class.ilAdvancedMetaDataExporter.php

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<?php
/* Copyright (c) 1998-2010 ILIAS open source, Extended GPL, see docs/LICENSE */

include_once("./Services/Export/classes/class.ilXmlExporter.php");

class ilAdvancedMetaDataExporter extends ilXmlExporter
{
        private $ds;
        
        private static $local_recs_done = array();

        function init()
        {
                
        }

        function getXmlExportHeadDependencies($a_entity, $a_target_release, $a_ids)
        {
                return array();
        }


        function getXmlExportTailDependencies($a_entity, $a_target_release, $a_ids)
        {
                return array();
        }

        public function getXmlRepresentation($a_entity, $a_schema_version, $a_id)
        {                               
                $parts = explode(":", $a_id);
                if(sizeof($parts) != 2)
                {
                        return;
                }
                $obj_id = $parts[0];
                $rec_id = $parts[1];
                
                // any data for current record and object?
                include_once('Services/AdvancedMetaData/classes/class.ilAdvancedMDValues.php');
                $raw = ilAdvancedMDValues::findByObjectId($obj_id);
                if(!$raw)
                {
                        return;
                }
                
                // gather sub-item data from value entries
                $sub_items = array();
                foreach($raw as $item)
                {
                        $sub_items[$item["sub_type"]][] = $item["sub_id"];
                }
                
                // gather all relevant data
                $items = array();
                foreach($sub_items as $sub_type => $sub_ids)
                {                                               
                        foreach(array_unique($sub_ids) as $sub_id)
                        {
                                $values_record = new ilAdvancedMDValues($rec_id, $obj_id, $sub_type, $sub_id);
                                $defs = $values_record->getDefinitions();                       
                                $values_record->read();
                                foreach($values_record->getADTGroup()->getElements() as $element_id => $element)
                                {                                       
                                        if(!$element->isNull())
                                        {
                                                $def = $defs[$element_id];                                                      
                                                $items[$rec_id][] =array(
                                                        'id' => $def->generateImportId($def->getFieldId()),
                                                        'sub_type' => $sub_type,
                                                        'sub_id' => $sub_id,
                                                        'value' => $def->getValueForXML($element)
                                                );
                                        }                                       
                                }                               
                        }
                }
                
                // #17066 - local advmd record
                $local_recs = array();
                $rec_obj = new ilAdvancedMDRecord($rec_id);             
                if($rec_obj->getParentObject())
                {
                        $xml = new ilXmlWriter; 
                        $rec_obj->toXML($xml);
                        $xml = $xml->xmlDumpMem(false);
                        
                        $local_recs[$rec_obj->getRecordId()] = base64_encode($xml);                     
                }
                
                // we only want non-empty fields
                if(sizeof($items))
                {                       
                        $xml = new ilXmlWriter; 
                        
                        foreach($items as $record_id => $record_items)
                        {
                                $xml->xmlStartTag('AdvancedMetaData');
                                
                                $is_local = array_key_exists($record_id, $local_recs);

                                // add local record data?
                                if($is_local)
                                {
                                        // we need to add this only once
                                        if(!array_key_exists($record_id, self::$local_recs_done))
                                        {
                                                $xml->xmlElement(
                                                        'Record', 
                                                        array('local_id' => $record_id),
                                                        $local_recs[$record_id]
                                                );
                                                
                                                self::$local_recs_done[] = $record_id;
                                        }
                                }
                
                                foreach($record_items as $item)
                                {
                                        $att = array(
                                                'id' => $item['id'],
                                                'sub_type' => $item['sub_type'],
                                                'sub_id' => $item['sub_id']
                                        );
                                        
                                        if($is_local)
                                        {
                                                $att['local_rec_id'] = $record_id;
                                        }
                                        
                                        $xml->xmlElement(
                                                'Value',
                                                $att,
                                                $item['value']
                                        );
                                }
                                
                                $xml->xmlEndTag('AdvancedMetaData');    
                        }
                                                                        
                        return $xml->xmlDumpMem(false);
                }                                                               
        }       
        
        function getValidSchemaVersions($a_entity)
        {
                return array (
                        "4.4.0" => array(
                                "namespace" => "http://www.ilias.de/Services/AdvancedMetaData/advmd/4_4",
                                "xsd_file" => "ilias_advmd_4_4.xsd",
                                "uses_dataset" => true,
                                "min" => "4.4.0",
                                "max" => "")
                );
        }

}

?>