From 271b935ba2ff6e95cde5a56f85abd6ec14f00ba3 Mon Sep 17 00:00:00 2001
From: Alexander Ljungberg <aljungberg@wireload.net>
Date: Tue, 27 Mar 2012 23:42:17 +0100
Subject: [PATCH] `+ (BOOL)automaticallyNotifiesObserversOf<Key>` support.

---
 Foundation/CPKeyValueObserving.j           |  6 +++++
 Tests/Foundation/CPKeyValueObservingTest.j | 26 ++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/Foundation/CPKeyValueObserving.j b/Foundation/CPKeyValueObserving.j
index 86df9ed48..c05d791d9 100644
--- a/Foundation/CPKeyValueObserving.j
+++ b/Foundation/CPKeyValueObserving.j
@@ -71,6 +71,12 @@
 
 + (BOOL)automaticallyNotifiesObserversForKey:(CPString)aKey
 {
+    var capitalizedKey = aKey.charAt(0).toUpperCase() + aKey.substring(1),
+        selector = "automaticallyNotifiesObserversOf" + capitalizedKey;
+
+    if ([[self class] respondsToSelector:selector])
+        return objj_msgSend([self class], selector);
+
     return YES;
 }
 
diff --git a/Tests/Foundation/CPKeyValueObservingTest.j b/Tests/Foundation/CPKeyValueObservingTest.j
index 2d409618f..55c9f5f9d 100644
--- a/Tests/Foundation/CPKeyValueObservingTest.j
+++ b/Tests/Foundation/CPKeyValueObservingTest.j
@@ -193,11 +193,37 @@
          notSame:class_getInstanceMethod([object class], removeSelector)];
 }
 
+- (void)testAutomaticallyNotifiesObserversOf
+{
+    var test = [ObservingTester new];
+
+    [test addObserver:self forKeyPath:@"cheese" options:0 context:nil];
+    [test addObserver:self forKeyPath:@"astronaut" options:0 context:nil];
+
+    // Cheese shouldn't have been affected.
+    [test setCheese:@"changed cheese"];
+    [self assert:@"cheese" equals:_lastKeyPath]
+    [self assert:test equals:_lastObject];
+
+    // Cheese shouldn't have been affected.
+    [test setAstronaut:@"Armstrong"];
+    // Nothing should have been observed because we don't automatically notify
+    // and we didn't call will/didChange.
+    [self assert:@"cheese" equals:_lastKeyPath message:"no observation when automatically notifies is off"];
+    [self assert:test equals:_lastObject];
+}
+
 @end
 
 @implementation ObservingTester : CPObject
 {
     id cheese;
+    id astronaut @accessors;
+}
+
++ (BOOL)automaticallyNotifiesObserversOfAstronaut
+{
+    return NO;
 }
 
 + (id)testerWithCheese:(id)aCheese