private static String getInnerMapKey(final String key) {
        final int index = key.indexOf(".");
        return key.substring(index + 1);
    }
private static String getInnerMapKey ( final String key ) { final int index = key . indexOf ( "." ) ; return key . substring ( index + 1 ) ; }
create inner key map by taking what ever is after the first dot.

@param key
@return