из дыбра Франца Кафки

"Сэр Томас не любил проливать кровь."

set of pairs to map conversion

All details are here

Categorical approach does change programming style... Everything's lazy here.

  public static <X, Y> Map<X, Y> Map(final Set<Pair<X, Y>> pairs) {
    final Function<Pair<X, Y>, Map.Entry<X, Y>> idmap = Function.id();

    return new AbstractMap<X, Y>() {
      public Set<Entry<X, Y>> entrySet() {
        return idmap.map(pairs);
      }
    };
  }

where
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