AspectJ provided around advice might help you :)
with AOP you could instrument any classes and inject custom code quite
cleanly.
John Smith <[EMAIL PROTECTED]> wrote: I could but then I would have to change
all the code to use that extended
class. Like for PageLink, everything now would have to use MyCustomPageLink.
Or I would have to crack open the tapestry.jar and change the component
class of PageLink to MyCustomPageLink.
----Original Message Follows----
From: "Patrick Casey"
Reply-To: "Tapestry users"
To: "'Tapestry users'" ,
Subject: RE: How to add logic for all components that render
Date: Fri, 30 Dec 2005 11:48:41 -0800
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Couldn't you just override the component's renderBody method? And
then do something like:
Public void renderBody(IRequestCycle cycle) {
If (foo)
Super.renderBody(cycle);
}
--- Pat
> -----Original Message-----
> From: John Smith [mailto:[EMAIL PROTECTED]
> Sent: Friday, December 30, 2005 10:51 AM
> To: tapestry-user@jakarta.apache.org
> Subject: How to add logic for all components that render
>
> I am trying to find a way to provide a hook into everything that renders.
> I
> want to integrate some business rules into Tapestry so that I can turn
off
> the rendering of some components if some condition is true. For example,
> if
> you are not part of the admin group then the "Delete User" button doesn't
> render.
>
> I realize I could use Conditional components around the things that I may
> want to prevent rendering, but I would have to use tons of Conditionals
> and
> properties just to control whether something should render. I also want
> this
> "dynamic rendering turning off switch" to be behind the scenes. I don't
> really want the page desinger to have to always provide ways to turn off
> rendering.
>
> I have tried using enhancement workers, but I can only append logic to
the
> render method, not override it. I have also tried using an enhancement
> worker to replace the render method, but then I lose all the
> previous-existing rendering logic.
>
> I tried extending BasePage, and I can get an inspect all the components,
> but
> there's no way for me to tell them not to render themselves.
>
> Since all the components implement render, but they all extend from
> different classes, and because the classes are always enhanced (so I
don't
> know what logic there actually is in the render method for any given
> component), I can't just write new render methods for the components.
>
> I have looked into overriding the page service or creating a different
> IMarkupWriter, but that seems awfully severe just to control whether a
> component should render itself or not.
>
> I have thought about writing extended versions of all the components
(like
> a
> RulesPageLink, etc), but that's a lot of components and the page desginer
> would always have to use these new components.
>
> Without being majorly intrusive into tapestry or hivement I don't know of
> any other way other than using tons of Conditionals. Anyone have any
> ideas?
>
> Greatly appreciated.
>
>
>
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Konstantin Ignatyev
PS: If this is a typical day on planet earth, humans will add fifteen million
tons of carbon to the atmosphere, destroy 115 square miles of tropical
rainforest, create seventy-two miles of desert, eliminate between forty to one
hundred species, erode seventy-one million tons of topsoil, add 2,700 tons of
CFCs to the stratosphere, and increase their population by 263,000
Bowers, C.A. The Culture of Denial: Why the Environmental Movement Needs a
Strategy for Reforming Universities and Public Schools. New York: State
University of New York Press, 1997: (4) (5) (p.206)
