rx.internal.operators

Class OperatorScan<R,T>

java.lang.Object

rx.internal.operators.OperatorScan<R,T>

All Implemented Interfaces:

Func1<Subscriber<? super R>,Subscriber<? super T>>, Function, Observable.Operator<R,T>

public final class OperatorScan<R,T>
extends java.lang.Object
implements Observable.Operator<R,T>

Returns an Observable that applies a function to the first item emitted by a source Observable, then feeds the result of that function along with the second item emitted by an Observable into the same function, and so on until all items have been emitted by the source Observable, emitting the result of each of these iterations.

This sort of function is sometimes called an accumulator.

Note that when you pass a seed to scan the resulting Observable will emit that seed as its first emitted item.

Constructor Summary

Constructors

Constructor and Description
OperatorScan(Func2<R,? super T,R> accumulator) Applies an accumulator function over an observable sequence and returns each intermediate result with the specified source and accumulator.
OperatorScan(R initialValue, Func2<R,? super T,R> accumulator) Applies an accumulator function over an observable sequence and returns each intermediate result with the specified source and accumulator.

Method Summary

Methods

Modifier and Type	Method and Description
Subscriber<? super T>	call(Subscriber<? super R> child)

Methods inherited from class java.lang.Object

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

Constructor Detail

OperatorScan

public OperatorScan(R initialValue,
            Func2<R,? super T,R> accumulator)

Applies an accumulator function over an observable sequence and returns each intermediate result with the specified source and accumulator.

Parameters:

initialValue - the initial (seed) accumulator value

accumulator - an accumulator function to be invoked on each element from the sequence

See Also:

Observable.Scan(TSource, TAccumulate) Method (IObservable(TSource), TAccumulate, Func(TAccumulate, TSource, TAccumulate))

OperatorScan

public OperatorScan(Func2<R,? super T,R> accumulator)

Applies an accumulator function over an observable sequence and returns each intermediate result with the specified source and accumulator.

Parameters:

accumulator - an accumulator function to be invoked on each element from the sequence

See Also:

Observable.Scan(TSource) Method (IObservable(TSource), Func(TSource, TSource, TSource))

Method Detail

call

public Subscriber<? super T> call(Subscriber<? super R> child)

Specified by:

call in interface Func1<Subscriber<? super R>,Subscriber<? super T>>