class.ilMDMetaMetadata.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 ilMDMetaMetadata extends ilMDBase
{

        function ilMDMetaMetadata($a_rbac_id = 0,$a_obj_id = 0,$a_obj_type = '')
        {
                parent::ilMDBase($a_rbac_id,
                                                 $a_obj_id,
                                                 $a_obj_type);
        }

        function getPossibleSubelements()
        {
                $subs['Identifier'] = 'meta_identifier';
                $subs['Contribute'] = 'meta_contribute';

                return $subs;
        }


        // SUBELEMENTS
        function &getIdentifierIds()
        {
                include_once 'Services/MetaData/classes/class.ilMDIdentifier.php';

                return ilMDIdentifier::_getIds($this->getRBACId(),$this->getObjId(),$this->getMetaId(),'meta_meta_data');
        }
        function &getIdentifier($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_meta_data');

                return $ide;
        }
        
        function &getContributeIds()
        {
                include_once 'Services/MetaData/classes/class.ilMDContribute.php';

                return ilMDContribute::_getIds($this->getRBACId(),$this->getObjId(),$this->getMetaId(),'meta_meta_data');
        }
        function &getContribute($a_contribute_id)
        {
                include_once 'Services/MetaData/classes/class.ilMDContribute.php';
                
                if(!$a_contribute_id)
                {
                        return false;
                }
                $con =& new ilMDContribute();
                $con->setMetaId($a_contribute_id);

                return $con;
        }
        function &addContribute()
        {
                include_once 'Services/MetaData/classes/class.ilMDContribute.php';

                $con =& new ilMDContribute($this->getRBACId(),$this->getObjId(),$this->getObjType());
                $con->setParentId($this->getMetaId());
                $con->setParentType('meta_meta_data');

                return $con;
        }



        // SET/GET
        function setMetaDataScheme($a_val)
        {
                $this->meta_data_scheme = $a_val;
        }
        function getMetaDataScheme()
        {
                // Fixed attribute
                return 'LOM v 1.0';
        }
        function setLanguage(&$lng_obj)
        {
                if(is_object($lng_obj))
                {
                        $this->language = $lng_obj;
                }
        }
        function &getLanguage()
        {
                return is_object($this->language) ? $this->language : false;
        }
        function getLanguageCode()
        {
                return is_object($this->language) ? $this->language->getLanguageCode() : false;
        }
        

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

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

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

                        foreach($this->getIdentifierIds() as $id)
                        {
                                $ide = $this->getIdentifier($id);
                                $ide->delete();
                        }
                
                        foreach($this->getContributeIds() as $id)
                        {
                                $con = $this->getContribute($id);
                                $con->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',$this->getObjType()),
                                         'meta_data_scheme'     => array('text',$this->getMetaDataScheme()),
                                         'language' => array('text',$this->getLanguageCode()));
        }

        function read()
        {
                global $ilDB;
                
                include_once 'Services/MetaData/classes/class.ilMDLanguageItem.php';


                if($this->getMetaId())
                {

                        $query = "SELECT * FROM il_meta_meta_data ".
                                "WHERE meta_meta_data_id = ".$ilDB->quote($this->getMetaId() ,'integer');

                
                        $res = $this->db->query($query);
                        while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                        {
                                $this->setRBACId($row->rbac_id);
                                $this->setObjId($row->obj_id);
                                $this->setObjType($row->obj_type);
                                $this->setMetaDataScheme($row->meta_data_scheme);
                                $this->setLanguage(new ilMDLanguageItem($row->language));
                        }
                        return true;
                }
                return false;
        }
                                
        /*
         * XML Export of all meta data
         * @param object (xml writer) see class.ilMD2XML.php
         * 
         */
        function toXML(&$writer)
        {
                if($this->getMetaDataScheme())
                {
                        $attr['MetadataScheme'] = $this->getMetaDataScheme();
                }
                if($this->getLanguageCode())
                {
                        $attr['Language'] = $this->getLanguageCode();
                }
                $writer->xmlStartTag('Meta-Metadata',$attr ? $attr : null);

                // ELEMENT IDENTIFIER
                $identifiers = $this->getIdentifierIds();
                foreach($identifiers as $id)
                {
                        $ide =& $this->getIdentifier($id);
                        $ide->toXML($writer);
                }
                if(!count($identifiers))
                {
                        include_once 'Services/Metadata/classes/class.ilMDIdentifier.php';
                        $ide = new ilMDIdentifier($this->getRBACId(),$this->getObjId());
                        $ide->toXML($writer);
                }
                
                // ELEMETN Contribute
                $contributes = $this->getContributeIds();
                foreach($contributes as $id)
                {
                        $con =& $this->getContribute($id);
                        $con->toXML($writer);
                }
                if(!count($contributes))
                {
                        include_once 'Services/MetaData/classes/class.ilMDContribute.php';
                        $con = new ilMDContribute($this->getRBACId(),$this->getObjId());
                        $con->toXML($writer);
                }

                $writer->xmlEndTag('Meta-Metadata');
        }

        // STATIC
        function _getId($a_rbac_id,$a_obj_id)
        {
                global $ilDB;

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

                $res = $ilDB->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        return $row->meta_meta_data_id;
                }
                return false;
        }
}
?>