rx.observers

Class Observers

java.lang.Object

rx.observers.Observers

public class Observers
extends java.lang.Object

Helper methods and utilities for creating and working with Observer objects.

Constructor Summary

Constructors

Constructor and Description
Observers()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Observer<T>	create(Action1<? super T> onNext) Creates an Observer that receives the emissions of any Observable it subscribes to via onNext but ignores onError and onCompleted notifications.
static <T> Observer<T>	create(Action1<? super T> onNext, Action1<java.lang.Throwable> onError) Creates an Observer that receives the emissions of any Observable it subscribes to via onNext and handles any onError notification but ignores an onCompleted notification.
static <T> Observer<T>	create(Action1<? super T> onNext, Action1<java.lang.Throwable> onError, Action0 onComplete) Creates an Observer that receives the emissions of any Observable it subscribes to via onNext and handles any onError or onCompleted notifications.
static <T> Observer<T>	empty() Returns an inert Observer that does nothing in response to the emissions or notifications from any Observable it subscribes to.

Methods inherited from class java.lang.Object

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

Constructor Detail

Observers

public Observers()

Method Detail

empty

public static <T> Observer<T> empty()

Returns an inert Observer that does nothing in response to the emissions or notifications from any Observable it subscribes to. This is different, however, from an EmptyObserver, in that it will throw an exception if its onError method is called (whereas EmptyObserver will swallow the error in such a case).

Returns:

an inert Observer

create

public static final <T> Observer<T> create(Action1<? super T> onNext)

Creates an Observer that receives the emissions of any Observable it subscribes to via onNext but ignores onError and onCompleted notifications.

Parameters:

onNext - a function that handles each item emitted by an Observable

Returns:

an Observer that calls onNext for each emitted item from the Observable the Observer subscribes to

Throws:

IllegalArgument - Exception if onNext is null

create

public static final <T> Observer<T> create(Action1<? super T> onNext,
                     Action1<java.lang.Throwable> onError)

Creates an Observer that receives the emissions of any Observable it subscribes to via onNext and handles any onError notification but ignores an onCompleted notification.

Parameters:

onNext - a function that handles each item emitted by an Observable

onError - a function that handles an error notification if one is sent by an Observable

Returns:

an Observer that calls onNext for each emitted item from the Observable the Observer subscribes to, and calls onError if the Observable notifies of an error

Throws:

IllegalArgument - Exception if either onNext or onError are null

create

public static final <T> Observer<T> create(Action1<? super T> onNext,
                     Action1<java.lang.Throwable> onError,
                     Action0 onComplete)

Creates an Observer that receives the emissions of any Observable it subscribes to via onNext and handles any onError or onCompleted notifications.

Parameters:

onNext - a function that handles each item emitted by an Observable

onError - a function that handles an error notification if one is sent by an Observable

onComplete - a function that handles a sequence complete notification if one is sent by an Observable

Returns:

an Observer that calls onNext for each emitted item from the Observable the Observer subscribes to, calls onError if the Observable notifies of an error, and calls onComplete if the Observable notifies that the observable sequence is complete

Throws:

IllegalArgument - Exception if either onNext, onError, or onComplete are null