void setServlets(List<Servlet> servlets) {
this.servlets = servlets;
servlets.sort(
Comparator.<Servlet>comparingInt(
s -> {
Servlet.Priority priority = s.getClass().getAnnotation(Servlet.Priority.class);
return priority == null ? 0 : priority.value();
}));
}
public void testMinBy() {
Comparator<People> cmp = Comparator.comparing(People::getFirstName);
// lesser
assertSame(minBy(cmp).apply(people[0], people[1]), people[0]);
// euqal
cmp = Comparator.comparing(People::getLastName);
assertSame(minBy(cmp).apply(people[0], people[1]), people[0]);
// greater
cmp = Comparator.comparingInt(People::getAge);
assertSame(minBy(cmp).apply(people[0], people[1]), people[1]);
}
@Test
public void testCollectors() {
ArrayList<Person> people = new ArrayList<>();
ArrayList<Integer> things = new ArrayList<>();
ArrayList<Employee> employees = new ArrayList<>();
ArrayList<Student> students = new ArrayList<>();
// Accumulate names into a List
List<String> list = people.stream().map(Person::getName).collect(Collectors.toList());
// Accumulate names into a TreeSet
Set<String> list2 =
people.stream().map(Person::getName).collect(Collectors.toCollection(TreeSet::new));
// Convert elements to strings and concatenate them, separated by commas
String joined = things.stream().map(Object::toString).collect(Collectors.joining(", "));
// Find highest-paid employee
Optional<Employee> highestPaid =
employees.stream().collect(Collectors.maxBy(Comparator.comparingInt(Employee::getSalary)));
// Group employees by department
Map<Department, List<Employee>> byDept =
employees.stream().collect(Collectors.groupingBy(Employee::getDepartment));
// Find highest-paid employee by department
Map<Department, Optional<Employee>> highestPaidByDept =
employees
.stream()
.collect(
Collectors.groupingBy(
Employee::getDepartment,
Collectors.maxBy(Comparator.comparingInt(Employee::getSalary))));
// Partition students into passing and failing
Map<Boolean, List<Student>> passingFailing =
students.stream().collect(Collectors.partitioningBy(s -> s.getGrade() >= PASS_THRESHOLD));
}
@Benchmark
public void parallel_lazy_jdk() {
Map<Alphagram, List<String>> groupBy =
this.guavaWords.parallelStream().collect(Collectors.groupingBy(Alphagram::new));
groupBy
.entrySet()
.parallelStream()
.map(Map.Entry::getValue)
.filter(list -> list.size() >= SIZE_THRESHOLD)
.sorted(Comparator.<List<String>>comparingInt(List::size).reversed())
.map(list -> list.size() + ": " + list)
.forEach(e -> Assert.assertFalse(e.isEmpty()));
}
/** Modify exercise6 so that the words are sorted by length */
private void exercise7() throws IOException {
try (BufferedReader reader =
Files.newBufferedReader(getPath("Sonnetl.txt"), StandardCharsets.UTF_8)) {
reader
.lines()
.flatMap(WORD_PATTERN::splitAsStream)
.map(word -> word.toLowerCase())
// .sorted((s1, s2) -> s1.length() - s2.length())
.sorted(Comparator.comparingInt(String::length))
.distinct()
.forEach(System.out::println);
}
}
@Benchmark
public void serial_lazy_streams_ec() {
Map<Alphagram, Set<String>> groupBy =
this.ecWords
.stream()
.collect(Collectors.groupingBy(Alphagram::new, Collectors.<String>toSet()));
groupBy
.entrySet()
.stream()
.map(Map.Entry::getValue)
.filter(list -> list.size() >= SIZE_THRESHOLD)
.sorted(Comparator.<Set<String>>comparingInt(Set::size).reversed())
.map(list -> list.size() + ": " + list)
.forEach(e -> Assert.assertFalse(e.isEmpty()));
}
private void orderMoves(Move[] moves, int numberOfMoves) {
TableEntry tableEntry = transpositionTable.get(pos.key);
for (int i = 0; i < numberOfMoves; i++) {
Move move = moves[i];
if (tableEntry != null) {
if (move.from == tableEntry.getFrom() && move.to == tableEntry.getTo()) {
move.ordering += 10000;
}
}
if (move.capturedPiece != PieceType.None) {
move.ordering += move.capturedPiece.getValue();
}
}
Arrays.sort(moves, 0, numberOfMoves, Comparator.comparingInt(m -> m.ordering));
}
@Test
public void testMaxAll() {
List<String> input = Arrays.asList("a", "bb", "c", "", "cc", "eee", "bb", "ddd");
checkCollector(
"maxAll",
Arrays.asList("eee", "ddd"),
input::stream,
MoreCollectors.maxAll(Comparator.comparingInt(String::length)));
Collector<String, ?, String> maxAllJoin =
MoreCollectors.maxAll(Comparator.comparingInt(String::length), Collectors.joining(","));
checkCollector("maxAllJoin", "eee,ddd", input::stream, maxAllJoin);
checkCollector(
"minAll",
1L,
input::stream,
MoreCollectors.minAll(Comparator.comparingInt(String::length), Collectors.counting()));
checkCollector(
"minAllEmpty",
Arrays.asList(""),
input::stream,
MoreCollectors.minAll(Comparator.comparingInt(String::length)));
checkCollectorEmpty(
"maxAll",
Collections.emptyList(),
MoreCollectors.maxAll(Comparator.comparingInt(String::length)));
checkCollectorEmpty("maxAllJoin", "", maxAllJoin);
List<Integer> ints = IntStreamEx.of(new Random(1), 10000, 1, 1000).boxed().toList();
List<Integer> expectedMax = getMaxAll(ints, Comparator.naturalOrder());
List<Integer> expectedMin = getMaxAll(ints, Comparator.reverseOrder());
Collector<Integer, ?, SimpleEntry<Integer, Long>> downstream =
MoreCollectors.pairing(
MoreCollectors.first(),
Collectors.counting(),
(opt, cnt) -> new AbstractMap.SimpleEntry<>(opt.get(), cnt));
checkCollector("maxAll", expectedMax, ints::stream, MoreCollectors.maxAll(Integer::compare));
checkCollector("minAll", expectedMin, ints::stream, MoreCollectors.minAll());
checkCollector(
"entry",
new SimpleEntry<>(expectedMax.get(0), (long) expectedMax.size()),
ints::stream,
MoreCollectors.maxAll(downstream));
checkCollector(
"entry",
new SimpleEntry<>(expectedMin.get(0), (long) expectedMin.size()),
ints::stream,
MoreCollectors.minAll(downstream));
Integer a = new Integer(1), b = new Integer(1), c = new Integer(1000), d = new Integer(1000);
ints = IntStreamEx.range(10, 100).boxed().append(a, c).prepend(b, d).toList();
for (StreamExSupplier<Integer> supplier : streamEx(ints::stream)) {
List<Integer> list = supplier.get().collect(MoreCollectors.maxAll());
assertEquals(2, list.size());
assertSame(d, list.get(0));
assertSame(c, list.get(1));
list = supplier.get().collect(MoreCollectors.minAll());
assertEquals(2, list.size());
assertSame(b, list.get(0));
assertSame(a, list.get(1));
}
}
private List<? extends Statement> getOrderedStatements(final List<? extends Statement> stats) {
final List<? extends Statement> statList = new ArrayList<>(stats);
statList.sort(Comparator.comparingInt(Node::getSourceOrder));
return statList;
}