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
{
    public function getPossibleSubelements()
    {
        $subs['Identifier'] = 'meta_identifier';
        $subs['Contribute'] = 'meta_contribute';
 
        return $subs;
    }
 
 
    // SUBELEMENTS
    public function &getIdentifierIds()
    {
        include_once 'Services/MetaData/classes/class.ilMDIdentifier.php';
 
        return ilMDIdentifier::_getIds($this->getRBACId(), $this->getObjId(), $this->getMetaId(), 'meta_meta_data');
    }
    public function &getIdentifier($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_meta_data');
 
        return $ide;
    }
    
    public function &getContributeIds()
    {
        include_once 'Services/MetaData/classes/class.ilMDContribute.php';
 
        return ilMDContribute::_getIds($this->getRBACId(), $this->getObjId(), $this->getMetaId(), 'meta_meta_data');
    }
    public function &getContribute($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;
    }
    public 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
    public function setMetaDataScheme($a_val)
    {
        $this->meta_data_scheme = $a_val;
    }
    public function getMetaDataScheme()
    {
        // Fixed attribute
        return 'LOM v 1.0';
    }
    public function setLanguage(&$lng_obj)
    {
        if (is_object($lng_obj)) {
            $this->language = $lng_obj;
        }
    }
    public function &getLanguage()
    {
        return is_object($this->language) ? $this->language : false;
    }
    public function getLanguageCode()
    {
        return is_object($this->language) ? $this->language->getLanguageCode() : false;
    }
    
 
    public 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;
    }
 
    public 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;
    }
 
    public 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;
    }
            
 
    public 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()));
    }
 
    public 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(ilDBConstants::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
     *
     */
    public 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
    public 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(ilDBConstants::FETCHMODE_OBJECT)) {
            return $row->meta_meta_data_id;
        }
        return false;
    }
}