Flatten file directories (fixes #159)

Sources/CoreStoreFetchedResultsController.swift

@@ -0,0 +1,119 @@
+//
+//  CoreStoreFetchedResultsController.swift
+//  CoreStore
+//
+//  Copyright © 2016 John Rommel Estropia
+//
+//  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
+import CoreData
+
+
+#if os(iOS) || os(watchOS) || os(tvOS)
+
+// MARK: - CoreStoreFetchedResultsController
+
+internal final class CoreStoreFetchedResultsController: NSFetchedResultsController<NSManagedObject> {
+    
+    // MARK: Internal
+    
+    @nonobjc
+    internal convenience init<T: NSManagedObject>(dataStack: DataStack, fetchRequest: NSFetchRequest<NSManagedObject>, from: From<T>? = nil, sectionBy: SectionBy? = nil, applyFetchClauses: @escaping (_ fetchRequest: NSFetchRequest<NSManagedObject>) -> Void) {
+        
+        self.init(
+            context: dataStack.mainContext,
+            fetchRequest: fetchRequest,
+            from: from,
+            sectionBy: sectionBy,
+            applyFetchClauses: applyFetchClauses
+        )
+    }
+    
+    @nonobjc
+    internal init<T: NSManagedObject>(context: NSManagedObjectContext, fetchRequest: NSFetchRequest<NSManagedObject>, from: From<T>? = nil, sectionBy: SectionBy? = nil, applyFetchClauses: @escaping (_ fetchRequest: NSFetchRequest<NSManagedObject>) -> Void) {
+        
+        _ = from?.applyToFetchRequest(
+            fetchRequest,
+            context: context,
+            applyAffectedStores: false
+        )
+        applyFetchClauses(fetchRequest)
+        
+        if let from = from {
+            
+            self.reapplyAffectedStores = { fetchRequest, context in
+                
+                return from.applyAffectedStoresForFetchedRequest(fetchRequest, context: context)
+            }
+        }
+        else {
+            
+            guard let from = (fetchRequest.entity.flatMap { $0.managedObjectClassName }).flatMap(NSClassFromString).flatMap(From.init) else {
+                
+                CoreStore.abort("Attempted to create a \(CoreStoreFetchedResultsController.self) without a \(cs_typeName(From<T>.self)) clause or an \(cs_typeName(NSEntityDescription.self)).")
+            }
+            
+            self.reapplyAffectedStores = { fetchRequest, context in
+                
+                return from.applyAffectedStoresForFetchedRequest(fetchRequest, context: context)
+            }
+        }
+        
+        super.init(
+            fetchRequest: fetchRequest,
+            managedObjectContext: context,
+            sectionNameKeyPath: sectionBy?.sectionKeyPath,
+            cacheName: nil
+        )
+    }
+    
+    @nonobjc
+    internal func performFetchFromSpecifiedStores() throws {
+        
+        if !self.reapplyAffectedStores(self.fetchRequest, self.managedObjectContext) {
+            
+            CoreStore.log(
+                .warning,
+                message: "Attempted to perform a fetch on an \(cs_typeName(self)) but could not find any persistent store for the entity \(cs_typeName(self.fetchRequest.entityName))"
+            )
+        }
+        try self.performFetch()
+    }
+    
+    @nonobjc
+    internal func dynamicCast<U: NSFetchRequestResult>() -> NSFetchedResultsController<U> {
+        
+        return unsafeBitCast(self, to: NSFetchedResultsController<U>.self)
+    }
+    
+    deinit {
+        
+        self.delegate = nil
+    }
+    
+    
+    // MARK: Private
+    
+    @nonobjc
+    private let reapplyAffectedStores: (_ fetchRequest: NSFetchRequest<NSManagedObject>, _ context: NSManagedObjectContext) -> Bool
+}
+
+#endif