133 lines
2.8 KiB
Swift
133 lines
2.8 KiB
Swift
//
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// Container.swift
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// Evergreen
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//
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// Created by Brent Simmons on 4/17/16.
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// Copyright © 2016 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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import RSCore
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import Data
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public typealias VisitBlock = (_ obj: AnyObject) -> Bool // Return true to stop
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extension NSNotification.Name {
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public static let ChildrenDidChange = Notification.Name("ChildrenDidChangeNotification")
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}
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public protocol Container {
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//Recursive
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func hasAtLeastOneFeed() -> Bool
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func flattenedFeeds() -> Set<Feed>
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func existingFeed(with feedID: String) -> Feed?
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func existingFeed(withURL url: String) -> Feed?
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func hasFeed(withURL url: String) -> Bool
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func isChild(_ obj: AnyObject) -> Bool
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// visitBlock should return true to stop visiting.
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// visitObjects returns true if a visitBlock returned true.
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func visitObjects(_ recurse: Bool, _ visitBlock: VisitBlock) -> Bool
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}
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public extension Container {
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func hasAtLeastOneFeed() -> Bool {
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let foundObject = findObject(true, visitBlock: { (oneDescendant) -> Bool in
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return oneDescendant is Feed
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})
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return foundObject != nil
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}
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func existingFeed(with feedID: String) -> Feed? {
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let foundObject = findObject(true) { (oneDescendant) -> Bool in
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if let oneFeed = oneDescendant as? Feed, oneFeed.feedID == feedID {
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return true
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}
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return false
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}
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return foundObject as! Feed?
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}
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func existingFeed(withURL url: String) -> Feed? {
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let foundObject = findObject(true) { (oneDescendant) -> Bool in
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if let oneFeed = oneDescendant as? Feed, oneFeed.url == url {
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return true
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}
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return false
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}
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return foundObject as! Feed?
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}
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func hasFeed(withURL url: String) -> Bool {
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if let _ = existingFeed(withURL: url) {
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return true
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}
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return false
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}
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func visitChildren(visitBlock: VisitBlock) -> Bool {
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return visitObjects(false, visitBlock)
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}
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func findObject(_ recurse: Bool, visitBlock: @escaping VisitBlock) -> AnyObject? {
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var foundObject: AnyObject?
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let _ = visitObjects(recurse) { (oneObject) in
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if let _ = foundObject {
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return true
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}
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if visitBlock(oneObject) {
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foundObject = oneObject
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return true
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}
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return false
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}
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return foundObject
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}
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func objectIsChild(_ obj: AnyObject) -> Bool {
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return visitObjects(false) { (oneObject) in
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return obj === oneObject
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}
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}
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func objectIsDescendant(_ obj: AnyObject) -> Bool {
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return visitObjects(true) { (oneObject) in
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return obj === oneObject
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}
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}
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func existingFolderWithName(_ name: String) -> Folder? {
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let foundObject = findObject(false) { (oneObject) in
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if let oneFolder = oneObject as? Folder, oneFolder.nameForDisplay == name {
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return true
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}
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return false
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}
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return foundObject as! Folder?
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}
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public func postChildrenDidChangeNotification() {
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NotificationCenter.default.post(name: .ChildrenDidChange, object: self)
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}
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}
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