/** * Create a {@link Tuple4} with the given objects. * * @param t1 The first value in the tuple. Not null. * @param t2 The second value in the tuple. Not null. * @param t3 The third value in the tuple. Not null. * @param t4 The fourth value in the tuple. Not null. * @param <T1> The type of the first value. * @param <T2> The type of the second value. * @param <T3> The type of the third value. * @param <T4> The type of the fourth value. * @return The new {@link Tuple4}. */ public static <T1, T2, T3, T4> Tuple4<T1, T2, T3, T4> of(T1 t1, T2 t2, T3 t3, T4 t4) { return new Tuple4<>(t1, t2, t3, t4); }
/** * Map the 2nd part (T2) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T2 part * @param <R> the new type for the T2 part * @return a new {@link Tuple4} with a different T2 value */ public <R> Tuple4<T1, R, T3, T4> mapT2(Function<T2, R> mapper) { return new Tuple4<>(t1, mapper.apply(t2), t3, t4); }
/** * Map the 3rd part (T3) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T3 part * @param <R> the new type for the T3 part * @return a new {@link Tuple4} with a different T3 value */ public <R> Tuple4<T1, T2, R, T4> mapT3(Function<T3, R> mapper) { return new Tuple4<>(t1, t2, mapper.apply(t3), t4); }
/** * Map the 4th part (T4) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T4 part * @param <R> the new type for the T4 part * @return a new {@link Tuple4} with a different T4 value */ public <R> Tuple4<T1, T2, T3, R> mapT4(Function<T4, R> mapper) { return new Tuple4<>(t1, t2, t3, mapper.apply(t4)); }
/** * Map the 1st part (T1) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T1 part * @param <R> the new type for the T1 part * @return a new {@link Tuple4} with a different T1 value */ public <R> Tuple4<R, T2, T3, T4> mapT1(Function<T1, R> mapper) { return new Tuple4<>(mapper.apply(t1), t2, t3, t4); }
@Test public void fn4Delegate() { Integer[] source = new Integer[] { 1, 2, 3, 4, 5, 6, 7, 8 }; Function<Tuple4<Integer, Integer, Integer, Integer>, Tuple4> invert = t4 -> new Tuple4<>(t4.getT4(), t4.getT3(), t4.getT2(), t4.getT1()); Tuple4 tuple = Tuples.fn4(invert).apply(source); assertThat(tuple.getT1()).isEqualTo(4); assertThat(tuple.getT2()).isEqualTo(3); assertThat(tuple.getT3()).isEqualTo(2); assertThat(tuple.getT4()).isEqualTo(1); assertThat((Object) tuple).isExactlyInstanceOf(Tuple4.class); }
@Test public void nullT4Rejected() { assertThatExceptionOfType(NullPointerException.class) .isThrownBy(() -> new Tuple4<>(1, 2, 3, null)) .withMessage("t4"); }
/** * Create a {@link Tuple4} with the given objects. * * @param t1 The first value in the tuple. Not null. * @param t2 The second value in the tuple. Not null. * @param t3 The third value in the tuple. Not null. * @param t4 The fourth value in the tuple. Not null. * @param <T1> The type of the first value. * @param <T2> The type of the second value. * @param <T3> The type of the third value. * @param <T4> The type of the fourth value. * @return The new {@link Tuple4}. */ public static <T1, T2, T3, T4> Tuple4<T1, T2, T3, T4> of(T1 t1, T2 t2, T3 t3, T4 t4) { return new Tuple4<>(t1, t2, t3, t4); }
/** * Map the 2nd part (T2) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T2 part * @param <R> the new type for the T2 part * @return a new {@link Tuple4} with a different T2 value */ public <R> Tuple4<T1, R, T3, T4> mapT2(Function<T2, R> mapper) { return new Tuple4<>(t1, mapper.apply(t2), t3, t4); }
/** * Map the 4th part (T4) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T4 part * @param <R> the new type for the T4 part * @return a new {@link Tuple4} with a different T4 value */ public <R> Tuple4<T1, T2, T3, R> mapT4(Function<T4, R> mapper) { return new Tuple4<>(t1, t2, t3, mapper.apply(t4)); }
/** * Map the 3rd part (T3) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T3 part * @param <R> the new type for the T3 part * @return a new {@link Tuple4} with a different T3 value */ public <R> Tuple4<T1, T2, R, T4> mapT3(Function<T3, R> mapper) { return new Tuple4<>(t1, t2, mapper.apply(t3), t4); }
/** * Map the 1st part (T1) of this {@link Tuple4} into a different value and type, * keeping the other parts. * * @param mapper the mapping {@link Function} for the T1 part * @param <R> the new type for the T1 part * @return a new {@link Tuple4} with a different T1 value */ public <R> Tuple4<R, T2, T3, T4> mapT1(Function<T1, R> mapper) { return new Tuple4<>(mapper.apply(t1), t2, t3, t4); }