class.ilMDRelation.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. |
    +-----------------------------------------------------------------------------+
*/


include_once 'class.ilMDBase.php';

class ilMDRelation extends ilMDBase
{
    // METHODS OF CHILD OBJECTS (Taxon)
    public function &getIdentifier_Ids()
    {
        include_once 'Services/MetaData/classes/class.ilMDIdentifier_.php';

        return ilMDIdentifier_::_getIds($this->getRBACId(), $this->getObjId(), $this->getMetaId(), 'meta_relation');
    }
    public function &getIdentifier_($a_identifier__id)
    {
        include_once 'Services/MetaData/classes/class.ilMDIdentifier_.php';

        if (!$a_identifier__id) {
            return false;
        }
        $ide = new ilMDIdentifier_();
        $ide->setMetaId($a_identifier__id);

        return $ide;
    }
    public function &addIdentifier_()
    {
        include_once 'Services/MetaData/classes/class.ilMDIdentifier_.php';

        $ide = new ilMDIdentifier_($this->getRBACId(), $this->getObjId(), $this->getObjType());
        $ide->setParentId($this->getMetaId());
        $ide->setParentType('meta_relation');

        return $ide;
    }

    public function &getDescriptionIds()
    {
        include_once 'Services/MetaData/classes/class.ilMDDescription.php';

        return ilMdDescription::_getIds($this->getRBACId(), $this->getObjId(), $this->getMetaId(), 'meta_relation');
    }
    public function &getDescription($a_description_id)
    {
        include_once 'Services/MetaData/classes/class.ilMDDescription.php';
        
        if (!$a_description_id) {
            return false;
        }
        $des = new ilMDDescription();
        $des->setMetaId($a_description_id);

        return $des;
    }
    public function &addDescription()
    {
        include_once 'Services/MetaData/classes/class.ilMDDescription.php';
        
        $des = new ilMDDescription($this->getRBACId(), $this->getObjId(), $this->getObjType());
        $des->setParentId($this->getMetaId());
        $des->setParentType('meta_relation');

        return $des;
    }
    // SET/GET
    public function setKind($a_kind)
    {
        switch ($a_kind) {
            case 'IsPartOf':
            case 'HasPart':
            case 'IsVersionOf':
            case 'HasVersion':
            case 'IsFormatOf':
            case 'HasFormat':
            case 'References':
            case 'IsReferencedBy':
            case 'IsBasedOn':
            case 'IsBasisFor':
            case 'Requires':
            case 'IsRequiredBy':
                $this->kind = $a_kind;
                return true;

            default:
                return false;
        }
    }
    public function getKind()
    {
        return $this->kind;
    }


    public function save()
    {
        global $ilDB;
        
        $fields = $this->__getFields();
        $fields['meta_relation_id'] = array('integer',$next_id = $ilDB->nextId('il_meta_relation'));
        
        if ($this->db->insert('il_meta_relation', $fields)) {
            $this->setMetaId($next_id);
            return $this->getMetaId();
        }
        return false;
    }

    public function update()
    {
        global $ilDB;
        
        if ($this->getMetaId()) {
            if ($this->db->update(
                'il_meta_relation',
                $this->__getFields(),
                array("meta_relation_id" => array('integer',$this->getMetaId()))
            )) {
                return true;
            }
        }
        return false;
    }

    public function delete()
    {
        global $ilDB;
        
        if ($this->getMetaId()) {
            $query = "DELETE FROM il_meta_relation " .
                "WHERE meta_relation_id = " . $ilDB->quote($this->getMetaId(), 'integer');
            $res = $ilDB->manipulate($query);

            foreach ($this->getIdentifier_Ids() as $id) {
                $ide = $this->getIdentifier_($id);
                $ide->delete();
            }
            foreach ($this->getDescriptionIds() as $id) {
                $des = $this->getDescription($id);
                $des->delete();
            }
            
            return true;
        }
        return false;
    }
            

    public function __getFields()
    {
        return array('rbac_id'  => array('integer',$this->getRBACId()),
                     'obj_id'   => array('integer',$this->getObjId()),
                     'obj_type' => array('text',$this->getObjType()),
                     'kind'             => array('text',$this->getKind()));
    }

    public function read()
    {
        global $ilDB;
        
        if ($this->getMetaId()) {
            $query = "SELECT * FROM il_meta_relation " .
                "WHERE meta_relation_id = " . $ilDB->quote($this->getMetaId(), 'integer');

            $res = $this->db->query($query);
            while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
                $this->setRBACId($row->rbac_id);
                $this->setObjId($row->obj_id);
                $this->setObjType($row->obj_type);
                $this->setKind($row->kind);
            }
        }
        return true;
    }

    /*
     * XML Export of all meta data
     * @param object (xml writer) see class.ilMD2XML.php
     *
     */
    public function toXML(&$writer)
    {
        $writer->xmlStartTag('Relation', array('Kind' => $this->getKind()
                                              ? $this->getKind()
                                              : 'IsPartOf'));
        $writer->xmlStartTag('Resource');

        // Identifier_
        $ides = $this->getIdentifier_Ids();
        foreach ($ides as $id) {
            $ide =&$this->getIdentifier_($id);
            $ide->toXML($writer);
        }
        if (!count($ides)) {
            include_once 'Services/MetaData/classes/class.ilMDIdentifier_.php';
            $ide = new ilMDIdentifier_($this->getRBACId(), $this->getObjId());
            $ide->toXML($writer);
        }

        // Description
        $dess = $this->getDescriptionIds();
        foreach ($dess as $id) {
            $des =&$this->getDescription($id);
            $des->toXML($writer);
        }
        if (!count($dess)) {
            include_once 'Services/MetaData/classes/class.ilMDDescription.php';
            $des = new ilMDDescription($this->getRBACId(), $this->getObjId());
            $des->toXML($writer);
        }

        $writer->xmlEndTag('Resource');
        $writer->xmlEndTag('Relation');
    }

                

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

        $query = "SELECT meta_relation_id FROM il_meta_relation " .
            "WHERE rbac_id = " . $ilDB->quote($a_rbac_id, 'integer') . " " .
            "AND obj_id = " . $ilDB->quote($a_obj_id, 'integer');

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