/**
 * An empty contiguous set.
 *
 * @author Gregory Kick
 */
@GwtCompatible
@SuppressWarnings("rawtypes") // allow ungenerified Comparable types
final class EmptyContiguousSet<C extends Comparable> extends ContiguousSet<C> {
  EmptyContiguousSet(DiscreteDomain<C> domain) {
    super(domain);
  }

  @Override
  public C first() {
    throw new NoSuchElementException();
  }

  @Override
  public C last() {

  }

  private ContiguousSet<C> intersectionInCurrentDomain(Range<C> other) {
    return range.isConnected(other)
        ? ContiguousSet.create(range.intersection(other), domain)
        : new EmptyContiguousSet<C>(domain);
  }

  @Override
  ContiguousSet<C> headSetImpl(C toElement, boolean inclusive) {
    return intersectionInCurrentDomain(Range.upTo(toElement, BoundType.forBoolean(inclusive)));
  }

  @Override

      // Per class spec, we are allowed to throw CCE if necessary
      empty = Range.compareOrThrow(afterLower, beforeUpper) > 0;
    }

    return empty
        ? new EmptyContiguousSet<C>(domain)
        : new RegularContiguousSet<C>(effectiveRange, domain);
  }

  /**
   * Returns a nonempty contiguous set containing all {@code int} values from {@code lower}

  }

  @GwtIncompatible // SerializableTester
  public void testSerialization() {
    ContiguousSet<Integer> empty = ContiguousSet.create(Range.closedOpen(1, 1), integers());
    assertTrue(empty instanceof EmptyContiguousSet);
    reserializeAndAssert(empty);

    ContiguousSet<Integer> regular = ContiguousSet.create(Range.closed(1, 3), integers());
    assertTrue(regular instanceof RegularContiguousSet);

      // Per class spec, we are allowed to throw CCE if necessary
      empty = Range.compareOrThrow(afterLower, beforeUpper) > 0;
    }

    return empty
        ? new EmptyContiguousSet<C>(domain)
        : new RegularContiguousSet<C>(effectiveRange, domain);
  }

  /**
   * Returns a nonempty contiguous set containing all {@code int} values from {@code lower}

  }

  @GwtIncompatible // SerializableTester
  public void testSerialization() {
    ContiguousSet<Integer> empty = ContiguousSet.create(Range.closedOpen(1, 1), integers());
    assertTrue(empty instanceof EmptyContiguousSet);
    reserializeAndAssert(empty);

    ContiguousSet<Integer> regular = ContiguousSet.create(Range.closed(1, 3), integers());
    assertTrue(regular instanceof RegularContiguousSet);