NetNewsWire/Frameworks/Data/Folder.swift

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//
// Folder.swift
// DataModel
//
// Created by Brent Simmons on 7/1/17.
// Copyright © 2017 Ranchero Software, LLC. All rights reserved.
//
import Foundation
public final class Folder: UnreadCountProvider {
public let account: Account
public var nameForDisplay: String
var childObjects = [AnyObject]()
init(account: Account, nameForDisplay: String) {
self.account = account
self.nameForDisplay = nameForDisplay
NotificationCenter.default.addObserver(self, selector: #selector(unreadCountDidChange(_:)), name: .UnreadCountDidChange, object: nil)
}
// MARK: Notifications
dynamic public func unreadCountDidChange(_ note: Notification) {
guard let obj = note.object else {
return
}
let potentialChild = obj as AnyObject
if isChild(potentialChild) {
updateUnreadCount()
}
}
// MARK: UnreadCountProvider
public var unreadCount = 0 {
didSet {
if unreadCount != oldValue {
postUnreadCountDidChangeNotification()
}
}
}
public func updateUnreadCount() {
unreadCount = calculateUnreadCount(childObjects)
}
}
extension Folder: Container {
public func flattenedFeeds() -> Set<Feed> {
var feeds = Set<Feed>()
for oneChild in childObjects {
if let oneFeed = oneChild as? Feed {
feeds.insert(oneFeed)
}
else if let oneContainer = oneChild as? Container {
feeds.formUnion(oneContainer.flattenedFeeds())
}
}
return feeds
}
public func isChild(_ obj: AnyObject) -> Bool {
return childObjects.contains(where: { (oneObject) -> Bool in
return oneObject === obj
})
}
public func visitObjects(_ recurse: Bool, _ visitBlock: VisitBlock) -> Bool {
for oneObject in childObjects {
if let oneContainer = oneObject as? Container {
if visitBlock(oneObject) {
return true
}
if recurse && oneContainer.visitObjects(recurse, visitBlock) {
return true
}
}
else {
if visitBlock(oneObject) {
return true
}
}
}
return false
}
}