Move plugin files to a subfolder

[MAILPOET-3988]

mailpoet/lib/Doctrine/Annotations/AnnotationReaderProvider.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace MailPoet\Doctrine\Annotations;
+
+use MailPoet\Doctrine\PSRArrayCache;
+use MailPoetVendor\Doctrine\Common\Annotations\AnnotationReader;
+use MailPoetVendor\Doctrine\Common\Annotations\AnnotationRegistry;
+use MailPoetVendor\Doctrine\Common\Annotations\PsrCachedReader;
+
+class AnnotationReaderProvider {
+  /** @var PsrCachedReader */
+  private $annotationReader;
+
+  public function __construct() {
+    // register annotation reader if doctrine/annotations package is installed
+    // (i.e. in dev environment, on production metadata is dumped in the build)
+    $readAnnotations = class_exists(PsrCachedReader::class) && class_exists(AnnotationReader::class);
+    if ($readAnnotations) {
+      // autoload all annotation classes using registered loaders (Composer)
+      // (needed for Symfony\Validator constraint annotations to be loaded)
+      AnnotationRegistry::registerLoader('class_exists');
+      $this->annotationReader = new PsrCachedReader(new AnnotationReader(), new PSRArrayCache());
+    }
+  }
+
+  public function getAnnotationReader(): ?PsrCachedReader {
+    return $this->annotationReader;
+  }
+}