Index: branches/5.3.x/core/kernel/utility/unit_config_reader.php
===================================================================
diff -u -N -r16178 -r16181
--- branches/5.3.x/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 16178)
+++ branches/5.3.x/core/kernel/utility/unit_config_reader.php	(.../unit_config_reader.php)	(revision 16181)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: unit_config_reader.php 16178 2015-05-13 19:36:51Z alex $
+* @version	$Id: unit_config_reader.php 16181 2015-05-15 16:54:20Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -641,13 +641,19 @@
 	}
 
 	/**
-	 * Returns prefixes of unit configs, that were registered
+	 * Returns prefixes of unit configs, that were registered.
 	 *
-	 * @return Array
+	 * @param boolean $loaded_only Only return prefixes, that were loaded till now.
+	 *
+	 * @return array
 	 */
-	public function getPrefixes()
+	public function getPrefixes($loaded_only = true)
 	{
-		return array_keys($this->configData);
+		if ( $loaded_only ) {
+			return array_keys($this->configData);
+		}
+
+		return array_keys($this->prefixFiles);
 	}
 
 	/**
@@ -721,12 +727,14 @@
 	 * @param string $prefix Unit config prefix.
 	 *
 	 * @return string
-	 * @throws Exception When unit config is not found.
+	 * @throws InvalidArgumentException When unit config is not found.
 	 */
 	public function getPrefixFile($prefix)
 	{
 		if ( !isset($this->prefixFiles[$prefix]) ) {
-			throw new Exception('Configuration file for prefix "<strong>' . $prefix . '</strong>" is unknown');
+			throw new InvalidArgumentException(
+				'Configuration file for prefix "<strong>' . $prefix . '</strong>" is unknown'
+			);
 		}
 
 		return $this->prefixFiles[$prefix];