Method span

guava/src/com/google/common/collect/TreeRangeMap.java:195–205

()

  }

  @Override
  public Range<K> span() {
    Entry<Cut<K>, RangeMapEntry<K, V>> firstEntry = entriesByLowerBound.firstEntry();
    Entry<Cut<K>, RangeMapEntry<K, V>> lastEntry = entriesByLowerBound.lastEntry();
    // Either both are null or neither is, but we check both to satisfy the nullness checker.
    if (firstEntry == null || lastEntry == null) {
      throw new NoSuchElementException();
    }
    return Range.create(
        firstEntry.getValue().getKey().lowerBound, lastEntry.getValue().getKey().upperBound);
  }

  private void putRangeMapEntry(Cut<K> lowerBound, Cut<K> upperBound, V value) {
    entriesByLowerBound.put(lowerBound, new RangeMapEntry<K, V>(lowerBound, upperBound, value));