diff --git a/core/oqlclassnode.class.inc.php b/core/oqlclassnode.class.inc.php
index cc21fb7290..da157f588e 100644
--- a/core/oqlclassnode.class.inc.php
+++ b/core/oqlclassnode.class.inc.php
@@ -128,6 +128,19 @@ class OQLClassNode
 		return $sOQL;
 	}
 
+	public function Browse(Closure $callback)
+	{
+		$callback($this);
+		foreach ($this->GetJoins() as $aJoins)
+		{
+			/** @var \OQLJoin $oJoin */
+			foreach ($aJoins as $oJoin)
+			{
+				$oJoin->GetOOQLClassNode()->Browse($callback);
+			}
+		}
+	}
+
 	public function GetExternalKeys()
 	{
 		return $this->aExtKeys;
@@ -318,4 +331,4 @@ class OQLJoin
 		return $this->sRightField;
 	}
 
-}
\ No newline at end of file
+}
diff --git a/core/oqlclasstreebuilder.class.inc.php b/core/oqlclasstreebuilder.class.inc.php
index bd477930dd..a397ab3dbc 100644
--- a/core/oqlclasstreebuilder.class.inc.php
+++ b/core/oqlclasstreebuilder.class.inc.php
@@ -23,7 +23,7 @@ class OQLClassTreeBuilder
 	 * @param \DBObjectSearch $oDBObjetSearch
 	 * @param \QueryBuilderContext $oBuild
 	 */
-	public function __construct($oDBObjetSearch, $oBuild)
+	protected function __construct($oDBObjetSearch, $oBuild)
 	{
 		$this->oBuild = $oBuild;
 		$this->oDBObjectSearch = $oDBObjetSearch;
@@ -36,6 +36,25 @@ class OQLClassTreeBuilder
 		$this->oOQLClassNode = new OQLClassNode($oBuild, $this->sClass, $this->sClassAlias);
 	}
 
+	/**
+	 * @param \DBObjectSearch $oDBObjetSearch
+	 * @param \QueryBuilderContext $oBuild
+	 *
+	 * @return \OQLClassNode
+	 * @throws \CoreException
+	 */
+	public static function GetOQLClassTree($oDBObjetSearch, $oBuild)
+	{
+		$oOQLClassTreeBuilder = new OQLClassTreeBuilder($oDBObjetSearch, $oBuild);
+		$oOQLClassNode = $oOQLClassTreeBuilder->DevelopOQLClassNode();
+		$oOQLClassTreeOptimizer = new OQLClassTreeOptimizer($oOQLClassNode, $oBuild);
+		$oOQLClassTreeOptimizer->OptimizeClassTree();
+		$oOQLActualClassTreeResolver = new OQLActualClassTreeResolver($oOQLClassNode, $oBuild);
+		$oOQLClassNode = $oOQLActualClassTreeResolver->Resolve();
+
+		return $oOQLClassNode;
+	}
+
 	/**
 	 * Develop OQL.
 	 * Add joins from OQL (outgoing and incoming)