NetNewsWire/Frameworks/Account/UnreadCountProvider.swift

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//
// UnreadCountProtocol.swift
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// NetNewsWire
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//
// Created by Brent Simmons on 4/8/16.
// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
//
import Foundation
public extension Notification.Name {
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static let UnreadCountDidChange = Notification.Name(rawValue: "UnreadCountDidChange")
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}
public protocol UnreadCountProvider {
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var unreadCount: Int { get }
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func postUnreadCountDidChangeNotification()
func calculateUnreadCount<T: Collection>(_ children: T) -> Int
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}
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public extension UnreadCountProvider {
func postUnreadCountDidChangeNotification() {
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NotificationCenter.default.post(name: .UnreadCountDidChange, object: self, userInfo: nil)
}
func calculateUnreadCount<T: Collection>(_ children: T) -> Int {
let updatedUnreadCount = children.reduce(0) { (result, oneChild) -> Int in
if let oneUnreadCountProvider = oneChild as? UnreadCountProvider {
return result + oneUnreadCountProvider.unreadCount
}
return result
}
return updatedUnreadCount
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}
}