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Books App - using google books APIs the list is populated with books

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h_mal
2018-07-14 05:53:58 -07:00
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//
// Response.swift
//
// Copyright (c) 2014-2018 Alamofire Software Foundation (http://alamofire.org/)
//
// 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.
//
import Foundation
/// Used to store all data associated with an non-serialized response of a data or upload request.
public struct DefaultDataResponse {
/// The URL request sent to the server.
public let request: URLRequest?
/// The server's response to the URL request.
public let response: HTTPURLResponse?
/// The data returned by the server.
public let data: Data?
/// The error encountered while executing or validating the request.
public let error: Error?
/// The timeline of the complete lifecycle of the request.
public let timeline: Timeline
var _metrics: AnyObject?
/// Creates a `DefaultDataResponse` instance from the specified parameters.
///
/// - Parameters:
/// - request: The URL request sent to the server.
/// - response: The server's response to the URL request.
/// - data: The data returned by the server.
/// - error: The error encountered while executing or validating the request.
/// - timeline: The timeline of the complete lifecycle of the request. `Timeline()` by default.
/// - metrics: The task metrics containing the request / response statistics. `nil` by default.
public init(
request: URLRequest?,
response: HTTPURLResponse?,
data: Data?,
error: Error?,
timeline: Timeline = Timeline(),
metrics: AnyObject? = nil)
{
self.request = request
self.response = response
self.data = data
self.error = error
self.timeline = timeline
}
}
// MARK: -
/// Used to store all data associated with a serialized response of a data or upload request.
public struct DataResponse<Value> {
/// The URL request sent to the server.
public let request: URLRequest?
/// The server's response to the URL request.
public let response: HTTPURLResponse?
/// The data returned by the server.
public let data: Data?
/// The result of response serialization.
public let result: Result<Value>
/// The timeline of the complete lifecycle of the request.
public let timeline: Timeline
/// Returns the associated value of the result if it is a success, `nil` otherwise.
public var value: Value? { return result.value }
/// Returns the associated error value if the result if it is a failure, `nil` otherwise.
public var error: Error? { return result.error }
var _metrics: AnyObject?
/// Creates a `DataResponse` instance with the specified parameters derived from response serialization.
///
/// - parameter request: The URL request sent to the server.
/// - parameter response: The server's response to the URL request.
/// - parameter data: The data returned by the server.
/// - parameter result: The result of response serialization.
/// - parameter timeline: The timeline of the complete lifecycle of the `Request`. Defaults to `Timeline()`.
///
/// - returns: The new `DataResponse` instance.
public init(
request: URLRequest?,
response: HTTPURLResponse?,
data: Data?,
result: Result<Value>,
timeline: Timeline = Timeline())
{
self.request = request
self.response = response
self.data = data
self.result = result
self.timeline = timeline
}
}
// MARK: -
extension DataResponse: CustomStringConvertible, CustomDebugStringConvertible {
/// The textual representation used when written to an output stream, which includes whether the result was a
/// success or failure.
public var description: String {
return result.debugDescription
}
/// The debug textual representation used when written to an output stream, which includes the URL request, the URL
/// response, the server data, the response serialization result and the timeline.
public var debugDescription: String {
var output: [String] = []
output.append(request != nil ? "[Request]: \(request!.httpMethod ?? "GET") \(request!)" : "[Request]: nil")
output.append(response != nil ? "[Response]: \(response!)" : "[Response]: nil")
output.append("[Data]: \(data?.count ?? 0) bytes")
output.append("[Result]: \(result.debugDescription)")
output.append("[Timeline]: \(timeline.debugDescription)")
return output.joined(separator: "\n")
}
}
// MARK: -
extension DataResponse {
/// Evaluates the specified closure when the result of this `DataResponse` is a success, passing the unwrapped
/// result value as a parameter.
///
/// Use the `map` method with a closure that does not throw. For example:
///
/// let possibleData: DataResponse<Data> = ...
/// let possibleInt = possibleData.map { $0.count }
///
/// - parameter transform: A closure that takes the success value of the instance's result.
