[ticket/13487] Add factory for db tool class

This allows us to split up the large file one by one easily.

PHPBB3-13487

phpBB/phpbb/db/tools/factory.php

@@ -0,0 +1,35 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\db\tools;
+
+/**
+ * A factory which serves the suitable tools instance for the given dbal
+ */
+class factory
+{
+	/**
+	 * @param mixed $db_driver
+	 * @param bool $return_statements
+	 * @return \phpbb\db\tools\tools_interface
+	 */
+	public function get($db_driver, $return_statements = false)
+	{
+		if ($db_driver instanceof \phpbb\db\driver\driver_interface)
+		{
+			return new \phpbb\db\tools\tools($db_driver, $return_statements);
+		}
+
+		throw new \InvalidArgumentException('Invalid database driver given');
+	}
+}