<?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. |
    +-----------------------------------------------------------------------------+
*/


/**
* Meta Data class (element orComposite)
* Extends MDRequirement
*
* @package ilias-core
* @version $Id$
*/
include_once 'class.ilMDBase.php';
include_once 'Services/Migration/DBUpdate_426/classes/class.ilMDRequirement.php';

class ilMDOrComposite extends ilMDRequirement
{
    // SET/GET
    public function setOrCompositeId($a_or_composite_id)
    {
        $this->or_composite_id = (int) $a_or_composite_id;
    }
    public function getOrCompositeId()
    {
        global $ilDB;
        
        if (!$this->or_composite_id) {
            $query = "SELECT MAX(or_composite_id) AS orc FROM il_meta_requirement " .
                "WHERE rbac_id = " . $ilDB->quote($this->getRBACId()) . " " .
                "AND obj_id = " . $ilDB->quote($this->getObjId()) . " " .
                "GROUP BY or_composite_id";

            $res = $this->db->query($query);
            while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
                $this->or_composite_id = $row->orc;
            }
            ++$this->or_composite_id;
        }
        return $this->or_composite_id;
    }

    public function &getRequirementIds()
    {
        include_once 'Services/Migration/DBUpdate_426/classes/class.ilMDRequirement.php';

        return ilMDRequirement::_getIds(
            $this->getRBACId(),
            $this->getObjId(),
            $this->getParentId(),
            'meta_technical',
            $this->getOrCompositeId()
        );
    }

    public function &getRequirement($a_requirement_id)
    {
        include_once 'Services/Migration/DBUpdate_426/classes/class.ilMDRequirement.php';

        if (!$a_requirement_id) {
            return false;
        }
        $req = new ilMDRequirement();
        $req->setMetaId($a_requirement_id);

        return $req;
    }

    public function &addRequirement()
    {
        include_once 'Services/Migration/DBUpdate_426/classes/class.ilMDRequirement.php';

        $req = new ilMDRequirement($this->getRBACId(), $this->getObjId(), $this->getObjType());
        $req->setParentId($this->getParentId());
        $req->setParentType('meta_technical');
        $req->setOrCompositeId($this->getOrCompositeId());

        return $req;
    }

    /*
     * Overwritten save method, to get new or_composite_id
     *
     */
    public function save()
    {
        echo 'Use ilMDOrcomposite::addRequirement()';
    }

    public function delete()
    {
        foreach ($this->getRequirementIds() as $id) {
            $req = $this->getRequirement($id);
            $req->delete();
        }
        return true;
    }
                
    /*
     * XML Export of all meta data
     * @param object (xml writer) see class.ilMD2XML.php
     *
     */
    public function toXML(&$writer)
    {
        // For all requirements
        $writer->xmlStartTag('OrComposite');

        foreach ($this->getRequirementIds() as $id) {
            $req = $this->getRequirement($id);
            $req->toXML($writer);
        }
        $writer->xmlEndTag('OrComposite');
    }


    // STATIC
    public function _getIds($a_rbac_id, $a_obj_id, $a_parent_id, $a_parent_type)
    {
        global $ilDB;

        $query = "SELECT DISTINCT(or_composite_id) AS or_composite_id FROM il_meta_requirement " .
            "WHERE rbac_id = " . $ilDB->quote($a_rbac_id) . " " .
            "AND obj_id = " . $ilDB->quote($a_obj_id) . " " .
            "AND parent_id = " . $ilDB->quote($a_parent_id) . " " .
            "AND parent_type = " . $ilDB->quote($a_parent_type) . " " .
            "AND or_composite_id > 0 ";

        $res = $ilDB->query($query);
        while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
            $ids[] = $row->or_composite_id;
        }
        return $ids ? $ids : array();
    }
}