Created methods to get orphan visits lists

module/Core/src/Spec/InDateRange.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Core\Spec;
+
+use Happyr\DoctrineSpecification\BaseSpecification;
+use Happyr\DoctrineSpecification\Spec;
+use Happyr\DoctrineSpecification\Specification\Specification;
+use Shlinkio\Shlink\Common\Util\DateRange;
+
+class InDateRange extends BaseSpecification
+{
+    private ?DateRange $dateRange;
+    private string $field;
+
+    public function __construct(?DateRange $dateRange, string $field = 'date')
+    {
+        parent::__construct();
+        $this->dateRange = $dateRange;
+        $this->field = $field;
+    }
+
+    protected function getSpec(): Specification
+    {
+        $criteria = [];
+
+        if ($this->dateRange !== null && $this->dateRange->getStartDate() !== null) {
+            $criteria[] = Spec::gte($this->field, $this->dateRange->getStartDate()->toDateTimeString());
+        }
+
+        if ($this->dateRange !== null && $this->dateRange->getEndDate() !== null) {
+            $criteria[] = Spec::lte($this->field, $this->dateRange->getEndDate()->toDateTimeString());
+        }
+
+        return Spec::andX(...$criteria);
+    }
+}