[Notifier] [DX] UnsupportedMessageTypeException for notifier transports

Author: OskarStark

Exception/UnsupportedMessageTypeException.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Notifier\Exception;
+
+use Symfony\Component\Notifier\Message\MessageInterface;
+
+/**
+ * @author Oskar Stark <oskarstark@googlemail.com>
+ *
+ * @experimental in 5.3
+ */
+class UnsupportedMessageTypeException extends LogicException
+{
+    public function __construct(string $transport, string $supported, MessageInterface $given)
+    {
+        $message = sprintf(
+            'The "%s" transport only supports instances of "%s" (instance of "%s" given).',
+            $transport,
+            $supported,
+            get_debug_type($given)
+        );
+
+        parent::__construct($message);
+    }
+}

Transport/TransportInterface.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Notifier\Transport;
 
 use Symfony\Component\Notifier\Exception\TransportExceptionInterface;
+use Symfony\Component\Notifier\Exception\UnsupportedMessageTypeException;
 use Symfony\Component\Notifier\Message\MessageInterface;
 use Symfony\Component\Notifier\Message\SentMessage;