89 lines
3.9 KiB
Swift
89 lines
3.9 KiB
Swift
//
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// Copyright (c) 2023 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 TISwiftUtils
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public extension MigratingBackingStore where Store: CodableKeyValueStorage,
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StoreContent: Codable {
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init<Value: Codable>(key: StorageKey<Value>,
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storageContainer: Store,
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decoder: CodableKeyValueDecoder = JSONKeyValueDecoder(),
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encoder: CodableKeyValueEncoder = JSONKeyValueEncoder())
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where StoreContent == Value? {
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let getClosure: GetClosure = { container in
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Self.getValue(from: container, forKey: key, decoder: decoder, encoder: encoder)
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}
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let setClosure: SetClosure = { container, value in
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try? container.setOrRemove(codableObject: value, forKey: key, encoder: encoder).get()
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}
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self.init(store: storageContainer, getClosure: getClosure, setClosure: setClosure)
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}
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init<Value: Codable>(wrappedValue: Value,
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key: StorageKey<Value>,
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storageContainer: Store,
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decoder: CodableKeyValueDecoder = JSONKeyValueDecoder(),
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encoder: CodableKeyValueEncoder = JSONKeyValueEncoder())
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where StoreContent == Value? {
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let getClosure: GetClosure = { container in
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Self.getValue(from: container, forKey: key, wrappedValue: wrappedValue, decoder: decoder, encoder: encoder)
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}
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let setClosure: SetClosure = { container, value in
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try? container.setOrRemove(codableObject: value, forKey: key, encoder: encoder).get()
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}
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self.init(store: storageContainer, getClosure: getClosure, setClosure: setClosure)
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}
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static func getValue<Value: Codable>(from container: Store,
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forKey key: StorageKey<Value>,
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wrappedValue: Value? = nil,
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decoder: CodableKeyValueDecoder,
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encoder: CodableKeyValueEncoder) -> StoreContent where StoreContent == Value? {
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// Storage container can't handle migration when source storage has value and target doesn't.
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// This happens because of Decodable restrictions for Value in method `codableObject(forKey:decoder)`
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// and absence of encoder.
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try? container.codableObject(forKey: key, decoder: decoder)
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.flatMap {
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let _ = container.set(encodableObject: $0, forKey: key, encoder: encoder)
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return .success($0)
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}
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.flatMapError {
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guard let wrappedValue else {
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return .failure($0)
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}
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return container.set(encodableObject: wrappedValue, forKey: key, encoder: encoder)
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.flatMap { _ in .success(wrappedValue) }
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}
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.get()
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}
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}
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