Flatten file directories (fixes #159)

Sources/NSManagedObjectContext+Transaction.swift

@@ -0,0 +1,262 @@
+//
+//  NSManagedObjectContext+Transaction.swift
+//  CoreStore
+//
+//  Copyright © 2015 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
+
+
+// MARK: - NSManagedObjectContext
+
+internal extension NSManagedObjectContext {
+    
+    // MARK: Internal
+    
+    @nonobjc
+    internal weak var parentTransaction: BaseDataTransaction? {
+        
+        get {
+            
+            return cs_getAssociatedObjectForKey(
+                &PropertyKeys.parentTransaction,
+                inObject: self
+            )
+        }
+        set {
+            
+            cs_setAssociatedWeakObject(
+                newValue,
+                forKey: &PropertyKeys.parentTransaction,
+                inObject: self
+            )
+        }
+    }
+    
+    @nonobjc
+    internal var isSavingSynchronously: Bool? {
+        
+        get {
+            
+            let value: NSNumber? = cs_getAssociatedObjectForKey(
+                &PropertyKeys.isSavingSynchronously,
+                inObject: self
+            )
+            return value?.boolValue
+        }
+        set {
+            
+            cs_setAssociatedWeakObject(
+                newValue.flatMap { NSNumber(value: $0) },
+                forKey: &PropertyKeys.isSavingSynchronously,
+                inObject: self
+            )
+        }
+    }
+    
+    @nonobjc
+    internal var isTransactionContext: Bool {
+        
+        get {
+            
+            let value: NSNumber? = cs_getAssociatedObjectForKey(
+                &PropertyKeys.isTransactionContext,
+                inObject: self
+            )
+            return value?.boolValue == true
+        }
+        set {
+            
+            cs_setAssociatedCopiedObject(
+                NSNumber(value: newValue),
+                forKey: &PropertyKeys.isTransactionContext,
+                inObject: self
+            )
+        }
+    }
+    
+    @nonobjc
+    internal var isDataStackContext: Bool {
+        
+        get {
+            
+            let value: NSNumber? = cs_getAssociatedObjectForKey(
+                &PropertyKeys.isDataStackContext,
+                inObject: self
+            )
+            return value?.boolValue == true
+        }
+        set {
+            
+            cs_setAssociatedCopiedObject(
+                NSNumber(value: newValue),
+                forKey: &PropertyKeys.isDataStackContext,
+                inObject: self
+            )
+        }
+    }
+    
+    @nonobjc
+    internal func isRunningInAllowedQueue() -> Bool {
+        
+        guard let parentTransaction = self.parentTransaction else {
+            
+            return false
+        }
+        return parentTransaction.isRunningInAllowedQueue()
+    }
+    
+    @nonobjc
+    internal func temporaryContextInTransactionWithConcurrencyType(_ concurrencyType: NSManagedObjectContextConcurrencyType) -> NSManagedObjectContext {
+        
+        let context = NSManagedObjectContext(concurrencyType: concurrencyType)
+        context.parent = self
+        context.parentStack = self.parentStack
+        context.setupForCoreStoreWithContextName("com.corestore.temporarycontext")
+        context.shouldCascadeSavesToParent = (self.parentStack?.rootSavingContext == self)
+        context.retainsRegisteredObjects = true
+        
+        return context
+    }
+    
+    @nonobjc
+    internal func saveSynchronously(waitForMerge: Bool) -> SaveResult {
+      
+        var result = SaveResult(hasChanges: false)
+        
+        self.performAndWait {
+            
+            guard self.hasChanges else {
+                
+                return
+            }
+            
+            do {
+                
+                self.isSavingSynchronously = waitForMerge
+                try self.save()
+                self.isSavingSynchronously = nil
+            }
+            catch {
+                
+                let saveError = CoreStoreError(error)
+                CoreStore.log(
+                    saveError,
+                    "Failed to save \(cs_typeName(NSManagedObjectContext.self))."
+                )
+                result = SaveResult(saveError)
+                return
+            }
+            
+            if let parentContext = self.parent, self.shouldCascadeSavesToParent {
+                
+                switch parentContext.saveSynchronously(waitForMerge: waitForMerge) {
+                    
+                case .success:
+                    result = SaveResult(hasChanges: true)
+                    
+                case .failure(let error):
+                    result = SaveResult(error)
+                }
+            }
+            else {
+                
+                result = SaveResult(hasChanges: true)
+            }
+        }
+        
+        return result
+    }
+    
+    @nonobjc
+    internal func saveAsynchronouslyWithCompletion(_ completion: @escaping ((_ result: SaveResult) -> Void) = { _ in }) {
+        
+        self.perform {
+            
+            guard self.hasChanges else {
+                
+                DispatchQueue.main.async {
+                    
+                    completion(SaveResult(hasChanges: false))
+                }
+                return
+            }
+            
+            do {
+                
+                self.isSavingSynchronously = false
+                try self.save()
+                self.isSavingSynchronously = nil
+            }
+            catch {
+                
+                let saveError = CoreStoreError(error)
+                CoreStore.log(
+                    saveError,
+                    "Failed to save \(cs_typeName(NSManagedObjectContext.self))."
+                )
+                DispatchQueue.main.async {
+                    
+                    completion(SaveResult(saveError))
+                }
+                return
+            }
+            
+            if self.shouldCascadeSavesToParent, let parentContext = self.parent {
+                
+                parentContext.saveAsynchronouslyWithCompletion(completion)
+            }
+            else {
+                
+                DispatchQueue.main.async {
+                    
+                    completion(SaveResult(hasChanges: true))
+                }
+            }
+        }
+    }
+    
+    @nonobjc
+    internal func refreshAndMergeAllObjects() {
+        
+        if #available(iOS 8.3, OSX 10.11, *) {
+            
+            self.refreshAllObjects()
+        }
+        else {
+            
+            self.registeredObjects.forEach { self.refresh($0, mergeChanges: true) }
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    private struct PropertyKeys {
+        
+        static var parentTransaction: Void?
+        static var isSavingSynchronously: Void?
+        static var isTransactionContext: Void?
+        static var isDataStackContext: Void?
+    }
+}