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From Marcus Lindblom <>
Subject Re: Customizable handling of unset properties
Date Tue, 19 Sep 2006 11:33:53 GMT
Sorry for bouncing. I'm just wondering if there is somewhere (other than 
this list) where this is better dicusssed?


Marcus Lindblom wrote:
> Hi,
> I just want to ask a bit something that probably has been discussed to 
> death before: unset properties handling. The latest 1.7 does not 
> address this (according to the release notes), and I could find no 
> enhancement request discussing it either.
> So, my simple proposal is:
> Allow the user to set a custom handler for resolving properties (with 
> the option to handle unset properties as errors), similar to setting 
> build listeners.
> We've been running with a modified Ant 1.6.2 for some time that simply 
> throws an exception if a non-set property is accessed (when another 
> propery is set, namely ant.disallow_unset_properties). It works really 
> nice for us and has helped finding quite a few bugs (that's why we 
> added it in the first place), but a more general solution would be to 
> provide various property-policies. That way, I could resolve my other 
> issue (see my recent post) that way as well, making it a bit more 
> transparent.
> Comments?
> Cheers,
> /Marcus
> P.S. I could probably check out 1.7 and make a patch myself, if you 
> guys think it's worthwhile to include in the future.
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