hu.akarnokd.rxjava3.expr

Class StatementFlowable

java.lang.Object

hu.akarnokd.rxjava3.expr.StatementFlowable

public final class StatementFlowable
extends Object

Imperative statements expressed as Flowable operators.

Method Summary

Modifier and Type	Method and Description
static <T> Flowable<T>	doWhile(Publisher<? extends T> source, BooleanSupplier postCondition) Return an Flowable that re-emits the emissions from the source Flowable, and then re-subscribes to the source long as a condition is true.
static <R> Flowable<R>	ifThen(BooleanSupplier condition, Publisher<? extends R> then) Return an Flowable that emits the emissions from a specified Flowable if a condition evaluates to true, otherwise return an empty Flowable.
static <R> Flowable<R>	ifThen(BooleanSupplier condition, Publisher<? extends R> then, Flowable<? extends R> orElse) Return an Flowable that emits the emissions from one specified Flowable if a condition evaluates to true, or from another specified Flowable otherwise.
static <R> Flowable<R>	ifThen(BooleanSupplier condition, Publisher<? extends R> then, Scheduler scheduler) Return an Flowable that emits the emissions from a specified Flowable if a condition evaluates to true, otherwise return an empty Flowable that runs on a specified Scheduler.
static <K,R> Flowable<R>	switchCase(Supplier<? extends K> caseSelector, Map<? super K,? extends Publisher<? extends R>> mapOfCases) Return a particular one of several possible Observables based on a case selector.
static <K,R> Flowable<R>	switchCase(Supplier<? extends K> caseSelector, Map<? super K,? extends Publisher<? extends R>> mapOfCases, Publisher<? extends R> defaultCase) Return a particular one of several possible Observables based on a case selector, or a default Flowable if the case selector does not map to a particular one.
static <K,R> Flowable<R>	switchCase(Supplier<? extends K> caseSelector, Map<? super K,? extends Publisher<? extends R>> mapOfCases, Scheduler scheduler) Return a particular one of several possible Observables based on a case selector and run it on the designated scheduler.
static <T> Flowable<T>	whileDo(Publisher<? extends T> source, BooleanSupplier preCondition) Return an Flowable that re-emits the emissions from the source Flowable as long as the condition is true before the first or subsequent subscribe() calls.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

switchCase

public static <K,R> Flowable<R> switchCase(Supplier<? extends K> caseSelector,
                                           Map<? super K,? extends Publisher<? extends R>> mapOfCases)

Return a particular one of several possible Observables based on a case selector.

Type Parameters:

K - the case key type

R - the result value type

Parameters:

caseSelector - the function that produces a case key when an Observer subscribes

mapOfCases - a map that maps a case key to an Flowable

Returns:

a particular Flowable chosen by key from the map of Observables, or an empty Flowable if no Flowable matches the key

switchCase

public static <K,R> Flowable<R> switchCase(Supplier<? extends K> caseSelector,
                                           Map<? super K,? extends Publisher<? extends R>> mapOfCases,
                                           Scheduler scheduler)

Return a particular one of several possible Observables based on a case selector and run it on the designated scheduler.

Type Parameters:

K - the case key type

R - the result value type

Parameters:

caseSelector - the function that produces a case key when an Observer subscribes

mapOfCases - a map that maps a case key to an Flowable

scheduler - the scheduler where the empty observable is observed

Returns:

a particular Flowable chosen by key from the map of Observables, or an empty Flowable if no Flowable matches the key, but one that runs on the designated scheduler in either case

switchCase

public static <K,R> Flowable<R> switchCase(Supplier<? extends K> caseSelector,
                                           Map<? super K,? extends Publisher<? extends R>> mapOfCases,
                                           Publisher<? extends R> defaultCase)

Return a particular one of several possible Observables based on a case selector, or a default Flowable if the case selector does not map to a particular one.

Type Parameters:

K - the case key type

R - the result value type

Parameters:

caseSelector - the function that produces a case key when an Observer subscribes

mapOfCases - a map that maps a case key to an Flowable

defaultCase - the default Flowable if the mapOfCases doesn't contain a value for the key returned by the caseSelector

Returns:

a particular Flowable chosen by key from the map of Observables, or the default case if no Flowable matches the key

doWhile

public static <T> Flowable<T> doWhile(Publisher<? extends T> source,
                                      BooleanSupplier postCondition)

Return an Flowable that re-emits the emissions from the source Flowable, and then re-subscribes to the source long as a condition is true.

Type Parameters:

T - the value type

Parameters:

source - the source Flowable to work with

postCondition - the post condition to test after the source Flowable completes

Returns:

an Flowable that replays the emissions from the source Flowable, and then continues to replay them so long as the post condition is true

whileDo

public static <T> Flowable<T> whileDo(Publisher<? extends T> source,
                                      BooleanSupplier preCondition)

Return an Flowable that re-emits the emissions from the source Flowable as long as the condition is true before the first or subsequent subscribe() calls.

Type Parameters:

T - the value type

Parameters:

source - the source Flowable to work with

preCondition - the condition to evaluate before subscribing to or replaying the source Flowable

Returns:

an Flowable that replays the emissions from the source Flowable so long as preCondition is true

ifThen

public static <R> Flowable<R> ifThen(BooleanSupplier condition,
                                     Publisher<? extends R> then)

Return an Flowable that emits the emissions from a specified Flowable if a condition evaluates to true, otherwise return an empty Flowable.

Type Parameters:

R - the result value type

Parameters:

condition - the condition that decides whether to emit the emissions from the then Flowable

then - the Flowable sequence to emit to if condition is true

Returns:

an Flowable that mimics the then Flowable if the condition function evaluates to true, or an empty Flowable otherwise

ifThen

public static <R> Flowable<R> ifThen(BooleanSupplier condition,
                                     Publisher<? extends R> then,
                                     Scheduler scheduler)

Return an Flowable that emits the emissions from a specified Flowable if a condition evaluates to true, otherwise return an empty Flowable that runs on a specified Scheduler.

Type Parameters:

R - the result value type

Parameters:

condition - the condition that decides whether to emit the emissions from the then Flowable

then - the Flowable sequence to emit to if condition is true

scheduler - the Scheduler on which the empty Flowable runs if the in case the condition returns false

Returns:

an Flowable that mimics the then Flowable if the condition function evaluates to true, or an empty Flowable running on the specified Scheduler otherwise

ifThen

public static <R> Flowable<R> ifThen(BooleanSupplier condition,
                                     Publisher<? extends R> then,
                                     Flowable<? extends R> orElse)

Return an Flowable that emits the emissions from one specified Flowable if a condition evaluates to true, or from another specified Flowable otherwise.

Type Parameters:

R - the result value type

Parameters:

condition - the condition that decides which Flowable to emit the emissions from

then - the Flowable sequence to emit to if condition is true

orElse - the Flowable sequence to emit to if condition is false

Returns:

an Flowable that mimics either the then or orElse Observables depending on a condition function