class CaselessUnmodifiableMultivaluedMap extends CaselessMultivaluedMap<T> {

    @Override
    public void putSingle(String key, T value) {
        throw new UnsupportedOperationException("putSingle");
    }

    public  CaselessUnmodifiableMultivaluedMap();
    public  CaselessUnmodifiableMultivaluedMap(int capacity);
    public  CaselessUnmodifiableMultivaluedMap(Map<String, List<T>> m);

}