class.ilContainerReference.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 ilContainerReference extends ilObject
{
        protected $db = null;
        protected $target_id = null;
        protected $target_ref_id = null;
        
        public function __construct($a_id = 0,$a_call_by_reference = true)
        {
                global $ilDB;

                parent::__construct($a_id,$a_call_by_reference);
        }
        
        public static function _lookupTargetId($a_obj_id)
        {
                global $ilDB;
                
                $query = "SELECT * FROM container_reference ".
                        "WHERE obj_id = ".$ilDB->quote($a_obj_id)." ";
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        return $row->target_obj_id;
                }
                return $a_obj_id;
        }
        
         public static function _lookupTargetRefId($a_obj_id)
         {
                global $ilDB;
                
                $query = "SELECT ref_id FROM object_reference obr ".
                        "JOIN container_reference cr ON obr.obj_id = cr.target_obj_id ".
                        "WHERE cr.obj_id = ".$ilDB->quote($a_obj_id);
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        return $row->ref_id;
                }
                return false;
         }
        
         public static function _lookupTargetTitle($a_obj_id)
         {
                global $ilDB;
                
                $query = "SELECT title FROM object_data od ".
                        "JOIN container_reference cr ON target_obj_id = od.obj_id ".
                        "WHERE cr.obj_id = ".$ilDB->quote($a_obj_id);
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        return $row->title;
                }
                return '';
         }
        
         public static function _lookupSourceId($a_target_id)
         {
                global $ilDB;
                
                $query = "SELECT * FROM container_reference ".
                        "WHERE target_obj_id = ".$ilDB->quote($a_target_id)." ";
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        return $row->obj_id;
                }
                return false;
         }
        
        public function getTargetId()
        {
                return $this->target_id;
        }
        
        
        public function setTargetId($a_target_id)
        {
                $this->target_id = $a_target_id;
        }
        
        public function setTargetRefId($a_id)
        {
                $this->target_ref_id = $a_id;
        }
        
        public function getTargetRefId()
        {
                return $this->target_ref_id;
        }
        
        public function read()
        {
                global $ilDB;
                
                parent::read();
                
                $query = "SELECT * FROM container_reference ".
                        "WHERE obj_id = ".$ilDB->quote($this->getId())." ";
                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $this->setTargetId($row->target_obj_id);
                }
                $ref_ids = ilObject::_getAllReferences($this->getTargetId());
                $this->setTargetRefId(current($ref_ids));
                
                $this->title = $this->lng->txt('reference_of').' '.ilObject::_lookupTitle($this->getTargetId());
                
        }
        
        public function update()
        {
                global $ilDB;
                
                parent::update();
                
                $query = "DELETE FROM container_reference ".
                        "WHERE obj_id = ".$ilDB->quote($this->getId())." ";
                $ilDB->query($query);
                
                $query = "INSERT INTO container_reference ".
                        "SET obj_id = ".$ilDB->quote($this->getId()).", ".
                        "target_obj_id = ".$ilDB->quote($this->getTargetId())." ";
                $ilDB->query($query);
        }
        
        public function delete()
        {
                global $ilDB;

                if(!parent::delete())
                {
                        return false;
                }

                $query = "DELETE FROM container_reference ".
                        "WHERE obj_id = ".$ilDB->quote($this->getId())." ";
                $ilDB->query($query);
                
                return true;
        }
        
        public function cloneObject($a_target_id,$a_copy_id = 0)
        {
                global $ilDB,$ilUser;
                
                $new_obj = parent::cloneObject($a_target_id,$a_copy_id);
                
                $query = "INSERT INTO container_reference ".
                        "SET obj_id = ".$ilDB->quote($new_obj->getId()).", ".
                        "target_obj_id = ".$ilDB->quote($this->getTargetId())." ";
                $ilDB->query($query);
        }
        
}

?>