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From Leszek Gawron <>
Subject Re: [RT] POJOfied Environment
Date Wed, 11 May 2005 14:04:00 GMT
Daniel Fagerstrom wrote:
> In the current #{$cocoon/request/request/protocol} thread we (again) 
> discuss problems with the environment access in JXTG. The problems comes 
> from that we have copied part of the servlet api in our environment 
> abstraction and that it contains methods of the type "Object 
> getAttribute(String)", which isn't recoginized by typical bean 
> reflection or expression languages.
> To solve this we have implemented (far to many) wrappers in modules, 
> flow, jxtg and probably other places. In flow/jxtg, the situation is 
> more or less a mess.
> Anyway, to save us from wasting our time in reinventing the "servlet api 
> reflection" wheel again and again in the future, we should IMO instead 
> "POJOfy" our environment abstraction. So that any decent bean reflection 
> implementation can access the attributes and parameters whithout any 
> extra hacks.
> As Vadim pointed out in an earlier discussion this is done in Java 
> faces: 

> So what I propose is that we extend o.a.c.environment.Request with:
>  Map getAttributes();
>  Map getParameters();
>  Map getHeaders();
> o.a.c.environment.Session and o.a.c.environment.Context with:
>  Map getAttributes();
> possibly there are more. Java Faces use getRequestMap etc instead, but 
> the plural "s" is closer to our current conventions.
>                         --- o0o ---
> As this is an interface change I'm of course only talking about 2.2. 
>  From an implementation POV we could implement the new methods in terms 
> of the old ones in an AbstractRequest etc, so it would be quite easy to 
> introduce it in the various environments.
> Of course we could put the above methods in still another wrapper, but I 
> think we have tried that path without success allready, so I would 
> prefer to put it directly in the environment.
> For those not familiar with the Cocoon internals it should maybe be 
> mentioned that although the Cocoon environment is close to the 
> HTTPServlet environment it is not the same, so we are free to add 
> whatevere we want to.
totally +1. The inconsistency between what is available from flow, JEXL 
and JXPath is irritating.

Leszek Gawron                            
IT Manager                                         MobileBox sp. z o.o.
+48 (61) 855 06 67                    
mobile: +48 (501) 720 812                       fax: +48 (61) 853 29 65

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