return file(new File(first), more);
  }

  /** Returns a {@code File} object for the given path parts. */
  private static File file(File first, String... more) {
    // not very efficient, but should definitely be correct
    File file = first;
    for (String name : more) {
      file = new File(file, name);
    }
    return file;
  }

        }
        return null;
      }

      @Override
      public @Nullable V remove(@Nullable Object key) {
        V value = get(key);
        if (value != null) {
          // it's definitely in the map, so the cast and requireNonNull are safe
          @SuppressWarnings("unchecked")
          Range<K> range = (Range<K>) requireNonNull(key);
          TreeRangeMap.this.remove(range);
          return value;

     */
    private boolean isParentInReactor(Element parentElement, Map<Path, Document> pomMap, UpgradeContext context) {
        // If relativePath is explicitly set to empty, parent is definitely external
        String relativePath = parentElement.childText(MavenPomElements.Elements.RELATIVE_PATH);
        if (relativePath != null && relativePath.trim().isEmpty()) {
            return false;
        }

    return file(new File(first), more);
  }

  /** Returns a {@code File} object for the given path parts. */
  private static File file(File first, String... more) {
    // not very efficient, but should definitely be correct
    File file = first;
    for (String name : more) {
      file = new File(file, name);
    }
    return file;
  }

        return false;
      }
    }

    @Override
    int indexOf(@Nullable Object target) {
      if (contains(target)) {
        @SuppressWarnings("unchecked") // if it's contained, it's definitely a C
        C c = (C) requireNonNull(target);
        long total = 0;
        for (Range<C> range : ranges) {
          if (range.contains(c)) {

    }

    /**
     * Waits for the crawling process to terminate indefinitely.
     */
    public void awaitTermination() {
        awaitTermination(0);
    }

    /**
     * Waits for the crawling process to terminate for a specified duration.
     * @param millis The maximum time to wait in milliseconds. A value of 0 means wait indefinitely.
     */
    public void awaitTermination(final long millis) {

   *
   * <p>If, at any step of the process, the calling thread is interrupted, the method calls {@link
   * ExecutorService#shutdownNow()} and returns.
   *
   * <p>For a version of this method that waits <i>indefinitely</i>, use {@link
   * ExecutorService#close}.
   *
   * @param service the {@code ExecutorService} to shut down
   * @param timeout the maximum time to wait for the {@code ExecutorService} to terminate

      return ((Set<?>) iterable).contains(element) ? 1 : 0;
    }
    return Iterators.frequency(iterable.iterator(), element);
  }

  /**
   * Returns an iterable whose iterators cycle indefinitely over the elements of {@code iterable}.
   *
   * <p>That iterator supports {@code remove()} if {@code iterable.iterator()} does. After {@code

      // though that isn't currently publicly documented.
      count++;
    }
    return count;
  }

  /**
   * Returns an iterator that cycles indefinitely over the elements of {@code iterable}.
   *
   * <p>The returned iterator supports {@code remove()} if the provided iterator does. After {@code

 * that provide readers that are:
 *
 * <ul>
 *   <li><b>Finite:</b> Many operations, such as {@link #length()} and {@link #read()}, will either
 *       block indefinitely or fail if the source creates an infinite reader.
 *   <li><b>Non-destructive:</b> A <i>destructive</i> reader will consume or otherwise alter the