NetNewsWire/Frameworks/Account/ArticleFetcher.swift

71 lines
1.8 KiB
Swift

//
// ArticleFetcher.swift
// NetNewsWire
//
// Created by Brent Simmons on 2/4/18.
// Copyright © 2018 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import Articles
public protocol ArticleFetcher {
func fetchArticles() -> Set<Article>
func fetchArticlesAsync(_ callback: @escaping ArticleSetBlock)
func fetchUnreadArticles() -> Set<Article>
func fetchUnreadArticlesAsync(_ callback: @escaping ArticleSetBlock)
}
extension Feed: ArticleFetcher {
public func fetchArticles() -> Set<Article> {
return account?.fetchArticles(.feed(self)) ?? Set<Article>()
}
public func fetchArticlesAsync(_ callback: @escaping ArticleSetBlock) {
guard let account = account else {
assertionFailure("Expected feed.account, but got nil.")
callback(Set<Article>())
return
}
account.fetchArticlesAsync(.feed(self), callback)
}
public func fetchUnreadArticles() -> Set<Article> {
preconditionFailure("feed.fetchUnreadArticles is unused.")
}
public func fetchUnreadArticlesAsync(_ callback: @escaping ArticleSetBlock) {
preconditionFailure("feed.fetchUnreadArticlesAsync is unused.")
}
}
extension Folder: ArticleFetcher {
public func fetchArticles() -> Set<Article> {
return fetchUnreadArticles()
}
public func fetchArticlesAsync(_ callback: @escaping ArticleSetBlock) {
fetchUnreadArticlesAsync(callback)
}
public func fetchUnreadArticles() -> Set<Article> {
guard let account = account else {
assertionFailure("Expected folder.account, but got nil.")
return Set<Article>()
}
return account.fetchArticles(.unreadForFolder(self))
}
public func fetchUnreadArticlesAsync(_ callback: @escaping ArticleSetBlock) {
guard let account = account else {
assertionFailure("Expected folder.account, but got nil.")
callback(Set<Article>())
return
}
account.fetchArticlesAsync(.unreadForFolder(self), callback)
}
}