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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 the BASE catalog.
*
* @see LibraryResultParser
*/
class BASELibraryResultParser implements LibraryResultParser
{
/**
* This is a helper method to index the child nodes of a node which makes
* accessing them easier. The index is like the "name" attribute
* of the DOM child node.
*
* @param DOMElement $node The node whose child nodes shall be indexed.
*
* @returns DOMElement[] An array of DOMElement nodes reperesenting
* the indexed child nodes of the supplied node.
*/
protected function indexChildren(\DOMElement $node)
{
$indexed_children = [];
$children = $node->childNodes;
foreach ($children as $child) {
$index = $child->getAttribute('name');
$indexed_children[$index] = $child;
}
return $indexed_children;
}
/**
* Reads the XML nodes of one record and creates a LibraryDocument
* out of it.
*
* @param DOMElement $node The XML node of one record.
*
* @returns LibraryDocument The LibraryDocument instance that could be read
* from the data.
*/
protected function readXMLRecord(\DOMElement $node) : LibraryDocument
{
$result = new LibraryDocument();
$children = $this->indexChildren($node);
foreach ($children as $name => $child) {
if ($child instanceof \DOMElement) {
if ($name == 'dctypenorm') {
//Set the document type by the value of this field.
$base_typeid = trim($child->textContent);
if ($base_typeid == '11' || $base_typeid == '111') {
$result->type = 'book';
} elseif ($base_typeid == '12' || $base_typeid == '121' || $base_typeid == '122') {
$result->type = 'article';
} elseif ($base_typeid == '13') {
$result->type = 'paper-conference';
} elseif ($base_typeid == '14') {
$result->type = 'report';
} else {
$result->type = $base_typeid;
}
} elseif ($name == 'dctitle') {
$result->csl_data['title'] = $child->textContent;
} elseif ($name == 'dccreator') {
$authors = $child->getElementsByTagName('str');
$csl_authors = [];
foreach ($authors as $author) {
$author_names = explode(', ', $author->textContent);
$csl_authors[] = [
'family' => $author_names[0],
'given' => $author_names[1],
'suffix' => ''
];
}
$result->csl_data['author'] = $csl_authors;
} elseif ($name == 'dcdate') {
$date_and_time = explode('T', $child->textContent);
$date_parts = explode('-', $date_and_time[0]);
$result->csl_data['issued'] = ['date-parts' => [$date_parts]];
} elseif (($name == 'dcyear') && !($result->csl_data['issued'])) {
$result->csl_data['issued'] = ['date-parts' => [$child->textContent]];
} elseif ($name == 'dcdescription') {
$result->csl_data['abstract'] = $child->textContent;
} elseif ($name == 'dcpublisher') {
$str = $child->childNodes[0];
if ($str instanceof \DOMElement) {
$result->csl_data['publisher'] = $str->textContent;
}
} elseif ($name == 'dclink') {
$result->csl_data['URL'] = $child->textContent;
} elseif ($name == 'dcdocid') {
$result->csl_data['DOI'] = $child->textContent;
} else {
//All other field values are stored in the datafields array.
$result->datafields[$name] = $child->textContent;
}
}
}
return $result;
}
/**
* @see LibraryResultParser::readResultSet
*/
public function readResultSet($data = '') : array
{
if (!$data) {
return [];
}
$dom = new \DOMDocument();
@$dom->loadXML($data);
$result = $dom->getElementsByTagName('response')[0];
if (!$result) {
//Wrong document type.
return [];
}
$documents = $result->getElementsByTagName('doc');
$result_set = [];
foreach ($documents as $document) {
$result_set[] = $this->readXMLRecord($document);
}
return $result_set;
}
/**
* @see LibraryResultParser::readRecord
*/
public function readRecord($data = ''): LibraryDocument
{
$dom = new DOMDocument();
@$dom->loadXML($data);
$record = $dom->getElementsByTagName('doc')[0];
if ($record) {
return $this->readXMLRecord($record);
}
throw new Exception('Could not read record');
}
}
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