cleanup

HardcoreData/NSManagedObjectContext+Transaction.swift

@@ -0,0 +1,183 @@
+//
+//  NSManagedObjectContext+Transaction.swift
+//  HardcoreData
+//
+//  Copyright (c) 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
+import GCDKit
+
+
+// MARK: - NSManagedObjectContext
+
+internal extension NSManagedObjectContext {
+    
+    // MARK: - Internal
+    
+    internal weak var parentTransaction: DataTransaction? {
+        
+        get {
+            
+            return self.getAssociatedObjectForKey(&PropertyKeys.parentTransaction)
+        }
+        set {
+            
+            self.setAssociatedWeakObject(
+                newValue,
+                forKey: &PropertyKeys.parentTransaction)
+        }
+    }
+    
+    internal func temporaryContextInTransaction(transaction: DataTransaction?) -> NSManagedObjectContext {
+        
+        let context = NSManagedObjectContext(concurrencyType: .PrivateQueueConcurrencyType)
+        context.parentContext = self
+        context.parentStack = self.parentStack
+        context.setupForHardcoreDataWithContextName("com.hardcoredata.temporarycontext")
+        context.shouldCascadeSavesToParent = true
+        
+        return context
+    }
+    
+    internal func saveSynchronously() -> SaveResult {
+        
+        var result = SaveResult(hasChanges: false)
+        self.performBlockAndWait {
+            [unowned self] () -> Void in
+            
+            if !self.hasChanges {
+                
+                self.reset()
+                return
+            }
+            
+            var saveError: NSError?
+            if self.save(&saveError) {
+                
+                if self.shouldCascadeSavesToParent {
+                    
+                    if let parentContext = self.parentContext {
+                        
+                        switch parentContext.saveSynchronously() {
+                            
+                        case .Success(let hasChanges):
+                            result = SaveResult(hasChanges: true)
+                        case .Failure(let error):
+                            result = SaveResult(error)
+                        }
+                        return
+                    }
+                }
+                
+                result = SaveResult(hasChanges: true)
+            }
+            else if let error = saveError {
+                
+                HardcoreData.handleError(
+                    error,
+                    "Failed to save NSManagedObjectContext.")
+                result = SaveResult(error)
+            }
+            else {
+                
+                result = SaveResult(hasChanges: false)
+            }
+        }
+        
+        return result
+    }
+    
+    internal func saveAsynchronouslyWithCompletion(completion: ((result: SaveResult) -> Void)?) {
+        
+        self.performBlock { () -> Void in
+            
+            if !self.hasChanges {
+                
+                if let completion = completion {
+                    
+                    GCDQueue.Main.async {
+                        
+                        completion(result: SaveResult(hasChanges: false))
+                    }
+                }
+                return
+            }
+            
+            var saveError: NSError?
+            if self.save(&saveError) {
+                
+                if self.shouldCascadeSavesToParent {
+                    
+                    if let parentContext = self.parentContext {
+                        
+                        let result = parentContext.saveSynchronously()
+                        if let completion = completion {
+                            
+                            GCDQueue.Main.async {
+                                
+                                completion(result: result)
+                            }
+                        }
+                        return
+                    }
+                }
+                
+                if let completion = completion {
+                    
+                    GCDQueue.Main.async {
+                        
+                        completion(result: SaveResult(hasChanges: true))
+                    }
+                }
+            }
+            else if let error = saveError {
+                
+                HardcoreData.handleError(
+                    error,
+                    "Failed to save NSManagedObjectContext.")
+                if let completion = completion {
+                    
+                    GCDQueue.Main.async {
+                        
+                        completion(result: SaveResult(error))
+                    }
+                }
+            }
+            else if let completion = completion {
+                
+                GCDQueue.Main.async {
+                    
+                    completion(result: SaveResult(hasChanges: false))
+                }
+            }
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    private struct PropertyKeys {
+        
+        static var parentTransaction: Void?
+    }
+}