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From Berin Loritsch <blorit...@apache.org>
Subject Re: ParentAware Components Revisited
Date Wed, 22 Oct 2003 17:16:22 GMT
Sylvain Wallez wrote:

> Berin Loritsch wrote:
> 
>> I am still not clear on the purpose of Parent Aware components.  I 
>> can't really
>> see any compelling reason for them, or even how to alot for them in 
>> the Cocoon
>> container heirarchy.
>>
>> I am going to procede without them for now. 
> 
> 
> 
> A ParentAware component has visibility on the component having the same 
> role in the parent container of its own container.
> 
> This is mainly useful for selectors, to allow selectors in a subsitemap 
> to _augment_ the selector with the same role in the parent sitemap. 
> Implementing component inheritance between sitemap and subsitemap is 
> then just a matter of having a ParentAware selector. Upon select(), this 
> selector looks first in its own set of components, and if not found, 
> delegates to the selector in the parent container.
> 
> As I understand it, Fortress may not need this mechanism, since selector 
> is replaced by a lookup on the manager with a "role/hint" string. This 
> means that components with "variants" (don't know how are called these 
> hinted roles) will automatically be inherited by the parent/child 
> relationship of the container.
> 
> Now I don't know how this fits with looking up a selector in the old ECM 
> way...

If that is the case, then we really don't need this.  The CocoonContainer will
work kind of like that by default.

-- 

"They that give up essential liberty to obtain a little temporary safety
  deserve neither liberty nor safety."
                 - Benjamin Franklin


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