Updated to KH 3.3 and improved

includes/kohana/system/classes/Kohana/Config/Writer.php

@@ -0,0 +1,27 @@
+<?php defined('SYSPATH') OR die('No direct script access.');
+
+/**
+ * Interface for config writers
+ *
+ * Specifies the methods that a config writer must implement 
+ * 
+ * @package Kohana
+ * @author  Kohana Team
+ * @copyright  (c) 2008-2012 Kohana Team
+ * @license    http://kohanaphp.com/license
+ */
+interface Kohana_Config_Writer extends Kohana_Config_Source
+{
+	/**
+	 * Writes the passed config for $group
+	 *
+	 * Returns chainable instance on success or throws 
+	 * Kohana_Config_Exception on failure
+	 *
+	 * @param string      $group  The config group
+	 * @param string      $key    The config key to write to
+	 * @param array       $config The configuration to write
+	 * @return boolean
+	 */
+	public function write($group, $key, $config);
+}