Add Doctrine EntityManager configuration

[MAILPOET-2014]

lib/Doctrine/ConfigurationFactory.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace MailPoet\Doctrine;
+
+use MailPoetVendor\Doctrine\ORM\Configuration;
+use MailPoetVendor\Doctrine\ORM\Mapping\UnderscoreNamingStrategy;
+
+class ConfigurationFactory {
+  const ENTITY_DIR = __DIR__ . '/../Doctrine/Entities';
+
+  /** @var bool */
+  private $is_dev_mode;
+
+  function __construct() {
+    $this->is_dev_mode = WP_DEBUG;
+  }
+
+  function createConfiguration() {
+    $configuration = new Configuration();
+    $configuration->setNamingStrategy(new UnderscoreNamingStrategy());
+    $configuration->setMetadataDriverImpl($configuration->newDefaultAnnotationDriver([self::ENTITY_DIR]));
+
+    if (!$this->is_dev_mode) {
+      $configuration->ensureProductionSettings();
+    }
+    return $configuration;
+  }
+}