///
/// - returns: A `DataResponse` whose result wraps the value returned by the given closure. If this instance's
/// result is a failure, returns a response wrapping the same failure.
public func map<T>(_ transform: (Value) -> T) -> DataResponse<T> {
var response = DataResponse<T>(
request: request,
response: self.response,
data: data,
result: result.map(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
/// Evaluates the given closure when the result of this `DataResponse` is a success, passing the unwrapped result
/// value as a parameter.
///
/// Use the `flatMap` method with a closure that may throw an error. For example:
///
/// let possibleData: DataResponse<Data> = ...
/// let possibleObject = possibleData.flatMap {
/// try JSONSerialization.jsonObject(with: $0)
/// }
///
/// - parameter transform: A closure that takes the success value of the instance's result.
///
/// - returns: A success or failure `DataResponse` depending on the result of the given closure. If this instance's
/// result is a failure, returns the same failure.
public func flatMap<T>(_ transform: (Value) throws -> T) -> DataResponse<T> {
var response = DataResponse<T>(
request: request,
response: self.response,
data: data,
result: result.flatMap(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
/// Evaluates the specified closure when the `DataResponse` is a failure, passing the unwrapped error as a parameter.
///
/// Use the `mapError` function with a closure that does not throw. For example:
///
/// let possibleData: DataResponse<Data> = ...
/// let withMyError = possibleData.mapError { MyError.error($0) }
///
/// - Parameter transform: A closure that takes the error of the instance.
/// - Returns: A `DataResponse` instance containing the result of the transform.
public func mapError<E: Error>(_ transform: (Error) -> E) -> DataResponse {
var response = DataResponse(
request: request,
response: self.response,
data: data,
result: result.mapError(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
/// Evaluates the specified closure when the `DataResponse` is a failure, passing the unwrapped error as a parameter.
///
/// Use the `flatMapError` function with a closure that may throw an error. For example:
///
/// let possibleData: DataResponse<Data> = ...
/// let possibleObject = possibleData.flatMapError {
/// try someFailableFunction(taking: $0)
/// }
///
/// - Parameter transform: A throwing closure that takes the error of the instance.
///
/// - Returns: A `DataResponse` instance containing the result of the transform.
public func flatMapError<E: Error>(_ transform: (Error) throws -> E) -> DataResponse {
var response = DataResponse(
request: request,
response: self.response,
data: data,
result: result.flatMapError(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
}
// MARK: -
/// Used to store all data associated with an non-serialized response of a download request.
public struct DefaultDownloadResponse {
/// The URL request sent to the server.
public let request: URLRequest?
/// The server's response to the URL request.
public let response: HTTPURLResponse?
/// The temporary destination URL of the data returned from the server.
public let temporaryURL: URL?
/// The final destination URL of the data returned from the server if it was moved.
public let destinationURL: URL?
/// The resume data generated if the request was cancelled.
public let resumeData: Data?
/// The error encountered while executing or validating the request.
public let error: Error?
/// The timeline of the complete lifecycle of the request.
public let timeline: Timeline
var _metrics: AnyObject?
/// Creates a `DefaultDownloadResponse` instance from the specified parameters.
///
/// - Parameters:
/// - request: The URL request sent to the server.
/// - response: The server's response to the URL request.
/// - temporaryURL: The temporary destination URL of the data returned from the server.
/// - destinationURL: The final destination URL of the data returned from the server if it was moved.
/// - resumeData: The resume data generated if the request was cancelled.
/// - error: The error encountered while executing or validating the request.
/// - timeline: The timeline of the complete lifecycle of the request. `Timeline()` by default.
/// - metrics: The task metrics containing the request / response statistics. `nil` by default.
public init(
request: URLRequest?,
response: HTTPURLResponse?,
temporaryURL: URL?,
destinationURL: URL?,
resumeData: Data?,
error: Error?,
timeline: Timeline = Timeline(),
metrics: AnyObject? = nil)
{
self.request = request
self.response = response
self.temporaryURL = temporaryURL
self.destinationURL = destinationURL
self.resumeData = resumeData
self.error = error
self.timeline = timeline
}
}
// MARK: -
/// Used to store all data associated with a serialized response of a download request.
public struct DownloadResponse<Value> {
/// The URL request sent to the server.
public let request: URLRequest?
