mirror of
https://github.com/firebase/firebase-ios-sdk
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71 lines
2.0 KiB
Swift
71 lines
2.0 KiB
Swift
/*
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* Copyright 2020 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#if SWIFT_PACKAGE
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@_exported import FirebaseDatabaseInternal
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#endif // SWIFT_PACKAGE
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/// A property wrapper that marks an `Optional<Date>` field to be
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/// populated with a server timestamp. If a `Codable` object being written
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/// contains a `nil` for an `@ServerTimestamp`-annotated field, it will be
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/// replaced with `ServerValue.timestamp()` as it is sent.
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///
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/// Example:
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/// ```
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/// struct CustomModel {
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/// @ServerTimestamp var ts: Date?
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/// }
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/// ```
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///
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/// Then writing `CustomModel(ts: nil)` will tell server to fill `ts` with
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/// current timestamp.
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@propertyWrapper
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public struct ServerTimestamp: Codable, Equatable, Hashable {
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var value: Date?
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public init(wrappedValue value: Date?) {
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self.value = value
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}
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public var wrappedValue: Date? {
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get { value }
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set { value = newValue }
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}
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// MARK: Codable
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public init(from decoder: Decoder) throws {
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let container = try decoder.singleValueContainer()
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if container.decodeNil() {
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value = nil
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} else {
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let msecs = try container.decode(Int.self)
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value = Date(timeIntervalSince1970: TimeInterval(msecs) / 1000)
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}
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}
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public func encode(to encoder: Encoder) throws {
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var container = encoder.singleValueContainer()
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if let value {
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let interval = value.timeIntervalSince1970
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try container.encode(Int(interval * 1000))
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} else {
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let dictionary = ServerValue.timestamp() as! [String: String]
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try container.encode(dictionary)
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}
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}
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}
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