/**
* Maps generated Ts to Us.
*
* @param mapper A function that maps a generated T to a new generator which generates objects of
* type U.
* @param <U> Type of generated objects of the new generator
* @return A new generator
*/
@SuppressWarnings("unchecked")
@Override
default <U> Gen<U> flatMap(
Function<? super T, ? extends java.lang.Iterable<? extends U>> mapper) {
Objects.requireNonNull(mapper, "mapper is null");
return random -> {
final Iterable<? extends U> iterable = mapper.apply(apply(random));
if (iterable instanceof Gen) {
return ((Gen<U>) iterable).apply(random);
} else {
return Value.get(iterable);
}
};
}
@SuppressWarnings("unchecked")
default <U> Try<U> flatMapTry(
CheckedFunction<? super T, ? extends java.lang.Iterable<? extends U>> mapper) {
if (isFailure()) {
return (Failure<U>) this;
} else {
try {
final Iterable<? extends U> iterable = mapper.apply(get());
if (iterable instanceof Value) {
return ((Value<U>) iterable).toTry();
} else {
return Try.of(() -> Value.get(iterable));
}
} catch (Throwable t) {
return new Failure<>(t);
}
}
}