Implement default querybuilder.

src/HAB/Solr/Command/QueryBuilder.php

+<?php
+
+/**
+ * This file is part of HAB Solr.
+ *
+ * HAB Solr 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.
+ *
+ * HAB Solr 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HAB Solr.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2016 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+
+namespace HAB\Solr\Command;
+
+use HAB\Solr\ParamBag;
+
+/**
+ * Query builder default implementation.
+ *
+ * @author    David Maus <maus@hab.de>
+ * @copyright (c) 2017 by Herzog August Bibliothek Wolfenbüttel
+ * @license   http://www.gnu.org/licenses/gpl.txt GNU General Public License v3 or higher
+ */
+class QueryBuilder implements QueryBuilderInterface
+{
+    /**
+     * Return Solr query parameters.
+     *
+     * @param  array|\ArrayAccess $query
+     * @return ParamBag
+     */
+    public function buildQuery ($query)
+    {
+        return new ParamBag($query);
+    }
+}
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