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<?php
/**
* This file is part of Stud.IP.
*
* 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.
*
* @author Moritz Strohm <strohm@data-quest.de>
* @copyright 2020
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
* @since 4.6
*/
/**
* This is a LibraryResultParser implementation for catalogs that
* use SRU.
*
* @see LibraryResultParser
*/
class SRULibraryResultParser implements LibraryResultParser
{
/**
* @see LibraryResultParser::readResultSet
*/
public function readResultSet($data = '') : array
{
$dom = new \DOMDocument();
$dom->loadXML($data);
$record_schema = $dom->getElementsByTagName('recordSchema')[0];
if (!$record_schema) {
//The recordSchema element is missing.
//We cannot continue.
return [];
}
if (strpos($record_schema->textContent, 'marcxml') !== false) {
$parser = new MarcxmlLibraryResultParser();
$result_set = [];
$collection_nodes = $dom->getElementsByTagName('collection');
if ($collection_nodes->length < 1) {
$collection_nodes = $dom->getElementsByTagName('records');
}
if ($collection_nodes->length > 0) {
foreach ($collection_nodes as $collection) {
if ($collection instanceof \DOMText) {
//Nothing we can do with text nodes.
continue;
}
foreach ($collection->getElementsByTagName('record') as $record) {
$document = $parser->readResultNode($record);
if ($document->getTitle()) {
$result_set[] = $document;
}
}
}
}
return $result_set;
}
throw new RuntimeException('only recordSchema marcxml implemented');
}
/**
* @see LibraryResultParser::readRecord
*/
public function readRecord($data = ''): LibraryDocument
{
$dom = new \DOMDocument();
@$dom->loadXML($data);
$record = $dom->getElementsByTagName('zs:record')[0];
if (!$record) {
//Wrong document type.
throw new Exception('Wrong document type!');
}
$record_schema = $record->getElementsByTagName('zs:recordSchema')[0];
if ($record_schema->textContent == 'marcxml') {
$record_node = $record->getElementsByTagName('record')[0];
if (!$record_node) {
throw new Exception('Invalid data!');
}
$parser = new MarcxmlLibraryResultParser();
$document = $parser->readResultNode($record);
if ($document->getTitle()) {
return $document;
}
}
throw new Exception('Could not read record');
}
}
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