mirror of
https://github.com/firebase/firebase-ios-sdk
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762057f711
Co-authored-by: Ehsan Nasiri <ehsann@google.com> Co-authored-by: dlarocque <daniellrq@outlook.com> Co-authored-by: Daniel La Rocque <dlarocque@google.com> Co-authored-by: cherylEnkidu <cheryllin@google.com> Co-authored-by: cherylEnkidu <96084918+cherylEnkidu@users.noreply.github.com> Co-authored-by: Daymon <daymxn@google.com>
67 lines
2.4 KiB
Swift
67 lines
2.4 KiB
Swift
/*
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* Copyright 2025 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 FirebaseFirestoreInternalWrapper
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#else
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@_exported import FirebaseFirestoreInternal
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#endif // SWIFT_PACKAGE
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/**
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* A protocol describing the encodable properties of a MaxKey.
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*
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* Note: this protocol exists as a workaround for the Swift compiler: if the MaxKey class
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* was extended directly to conform to Codable, the methods implementing the protocol would be need
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* to be marked required but that can't be done in an extension. Declaring the extension on the
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* protocol sidesteps this issue.
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*/
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private protocol CodableMaxKey: Codable {
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init()
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}
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/** The keys in a MaxKey. */
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private enum MaxKeyKeys: String, CodingKey {
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// We'll use a simple CodingKeys enum with a single case
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// to represent the presence of the singleton.
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case isFirestoreMaxKey
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}
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/**
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* An extension of MaxKey that implements the behavior of the Codable protocol.
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*
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* Note: this is implemented manually here because the Swift compiler can't synthesize these methods
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* when declaring an extension to conform to Codable.
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*/
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extension CodableMaxKey {
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public init(from decoder: Decoder) throws {
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// The presence of the `isFirestoreMaxKey` is enough to know that we
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// should return the singleton.
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let container = try decoder.container(keyedBy: MaxKeyKeys.self)
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_ = try container.decodeIfPresent(Bool.self, forKey: .isFirestoreMaxKey)
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self.init()
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}
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public func encode(to encoder: Encoder) throws {
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var container = encoder.container(keyedBy: MaxKeyKeys.self)
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// Encode a value of `true` to indicate the presence of MaxKey
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try container.encode(true, forKey: .isFirestoreMaxKey)
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}
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}
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/** Extends MaxKey to conform to Codable. */
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extension FirebaseFirestore.MaxKey: FirebaseFirestore.CodableMaxKey {}
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extension FirebaseFirestore.MaxKey: @retroactive Codable {}
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