98 lines
3.0 KiB
Swift
98 lines
3.0 KiB
Swift
//
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// Copyright (c) 2018 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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/// Enum that contains states for general data loading.
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///
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/// - initial: Initial state. Before something will happen.
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/// - loading: Loading state. When data loading is started.
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/// - result: Result state from a specific data source with result.
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/// - error: Error state with a specific error.
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/// - empty: Empty state. When data was requested and empty result was received.
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public enum GeneralDataLoadingState<DS: DataSource> {
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case initial
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case loading
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case result(newResult: DS.ResultType, from: DS)
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case error(error: Error)
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case empty
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}
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extension GeneralDataLoadingState: DataLoadingState {
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public typealias DataSourceType = DS
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public static var initialState: GeneralDataLoadingState<DS> {
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return .initial
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}
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public static var emptyState: GeneralDataLoadingState<DS> {
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return .empty
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}
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public static func initialLoadingState(after: GeneralDataLoadingState<DS>) -> GeneralDataLoadingState<DS> {
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return .loading
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}
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public static func resultState(result: DS.ResultType,
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from: DS,
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after: GeneralDataLoadingState<DS>) -> GeneralDataLoadingState<DS> {
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return .result(newResult: result, from: from)
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}
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public static func errorState(error: Error,
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after: GeneralDataLoadingState<DS>) -> GeneralDataLoadingState<DS> {
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return .error(error: error)
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}
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public var isInitialState: Bool {
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switch self {
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case .initial:
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return true
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default:
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return false
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}
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}
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public var result: DS.ResultType? {
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switch self {
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case .result(let newResult, _):
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return newResult
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default:
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return nil
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}
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}
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public var error: Error? {
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switch self {
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case .error(let error):
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return error
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default:
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return nil
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}
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}
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}
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