46 lines
1.5 KiB
Swift
46 lines
1.5 KiB
Swift
import UIKit
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/// Keeps pagination cache key generation and cache IO in one BuildPipeline role.
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struct RDEPUBPaginationCacheCoordinator {
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private let cache: RDEPUBTextBookCache?
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private let layoutConfig: RDEPUBTextLayoutConfig
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init(cache: RDEPUBTextBookCache?, layoutConfig: RDEPUBTextLayoutConfig) {
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self.cache = cache
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self.layoutConfig = layoutConfig
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}
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func cacheKey(
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bookID: String,
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pageSize: CGSize,
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style: RDEPUBTextRenderStyle
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) -> String? {
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guard let cache else { return nil }
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return cache.cacheKey(
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bookID: bookID,
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fontSize: style.font.pointSize,
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lineHeightMultiple: style.lineSpacing,
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contentInsets: layoutConfig.edgeInsets,
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pageSize: pageSize,
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layoutConfigSignature: layoutConfig.cacheSignature
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)
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}
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func load(key: String?) -> [String: RDEPUBTextChapterPaginationCache]? {
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key.flatMap { cache?.load(key: $0) }
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}
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func save(chapters: [RDEPUBTextChapter], key: String?) {
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guard let key else { return }
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let paginationCache = chapters.map { chapter in
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RDEPUBTextChapterPaginationCache(
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href: chapter.href,
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pageRanges: chapter.pages.map(\.contentRange),
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breakReasons: chapter.pages.map(\.metadata.breakReason),
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semanticHints: Array(Set(chapter.pages.flatMap(\.metadata.semanticHints)))
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)
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}
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cache?.save(paginationCache, key: key)
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}
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}
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