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From Bruno Dumon <br...@outerthought.org>
Subject Re: request & response objects
Date Mon, 20 Oct 2003 15:08:03 GMT
On Mon, 2003-10-20 at 16:30, Geoff Howard wrote:
> Christopher Painter-Wakefield wrote:
> > 
> > 
> > 
> > This documentation is a bit out of date, I think, although it is a minor
> > sin in this case.  Cocoon has its own Request and Response interfaces
> > (looking at the implementors this is perhaps because they also handle the
> > command line interactions, not just the servlet interfactions).  Look at
> > the API docs (http://cocoon.apache.org/2.1/apidocs/index.html) for more
> > info.  As it happens, the APIs for these interfaces are the same as
> > HttpServletRequest and HttpServletResponse, so except when you need to
> > declare the type (as in your example), you can use these objects in the
> > same fashion.
> > 
> > Even the API docs are out of date - the comment for HttpResponse still says
> > it implements HttpServletResponse :)
> > 
> > You can declare your constructor to use
> > org.apache.cocoon.environment.Request and ....Response.
> > 
> > -Christopher
> > 
> > 
> > 
> >                                                                                
                                                      
> >                       Gianluca Sartori                                         
                                                      
> >                       <g.sartori@elis.o        To:       users@cocoon.apache.org
                                                     
> >                       rg>                      cc:                          
                                                         
> >                                                Subject:  request & response
objects                                                   
> >                       10/20/2003 09:35                                         
                                                      
> >                       AM                                                       
                                                      
> >                       Please respond to                                        
                                                      
> >                       users                                                    
                                                      
> >                                                                                
                                                      
> >                                                                                
                                                      
> > 
> > 
> > 
> > 
> > Hi,
> > 
> >              I'm slowly getting into coccon. I read I can use "request" and
> > "response" objects in XSP pages from my Java code. The official
> > documentation says these objects are instances of
> > HTTPServletRequest/Response, but is it really true?
> > 
> > I'm instantiating an object whose constructor accepts two arguments as
> > follow:
> > 
> > public TheClass (HttpServletRequest request, HttpServletResponse
> > response)
> > 
> > When I try to instantiate an object out of this class cocoon ends up
> > with an error complaining about an undefined constructor. Here is how I
> > instantiated the object:
> > 
> > <?xml version="1.0" encoding="UTF-8"?>
> > <xsp:page xmlns:xsp="http://apache.org/xsp">
> > <xsp:structure>
> > <xsp:include>org.mysite.*</xsp:include>
> > </xsp:structure>
> > 
> > <my-root-element>
> > <xsp:expr>new TheClass(request, response)</xsp:expr>
> > [...]
> > 
> > 
> > This gets translated into the following code:
> > 
> > [...]
> > XSPObjectHelper.xspExpr(contentHandler, new WASClient(request,
> > response));
> > [...]
> > 
> > And the error returned by cocoon is:
> > 
> > org.apache.cocoon.components.language.LanguageException: Error compiling
> > test_xsp: ERROR 1
> > (org/apache/cocoon/www/projects/was/docs/test_xsp.java): ...
> > this.characters("\n\n"); // start error (lines 104-104) "The constructor
> > WASClient(Request, Response) is undefined"
> > XSPObjectHelper.xspExpr(contentHandler, new WASClient(request,
> > response)); // end error this.characters("\n\n"); ... Line 104, column
> > 0: The constructor WASClient(Request, Response) is undefined
> > 
> > A comment into the generated code makes me think about the correctness
> > of the documentation, here it is:
> > 
> >         /* Built-in parameters available for use */
> >         // context    - org.apache.cocoon.environment.Context
> >         // request    - org.apache.cocoon.environment.Request
> >         // response   - org.apache.cocoon.environment.Response
> > 
> > So, what should I do to make my Object working? I'm using
> > HTTPServletRequest/Response ad, to say the thruth, I'm not so happy
> > changing them to be used in coccon. Anyway, if you tell me this is the
> > only way to go...
> 
> I seem to think there was some discussion about allowing the real 
> HTTPServletRequest (held as a private member in the http impl of the 
> abstract o.a.c.environment.Request) to be accessible.  You may want to 
> check the dev list archives for references to this.  I don't think it 
> was implemented but you could check that too.

Actually this has been in Cocoon for a long time (probably always) and
there are quite a few components that use it. For example, the following
code is from the JSPGenerator:

HttpServletResponse httpResponse =        
(HttpServletResponse)this.objectModel.get(HttpEnvironment.HTTP_RESPONSE_OBJECT);
HttpServletRequest httpRequest =
(HttpServletRequest)this.objectModel.get(HttpEnvironment.HTTP_REQUEST_OBJECT);
ServletContext httpContext =
(ServletContext)this.objectModel.get(HttpEnvironment.HTTP_SERVLET_CONTEXT);

-- 
Bruno Dumon                             http://outerthought.org/
Outerthought - Open Source, Java & XML Competence Support Center
bruno@outerthought.org                          bruno@apache.org


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