IOSAD-92 hashBasedOnKeys

pEpObjCAdapter/NSObject+Extension.h

@@ -18,4 +18,9 @@
 - (BOOL)isEqualToObject:(NSObject * _Nonnull)other
             basedOnKeys:(NSArray<NSString *> * _Nonnull)keys;
 
+/**
+ Calculates a hash based on the given `keys`.
+ */
+- (NSUInteger)hashBasedOnKeys:(NSArray<NSString *> * _Nonnull)keys;
+
 @end

pEpObjCAdapter/NSObject+Extension.m

@@ -28,4 +28,17 @@
     return YES;
 }
 
+- (NSUInteger)hashBasedOnKeys:(NSArray<NSString *> * _Nonnull)keys
+{
+    NSUInteger prime = 31;
+    NSUInteger result = 1;
+
+    for (NSString *theKey in keys) {
+        NSObject *objSelf = [self valueForKey:theKey];
+        result = prime * result + objSelf.hash;
+    }
+
+    return result;
+}
+
 @end

pEpObjCAdapter/PEPMessage.m

@@ -252,29 +252,7 @@ static NSArray *s_keys;
 
 - (NSUInteger)hash
 {
-    NSUInteger prime = 31;
-    NSUInteger result = 1;
-
-    result = prime * result + self.direction;
-
-    result = prime * result + self.attachments.hash;
-    result = prime * result + self.bcc.hash;
-    result = prime * result + self.cc.hash;
-    result = prime * result + self.from.hash;
-    result = prime * result + self.inReplyTo.hash;
-    result = prime * result + self.keywords.hash;
-    result = prime * result + self.longMessage.hash;
-    result = prime * result + self.longMessageFormatted.hash;
-    result = prime * result + self.messageID.hash;
-    result = prime * result + self.optionalFields.hash;
-    result = prime * result + self.receivedBy.hash;
-    result = prime * result + self.receivedDate.hash;
-    result = prime * result + self.references.hash;
-    result = prime * result + self.replyTo.hash;
-    result = prime * result + self.shortMessage.hash;
-    result = prime * result + self.to.hash;
-
-    return result;
+    return [self hashBasedOnKeys:s_keys];
 }
 
 - (BOOL)isEqual:(id)object