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Classes/Domain/Search/ResultSet/Facets/SortingExpression.php

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+<?php
+namespace WapplerSystems\Meilisearch\Domain\Search\ResultSet\Facets;
+
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) 2017- Timo Hund <timo.hund@dkd.de>
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *
+ *  This script 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.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+/**
+ * Expression for facet sorting
+ *
+ * @author Timo Hund <timo.hund@dkd.de>
+ * @author Jens Jacobsen <jens.jacobsen@ueberbit.de>
+ */
+class SortingExpression
+{
+    /**
+     * Return expression for facet sorting
+     *
+     * @param string $sorting
+     * @return string
+     */
+    public function getForFacet($sorting)
+    {
+        $noSortingSet = $sorting !== 0 && $sorting !== FALSE && empty($sorting);
+        $sortingIsCount = $sorting === 'count' || $sorting === 1 || $sorting === '1' || $sorting === TRUE;
+        if ($noSortingSet) {
+            return '';
+        } elseif ($sortingIsCount) {
+            return 'count';
+        } else {
+            return 'index';
+        }
+    }
+
+    /**
+     * Return expression for facet sorting combined with direction
+     *
+     * @param string $sorting
+     * @param string $direction
+     * @return string
+     */
+    public function getForJsonFacet($sorting, $direction)
+    {
+        $isMetricSorting = strpos($sorting, 'metrics_') === 0;
+        $expression = $isMetricSorting ? $sorting : $this->getForFacet($sorting);
+        $direction = strtolower($direction);
+        if (!empty($direction) && in_array($direction, ['asc', 'desc'])) {
+            $expression .= ' ' . $direction;
+        }
+        return $expression;
+    }
+}