mirror of
https://github.com/JohnEstropia/CoreStore.git
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112 lines
4.1 KiB
Swift
112 lines
4.1 KiB
Swift
//
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// CoreStoreFetchedResultsController.swift
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// CoreStore
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//
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// Copyright © 2018 John Rommel Estropia
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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 all
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// 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 THE
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// SOFTWARE.
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//
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import Foundation
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import CoreData
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// MARK: - Internals
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extension Internals {
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// MARK: - CoreStoreFetchedResultsController
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internal final class CoreStoreFetchedResultsController: NSFetchedResultsController<NSManagedObject> {
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// MARK: Internal
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@nonobjc
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internal let typedFetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>
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@nonobjc
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internal convenience init<O>(dataStack: DataStack, fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>, from: From<O>, sectionBy: SectionBy<O>? = nil, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void) {
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self.init(
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context: dataStack.mainContext,
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fetchRequest: fetchRequest,
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from: from,
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sectionBy: sectionBy,
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applyFetchClauses: applyFetchClauses
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)
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}
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@nonobjc
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internal init<O>(context: NSManagedObjectContext, fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>, from: From<O>, sectionBy: SectionBy<O>? = nil, applyFetchClauses: @escaping (_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>) -> Void) {
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_ = try? from.applyToFetchRequest(
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fetchRequest,
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context: context,
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applyAffectedStores: false
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)
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applyFetchClauses(fetchRequest)
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self.typedFetchRequest = fetchRequest
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self.reapplyAffectedStores = { fetchRequest, context in
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try from.applyAffectedStoresForFetchedRequest(fetchRequest, context: context)
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}
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super.init(
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fetchRequest: fetchRequest.staticCast(),
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managedObjectContext: context,
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sectionNameKeyPath: sectionBy?.sectionKeyPath,
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cacheName: nil
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)
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}
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@nonobjc
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internal func performFetchFromSpecifiedStores() throws(any Swift.Error) {
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try self.reapplyAffectedStores(self.typedFetchRequest, self.managedObjectContext)
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try self.performFetch()
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if case let delegate as FetchedDiffableDataSourceSnapshotDelegate = self.delegate {
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delegate.initialFetch()
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}
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}
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@nonobjc
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internal func dynamicCast<U>() -> NSFetchedResultsController<U> {
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return unsafeBitCast(self, to: NSFetchedResultsController<U>.self)
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}
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deinit {
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self.delegate = nil
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}
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// MARK: Private
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@nonobjc
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private let reapplyAffectedStores: (
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_ fetchRequest: Internals.CoreStoreFetchRequest<NSManagedObject>,
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_ context: NSManagedObjectContext
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) throws(any Swift.Error) -> Void
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}
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}
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