Flatten file directories (fixes #159)

Sources/MigrationManager.swift

@@ -0,0 +1,62 @@
+//
+//  MigrationManager.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: - MigrationManager
+
+internal final class MigrationManager: NSMigrationManager, ProgressReporting {
+    
+    // MARK: NSObject
+    
+    override func didChangeValue(forKey key: String) {
+        
+        super.didChangeValue(forKey: key)
+        
+        guard key == #keyPath(NSMigrationManager.migrationProgress) else {
+            
+            return
+        }
+        let progress = self.progress
+        progress.completedUnitCount = Int64(Float(progress.totalUnitCount) * self.migrationProgress)
+    }
+    
+    
+    // MARK: NSMigrationManager
+
+    init(sourceModel: NSManagedObjectModel, destinationModel: NSManagedObjectModel, progress: Progress) {
+        
+        self.progress = progress
+        
+        super.init(sourceModel: sourceModel, destinationModel: destinationModel)
+    }
+    
+
+    // MARK: ProgressReporting
+    
+    let progress: Progress
+}