@Test
public void shouldCurry() {
final Function4<Object, Object, Object, Object, Object> f = (o1, o2, o3, o4) -> null;
final Function1<Object, Function1<Object, Function1<Object, Function1<Object, Object>>>>
curried = f.curried();
assertThat(curried).isNotNull();
}
@Test
public void shouldComposeWithAndThen() {
final Function4<Object, Object, Object, Object, Object> f = (o1, o2, o3, o4) -> null;
final Function1<Object, Object> after = o -> null;
final Function4<Object, Object, Object, Object, Object> composed = f.andThen(after);
assertThat(composed).isNotNull();
}
@Test
public void shouldRecognizeMemoizedFunctions() {
final Function4<Integer, Integer, Integer, Integer, Integer> f = (i1, i2, i3, i4) -> null;
final Function4<Integer, Integer, Integer, Integer, Integer> memo = f.memoized();
assertThat(f.isMemoized()).isFalse();
assertThat(memo.isMemoized()).isTrue();
}
@Test
public void shouldPartiallyApply() {
final Function4<Object, Object, Object, Object, Object> f = (o1, o2, o3, o4) -> null;
assertThat(f.apply(null)).isNotNull();
assertThat(f.apply(null, null)).isNotNull();
assertThat(f.apply(null, null, null)).isNotNull();
}
@Test
public void shouldLiftPartialFunction() {
assertThat(
Function4.lift(
(o1, o2, o3, o4) -> {
while (true) ;
}))
.isNotNull();
}
@Test
public void shouldCreateFromMethodReference() {
class Type {
Object methodReference(Object o1, Object o2, Object o3, Object o4) {
return null;
}
}
final Type type = new Type();
assertThat(Function4.of(type::methodReference)).isNotNull();
}
@Test
public void shouldMemoize() {
final AtomicInteger integer = new AtomicInteger();
final Function4<Integer, Integer, Integer, Integer, Integer> f =
(i1, i2, i3, i4) -> i1 + i2 + i3 + i4 + integer.getAndIncrement();
final Function4<Integer, Integer, Integer, Integer, Integer> memo = f.memoized();
// should apply f on first apply()
final int expected = memo.apply(1, 2, 3, 4);
// should return memoized value of second apply()
assertThat(memo.apply(1, 2, 3, 4)).isEqualTo(expected);
// should calculate new values when called subsequently with different parameters
assertThat(memo.apply(2, 3, 4, 5)).isEqualTo(2 + 3 + 4 + 5 + 1);
// should return memoized value of second apply() (for new value)
assertThat(memo.apply(2, 3, 4, 5)).isEqualTo(2 + 3 + 4 + 5 + 1);
}
@Test
public void shouldLiftTryPartialFunction() {
AtomicInteger integer = new AtomicInteger();
Function4<Integer, Integer, Integer, Integer, Integer> divByZero =
(i1, i2, i3, i4) -> 10 / integer.get();
Function4<Integer, Integer, Integer, Integer, Try<Integer>> divByZeroTry =
Function4.liftTry(divByZero);
Try<Integer> res = divByZeroTry.apply(0, 0, 0, 0);
assertThat(res.isFailure()).isTrue();
assertThat(res.getCause()).isNotNull();
assertThat(res.getCause().getMessage()).isEqualToIgnoringCase("/ by zero");
integer.incrementAndGet();
res = divByZeroTry.apply(1, 2, 3, 4);
assertThat(res.isSuccess()).isTrue();
assertThat(res.get()).isEqualTo(10);
}
private boolean forEachConstraintRecursively(Function4 block) {
Queue4 queue = new NoDuplicatesQueue(new NonblockingQueue());
Iterator4 constrIter = iterateConstraints();
while (constrIter.moveNext()) {
queue.add(constrIter.current());
}
while (queue.hasNext()) {
QCon constr = (QCon) queue.next();
Boolean cancel = (Boolean) block.apply(constr);
if (cancel.booleanValue()) {
return true;
}
Iterator4 childIter = constr.iterateChildren();
while (childIter.moveNext()) {
queue.add(childIter.current());
}
Iterator4 joinIter = constr.iterateJoins();
while (joinIter.moveNext()) {
queue.add(joinIter.current());
}
}
return false;
}
@Test
public void shouldNotMemoizeAlreadyMemoizedFunction() {
final Function4<Integer, Integer, Integer, Integer, Integer> f = (i1, i2, i3, i4) -> null;
final Function4<Integer, Integer, Integer, Integer, Integer> memo = f.memoized();
assertThat(memo.memoized() == memo).isTrue();
}
@Test
public void shouldReverse() {
final Function4<Object, Object, Object, Object, Object> f = (o1, o2, o3, o4) -> null;
assertThat(f.reversed()).isNotNull();
}
@Test
public void shouldMemoizeValueGivenNullArguments() {
final Function4<Integer, Integer, Integer, Integer, Integer> f = (i1, i2, i3, i4) -> null;
final Function4<Integer, Integer, Integer, Integer, Integer> memo = f.memoized();
assertThat(memo.apply(null, null, null, null)).isNull();
}
@Test
public void shouldTuple() {
final Function4<Object, Object, Object, Object, Object> f = (o1, o2, o3, o4) -> null;
final Function1<Tuple4<Object, Object, Object, Object>, Object> tupled = f.tupled();
assertThat(tupled).isNotNull();
}
@Test
public void shouldCalculatedRecursively() {
assertThat(recurrent1.apply(11, 11, 11, 11)).isEqualTo(11);
assertThat(recurrent1.apply(22, 22, 22, 22)).isEqualTo(22);
}
@Test
public void shouldConstant() {
final Function4<Object, Object, Object, Object, Object> f = Function4.constant(6);
assertThat(f.apply(1, 2, 3, 4)).isEqualTo(6);
}
@Test
public void shouldGetArity() {
final Function4<Object, Object, Object, Object, Object> f = (o1, o2, o3, o4) -> null;
assertThat(f.arity()).isEqualTo(4);
}
public Test transmogrify(Function4<Test, Test> fun) {
return fun.apply(this);
}