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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 LibrarySearch implementation for catalogs that use SRU.
*
* @see LibrarySearch
*/
class SRULibrarySearch extends LibrarySearch
{
/**
* This array is used to map the general search field names to
* the real field names.
*/
protected static $field_replacements = [
'pica' => [
LibrarySearch::TITLE => 'pica.tit',
LibrarySearch::AUTHOR => 'pica.per',
LibrarySearch::YEAR => 'pica.jhr',
LibrarySearch::NUMBER => 'pica.num',
LibrarySearch::ISBN => 'pica.isb',
LibrarySearch::ISSN => 'pica.iss',
LibrarySearch::PUBLICATION => 'pica.gti',
LibrarySearch::SIGNATURE => 'pica.sga'
],
'cql' => [
LibrarySearch::TITLE => 'dc.title',
LibrarySearch::AUTHOR => 'dc.creator',
LibrarySearch::YEAR => 'dc.date',
LibrarySearch::NUMBER => 'dc.identifier',
LibrarySearch::ISBN => 'dc.identifier',
LibrarySearch::ISSN => 'dc.identifier'
]
];
/**
* @see LibrarySearch::translateQueryFields
*/
protected function translateQueryFields(array $query_fields = []) : array
{
if (!$query_fields) {
return [];
}
$query_format = 'pica';
if ($this->settings['query_format'] == 'cql') {
$query_format = 'cql';
}
$translated_fields = [];
foreach ($query_fields as $key => $value) {
if (in_array($key, array_keys(self::$field_replacements[$query_format]))) {
$new_key = self::$field_replacements[$query_format][$key];
$translated_fields[$new_key] = $value;
} else {
$translated_fields[$key] = $value;
}
}
return $translated_fields;
}
/**
* @see LibrarySearch::query
*/
public function query(
array $search_parameters = [],
string $order_by = self::ORDER_BY_RELEVANCE,
int $limit = 200
) : array
{
if (!$search_parameters) {
return [];
}
//The standardised parameter names must be converted to module-specific
//search parameter names before being added to the query string.
$search_parameters = $this->translateQueryFields($search_parameters);
$query_string = '';
$query_format = 'pica';
if ($this->settings['query_format'] == 'cql') {
$query_format = 'cql';
}
foreach ($search_parameters as $key => $value) {
if (!empty($query_string)) {
$query_string .= ' and ';
}
if ($key == self::$field_replacements[$query_format][LibrarySearch::NUMBER]) {
$query_string .= sprintf(
'(%1$s="%2$s" or %3$s="%2$s" or %4$s="%2$s")',
self::$field_replacements[$query_format][LibrarySearch::ISBN],
addslashes($value),
self::$field_replacements[$query_format][LibrarySearch::ISSN],
self::$field_replacements[$query_format][LibrarySearch::NUMBER]
);
} else {
//TODO: escape colon in data!
$query_string .= sprintf('%1$s="%2$s"', $key, addslashes($value));
}
}
$query_parameters = [];
$query_parameters['version'] = '1.1'; //TODO: is version 2.0 supported?
$query_parameters['operation'] = 'searchRetrieve';
$query_parameters['recordSchema'] = 'marcxml';
if ($this->settings['sru_version'] == '1.2') {
$query_parameters['version'] = '1.2';
//Use SRU/SRW 1.2
if ($order_by == self::ORDER_BY_RELEVANCE) {
if ($query_format != 'cql') {
$query_string .= ' sortby relevance/descending';
}
} elseif ($order_by == self::ORDER_BY_YEAR) {
if ($query_format == 'cql') {
$query_string .= ' sortBy dc.date/sort.descending';
} else {
$query_string .= ' sortby year/descending';
}
}
} else {
//Use SRU/SRW 1.1
if ($order_by == self::ORDER_BY_RELEVANCE) {
$query_parameters['sortKeys'] = 'relevance,,0';
} elseif ($order_by == self::ORDER_BY_YEAR) {
$query_parameters['sortKeys'] = 'year,,0';
}
}
$query_parameters['maximumRecords'] = $limit;
$query_parameters['query'] = $query_string;
$data = $this->requestData($this->request_base_url, $query_parameters);
if (!$data) {
//There are no data we can retrieve.
return [];
}
$parser = new SRULibraryResultParser();
return $parser->readResultSet($data);
}
}
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