NetNewsWire/Frameworks/Account/ArticleFetcher.swift

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//
// 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 WebFeed: ArticleFetcher {
public func fetchArticles() -> Set<Article> {
return account?.fetchArticles(.webFeed(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(.webFeed(self), callback)
}
public func fetchUnreadArticles() -> Set<Article> {
return fetchArticles().unreadArticles()
}
public func fetchUnreadArticlesAsync(_ callback: @escaping ArticleSetBlock) {
guard let account = account else {
assertionFailure("Expected feed.account, but got nil.")
callback(Set<Article>())
return
}
account.fetchArticlesAsync(.webFeed(self)) { callback($0.unreadArticles()) }
}
}
extension Folder: ArticleFetcher {
public func fetchArticles() -> Set<Article> {
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guard let account = account else {
assertionFailure("Expected folder.account, but got nil.")
return Set<Article>()
}
return account.fetchArticles(.folder(self, false))
}
public func fetchArticlesAsync(_ callback: @escaping ArticleSetBlock) {
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guard let account = account else {
assertionFailure("Expected folder.account, but got nil.")
callback(Set<Article>())
return
}
account.fetchArticlesAsync(.folder(self, false), callback)
}
public func fetchUnreadArticles() -> Set<Article> {
guard let account = account else {
assertionFailure("Expected folder.account, but got nil.")
return Set<Article>()
}
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return account.fetchArticles(.folder(self, true))
}
public func fetchUnreadArticlesAsync(_ callback: @escaping ArticleSetBlock) {
guard let account = account else {
assertionFailure("Expected folder.account, but got nil.")
callback(Set<Article>())
return
}
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account.fetchArticlesAsync(.folder(self, true), callback)
}
}