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io.reactivex.internal.functions.Functions Maven / Gradle / Ivy
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex.internal.functions;
import java.util.*;
import java.util.concurrent.*;
import org.reactivestreams.Subscription;
import io.reactivex.*;
import io.reactivex.exceptions.OnErrorNotImplementedException;
import io.reactivex.functions.*;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.schedulers.Timed;
/**
* Utility methods to convert the BiFunction, Function3..Function9 instances to Function of Object array.
*/
public final class Functions {
/** Utility class. */
private Functions() {
throw new IllegalStateException("No instances!");
}
public static Function toFunction(final BiFunction f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array2Func(f);
}
public static Function toFunction(final Function3 f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array3Func(f);
}
public static Function toFunction(final Function4 f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array4Func(f);
}
public static Function toFunction(final Function5 f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array5Func(f);
}
public static Function toFunction(
final Function6 f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array6Func(f);
}
public static Function toFunction(
final Function7 f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array7Func(f);
}
public static Function toFunction(
final Function8 f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array8Func(f);
}
public static Function toFunction(
final Function9 f) {
ObjectHelper.requireNonNull(f, "f is null");
return new Array9Func(f);
}
/** A singleton identity function. */
static final Function IDENTITY = new Identity();
/**
* Returns an identity function that simply returns its argument.
* @param the input and output value type
* @return the identity function
*/
@SuppressWarnings("unchecked")
public static Function identity() {
return (Function)IDENTITY;
}
public static final Runnable EMPTY_RUNNABLE = new EmptyRunnable();
public static final Action EMPTY_ACTION = new EmptyAction();
static final Consumer EMPTY_CONSUMER = new EmptyConsumer();
/**
* Returns an empty consumer that does nothing.
* @param the consumed value type, the value is ignored
* @return an empty consumer that does nothing.
*/
@SuppressWarnings("unchecked")
public static Consumer emptyConsumer() {
return (Consumer)EMPTY_CONSUMER;
}
public static final Consumer ERROR_CONSUMER = new ErrorConsumer();
/**
* Wraps the consumed Throwable into an OnErrorNotImplementedException and
* signals it to the plugin error handler.
*/
public static final Consumer ON_ERROR_MISSING = new OnErrorMissingConsumer();
public static final LongConsumer EMPTY_LONG_CONSUMER = new EmptyLongConsumer();
static final Predicate ALWAYS_TRUE = new TruePredicate();
static final Predicate ALWAYS_FALSE = new FalsePredicate();
static final Callable NULL_SUPPLIER = new NullCallable();
static final Comparator NATURAL_COMPARATOR = new NaturalObjectComparator();
@SuppressWarnings("unchecked")
public static Predicate alwaysTrue() {
return (Predicate)ALWAYS_TRUE;
}
@SuppressWarnings("unchecked")
public static Predicate alwaysFalse() {
return (Predicate)ALWAYS_FALSE;
}
@SuppressWarnings("unchecked")
public static Callable nullSupplier() {
return (Callable)NULL_SUPPLIER;
}
/**
* Returns a natural order comparator which casts the parameters to Comparable.
* @param the value type
* @return a natural order comparator which casts the parameters to Comparable
*/
@SuppressWarnings("unchecked")
public static Comparator naturalOrder() {
return (Comparator)NATURAL_COMPARATOR;
}
static final class FutureAction implements Action {
final Future future;
FutureAction(Future future) {
this.future = future;
}
@Override
public void run() throws Exception {
future.get();
}
}
/**
* Wraps the blocking get call of the Future into an Action.
* @param future the future to call get() on, not null
* @return the new Action instance
*/
public static Action futureAction(Future future) {
return new FutureAction(future);
}
static final class JustValue implements Callable, Function {
final U value;
JustValue(U value) {
this.value = value;
}
@Override
public U call() throws Exception {
return value;
}
@Override
public U apply(T t) throws Exception {
return value;
}
}
/**
* Returns a Callable that returns the given value.
* @param the value type
* @param value the value to return
* @return the new Callable instance
*/
public static Callable justCallable(T value) {
return new JustValue(value);
}
/**
* Returns a Function that ignores its parameter and returns the given value.
* @param the function's input type
* @param the value and return type of the function
* @param value the value to return
* @return the new Function instance
*/
public static Function justFunction(U value) {
return new JustValue(value);
}
static final class CastToClass implements Function {
final Class clazz;
CastToClass(Class clazz) {
this.clazz = clazz;
}
@Override
public U apply(T t) throws Exception {
return clazz.cast(t);
}
}
/**
* Returns a function that cast the incoming values via a Class object.
