73 lines
2.0 KiB
Swift
73 lines
2.0 KiB
Swift
/*
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* Copyright 2022 The Yorkie Authors. All rights reserved.
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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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/**
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* `CRDTCounter` represents changeable number data type.
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*/
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class CRDTCounter<T: YorkieCountable>: CRDTElement {
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let createdAt: TimeTicket
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var movedAt: TimeTicket?
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var removedAt: TimeTicket?
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private(set) var value: T
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init(value: T, createdAt: TimeTicket) {
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self.createdAt = createdAt
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self.value = value
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}
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func toJSON() -> String {
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"\(self.value)"
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}
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func toSortedJSON() -> String {
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self.toJSON()
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}
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func deepcopy() -> CRDTElement {
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let counter = CRDTCounter(value: self.value, createdAt: self.createdAt)
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counter.movedAt = self.movedAt
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return counter
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}
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/**
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* `toBytes` creates an array representing the value.
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*/
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public func toBytes() -> Data {
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return withUnsafeBytes(of: self.value.littleEndian) { Data($0) }
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}
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/**
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* `increase` increases numeric data.
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*/
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@discardableResult
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public func increase(_ primitive: Primitive) throws -> CRDTCounter {
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switch primitive.value {
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case .integer(let int32Value):
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self.value &+= T(int32Value)
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case .long(let int64Value):
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self.value &+= T(int64Value)
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default:
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throw YorkieError.type(message: "Unsupported type of value: \(type(of: primitive.value))")
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}
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return self
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}
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}
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