Method span

guava/src/com/google/common/collect/TreeRangeSet.java:164–176

()

  }

  @Override
  public Range<C> span() {
    Entry<Cut<C>, Range<C>> firstEntry = rangesByLowerBound.firstEntry();
    Entry<Cut<C>, Range<C>> lastEntry = rangesByLowerBound.lastEntry();
    if (firstEntry == null || lastEntry == null) {
      /*
       * Either both are null or neither is: Either the set is empty, or it's not. But we check both
       * to make the nullness checker happy.
       */
      throw new NoSuchElementException();
    }
    return Range.create(firstEntry.getValue().lowerBound, lastEntry.getValue().upperBound);
  }

  @Override
  public void add(Range<C> rangeToAdd) {