130 lines
3.5 KiB
Swift
130 lines
3.5 KiB
Swift
//
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// IconImageCache.swift
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// NetNewsWire-iOS
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//
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// Created by Brent Simmons on 5/2/21.
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// Copyright © 2021 Ranchero Software. All rights reserved.
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//
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import Foundation
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import Account
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import Articles
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class IconImageCache {
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static var shared = IconImageCache()
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private var smartFeedIconImageCache = [SidebarItemIdentifier: IconImage]()
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private var feedIconImageCache = [SidebarItemIdentifier: IconImage]()
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private var faviconImageCache = [SidebarItemIdentifier: IconImage]()
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private var smallIconImageCache = [SidebarItemIdentifier: IconImage]()
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private var authorIconImageCache = [Author: IconImage]()
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func imageFor(_ feedID: SidebarItemIdentifier) -> IconImage? {
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if let smartFeed = SmartFeedsController.shared.find(by: feedID) {
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return imageForFeed(smartFeed)
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}
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if let feed = AccountManager.shared.existingFeed(with: feedID) {
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return imageForFeed(feed)
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}
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return nil
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}
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func imageForFeed(_ feed: SidebarItem) -> IconImage? {
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guard let feedID = feed.sidebarItemID else {
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return nil
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}
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if let smartFeed = feed as? PseudoFeed {
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return imageForSmartFeed(smartFeed, feedID)
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}
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if let feed = feed as? Feed, let iconImage = imageForFeed(feed, feedID) {
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return iconImage
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}
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if let smallIconProvider = feed as? SmallIconProvider {
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return imageForSmallIconProvider(smallIconProvider, feedID)
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}
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return nil
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}
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func imageForArticle(_ article: Article) -> IconImage? {
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if let iconImage = imageForAuthors(article.authors) {
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return iconImage
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}
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guard let feed = article.feed else {
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return nil
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}
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return imageForFeed(feed)
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}
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func emptyCache() {
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smartFeedIconImageCache = [SidebarItemIdentifier: IconImage]()
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feedIconImageCache = [SidebarItemIdentifier: IconImage]()
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faviconImageCache = [SidebarItemIdentifier: IconImage]()
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smallIconImageCache = [SidebarItemIdentifier: IconImage]()
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authorIconImageCache = [Author: IconImage]()
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}
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}
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private extension IconImageCache {
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func imageForSmartFeed(_ smartFeed: PseudoFeed, _ feedID: SidebarItemIdentifier) -> IconImage? {
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if let iconImage = smartFeedIconImageCache[feedID] {
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return iconImage
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}
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if let iconImage = smartFeed.smallIcon {
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smartFeedIconImageCache[feedID] = iconImage
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return iconImage
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}
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return nil
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}
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func imageForFeed(_ feed: Feed, _ feedID: SidebarItemIdentifier) -> IconImage? {
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if let iconImage = feedIconImageCache[feedID] {
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return iconImage
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}
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if let iconImage = appDelegate.feedIconDownloader.icon(for: feed) {
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feedIconImageCache[feedID] = iconImage
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return iconImage
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}
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if let faviconImage = faviconImageCache[feedID] {
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return faviconImage
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}
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if let faviconImage = appDelegate.faviconDownloader.faviconAsIcon(for: feed) {
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faviconImageCache[feedID] = faviconImage
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return faviconImage
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}
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return nil
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}
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func imageForSmallIconProvider(_ provider: SmallIconProvider, _ feedID: SidebarItemIdentifier) -> IconImage? {
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if let iconImage = smallIconImageCache[feedID] {
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return iconImage
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}
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if let iconImage = provider.smallIcon {
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smallIconImageCache[feedID] = iconImage
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return iconImage
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}
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return nil
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}
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func imageForAuthors(_ authors: Set<Author>?) -> IconImage? {
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guard let authors = authors, authors.count == 1, let author = authors.first else {
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return nil
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}
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return imageForAuthor(author)
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}
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func imageForAuthor(_ author: Author) -> IconImage? {
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if let iconImage = authorIconImageCache[author] {
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return iconImage
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}
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if let iconImage = appDelegate.authorAvatarDownloader.image(for: author) {
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authorIconImageCache[author] = iconImage
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return iconImage
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}
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return nil
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}
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}
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