From 283104af3f31bc7012b18799a0e43cf49ae066a0 Mon Sep 17 00:00:00 2001
From: John Rommel Estropia <rommel.estropia@gmail.com>
Date: Sun, 9 Aug 2015 05:04:47 +0900
Subject: [PATCH] thanks to protocol extensions, you can now omit ListObserver
 and ObjectObserver methods you don't need to implement

---
 CoreStore/Observing/ListObserver.swift        | 49 +++++++++++++++++++
 CoreStore/Observing/ObjectObserver.swift      | 19 +++++++
 .../ObjectObserverDemoViewController.swift    |  5 --
 3 files changed, 68 insertions(+), 5 deletions(-)

diff --git a/CoreStore/Observing/ListObserver.swift b/CoreStore/Observing/ListObserver.swift
index 7a9581a..ccb18a7 100644
--- a/CoreStore/Observing/ListObserver.swift
+++ b/CoreStore/Observing/ListObserver.swift
@@ -60,6 +60,19 @@ public protocol ListObserver: class {
     func listMonitorDidChange(monitor: ListMonitor<EntityType>)
 }
 
+public extension ListObserver {
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitorWillChange(monitor: ListMonitor<EntityType>) { }
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitorDidChange(monitor: ListMonitor<EntityType>) { }
+}
+
 
 // MARK: - ListObjectObserver
 
@@ -112,6 +125,29 @@ public protocol ListObjectObserver: ListObserver {
     func listMonitor(monitor: ListMonitor<EntityType>, didMoveObject object: EntityType, fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath)
 }
 
+public extension ListObjectObserver {
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitor(monitor: ListMonitor<EntityType>, didInsertObject object: EntityType, toIndexPath indexPath: NSIndexPath) { }
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitor(monitor: ListMonitor<EntityType>, didDeleteObject object: EntityType, fromIndexPath indexPath: NSIndexPath) { }
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitor(monitor: ListMonitor<EntityType>, didUpdateObject object: EntityType, atIndexPath indexPath: NSIndexPath) { }
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitor(monitor: ListMonitor<EntityType>, didMoveObject object: EntityType, fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) { }
+}
+
 
 // MARK: - ListSectionObserver
 
@@ -145,3 +181,16 @@ public protocol ListSectionObserver: ListObjectObserver {
     */
     func listMonitor(monitor: ListMonitor<EntityType>, didDeleteSection sectionInfo: NSFetchedResultsSectionInfo, fromSectionIndex sectionIndex: Int)
 }
+
+public extension ListSectionObserver {
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitor(monitor: ListMonitor<EntityType>, didInsertSection sectionInfo: NSFetchedResultsSectionInfo, toSectionIndex sectionIndex: Int) { }
+    
+    /**
+    The default implementation does nothing.
+    */
+    func listMonitor(monitor: ListMonitor<EntityType>, didDeleteSection sectionInfo: NSFetchedResultsSectionInfo, fromSectionIndex sectionIndex: Int) { }
+}
diff --git a/CoreStore/Observing/ObjectObserver.swift b/CoreStore/Observing/ObjectObserver.swift
index 40bcbc6..65118ff 100644
--- a/CoreStore/Observing/ObjectObserver.swift
+++ b/CoreStore/Observing/ObjectObserver.swift
@@ -67,3 +67,22 @@ public protocol ObjectObserver: class {
     */
     func objectMonitor(monitor: ObjectMonitor<EntityType>, didDeleteObject object: EntityType)
 }
+
+
+public extension ObjectObserver {
+    
+    /**
+    The default implementation does nothing.
+    */
+    func objectMonitor(monitor: ObjectMonitor<EntityType>, willUpdateObject object: EntityType) { }
+    
+    /**
+    The default implementation does nothing.
+    */
+    func objectMonitor(monitor: ObjectMonitor<EntityType>, didUpdateObject object: EntityType, changedPersistentKeys: Set<KeyPath>) { }
+    
+    /**
+    The default implementation does nothing.
+    */
+    func objectMonitor(monitor: ObjectMonitor<EntityType>, didDeleteObject object: EntityType) { }
+}
diff --git a/CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ObjectObserverDemoViewController.swift b/CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ObjectObserverDemoViewController.swift
index 2942f00..1a004aa 100644
--- a/CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ObjectObserverDemoViewController.swift	
+++ b/CoreStoreDemo/CoreStoreDemo/List and Object Observers Demo/ObjectObserverDemoViewController.swift	
@@ -80,11 +80,6 @@ class ObjectObserverDemoViewController: UIViewController, ObjectObserver {
     
     // MARK: ObjectObserver
     
-    func objectMonitor(monitor: ObjectMonitor<Palette>, willUpdateObject object: Palette) {
-        
-        // none
-    }
-    
     func objectMonitor(monitor: ObjectMonitor<Palette>, didUpdateObject object: Palette, changedPersistentKeys: Set<KeyPath>) {
         
         self.reloadPaletteInfo(object, changedKeys: changedPersistentKeys)