public static synchronized ClassLister getSingleton ( ClassTraversal traversal ) { Class < ? extends ClassTraversal > cls ; cls = ( traversal == null ) ? null : traversal . getClass ( ) ; if ( m_Singleton == null ) m_Singleton = new HashMap <> ( ) ; if ( ! m_Singleton . containsKey ( cls ) ) m_Singleton . put ( cls , new ClassLister ( traversal ) ) ; return m_Singleton . get ( cls ) ; }
Returns the singleton instance of the class lister .