Swift Package Manager support

Sources/Internal/NSManagedObjectContext+Transaction.swift

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+//
+//  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
+#if USE_FRAMEWORKS
+    import GCDKit
+#endif
+
+
+// MARK: - NSManagedObjectContext
+
+internal extension NSManagedObjectContext {
+    
+    // MARK: Internal
+    
+    internal weak var parentTransaction: BaseDataTransaction? {
+        
+        get {
+            
+            return getAssociatedObjectForKey(
+                &PropertyKeys.parentTransaction,
+                inObject: self
+            )
+        }
+        set {
+            
+            setAssociatedWeakObject(
+                newValue,
+                forKey: &PropertyKeys.parentTransaction,
+                inObject: self
+            )
+        }
+    }
+    
+    internal func isRunningInAllowedQueue() -> Bool {
+        
+        guard let parentTransaction = self.parentTransaction else {
+            
+            return false
+        }
+        return parentTransaction.isRunningInAllowedQueue()
+    }
+    
+    internal func temporaryContextInTransactionWithConcurrencyType(concurrencyType: NSManagedObjectContextConcurrencyType) -> NSManagedObjectContext {
+        
+        let context = NSManagedObjectContext(concurrencyType: concurrencyType)
+        context.parentContext = self
+        context.parentStack = self.parentStack
+        context.setupForCoreStoreWithContextName("com.corestore.temporarycontext")
+        context.shouldCascadeSavesToParent = (self.parentStack?.rootSavingContext == self)
+        context.retainsRegisteredObjects = true
+        
+        return context
+    }
+    
+    internal func saveSynchronously() -> SaveResult {
+        
+        var result = SaveResult(hasChanges: false)
+        
+        self.performBlockAndWait { [unowned self] () -> Void in
+            
+            guard self.hasChanges else {
+                
+                return
+            }
+            
+            do {
+                
+                try self.save()
+            }
+            catch {
+                
+                let saveError = error as NSError
+                CoreStore.handleError(
+                    saveError,
+                    "Failed to save \(typeName(NSManagedObjectContext))."
+                )
+                result = SaveResult(saveError)
+                return
+            }
+            
+            if let parentContext = self.parentContext where self.shouldCascadeSavesToParent {
+                
+                switch parentContext.saveSynchronously() {
+                    
+                case .Success:
+                    result = SaveResult(hasChanges: true)
+                    
+                case .Failure(let error):
+                    result = SaveResult(error)
+                }
+            }
+            else {
+                
+                result = SaveResult(hasChanges: true)
+            }
+        }
+        
+        return result
+    }
+    
+    internal func saveAsynchronouslyWithCompletion(completion: ((result: SaveResult) -> Void) = { _ in }) {
+        
+        self.performBlock { () -> Void in
+            
+            guard self.hasChanges else {
+                
+                GCDQueue.Main.async {
+                    
+                    completion(result: SaveResult(hasChanges: false))
+                }
+                return
+            }
+            
+            do {
+                
+                try self.save()
+            }
+            catch {
+                
+                let saveError = error as NSError
+                CoreStore.handleError(
+                    saveError,
+                    "Failed to save \(typeName(NSManagedObjectContext))."
+                )
+                GCDQueue.Main.async {
+                    
+                    completion(result: SaveResult(saveError))
+                }
+                return
+            }
+            
+            if let parentContext = self.parentContext where self.shouldCascadeSavesToParent {
+                
+                parentContext.saveAsynchronouslyWithCompletion(completion)
+            }
+            else {
+                
+                GCDQueue.Main.async {
+                    
+                    completion(result: SaveResult(hasChanges: true))
+                }
+            }
+        }
+    }
+    
+    internal func refreshAllObjectsAsFaults() {
+        
+        if #available(iOS 8.3, OSX 10.11, *) {
+            
+            self.refreshAllObjects()
+        }
+        else {
+            
+            self.registeredObjects.forEach { self.refreshObject($0, mergeChanges: false) }
+        }
+    }
+    
+    
+    // MARK: Private
+    
+    private struct PropertyKeys {
+        
+        static var parentTransaction: Void?
+    }
+}