/// The server's response to the URL request.
public let response: HTTPURLResponse?
/// The temporary destination URL of the data returned from the server.
public let temporaryURL: URL?
/// The final destination URL of the data returned from the server if it was moved.
public let destinationURL: URL?
/// The resume data generated if the request was cancelled.
public let resumeData: Data?
/// The result of response serialization.
public let result: Result<Value>
/// The timeline of the complete lifecycle of the request.
public let timeline: Timeline
/// Returns the associated value of the result if it is a success, `nil` otherwise.
public var value: Value? { return result.value }
/// Returns the associated error value if the result if it is a failure, `nil` otherwise.
public var error: Error? { return result.error }
var _metrics: AnyObject?
/// Creates a `DownloadResponse` instance with the specified parameters derived from response serialization.
///
/// - parameter request: The URL request sent to the server.
/// - parameter response: The server's response to the URL request.
/// - parameter temporaryURL: The temporary destination URL of the data returned from the server.
/// - parameter destinationURL: The final destination URL of the data returned from the server if it was moved.
/// - parameter resumeData: The resume data generated if the request was cancelled.
/// - parameter result: The result of response serialization.
/// - parameter timeline: The timeline of the complete lifecycle of the `Request`. Defaults to `Timeline()`.
///
/// - returns: The new `DownloadResponse` instance.
public init(
request: URLRequest?,
response: HTTPURLResponse?,
temporaryURL: URL?,
destinationURL: URL?,
resumeData: Data?,
result: Result<Value>,
timeline: Timeline = Timeline())
{
self.request = request
self.response = response
self.temporaryURL = temporaryURL
self.destinationURL = destinationURL
self.resumeData = resumeData
self.result = result
self.timeline = timeline
}
}
// MARK: -
extension DownloadResponse: CustomStringConvertible, CustomDebugStringConvertible {
/// The textual representation used when written to an output stream, which includes whether the result was a
/// success or failure.
public var description: String {
return result.debugDescription
}
/// The debug textual representation used when written to an output stream, which includes the URL request, the URL
/// response, the temporary and destination URLs, the resume data, the response serialization result and the
/// timeline.
public var debugDescription: String {
var output: [String] = []
output.append(request != nil ? "[Request]: \(request!.httpMethod ?? "GET") \(request!)" : "[Request]: nil")
output.append(response != nil ? "[Response]: \(response!)" : "[Response]: nil")
output.append("[TemporaryURL]: \(temporaryURL?.path ?? "nil")")
output.append("[DestinationURL]: \(destinationURL?.path ?? "nil")")
output.append("[ResumeData]: \(resumeData?.count ?? 0) bytes")
output.append("[Result]: \(result.debugDescription)")
output.append("[Timeline]: \(timeline.debugDescription)")
return output.joined(separator: "\n")
}
}
// MARK: -
extension DownloadResponse {
/// Evaluates the given closure when the result of this `DownloadResponse` is a success, passing the unwrapped
/// result value as a parameter.
///
/// Use the `map` method with a closure that does not throw. For example:
///
/// let possibleData: DownloadResponse<Data> = ...
/// let possibleInt = possibleData.map { $0.count }
///
/// - parameter transform: A closure that takes the success value of the instance's result.
///
/// - returns: A `DownloadResponse` whose result wraps the value returned by the given closure. If this instance's
/// result is a failure, returns a response wrapping the same failure.
public func map<T>(_ transform: (Value) -> T) -> DownloadResponse<T> {
var response = DownloadResponse<T>(
request: request,
response: self.response,
temporaryURL: temporaryURL,
destinationURL: destinationURL,
resumeData: resumeData,
result: result.map(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
/// Evaluates the given closure when the result of this `DownloadResponse` is a success, passing the unwrapped
/// result value as a parameter.
