private function _prepareJoin(array $joinArray)
	{
		if(count($joinArray) > 0)
		{
			$factory = $this->expressionBuilderFactory->create($joinArray[0]);
			foreach($joinArray as $number => $join)
			{
				if($number === 0)
				{
					$this->join = $factory->build();
				}
				else
				{
					$this->join .= $factory->rebuild($join);
				}
			}
		}
	}