Re[8]: Recent key-value encoding changes to NSObject.

[Manuel Guesdon]

On Mon, 11 Feb 2002 18:10:22 +0000 (GMT) Nicola Pero <address@hidden> wrote:

 >| 
 >| >  >| I suggest that you do as follows in your custom subclass -
 >| >  >| 
 >| > [...]
 >| >  >|   /* If there is an ivar, use it.  */
 >| >  >| This should support all your needs - 
 >| >  >| 
 >| >  >|  ivars take precedence over everything else.
 >| >  >|  dictionary values take precedence over getXXX.
 >| >  >|  getXXX are still used when all else fails.
 >| > 
 >| > But getXXX should be called before ivar access (during the valueForKey 
 >process). :-(
 >| 
 >| You can use storedValueForKey: which looks up ivars before set/get
 >| methods.
 >| 
 >| So I suppose you could change as follows -
 >| 
 >| - (id) storedValueForKey: xxx
 >| {
 >|   if (ivar)
 >|     {
 >|       return [super storedValueForKey: xxx];
 >|     }
 >| 
 >|   if (canFindInDictionary)
 >|     {
 >|       return valueFoundInDictionary;
 >|     }
 >| 
 >|   return [super storedValueForKey: xxx];
 >| }
 >| 
 >| - (id) valueForKey: xxx
 >| {
 >|   if (ivar)
 >|     {
 >|       /* Call storedValueForKey: as that looks up ivars first! */
 >|       return [super storedValueForKey: xxx];
 >|     }
 >| 
 >|   if (canFindInDictionary)
 >|     {
 >|       return valueFoundInDictionary;
 >|     }
 >| 
 >|   /* Call super's implementation.  */
 >|   return [super valueForKey: xxx];
 >| }
 >| 
 >| Modulo all approximations and code to fill in, it might work. :-)

Yes, it should work but IMHO, it's more ugly than my patch (and efficiency 
seems to decrease because we make one more
ivar lookup. Sorry, I still think my patch was more orthogonal.

To close this discussion, if it's really annoy you and Richard, I'll put a copy 
of the NSObject code in the
EOGenericObject and we'll end with this too long thread.

Manuel

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Manuel Guesdon - OXYMIUM <address@hidden>
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