//
//  materialized+elements.swift
//  RxSwiftExt
//
//  Created by Andy Chou on 1/5/17.
//  Copyright © 2017 RxSwift Community. All rights reserved.
//

import Foundation
import RxSwift

extension ObservableType where E: EventConvertible {

	/**
	 Returns an observable sequence containing only next elements from its input
	 - seealso: [materialize operator on reactivex.io](http://reactivex.io/documentation/operators/materialize-dematerialize.html)
	 */
	public func elements() -> Observable<E.ElementType> {
		return filter { $0.event.element != nil }
				.map { $0.event.element! }
	}

	/**
	 Returns an observable sequence containing only error elements from its input
	 - seealso: [materialize operator on reactivex.io](http://reactivex.io/documentation/operators/materialize-dematerialize.html)
	 */
	public func errors() -> Observable<Swift.Error> {
		return filter { $0.event.error != nil }
				.map { $0.event.error! }
	}
}