ImmutableMapFactory { public static <K, V> ImmutableMap<K, V> parse( String s, Function<String, K> keyParser, Function<String, V> valueParser) { return parseAndFilter(s, keyParser, valueParser, (x, y) -> true); }  static ImmutableMap<L, W> create(
            Map<K, V> baseMap,
            BiFunction<? super K, ? super V, ? extends L> keyCreator,
            BiFunction<? super K, ? super V, ? extends W> valueCreator); static ImmutableMap<L, W> create(
            Map<K, V> baseMap,
            Function<? super K, ? extends L> keyMapper,
            Function<? super V, ? extends W> valueMapper); static ImmutableMap<L, W> createAndReduceCollisions(
            Map<K, V> baseMap,
            Function<? super K, ? extends L> keyMapper,
            Function<? super V, ? extends W> valueMapper,
            W valueIdentity,
            BinaryOperator<W> collidingKeysAccumulator); static ImmutableMap<L, V> createWithNewKeys(
            Map<K, V> baseMap,
            Function<? super K, ? extends L> keyMapper); static ImmutableMap<K, W> createWithNewValues(
            Map<K, V> baseMap,
            Function<? super V, ? extends W> valueMapper); static ImmutableMap<K, W> createWithNewValues(
            Map<K, V> baseMap,
            BiFunction<? super K, ? super V, ? extends W> valueMapper); static ImmutableMap<K, V> createFromKeys(
            Collection<K> keys,
            Supplier<V> valueSupplier); static ImmutableMap<K, V> createFromKeys(
            Collection<K> keys,
            Function<K, V> valueCreator); static ImmutableMap<K, V> zip(
            List<K> keys,
            List<V> values); static ImmutableMap<K, V> filter(
            Map<K, V> baseMap,
            BiPredicate<K, V> filter); static ImmutableMap<K, V> filterByKeys(
            Map<K, V> baseMap,
            Predicate<K> keyFilter); static ImmutableMap<K, V> filterByValues(
            Map<K, V> baseMap,
            Predicate<V> valueFilter); static ImmutableMap<K, V> parse(
            String s,
            Function<String, K> keyParser,
            Function<String, V> valueParser); static ImmutableMap<K, V> parseAndFilter(
            String s,
            Function<String, K> keyParser,
            Function<String, V> valueParser,
            BiPredicate<K, V> filter);  }
@Test void testParse() { String toParse = "A:1;B:2"; ImmutableMap<String, Integer> parsed = ImmutableMapFactory.parse( toParse, s -> s, Integer::parseInt); Assertions.assertEquals(ImmutableMap.of("A", 1, "B", 2), parsed); String composed = composeString( parsed, s -> s, i -> Integer.toString(i)); Assertions.assertEquals(toParse, composed); }
@Test void testParseOneObject() { String toParse = "A:1"; ImmutableMap<String, Integer> parsed = ImmutableMapFactory.parse( toParse, s -> s, Integer::parseInt); Assertions.assertEquals(ImmutableMap.of("A", 1), parsed); }