performance tuning on timesheets (#874)

src/Repository/Paginator/TimesheetPaginator.php

@@ -0,0 +1,73 @@
+<?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\Repository\Paginator;
+
+use App\Repository\Loader\TimesheetLoader;
+use Doctrine\ORM\Query;
+use Doctrine\ORM\QueryBuilder;
+use Pagerfanta\Adapter\AdapterInterface;
+
+final class TimesheetPaginator implements AdapterInterface
+{
+    /**
+     * @var QueryBuilder
+     */
+    private $query;
+    /**
+     * @var int
+     */
+    private $results = 0;
+    /**
+     * @var TimesheetLoader
+     */
+    private $loader;
+
+    public function __construct(QueryBuilder $query, int $results)
+    {
+        $this->query = $query;
+        $this->results = $results;
+        $this->loader = new TimesheetLoader($query->getEntityManager());
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getNbResults()
+    {
+        return $this->results;
+    }
+
+    private function getResults(Query $query)
+    {
+        $results = $query->execute();
+
+        $this->loader->loadResults($results);
+
+        return $results;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSlice($offset, $length)
+    {
+        $query = $this->query
+            ->getQuery()
+            ->setFirstResult($offset)
+            ->setMaxResults($length);
+
+        return $this->getResults($query);
+    }
+
+    public function getAll()
+    {
+        return $this->getResults($this->query->getQuery());
+    }
+}