added annotation based exporter (#1831)

* added user exporter
* added project exporter
* added customer exporter
* added activity exporter

src/Export/Spreadsheet/Extractor/MetaFieldExtractor.php

@@ -0,0 +1,68 @@
+<?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\Export\Spreadsheet\Extractor;
+
+use App\Entity\EntityWithMetaFields;
+use App\Event\MetaDisplayEventInterface;
+use App\Export\Spreadsheet\ColumnDefinition;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
+
+/**
+ * @internal
+ */
+final class MetaFieldExtractor implements ExtractorInterface
+{
+    /**
+     * @var EventDispatcherInterface
+     */
+    private $eventDispatcher;
+
+    public function __construct(EventDispatcherInterface $eventDispatcher)
+    {
+        $this->eventDispatcher = $eventDispatcher;
+    }
+
+    /**
+     * @param MetaDisplayEventInterface $value
+     * @return ColumnDefinition[]
+     * @throws ExtractorException
+     */
+    public function extract($value): array
+    {
+        if (!($value instanceof MetaDisplayEventInterface)) {
+            throw new ExtractorException('MetaFieldExtractor needs a MetaDisplayEventInterface instance for work');
+        }
+
+        $columns = [];
+
+        $this->eventDispatcher->dispatch($value);
+
+        foreach ($value->getFields() as $field) {
+            if (!$field->isVisible()) {
+                continue;
+            }
+
+            $columns[] = new ColumnDefinition(
+                $field->getLabel(),
+                'string',
+                function (EntityWithMetaFields $entityWithMetaFields) use ($field) {
+                    $meta = $entityWithMetaFields->getMetaField($field->getName());
+                    if (null === $meta) {
+                        return null;
+                    }
+
+                    return $meta->getValue();
+                }
+            );
+        }
+
+        return $columns;
+    }
+}