72 lines
2.7 KiB
Swift
72 lines
2.7 KiB
Swift
//
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// Copyright (c) 2022 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import Foundation
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// Creating a date formatter is not a cheap operation.
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// If you are likely to use a formatter frequently,
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// it is typically more efficient to cache a single instance
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// than to create and dispose of multiple instances.
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// (https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html#//apple_ref/doc/uid/TP40002369-SW10)
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open class DateFormattersReusePool {
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private var pool: ThreadSafeDictionary<String, DateFormatter> = [:]
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private let presetLocale: Locale?
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private let presetTimeZone: TimeZone?
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public init(presetLocale: Locale? = nil, presetTimeZone: TimeZone? = nil) {
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self.presetLocale = presetLocale
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self.presetTimeZone = presetTimeZone
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}
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open func dateFormatter<Format: DateFormat>(for dateFormat: Format) -> DateFormatter {
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guard let cachedFormatter = pool[dateFormat.rawValue] else {
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return register(dateFormat: dateFormat)
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}
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return cachedFormatter
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}
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open func register<Format: DateFormat>(format: Format.Type) {
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for dateFormat in Format.allCases {
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register(dateFormat: dateFormat)
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}
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}
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@discardableResult
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open func register<Format: DateFormat>(dateFormat: Format) -> DateFormatter {
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let dateFormatter = DateFormatter(dateFormat: dateFormat)
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if let locale = presetLocale {
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dateFormatter.locale = locale
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}
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if let timeZone = presetTimeZone {
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dateFormatter.timeZone = timeZone
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}
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pool[dateFormat.rawValue] = dateFormatter
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return dateFormatter
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}
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}
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