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Re: overriding certain NSKeyValueCoding methods in EOs
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Re: overriding certain NSKeyValueCoding methods in EOs


  • Subject: Re: overriding certain NSKeyValueCoding methods in EOs
  • From: Chuck Hill <email@hidden>
  • Date: Mon, 16 Apr 2007 09:48:30 -0700

Florijan,

You are violating the virginal purity of EOF will be burn in the hell of EOF stack traces for all eternity.

Happy now?  :-)

Seriously, what you are doing seems quite OK. KVC is just a way of translating a string into a value. How you choose to the the translation is up to you. I am certain that you can find something that will break something else, but you will have to work at it. I make quite a bit of use of KVC extensions for purposes as does WireHose and (I think) Wonder.

Here is a fun alternative to declaring public instance variables to hold binding values in a WOComponent subclass:


public NSMutableDictionary dynamicData = new NSMutableDictionary();

public Object handleQueryWithUnboundKey(String key) {
Object result = dynamicData.objectForKey(key);
// Helps to find typing errors in bindings
if (result == null) NSLog.out.appendln("no value found for key " + key);
return result;
}


public void handleTakeValueForUnboundKey(Object value, String key) {
    dynamicData.setObjectForKey(value, key);
}



Chuck



On Apr 16, 2007, at 6:42 AM, Florijan Stamenkovic wrote:

Hi Pierre,

Thanks for the reply. I think that would be a good point to try to implement this. And as nobody came up with "this will break EOF and you will burn in WO hell for all eternity", I suppose the idea is worthwhile trying out.

Cheers,
Flor

Take a look at this:

http://developer.apple.com/documentation/WebObjects/Reference/API/ com/webobjects/foundation/ NSKeyValueCoding.ErrorHandling.html#handleQueryWithUnboundKey (java.lang.String)

Pierre Bernard
Houdah Software s.à r.l.

On Apr 15, 2007, at 1:50 PM, Florijan Stamenkovic wrote:

Hi all,


I have an idea, but am not sure if it would be EOF acceptable. Essentially, I would like to expand the KVC system somewhat. The point would be this:



public Object valueForKey(String key){ try{ return super.valueForKey(key); }catch(Exception ex){ Object rVal = valueForCustomKey(key); if(rVal != null) return rVal; throw ex; } }

public Object valueForCustomKey(String key){
	//	find a key in another system as EOF's KVC
	...
}


So, if there is not EOF result for a key, try the additional implementation. It would be ideal of course to get this to work with the rest of KVC, to enable sums, counts, and all that stuff on custom keys as well. What I am thinking / hoping at the moment is that KVC is implemented so that for retrieving and setting values for keys it relies on a narrow set of methods (NSKeyValueCoding interface only???)...


Any words of wisdom?

Thanks!
Florijan
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References: 
 >overriding certain NSKeyValueCoding methods in EOs (From: Florijan Stamenkovic <email@hidden>)
 >Re: overriding certain NSKeyValueCoding methods in EOs (From: Pierre Bernard <email@hidden>)
 >Re: overriding certain NSKeyValueCoding methods in EOs (From: Florijan Stamenkovic <email@hidden>)

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