/**
* このベクトルに対して二項演算を行う。
*
* <p>デフォルトの実装では、渡された演算をそれぞれの次元に適用し、得られた値を{@link #set(Object, Object, Object, Object)}に委譲します。
*
* @param operator 現在の設定値を受け取り、新しい設定値を返す関数。
* @param x 右辺となるx成分の値。
* @param y 右辺となるy成分の値。
* @param z 右辺となるz成分の値。
* @param w 右辺となるw成分の値。
*/
default void calculate(BinaryOperator<T> operator, T x, T y, T z, T w) {
set(
operator.apply(getX(), x),
operator.apply(getY(), y),
operator.apply(getZ(), z),
operator.apply(getW(), w));
}
private T evaluate(int level) {
Deque<T> q = elements[level];
BinaryOperator<T> op = operations[level];
T result = q.pollFirst();
while (!q.isEmpty()) {
result = op.apply(result, q.pollFirst());
}
return result;
}
// l + <first|acc|last> + r
private R connectOne(T first, R acc, T last) {
synchronized (root) {
Connector<T, R> l = left;
if (l == null) {
return pushRight(acc, last);
}
if (l.acc == NONE) {
l.acc = acc;
l.left = first;
l.right = last;
return connectEmpty();
}
T laright = l.right;
if (mergeable.test(laright, first)) {
l.acc = combiner.apply(l.acc, acc);
l.right = last;
return connectEmpty();
}
left = null;
l.rhs = null;
l.right = none();
if (l.left != NONE) {
return pushRight(acc, last);
}
acc = pushRight(acc, last);
if (acc != NONE) left = new Connector<>(null, acc, this);
return l.drain();
}
}
// <?|acc|last> + r
private R pushRight(R acc, T last) {
cur = none();
if (right == null) return acc;
synchronized (root) {
Connector<T, R> r = right;
if (r == null) return acc;
right = null;
r.lhs = null;
T raleft = r.left;
r.left = none();
if (r.acc == NONE) {
if (acc == NONE) {
r.drain();
} else {
r.acc = acc;
r.right = last;
}
return none();
}
if (acc == NONE) {
return r.drainRight();
}
if (mergeable.test(last, raleft)) {
r.acc = combiner.apply(acc, r.acc);
return r.drainRight();
}
if (r.right == NONE) right = new Connector<>(this, r.drain(), null);
return acc;
}
}
default U reduce(U identity, BinaryOperator<U> accumulator) {
if (getLastActive().isSequential()) {
Object[] result = {identity};
forEach(
r -> {
if (result[0] == null) result[0] = r;
else {
result[0] = accumulator.apply((U) result[0], r);
}
});
return (U) result[0];
}
Function<FastFuture, U> safeJoin =
(FastFuture cf) -> (U) BlockingStreamHelper.getSafe(cf, getErrorHandler());
IncrementalReducer<U> collector =
new IncrementalReducer(
this.getLazyCollector().get().withResults(new ArrayList<>()),
this,
getParallelReduction());
Object[] result = {identity};
try {
this.getLastActive()
.injectFutures()
.forEach(
next -> {
collector.getConsumer().accept(next);
result[0] = collector.reduce(safeJoin, (U) result[0], accumulator);
});
} catch (SimpleReactProcessingException e) {
}
return collector.reduceResults(
collector.getConsumer().getAllResults(), safeJoin, (U) result[0], accumulator);
}
// l + r
private R connectEmpty() {
synchronized (root) {
Connector<T, R> l = left, r = right;
if (l == null) {
return pushRight(none(), none());
}
left = right = null;
l.rhs = null;
T laright = l.right;
l.right = none();
if (l.acc == NONE) {
if (r == null) l.drain();
else {
if (l.lhs != null) {
l.lhs.right = r;
r.lhs = l.lhs;
}
}
return none();
}
if (r == null) {
return l.drainLeft();
}
r.lhs = null;
if (r.acc == NONE) {
if (r.rhs != null) {
r.rhs.left = l;
l.rhs = r.rhs;
l.right = laright;
}
return none();
}
T raleft = r.left;
r.left = none();
if (mergeable.test(laright, raleft)) {
R acc = combiner.apply(l.acc, r.acc);
if (l.left == NONE && r.right == NONE) {
l.drain();
r.drain();
return acc;
}
l.acc = acc;
l.right = r.right;
if (r.rhs != null) {
r.rhs.left = l;
l.rhs = r.rhs;
}
return none();
}
if (l.left == NONE) {
if (r.right == NONE) right = new Connector<>(this, r.drain(), null);
return l.drain();
}
return r.drainRight();
}
}
@Test
public void binary_operatior_test() throws Exception {
BinaryOperator.maxBy(
new Comparator<String>() {
@Override
public int compare(String o1, String o2) {
return 0; // Does not matter.
