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Added flow combine extension #42

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Nov 24, 2023
Merged

Added flow combine extension #42

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92 changes: 92 additions & 0 deletions flow-extensions/src/main/java/com/revolut/flowdata/extensions/CombineContent.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,98 @@ fun <T : Any> combineContent(
)
}

inline fun <A : Any, B : Any, C : Any, D : Any, R : Any> combineContent(
a: Flow<Data<A>>,
b: Flow<Data<B>>,
c: Flow<Data<C>>,
d: Flow<Data<D>>,
crossinline block: suspend (A, B, C, D) -> R,
): Flow<Data<R>> = combineContent(combineContent(a, b, c), d)
.mapContentSuspended { (abc, d) -> block(abc.first, abc.second, abc.third, d) }

inline fun <A : Any, B : Any, C : Any, D : Any, E : Any, R : Any> combineContent(
a: Flow<Data<A>>,
b: Flow<Data<B>>,
c: Flow<Data<C>>,
d: Flow<Data<D>>,
e: Flow<Data<E>>,
crossinline block: suspend (A, B, C, D, E) -> R,
): Flow<Data<R>> = combineContent(combineContent(a, b, c), combineContent(d, e))
.mapContentSuspended { (abc, de) -> block(abc.first, abc.second, abc.third, de.first, de.second) }

inline fun <A : Any, B : Any, C : Any, D : Any, E : Any, F : Any, R : Any> combineContent(
a: Flow<Data<A>>,
b: Flow<Data<B>>,
c: Flow<Data<C>>,
d: Flow<Data<D>>,
e: Flow<Data<E>>,
f: Flow<Data<F>>,
crossinline block: suspend (A, B, C, D, E, F) -> R,
): Flow<Data<R>> = combineContent(combineContent(a, b, c), combineContent(d, e, f))
.mapContentSuspended { (abc, def) -> block(abc.first, abc.second, abc.third, def.first, def.second, def.third) }

inline fun <A : Any, B : Any, C : Any, D : Any, E : Any, F : Any, G : Any, R : Any> combineContent(
a: Flow<Data<A>>,
b: Flow<Data<B>>,
c: Flow<Data<C>>,
d: Flow<Data<D>>,
e: Flow<Data<E>>,
f: Flow<Data<F>>,
g: Flow<Data<G>>,
crossinline block: suspend (A, B, C, D, E, F, G) -> R,
): Flow<Data<R>> = combineContent(combineContent(a, b, c), combineContent(d, e, f), g)
.mapContentSuspended { (abc, def, g) -> block(abc.first, abc.second, abc.third, def.first, def.second, def.third, g) }

inline fun <A : Any, B : Any, C : Any, D : Any, E : Any, F : Any, G : Any, H : Any, R : Any> combineContent(
a: Flow<Data<A>>,
b: Flow<Data<B>>,
c: Flow<Data<C>>,
d: Flow<Data<D>>,
e: Flow<Data<E>>,
f: Flow<Data<F>>,
g: Flow<Data<G>>,
h: Flow<Data<H>>,
crossinline block: suspend (A, B, C, D, E, F, G, H) -> R,
): Flow<Data<R>> = combineContent(combineContent(a, b, c), combineContent(d, e, f), combineContent(g, h))
.mapContentSuspended { (abc, def, gh) ->
block(
abc.first,
abc.second,
abc.third,
def.first,
def.second,
def.third,
gh.first,
gh.second
)
}

inline fun <A : Any, B : Any, C : Any, D : Any, E : Any, F : Any, G : Any, H : Any, I : Any, R : Any> combineContent(
a: Flow<Data<A>>,
b: Flow<Data<B>>,
c: Flow<Data<C>>,
d: Flow<Data<D>>,
e: Flow<Data<E>>,
f: Flow<Data<F>>,
g: Flow<Data<G>>,
h: Flow<Data<H>>,
i: Flow<Data<I>>,
crossinline block: suspend (A, B, C, D, E, F, G, H, I) -> R,
): Flow<Data<R>> = combineContent(combineContent(a, b, c), combineContent(d, e, f), combineContent(g, h, i))
.mapContentSuspended { (abc, def, ghi) ->
block(
abc.first,
abc.second,
abc.third,
def.first,
def.second,
def.third,
ghi.first,
ghi.second,
ghi.third
)
}

fun <T : Any> combineContent(
vararg flows: Flow<Data<T>>
): Flow<Data<List<T>>> = combineContent(flows.toList())
93 changes: 93 additions & 0 deletions ...xtensions/src/test/kotlin/com/revolut/flowdata/extensions/CombineContentKtIterableTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,99 @@ class CombineContentKtIterableTest {
Assertions.assertEquals(combinedListData, combinedTripleData)
}

@Test
fun `Combined value should be the same for quadruple and content`() = runTest {
val content = combineContent(
flowOf(Data("a")),
flowOf(Data("b")),
flowOf(Data("c")),
flowOf(Data("d")),
) { a, b, c, d -> a + b + c + d }
.first()

Assertions.assertEquals(content, Data("abcd"))
}

@Test
fun `Combined value should be the same for quintuple and content`() = runTest {
val content = combineContent(
flowOf(Data("a")),
flowOf(Data("b")),
flowOf(Data("c")),
flowOf(Data("d")),
flowOf(Data("e")),
) { a, b, c, d, e -> a + b + c + d + e }
.first()

Assertions.assertEquals(content, Data("abcde"))
}

@Test
fun `Combined value should be the same for sextuple and content`() = runTest {
val content = combineContent(
flowOf(Data("a")),
flowOf(Data("b")),
flowOf(Data("c")),
flowOf(Data("d")),
flowOf(Data("e")),
flowOf(Data("f")),
) { a, b, c, d, e, f -> a + b + c + d + e + f }
.first()

Assertions.assertEquals(content, Data("abcdef"))
}

@Test
fun `Combined value should be the same for septuple and content`() = runTest {
val content = combineContent(
flowOf(Data("a")),
flowOf(Data("b")),
flowOf(Data("c")),
flowOf(Data("d")),
flowOf(Data("e")),
flowOf(Data("f")),
flowOf(Data("g")),
) { a, b, c, d, e, f, g -> a + b + c + d + e + f + g }
.first()

Assertions.assertEquals(content, Data("abcdefg"))
}

@Test
fun `Combined value should be the same for octuple and content`() = runTest {
val content = combineContent(
flowOf(Data("a")),
flowOf(Data("b")),
flowOf(Data("c")),
flowOf(Data("d")),
flowOf(Data("e")),
flowOf(Data("f")),
flowOf(Data("g")),
flowOf(Data("h")),
) { a, b, c, d, e, f, g, h -> a + b + c + d + e + f + g + h }
.first()

Assertions.assertEquals(content, Data("abcdefgh"))
}

@Test
fun `Combined value should be the same for nonuple and content`() = runTest {
val content = combineContent(
flowOf(Data("a")),
flowOf(Data("b")),
flowOf(Data("c")),
flowOf(Data("d")),
flowOf(Data("e")),
flowOf(Data("f")),
flowOf(Data("g")),
flowOf(Data("h")),
flowOf(Data("i")),
) { a, b, c, d, e, f, g, h, i -> a + b + c + d + e + f + g + h + i }
.first()

Assertions.assertEquals(content, Data("abcdefghi"))
}

@Test
fun `Combined value should be the same for vararg and list parameters`() = runFlowTest(testCombined) {
flows.forEachIndexed { index, flow -> flow.emit(Data("$index")) }
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