@SuppressWarnings("unchecked")
@Override
public Array<T> sorted(Comparator<? super T> comparator) {
final Object[] arr = toArray(this);
Arrays.sort(arr, (o1, o2) -> comparator.compare((T) o1, (T) o2));
return wrap(arr);
}
private static int testHash() {
int errors = 0;
Object[] data = new String[] {"perfect", "ham", "THC"};
errors += ((Objects.hash((Object[]) null) == 0) ? 0 : 1);
errors += (Objects.hash("perfect", "ham", "THC") == Arrays.hashCode(data)) ? 0 : 1;
return errors;
}
@Override
public int[] toArray() {
return performOperation(
TerminalFunctions.toArrayIntFunction(),
false,
(v1, v2) -> {
int[] array = Arrays.copyOf(v1, v1.length + v2.length);
System.arraycopy(v2, 0, array, v1.length, v2.length);
return array;
},
null,
false);
}
/** This uses the public API collect which uses scan under the covers. */
@Test
public void testSeedFactory() {
Observable<List<Integer>> o =
Observable.range(1, 10)
.collect(
new Supplier<List<Integer>>() {
@Override
public List<Integer> get() {
return new ArrayList<>();
}
},
new BiConsumer<List<Integer>, Integer>() {
@Override
public void accept(List<Integer> list, Integer t2) {
list.add(t2);
}
})
.takeLast(1);
assertEquals(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), o.toBlocking().single());
assertEquals(Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10), o.toBlocking().single());
}
public class TodaysSales {
public static final List<Sale> sales =
Arrays.asList(
new Sale(
Store.KANSAS_CITY,
new Date(),
Optional.of("Sarah"),
Arrays.asList(new Item("carrot", 12.00))),
new Sale(
Store.ST_LOUIS,
new Date(),
Optional.empty(),
Arrays.asList(
new Item("carrot", 12.00), new Item("lizard", 99.99), new Item("cookie", 1.99))),
new Sale(
Store.ST_LOUIS,
new Date(),
Optional.of("Jamie"),
Arrays.asList(new Item("banana", 3.49), new Item("cookie", 1.49))));
static Stream<Sale> saleStream() {
return RandomSale.streamOf(10000);
}
public static void main(String[] args) {
// how many sales?
long saleCount = saleStream().count();
System.out.println("Count of sales: " + saleCount);
// any sales over $100?
Supplier<DoubleStream> totalStream = () -> saleStream().mapToDouble(Sale::total);
boolean bigSaleDay = totalStream.get().anyMatch(total -> total > 100.00);
System.out.println("Big sale day? " + bigSaleDay);
// maximum sale amount?
DoubleSummaryStatistics stats = totalStream.get().summaryStatistics();
System.out.println("Max sale amount: " + stats.getMax());
System.out.println("Stats on total: " + stats);
// how many items were sold today?
Supplier<Stream<Item>> itemStream = () -> saleStream().flatMap(sale -> sale.items.stream());
long itemCount = itemStream.get().count();
System.out.println("Count of items: " + itemCount);
// which different items were sold today?
String uniqueItems =
itemStream.get().map(item -> item.identity).distinct().collect(Collectors.joining(" & "));
System.out.println("Distinct items: " + uniqueItems);
// summarize sales by store
ConcurrentMap<String, DoubleSummaryStatistics> summary =
saleStream()
.parallel()
.collect(
Collectors.groupingByConcurrent(
sale -> Thread.currentThread().getName(),
Collectors.summarizingDouble(Sale::total)));
System.out.println("Summary by thread: " + summary);
summary
.keySet()
.stream()
.sorted()
.forEach(store -> System.out.println(store + " stats: " + summary.get(store)));
}
}
/**
* Creates a Array of the given elements.
*
* @param <T> Component type of the Array.
* @param elements Zero or more elements.
* @return A Array containing the given elements in the same order.
* @throws NullPointerException if {@code elements} is null
*/
@SuppressWarnings("varargs")
@SafeVarargs
public static <T> Array<T> of(T... elements) {
Objects.requireNonNull(elements, "elements is null");
return wrap(Arrays.copyOf(elements, elements.length));
}
@Override
public Array<T> sorted() {
final Object[] arr = toArray(this);
Arrays.sort(arr);
return wrap(arr);
}