70 lines
2.2 KiB
Swift
70 lines
2.2 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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* `AddOperation` is an operation representing adding an element to an Array.
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*/
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struct AddOperation: Operation {
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let parentCreatedAt: TimeTicket
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var executedAt: TimeTicket
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let previousCreatedAt: TimeTicket
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let value: CRDTElement
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init(parentCreatedAt: TimeTicket, previousCreatedAt: TimeTicket, value: CRDTElement, executedAt: TimeTicket) {
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self.parentCreatedAt = parentCreatedAt
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self.executedAt = executedAt
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self.previousCreatedAt = previousCreatedAt
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self.value = value
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}
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/**
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* `execute` executes this operation on the given document(`root`).
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*/
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func execute(root: CRDTRoot) throws {
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let parent = root.find(createdAt: self.parentCreatedAt)
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guard let array = parent as? CRDTArray else {
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let log: String
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if parent == nil {
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log = "fail to find \(self.parentCreatedAt)"
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} else {
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log = "fail to execute, only array can execute add"
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}
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Logger.critical(log)
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throw YorkieError.unexpected(message: log)
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}
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let value = self.value.deepcopy()
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try array.insert(value: value, afterCreatedAt: self.previousCreatedAt)
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root.registerElement(value, parent: array)
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}
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/**
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* `effectedCreatedAt` returns the creation time of the effected element.
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*/
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var effectedCreatedAt: TimeTicket {
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return self.value.createdAt
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}
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/**
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* `structureAsString` returns a string containing the meta data.
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*/
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var structureAsString: String {
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return "\(self.parentCreatedAt.structureAsString).ADD"
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}
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}
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