add JSON export renderer

Application/Model/ExportRenderer/Json.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ * 
+ * https://www.d3data.de
+ *
+ * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
+ * @author    D3 Data Development - Daniel Seifert <info@shopmodule.com>
+ * @link      https://www.oxidmodule.com
+ */
+
+declare(strict_types=1);
+
+namespace D3\DataWizard\Application\Model\ExportRenderer;
+
+use D3\DataWizard\Application\Model\Exceptions\RenderException;
+
+class Json implements RendererInterface
+{
+    /**
+     * @param $rows
+     * @param $fieldNames
+     *
+     * @return string
+     * @throws RenderException
+     */
+    public function getContent($rows, $fieldNames): string
+    {
+        $flags = JSON_PRETTY_PRINT;
+        $json  = json_encode( $rows, $flags );
+        if ( $json === false ) {
+            throw oxNew( RenderException::class, json_last_error_msg(), json_last_error());
+        }
+        return $json;
+    }
+
+    public function getFileExtension(): string
+    {
+        return 'json';
+    }
+
+    /**
+     * @return string
+     */
+    public function getTitleTranslationId(): string
+    {
+        return "D3_DATAWIZARD_EXPORT_FORMAT_JSON";
+    }
+}