aggregators added - monthYearAggregator not finished

src/Bundle/ChillCalendarBundle/Export/Aggregator/MonthYearAggregator.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Chill\CalendarBundle\Export\Aggregator;
+
+use Chill\CalendarBundle\Export\Declarations;
+use Chill\MainBundle\Export\AggregatorInterface;
+use Closure;
+use Doctrine\ORM\QueryBuilder;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Security\Core\Role\Role;
+
+class MonthYearAggregator implements AggregatorInterface
+{
+
+    public function getQueryKeys($data): array
+    {
+        return ['monty_year_aggregator'];
+    }
+
+    public function getLabels($key, array $values, $data): Closure
+    {
+
+    }
+
+    public function buildForm(FormBuilderInterface $builder)
+    {
+        // No form needed
+    }
+
+    public function getTitle(): string
+    {
+        return 'Group by month and year';
+    }
+
+    public function addRole(): ?Role
+    {
+        return null;
+    }
+
+    public function alterQuery(QueryBuilder $qb, $data)
+    {
+        // TODO: Implement alterQuery() method.
+    }
+
+    public function applyOn(): string
+    {
+        return [ Declarations::CALENDAR_TYPE ];
+    }
+}