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)
        function &getIdentifier_Ids()
        {
                include_once 'Services/MetaData/classes/class.ilMDIdentifier_.php';

                return ilMDIdentifier_::_getIds($this->getRBACId(),$this->getObjId(),$this->getMetaId(),'meta_relation');
        }
        function &getIdentifier_($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;
        }
        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;
        }

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

                return ilMdDescription::_getIds($this->getRBACId(),$this->getObjId(),$this->getMetaId(),'meta_relation');
        }
        function &getDescription($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;
        }
        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 $des;
        }
        // SET/GET
        function setKind($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;
                }
        }
        function getKind()
        {
                return $this->kind;
        }


        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;
        }

        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;
        }

        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;
        }
                        

        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()));
        }

        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
         * 
         */
        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
        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();
        }
}
?>