}
})
.apply("hello", "world");
}
@Override
public Set<Integer> onIntermediateResult(Address address, R results) {
if (results != null) {
synchronized (this) {
if (currentValue != null) {
currentValue = binaryOperator.apply(currentValue, results);
} else {
currentValue = results;
}
}
}
return null;
}
public static void main(String[] args) {
final List<Person> people =
Arrays.asList(
new Person("Robert", 49),
new Person("John", 20),
new Person("Sara", 21),
new Person("Chloe", 18),
new Person("Jane", 21),
new Person("Greg", 35));
List<Person> olderThan20_a = new ArrayList<>();
people.stream().filter(person -> person.age > 20).forEach(person -> olderThan20_a.add(person));
printPeople("don't trust olderThan20_a", olderThan20_a);
List<Person> olderThan20_b =
people
.stream()
.filter(person -> person.age > 20)
.collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
printPeople("don't trust olderThan20_b", olderThan20_b);
List<Person> olderThan20_c =
people.stream().filter(person -> person.age > 20).collect(Collectors.toList());
printPeople("don't trust olderThan20_c", olderThan20_c);
Map<Integer, List<Person>> peopleByAge =
people.stream().collect(Collectors.groupingBy(person -> person.age));
System.out.println("Grouped by age: " + peopleByAge);
Map<Integer, List<String>> nameOfPeopleByAge =
people
.stream()
.collect(
Collectors.groupingBy(
person -> person.age,
Collectors.mapping(person -> person.name, Collectors.toList())));
System.out.println("People grouped by age: " + nameOfPeopleByAge);
// Group the names by their first char and then get the oldest person in
// each group
Comparator<Person> byAge = Comparator.comparing(person -> person.age);
Map<Character, Optional<Person>> oldestPersonOfEachLetter =
people
.stream()
.collect(
Collectors.groupingBy(
person -> person.name.charAt(0),
Collectors.reducing(BinaryOperator.maxBy(byAge))));
System.out.println("Oldest person of each letter:");
System.out.println(oldestPersonOfEachLetter);
}
public static void main(String[] args) {
final List<Person> people =
Arrays.asList(
new Person("John", 20),
new Person("Sara", 21),
new Person("Jane", 21),
new Person("Greg", 35));
List<Person> olderThan20 =
people
.stream()
.filter(person -> person.getAge() > 20)
.collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
System.out.println("People older than 20: " + olderThan20);
List<Person> olderThan20_1 =
people.stream().filter(person -> person.getAge() > 20).collect(Collectors.toList());
System.out.println("People older than 20: " + olderThan20_1);
Map<Integer, List<Person>> peopleByAge =
people.stream().collect(Collectors.groupingBy(Person::getAge));
System.out.println("Grouped by age: " + peopleByAge);
Map<Integer, List<String>> nameOfPeopleByAge =
people
.stream()
.collect(
Collectors.groupingBy(
Person::getAge, Collectors.mapping(Person::getName, Collectors.toList())));
System.out.println("People name grouped by age: " + nameOfPeopleByAge);
Comparator<Person> byAge = Comparator.comparing(Person::getAge);
Map<Character, Optional<Person>> oldestPersonOfEachCharacter =
people
.stream()
.collect(
Collectors.groupingBy(
person -> person.getName().charAt(0),
Collectors.reducing(BinaryOperator.maxBy(byAge))));
System.out.println("Oldest person of each letter: " + oldestPersonOfEachCharacter);
}
default Optional<U> reduce(BinaryOperator<U> accumulator) {
if (getLastActive().isSequential()) {
Object[] result = {null};
forEach(
r -> {
if (result[0] == null) result[0] = r;
else {
result[0] = accumulator.apply((U) result[0], r);
}
});
return (Optional) Optional.ofNullable(result[0]);
}
Function<FastFuture, U> safeJoin =
(FastFuture cf) -> (U) BlockingStreamHelper.getSafe(cf, getErrorHandler());
IncrementalReducer<U> collector =
new IncrementalReducer(
this.getLazyCollector().get().withResults(new ArrayList<>()),
this,
getParallelReduction());
Optional[] result = {Optional.empty()};
try {
this.getLastActive()
.injectFutures()
.forEach(
next -> {
collector.getConsumer().accept(next);
if (!result[0].isPresent()) result[0] = collector.reduce(safeJoin, accumulator);
else result[0] = result[0].map(v -> collector.reduce(safeJoin, (U) v, accumulator));
});
} catch (SimpleReactProcessingException e) {
}
if (result[0].isPresent())
return result[0].map(
v ->
collector.reduceResults(
collector.getConsumer().getAllResults(), safeJoin, (U) v, accumulator));
return collector.reduceResults(collector.getConsumer().getAllResults(), safeJoin, accumulator);
}
public static <T> Aggregator<T, T, ?> minBy(Comparator<? super T> comparator) {
return reducing(BinaryOperator.minBy(comparator));
}
public void test() {
BinaryOperator<Long> operator = (l1, l2) -> l1 + l2;
System.out.println(operator.apply(1L, 2L));
}