Flatten file directories (fixes #159)

Sources/NotificationObserver.swift

@@ -0,0 +1,51 @@
+//
+//  NotificationObserver.swift
+//  CoreStore
+//
+//  Copyright © 2014 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
+
+
+// MARK: - NotificationObserver
+
+internal final class NotificationObserver {
+    
+    // MARK: Public
+    
+    let observer: NSObjectProtocol
+    
+    init(notificationName: Notification.Name, object: Any?, queue: OperationQueue? = nil, closure: @escaping (_ note: Notification) -> Void) {
+        
+        self.observer = NotificationCenter.default.addObserver(
+            forName: notificationName,
+            object: object,
+            queue: queue,
+            using: closure
+        )
+    }
+    
+    deinit {
+        
+        NotificationCenter.default.removeObserver(self.observer)
+    }
+}