* @param the input value type
* @param the output and target type
* @param target the target class
* @return the new Function instance
*/
public static Function castFunction(Class target) {
return new CastToClass(target);
}
static final class ArrayListCapacityCallable implements Callable> {
final int capacity;
ArrayListCapacityCallable(int capacity) {
this.capacity = capacity;
}
@Override
public List call() throws Exception {
return new ArrayList(capacity);
}
}
public static Callable> createArrayList(int capacity) {
return new ArrayListCapacityCallable(capacity);
}
static final class EqualsPredicate implements Predicate {
final T value;
EqualsPredicate(T value) {
this.value = value;
}
@Override
public boolean test(T t) throws Exception {
return ObjectHelper.equals(t, value);
}
}
public static Predicate equalsWith(T value) {
return new EqualsPredicate(value);
}
enum HashSetCallable implements Callable> {
INSTANCE;
@Override
public Set call() throws Exception {
return new HashSet();
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static Callable> createHashSet() {
return (Callable)HashSetCallable.INSTANCE;
}
static final class NotificationOnNext implements Consumer {
final Consumer> onNotification;
NotificationOnNext(Consumer> onNotification) {
this.onNotification = onNotification;
}
@Override
public void accept(T v) throws Exception {
onNotification.accept(Notification.createOnNext(v));
}
}
static final class NotificationOnError implements Consumer {
final Consumer> onNotification;
NotificationOnError(Consumer> onNotification) {
this.onNotification = onNotification;
}
@Override
public void accept(Throwable v) throws Exception {
onNotification.accept(Notification.createOnError(v));
}
}
static final class NotificationOnComplete implements Action {
final Consumer> onNotification;
NotificationOnComplete(Consumer> onNotification) {
this.onNotification = onNotification;
}
@Override
public void run() throws Exception {
onNotification.accept(Notification.createOnComplete());
}
}
public static Consumer notificationOnNext(Consumer> onNotification) {
return new NotificationOnNext(onNotification);
}
public static Consumer notificationOnError(Consumer> onNotification) {
return new NotificationOnError(onNotification);
}
public static Action notificationOnComplete(Consumer> onNotification) {
return new NotificationOnComplete(onNotification);
}
static final class ActionConsumer implements Consumer {
final Action action;
ActionConsumer(Action action) {
this.action = action;
}
@Override
public void accept(T t) throws Exception {
action.run();
}
}
public static Consumer actionConsumer(Action action) {
return new ActionConsumer(action);
}
static final class ClassFilter implements Predicate {
final Class clazz;
ClassFilter(Class clazz) {
this.clazz = clazz;
}
@Override
public boolean test(T t) throws Exception {
return clazz.isInstance(t);
}
}
public static Predicate isInstanceOf(Class clazz) {
return new ClassFilter(clazz);
}
static final class BooleanSupplierPredicateReverse implements Predicate {
final BooleanSupplier supplier;
BooleanSupplierPredicateReverse(BooleanSupplier supplier) {
this.supplier = supplier;
}
@Override
public boolean test(T t) throws Exception {
return !supplier.getAsBoolean();
}
}
public static Predicate predicateReverseFor(BooleanSupplier supplier) {
return new BooleanSupplierPredicateReverse(supplier);
}
static final class TimestampFunction implements Function> {
final TimeUnit unit;
final Scheduler scheduler;
TimestampFunction(TimeUnit unit, Scheduler scheduler) {
this.unit = unit;
this.scheduler = scheduler;
}
@Override
public Timed apply(T t) throws Exception {
return new Timed(t, scheduler.now(unit), unit);
}
}
public static Function> timestampWith(TimeUnit unit, Scheduler scheduler) {
return new TimestampFunction(unit, scheduler);
}
static final class ToMapKeySelector implements BiConsumer, T> {
private final Function keySelector;
ToMapKeySelector(Function keySelector) {
this.keySelector = keySelector;
}
@Override
public void accept(Map m, T t) throws Exception {
K key = keySelector.apply(t);
m.put(key, t);
}
}
public static BiConsumer, T> toMapKeySelector(final Function keySelector) {
return new ToMapKeySelector(keySelector);
}
static final class ToMapKeyValueSelector implements BiConsumer, T> {
private final Function valueSelector;
private final Function keySelector;
ToMapKeyValueSelector(Function valueSelector,
Function keySelector) {
this.valueSelector = valueSelector;
this.keySelector = keySelector;
}
@Override
public void accept(Map m, T t) throws Exception {
K key = keySelector.apply(t);
V value = valueSelector.apply(t);
m.put(key, value);
}
}
public static BiConsumer, T> toMapKeyValueSelector(final Function keySelector, final Function valueSelector) {
return new ToMapKeyValueSelector(valueSelector, keySelector);
}
static final class ToMultimapKeyValueSelector implements BiConsumer>, T> {
private final Function> collectionFactory;
private final Function valueSelector;
private final Function keySelector;
ToMultimapKeyValueSelector(Function> collectionFactory,
Function valueSelector, Function keySelector) {
this.collectionFactory = collectionFactory;
this.valueSelector = valueSelector;
this.keySelector = keySelector;
}
@SuppressWarnings("unchecked")
@Override
public void accept(Map> m, T t) throws Exception {
K key = keySelector.apply(t);
Collection coll = m.get(key);
if (coll == null) {
coll = (Collection)collectionFactory.apply(key);
m.put(key, coll);
}
V value = valueSelector.apply(t);
coll.add(value);
}
}
public static BiConsumer>, T> toMultimapKeyValueSelector(
