//
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// ToArray.swift
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// RxSwift
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//
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// Created by Junior B. on 20/10/15.
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// Copyright © 2015 Krunoslav Zaher. All rights reserved.
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//
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extension ObservableType {
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/**
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Converts an Observable into a Single that emits the whole sequence as a single array and then terminates.
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For aggregation behavior see `reduce`.
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- seealso: [toArray operator on reactivex.io](http://reactivex.io/documentation/operators/to.html)
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- returns: A Single sequence containing all the emitted elements as array.
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*/
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public func toArray()
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-> Single<[Element]> {
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PrimitiveSequence(raw: ToArray(source: self.asObservable()))
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}
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}
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final private class ToArraySink<SourceType, Observer: ObserverType>: Sink<Observer>, ObserverType where Observer.Element == [SourceType] {
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typealias Parent = ToArray<SourceType>
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let parent: Parent
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var list = [SourceType]()
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init(parent: Parent, observer: Observer, cancel: Cancelable) {
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self.parent = parent
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super.init(observer: observer, cancel: cancel)
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}
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func on(_ event: Event<SourceType>) {
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switch event {
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case .next(let value):
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self.list.append(value)
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case .error(let e):
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self.forwardOn(.error(e))
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self.dispose()
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case .completed:
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self.forwardOn(.next(self.list))
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self.forwardOn(.completed)
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self.dispose()
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}
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}
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}
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final private class ToArray<SourceType>: Producer<[SourceType]> {
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let source: Observable<SourceType>
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init(source: Observable<SourceType>) {
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self.source = source
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}
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override func run<Observer: ObserverType>(_ observer: Observer, cancel: Cancelable) -> (sink: Disposable, subscription: Disposable) where Observer.Element == [SourceType] {
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let sink = ToArraySink(parent: self, observer: observer, cancel: cancel)
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let subscription = self.source.subscribe(sink)
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return (sink: sink, subscription: subscription)
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}
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}
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