Method onResultOf

output/java_guava/1.4.18/Ordering.java:425–428

Returns a new ordering on F which orders elements by first applying a function to them, then comparing those results using this. For example, to compare objects by their string forms, in a case-insensitive manner, use: {@code Ordering.from(String.CASE_INSENSITIVE_ORDER)

(Function<F, ? extends T> function)

   */

  @GwtCompatible(serializable = true)
  public <F> Ordering<F> onResultOf(Function<F, ? extends T> function) {
    return new ByFunctionOrdering<F, T>(function, this);
  }

  <T2 extends T> Ordering<Map.Entry<T2, ?>> onKeys() {
    return onResultOf(Maps.<T2>keyFunction());