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polymorphism.md

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title Polymorphism and Dynamic Types
sidebar_position 7
id polymorphism
license Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Fory Swift supports dynamic serialization for Any, AnyObject, and any Serializer.

Top-level Dynamic APIs

let fory = Fory()

let dynamic: Any = Int32(7)
let data = try fory.serialize(dynamic)
let decoded: Any = try fory.deserialize(data)

Equivalent overloads exist for:

  • AnyObject
  • any Serializer
  • AnyHashable
  • [Any]
  • [String: Any]
  • [Int32: Any]
  • [AnyHashable: Any]

Dynamic Fields in Fory Model Types

@ForyStruct
struct DynamicHolder {
    var value: Any = ForyAnyNullValue()
    var list: [Any] = []
    var byName: [String: Any] = [:]
    var byId: [Int32: Any] = [:]
    var byDynamicKey: [AnyHashable: Any] = [:]
}

Concrete Type Registration Still Applies

If dynamic values contain user-defined runtime types, register those concrete types.

@ForyStruct
struct Address {
    var street: String = ""
    var zip: Int32 = 0
}

let fory = Fory()
fory.register(Address.self, id: 100)

Null Semantics

  • Any null representation: ForyAnyNullValue
  • AnyObject null representation: NSNull
  • Optional dynamic values map to the corresponding null representation on decode

Current Limitations

  • AnyHashable keys must wrap runtime values that are both Hashable and supported by Fory dynamic serialization