
                        "WHERE ".
                        $ilDB->in("obj_id", $a_obj_ids, false, "integer")." AND ".
                        $ilDB->in("usr_id", $a_usr_ids, false, "integer");
                $res = $ilDB->query($query);
                while ($rec = $ilDB->fetchAssoc($res))
                {
                        self::$is_on_list[$rec["usr_id"]][$rec["obj_id"]] = true;
                }
        }
        

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

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


        private function read()
        {
                global $ilDB;
                
                $this->users = array();

                $query = "SELECT * FROM crs_waiting_list ".
                        "WHERE obj_id = ".$ilDB->quote($this->getObjId() ,'integer')." ORDER BY sub_time";

                $res = $this->db->query($query);
                $counter = 0;
                while($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT))
                {
                        ++$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;
                        
                        $this->user_ids[] = $row->usr_id;
                }
                return true;
        }

}
?>