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Classes/FieldProcessor/AbstractHierarchyProcessor.php

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+<?php
+namespace WapplerSystems\Meilisearch\FieldProcessor;
+
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) 2014-2015 Ingo Renner <ingo@typo3.org>
+ *  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!
+ ***************************************************************/
+
+/**
+ * Provides common methods for field processors creating a hierarchy.
+ *
+ * @author Ingo Renner <ingo@typo3.org>
+ */
+abstract class AbstractHierarchyProcessor
+{
+
+    /**
+     * Builds a Solr hierarchy from an array of uids that make up a rootline.
+     *
+     * @param array $idRootline Array of Ids representing a rootline
+     * @return array Solr hierarchy
+     * @see http://wiki.apache.org/solr/HierarchicalFaceting
+     */
+    protected function buildSolrHierarchyFromIdRootline(array $idRootline)
+    {
+        $hierarchy = [];
+
+        $depth = 0;
+        $currentPath = array_shift($idRootline);
+        if (is_null($currentPath)) {
+            return $hierarchy;
+        }
+
+        foreach ($idRootline as $uid) {
+            $hierarchy[] = $depth . '-' . $currentPath . '/';
+
+            $depth++;
+            $currentPath .= '/' . $uid;
+        }
+        $hierarchy[] = $depth . '-' . $currentPath . '/';
+
+        return $hierarchy;
+    }
+}