///
/// Use the `flatMap` method with a closure that may throw an error. For example:
///
/// let possibleData: DownloadResponse<Data> = ...
/// let possibleObject = possibleData.flatMap {
/// try JSONSerialization.jsonObject(with: $0)
/// }
///
/// - parameter transform: A closure that takes the success value of the instance's result.
///
/// - returns: A success or failure `DownloadResponse` depending on the result of the given closure. If this
/// instance's result is a failure, returns the same failure.
public func flatMap<T>(_ transform: (Value) throws -> T) -> DownloadResponse<T> {
var response = DownloadResponse<T>(
request: request,
response: self.response,
temporaryURL: temporaryURL,
destinationURL: destinationURL,
resumeData: resumeData,
result: result.flatMap(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
/// Evaluates the specified closure when the `DownloadResponse` is a failure, passing the unwrapped error as a parameter.
///
/// Use the `mapError` function with a closure that does not throw. For example:
///
/// let possibleData: DownloadResponse<Data> = ...
/// let withMyError = possibleData.mapError { MyError.error($0) }
///
/// - Parameter transform: A closure that takes the error of the instance.
/// - Returns: A `DownloadResponse` instance containing the result of the transform.
public func mapError<E: Error>(_ transform: (Error) -> E) -> DownloadResponse {
var response = DownloadResponse(
request: request,
response: self.response,
temporaryURL: temporaryURL,
destinationURL: destinationURL,
resumeData: resumeData,
result: result.mapError(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
/// Evaluates the specified closure when the `DownloadResponse` is a failure, passing the unwrapped error as a parameter.
///
/// Use the `flatMapError` function with a closure that may throw an error. For example:
///
/// let possibleData: DownloadResponse<Data> = ...
/// let possibleObject = possibleData.flatMapError {
/// try someFailableFunction(taking: $0)
/// }
///
/// - Parameter transform: A throwing closure that takes the error of the instance.
///
/// - Returns: A `DownloadResponse` instance containing the result of the transform.
public func flatMapError<E: Error>(_ transform: (Error) throws -> E) -> DownloadResponse {
var response = DownloadResponse(
request: request,
response: self.response,
temporaryURL: temporaryURL,
destinationURL: destinationURL,
resumeData: resumeData,
result: result.flatMapError(transform),
timeline: timeline
)
response._metrics = _metrics
return response
}
}
// MARK: -
protocol Response {
/// The task metrics containing the request / response statistics.
var _metrics: AnyObject? { get set }
mutating func add(_ metrics: AnyObject?)
}
extension Response {
mutating func add(_ metrics: AnyObject?) {
#if !os(watchOS)
guard #available(iOS 10.0, macOS 10.12, tvOS 10.0, *) else { return }
guard let metrics = metrics as? URLSessionTaskMetrics else { return }
_metrics = metrics
#endif
}
}
// MARK: -
@available(iOS 10.0, macOS 10.12, tvOS 10.0, *)
extension DefaultDataResponse: Response {
#if !os(watchOS)
/// The task metrics containing the request / response statistics.
public var metrics: URLSessionTaskMetrics? { return _metrics as? URLSessionTaskMetrics }
#endif
}
@available(iOS 10.0, macOS 10.12, tvOS 10.0, *)
extension DataResponse: Response {
#if !os(watchOS)
/// The task metrics containing the request / response statistics.
public var metrics: URLSessionTaskMetrics? { return _metrics as? URLSessionTaskMetrics }
#endif
}
@available(iOS 10.0, macOS 10.12, tvOS 10.0, *)
extension DefaultDownloadResponse: Response {
#if !os(watchOS)
/// The task metrics containing the request / response statistics.
public var metrics: URLSessionTaskMetrics? { return _metrics as? URLSessionTaskMetrics }
#endif
}
@available(iOS 10.0, macOS 10.12, tvOS 10.0, *)
extension DownloadResponse: Response {
#if !os(watchOS)
/// The task metrics containing the request / response statistics.
public var metrics: URLSessionTaskMetrics? { return _metrics as? URLSessionTaskMetrics }
#endif
}