75 lines
1.3 KiB
Swift
75 lines
1.3 KiB
Swift
//
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// BinaryDiskCache.swift
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// RSCore
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//
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// Created by Brent Simmons on 11/24/17.
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// Copyright © 2017 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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// Thread safety is up to the caller.
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public struct BinaryDiskCache {
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public let folder: String
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public init(folder: String) {
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self.folder = folder
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}
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public func data(forKey key: String) throws -> Data? {
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let url = urlForKey(key)
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return try Data(contentsOf: url)
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}
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public func setData(_ data: Data, forKey key: String) throws {
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let url = urlForKey(key)
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try data.write(to: url)
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}
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public func deleteData(forKey key: String) throws {
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let url = urlForKey(key)
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try FileManager.default.removeItem(at: url)
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}
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// subscript doesn’t throw, for cases when you can ignore errors.
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public subscript(_ key: String) -> Data? {
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get {
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do {
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return try data(forKey: key)
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}
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catch {}
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return nil
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}
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set {
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if let data = newValue {
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do {
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try setData(data, forKey: key)
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}
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catch {}
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}
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else {
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do {
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try deleteData(forKey: key)
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}
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catch{}
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}
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}
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}
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}
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private extension BinaryDiskCache {
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func filePath(forKey key: String) -> String {
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return (folder as NSString).appendingPathComponent(key)
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}
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func urlForKey(_ key: String) -> URL {
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let f = filePath(forKey: key)
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return URL(fileURLWithPath: f)
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}
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}
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