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