Move dynamic segments from Premium plugin

[MAILPOET-2382]

lib/Models/SubscribersInDynamicSegment.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace MailPoet\Premium\Models;
+
+use MailPoet\Models\Subscriber;
+use MailPoet\Premium\DynamicSegments\Mappers\DBMapper;
+use MailPoet\Premium\DynamicSegments\Persistence\Loading\SingleSegmentLoader;
+
+class SubscribersInDynamicSegment extends Subscriber {
+
+  static function listingQuery(array $data = []) {
+    $query = self::select(self::$_table . '.*');
+    $single_segment_loader = new SingleSegmentLoader(new DBMapper());
+    $dynamic_segment = $single_segment_loader->load($data['filter']['segment']);
+    foreach ($dynamic_segment->getFilters() as $filter) {
+      $query = $filter->toSql($query);
+    }
+    if (isset($data['group'])) {
+      $query->filter('groupBy', $data['group']);
+    }
+    if (isset($data['search']) && $data['search']) {
+      $query->filter('search', $data['search']);
+    }
+    return $query;
+  }
+
+}