* Headers/Foundation/NSKeyValueObserving.h,

* Source/NSKeyValueObserving.m: Add method
        -keyPathsForValuesAffectingValueForKey:.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@37636 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,9 @@
+2014-01-26  Fred Kiefer <FredKiefer@gmx.de>
+
+	* Headers/Foundation/NSKeyValueObserving.h,
+	* Source/NSKeyValueObserving.m: Add method
+	-keyPathsForValuesAffectingValueForKey:.
+
 2014-01-25  Frederik <ego@frederikseiffert.de>
 
 	* Source/NSKeyValueObserving.m: When using

Headers/Foundation/NSKeyValueObserving.h

@@ -202,7 +202,6 @@ GS_EXPORT NSString *const NSKeyValueChangeNotificationIsPriorKey;
  * These methods permit modifications to the observing system.
  */
 @interface NSObject(NSKeyValueObservingCustomization)
-
 /**
  * Specifies whether the class should send the notification methods of
  * the NSKeyValueObserverNotification protocol when instances of the
@@ -219,6 +218,15 @@ GS_EXPORT NSString *const NSKeyValueChangeNotificationIsPriorKey;
 + (void) setKeys: (NSArray*)triggerKeys
 triggerChangeNotificationsForDependentKey: (NSString*)dependentKey;
 
+
+#if OS_API_VERSION(MAC_OS_X_VERSION_10_5,GS_API_LATEST)
+/**
+ * Returns a set of key paths for properties whose values affect the value
+ * of the specified dependentKey.
+ */
++ (NSSet*) keyPathsForValuesAffectingValueForKey: (NSString*)dependentKey;
+#endif
+
 /**
  * Returns a reference to the observation information for the receiver
  * as stored using the -setObservationInfo: method.<br />

Source/NSKeyValueObserving.m

@@ -2016,6 +2016,32 @@ triggerChangeNotificationsForDependentKey: (NSString*)dependentKey
     }
 }
 
++ (NSSet*) keyPathsForValuesAffectingValueForKey: (NSString*)dependentKey
+{
+  NSString *selString = [NSString stringWithFormat: @"keyPathsForValuesAffecting%@",
+                                  dependentKey];
+  SEL sel = NSSelectorFromString(selString);
+  NSMapTable *affectingKeys;
+  NSEnumerator *enumerator;
+  NSString *affectingKey;
+  NSMutableSet *keyPaths;
+
+  if ([self respondsToSelector: sel])
+    {
+      return [self performSelector: sel];
+    }
+
+  affectingKeys = NSMapGet(dependentKeyTable, self);
+  keyPaths = [[NSMutableSet alloc] initWithCapacity: [affectingKeys count]];
+  enumerator = [affectingKeys keyEnumerator];
+  while ((affectingKey = [enumerator nextObject]))
+    {
+      [keyPaths addObject: affectingKey];
+    }
+
+  return AUTORELEASE(keyPaths);
+}
+
 - (void*) observationInfo
 {
   void	*info;