final Function keySelector, final Function valueSelector,
final Function> collectionFactory) {
return new ToMultimapKeyValueSelector(collectionFactory, valueSelector, keySelector);
}
enum NaturalComparator implements Comparator {
INSTANCE;
@SuppressWarnings("unchecked")
@Override
public int compare(Object o1, Object o2) {
return ((Comparable)o1).compareTo(o2);
}
}
@SuppressWarnings("unchecked")
public static Comparator naturalComparator() {
return (Comparator)NaturalComparator.INSTANCE;
}
static final class ListSorter implements Function, List> {
final Comparator comparator;
ListSorter(Comparator comparator) {
this.comparator = comparator;
}
@Override
public List apply(List v) {
Collections.sort(v, comparator);
return v;
}
}
public static Function, List> listSorter(final Comparator comparator) {
return new ListSorter(comparator);
}
public static final Consumer REQUEST_MAX = new MaxRequestSubscription();
static final class Array2Func implements Function {
final BiFunction f;
Array2Func(BiFunction f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 2) {
throw new IllegalArgumentException("Array of size 2 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1]);
}
}
static final class Array3Func implements Function {
final Function3 f;
Array3Func(Function3 f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 3) {
throw new IllegalArgumentException("Array of size 3 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1], (T3)a[2]);
}
}
static final class Array4Func implements Function {
final Function4 f;
Array4Func(Function4 f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 4) {
throw new IllegalArgumentException("Array of size 4 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1], (T3)a[2], (T4)a[3]);
}
}
static final class Array5Func implements Function {
private final Function5 f;
Array5Func(Function5 f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 5) {
throw new IllegalArgumentException("Array of size 5 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1], (T3)a[2], (T4)a[3], (T5)a[4]);
}
}
static final class Array6Func implements Function {
final Function6 f;
Array6Func(Function6 f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 6) {
throw new IllegalArgumentException("Array of size 6 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1], (T3)a[2], (T4)a[3], (T5)a[4], (T6)a[5]);
}
}
static final class Array7Func implements Function {
final Function7 f;
Array7Func(Function7 f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 7) {
throw new IllegalArgumentException("Array of size 7 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1], (T3)a[2], (T4)a[3], (T5)a[4], (T6)a[5], (T7)a[6]);
}
}
static final class Array8Func implements Function {
final Function8 f;
Array8Func(Function8 f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 8) {
throw new IllegalArgumentException("Array of size 8 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1], (T3)a[2], (T4)a[3], (T5)a[4], (T6)a[5], (T7)a[6], (T8)a[7]);
}
}
static final class Array9Func implements Function {
final Function9 f;
Array9Func(Function9 f) {
this.f = f;
}
@SuppressWarnings("unchecked")
@Override
public R apply(Object[] a) throws Exception {
if (a.length != 9) {
throw new IllegalArgumentException("Array of size 9 expected but got " + a.length);
}
return f.apply((T1)a[0], (T2)a[1], (T3)a[2], (T4)a[3], (T5)a[4], (T6)a[5], (T7)a[6], (T8)a[7], (T9)a[8]);
}
}
static final class Identity implements Function {
@Override
public Object apply(Object v) {
return v;
}
@Override
public String toString() {
return "IdentityFunction";
}
}
static final class EmptyRunnable implements Runnable {
@Override
public void run() { }
@Override
public String toString() {
return "EmptyRunnable";
}
}
static final class EmptyAction implements Action {
@Override
public void run() { }
@Override
public String toString() {
return "EmptyAction";
}
}
static final class EmptyConsumer implements Consumer {
@Override
public void accept(Object v) { }
@Override
public String toString() {
return "EmptyConsumer";
}
}
static final class ErrorConsumer implements Consumer {
@Override
public void accept(Throwable error) {
RxJavaPlugins.onError(error);
}
}
static final class OnErrorMissingConsumer implements Consumer {
@Override
public void accept(Throwable error) {
RxJavaPlugins.onError(new OnErrorNotImplementedException(error));
}
}
static final class EmptyLongConsumer implements LongConsumer {
@Override
public void accept(long v) { }
}
static final class TruePredicate implements Predicate {
@Override
public boolean test(Object o) {
return true;
}
}
static final class FalsePredicate implements Predicate {
@Override
public boolean test(Object o) {
return false;
}
}
static final class NullCallable implements Callable {
@Override
public Object call() {
return null;
}
}
static final class NaturalObjectComparator implements Comparator {
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public int compare(Object a, Object b) {
return ((Comparable)a).compareTo(b);
}
}
static final class MaxRequestSubscription implements Consumer {
@Override
public void accept(Subscription t) throws Exception {
t.request(Long.MAX_VALUE);
}
}
@SuppressWarnings("unchecked")
public static Consumer boundedConsumer(int bufferSize) {
return (Consumer) new BoundedConsumer(bufferSize);
}
public static class BoundedConsumer implements Consumer {
final int bufferSize;
BoundedConsumer(int bufferSize) {
this.bufferSize = bufferSize;
}
@Override
public void accept(Subscription s) throws Exception {
s.request(bufferSize);
}
}
}
