mirror of
https://github.com/firebase/firebase-ios-sdk
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41 lines
1.4 KiB
Swift
41 lines
1.4 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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import Foundation
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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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import FirebaseSharedSwift
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public extension DataSnapshot {
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/// Retrieves the value of a snapshot and converts it to an instance of
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/// caller-specified type.
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/// Throws `DecodingError.valueNotFound`
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/// if the document does not exist and `T` is not an `Optional`.
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///
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/// See `Database.Decoder` for more details about the decoding process.
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///
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/// - Parameters
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/// - type: The type to convert the document fields to.
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/// - decoder: The decoder to use to convert the document. Defaults to use
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/// default decoder.
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func data<T: Decodable>(as type: T.Type,
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decoder: Database.Decoder =
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Database.Decoder()) throws -> T {
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try decoder.decode(T.self, from: value ?? NSNull())
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}
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}
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