private static boolean isProviderClass(Class<?> c)
    {
        return (c != null) && c.isAnnotationPresent(javax.ws.rs.ext.Provider.class);
    }
private static boolean isProviderClass ( Class < ? > c ) { return ( c != null ) && c . isAnnotationPresent ( javax . ws . rs . ext . Provider . class ) ; }
copied from Jersey 1.17.1