refactored search with free search term support (#1064)

src/Form/DataTransformer/SearchTermTransformer.php

@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Form\DataTransformer;
+
+use App\Utils\SearchTerm;
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+
+class SearchTermTransformer implements DataTransformerInterface
+{
+    /**
+     * Transforms a SearchTerm object to a string.
+     *
+     * @param SearchTerm|null $searchTerm
+     * @return string
+     */
+    public function transform($searchTerm)
+    {
+        if (empty($searchTerm) || !$searchTerm instanceof SearchTerm) {
+            return '';
+        }
+
+        return $searchTerm->getOriginalSearch();
+    }
+
+    /**
+     * Transforms a string to a SearchTerm object.
+     *
+     * @param string $searchTerm
+     * @return SearchTerm|null
+     * @throws TransformationFailedException if object (issue) is not found
+     */
+    public function reverseTransform($searchTerm)
+    {
+        if (empty($searchTerm)) {
+            return null;
+        }
+
+        return new SearchTerm($searchTerm);
+    }
+}