Index: branches/5.2.x/core/units/helpers/mod_rewrite_helper.php
===================================================================
diff -u -N -r15293 -r15862
--- branches/5.2.x/core/units/helpers/mod_rewrite_helper.php	(.../mod_rewrite_helper.php)	(revision 15293)
+++ branches/5.2.x/core/units/helpers/mod_rewrite_helper.php	(.../mod_rewrite_helper.php)	(revision 15862)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: mod_rewrite_helper.php 15293 2012-04-12 09:02:04Z alex $
+* @version	$Id: mod_rewrite_helper.php 15862 2013-07-04 09:48:57Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -29,24 +29,18 @@
 		 */
 		public function RewriteListener($rewrite_mode = REWRITE_MODE_BUILD, $prefix, &$params, &$url_parts, $keep_events = false)
 		{
-			static $parsed = false;
-
 			if ($rewrite_mode == REWRITE_MODE_BUILD) {
 				return $this->_buildCategoryItemUrl($prefix, $params, $keep_events);
 			}
 
-			if (!$parsed) {
+			$module_prefix = $this->_parseCategoryItemUrl($url_parts, $params, $prefix);
+
+			if ($module_prefix !== false) {
 				$rewrite_processor = $this->Application->recallObject('kRewriteUrlProcessor');
 				/* @var $rewrite_processor kRewriteUrlProcessor */
 
-				$module_prefix = $this->_parseCategoryItemUrl($url_parts, $params);
-
-				if ($module_prefix !== false) {
-					$params['pass'][] = $module_prefix;
-					$rewrite_processor->modulePrefix = $module_prefix;
-				}
-
-				$parsed = true;
+				$params['pass'][] = $module_prefix;
+				$rewrite_processor->setModulePrefix($module_prefix);
 			}
 
 			return true;
@@ -236,10 +230,12 @@
 		 *
 		 * @param Array $url_parts
 		 * @param Array $vars
-		 * @return bool|string
+		 * @param string $prefix Prefix, that listener uses for system integration
+		 *
+		 * @return boolean|string
 		 * @access protected
 		 */
-		protected function _parseCategoryItemUrl(&$url_parts, &$vars)
+		protected function _parseCategoryItemUrl(&$url_parts, &$vars, $prefix)
 		{
 			if ( !$url_parts ) {
 				return false;
@@ -254,20 +250,15 @@
 			$rewrite_processor = $this->Application->recallObject('kRewriteUrlProcessor');
 			/* @var $rewrite_processor kRewriteUrlProcessor */
 
-			if ( preg_match('/^bb_([\d]+)/', $item_filename, $regs) ) {
+			if ( $prefix == 'bb' && preg_match('/^bb_([\d]+)/', $item_filename, $regs) ) {
 				// process topics separately, because they don't use item filenames
 				array_pop($url_parts);
 				$rewrite_processor->partParsed($item_filename, 'rtl');
 
 				return $this->_parseTopicUrl($regs[1], $vars);
 			}
 
-			// locating the item in CategoryItems by filename to detect its ItemPrefix and its category ParentPath
-			$sql = 'SELECT ci.ItemResourceId, ci.ItemPrefix, c.ParentPath, ci.CategoryId
-					FROM ' . TABLE_PREFIX . 'CategoryItems AS ci
-					LEFT JOIN ' . TABLE_PREFIX . 'Categories AS c ON c.CategoryId = ci.CategoryId
-					WHERE (ci.CategoryId = ' . (int)$vars['m_cat_id'] . ') AND (ci.Filename = ' . $this->Conn->qstr($item_filename) . ')';
-			$cat_item = $this->Conn->GetRow($sql);
+			$cat_item = $this->findCategoryItem((int)$vars['m_cat_id'], $item_filename, $prefix);
 
 			if ( $cat_item !== false ) {
 				// item found
@@ -302,6 +293,34 @@
 		}
 
 		/**
+		 * Locating the item in CategoryItems by filename to detect its ItemPrefix and its category ParentPath.
+		 *
+		 * @param integer $category_id Category.
+		 * @param string  $filename    Filename.
+		 * @param string  $prefix      Prefix, that listener uses for system integration
+		 *
+		 * @return string
+		 */
+		protected function findCategoryItem($category_id, $filename, $prefix)
+		{
+			static $cache = array();
+
+			$cache_key = $category_id . ':' . $filename;
+
+			if ( !isset($cache[$cache_key]) ) {
+				$sql = 'SELECT ci.ItemResourceId, ci.ItemPrefix, c.ParentPath, ci.CategoryId
+						FROM ' . TABLE_PREFIX . 'CategoryItems AS ci
+						LEFT JOIN ' . TABLE_PREFIX . 'Categories AS c ON c.CategoryId = ci.CategoryId
+						WHERE (ci.CategoryId = ' . $category_id . ') AND (ci.Filename = ' . $this->Conn->qstr($filename) . ')';
+				$cache[$cache_key] = $this->Conn->GetRow($sql);
+			}
+
+			$category_item = $cache[$cache_key];
+
+			return $category_item && $category_item['ItemPrefix'] == $prefix ? $category_item : false;
+		}
+
+		/**
 		 * Set's template and topic id corresponding to topic given in url
 		 *
 		 * @param int $topic_id