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//
// Copyright © 2023 Dennis Müller and all collaborators
//
// 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
/// A type that lets you answer a query made by a call to ``Queryable/Queryable/Trigger/query()``.
@MainActor
public struct QueryResolver<Result>: Sendable {
private let answerHandler: (Result) -> Void
private let cancelHandler: (Error) -> Void
/// A type that lets you answer a query made by a call to ``Queryable/Queryable/Trigger/query()``.
init(
answerHandler: @escaping (Result) -> Void,
errorHandler: @escaping (Error) -> Void
) {
self.answerHandler = answerHandler
self.cancelHandler = errorHandler
}
/// Answers the query with a result.
/// - Parameter result: The result of the query.
public func answer(with result: Result) {
answerHandler(result)
}
/// Answers the query with an optional result. If it is `nil`, this will call ``Queryable/QueryResolver/cancelQuery()``.
/// - Parameter result: The result of the query, as an optional.
public func answer(withOptional optionalResult: Result?) {
if let optionalResult {
answerHandler(optionalResult)
} else {
cancelQuery()
}
}
/// Answers the query.
public func answer() where Result == Void {
answerHandler(())
}
/// Answers the query by throwing an error.
/// - Parameter error: The error to throw.
public func answer(throwing error: Error) {
cancelHandler(error)
}
/// Cancels the query by throwing a ``Queryable/QueryCancellationError`` error.
public func cancelQuery() {
cancelHandler(QueryCancellationError())
}
}