NetNewsWire/Shared/IconImageCache.swift

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