[jsr-314-open] [NEW - MR] Add ExpressionFactory to "11.4.6 Delegating Implementation Support"

[Kito Mann]

+1
---
Kito D. Mann -- Author, JavaServer Faces in Action
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On Tue, Jul 28, 2009 at 9:00 AM, Pete Muir <pmuir at redhat.com> wrote:

> Hi all,
>
> I would like to propose adding ExpressionFactory to the list of classes
> required to support the decorator pattern. This is to aid integration with
> CDI (JSR-299) implementations, which are require a callback when EL
> expression evaluation completes; the necessary hook into EL is via the
> ExpressionFactory. Adding ExpressionFactory to this list would make
> implemetors have to jump through fewer hoops to obtain the callback [1].
>
> I propose this change to the MR so it can be used in the EE6 platform, the
> target for JSR-299.
>
> Changes to spec required
> -----------------------------------
>
> * Add ExpressionFactory to the list of classes required to support the
> decorator pattern
> * Add ExpressionFactoryWrapper class to support the decorator pattern
>
> Changes to implementation required
> --------------------------------------------------
>
> * Add support for exposing and using wrapped ExpressionFactory
>
> Impact on users and frameworks
> --------------------------------------------
>
> Users can now:
>
> * call application.setExpressionFactory(new
> WebBeansExpressionFactory(application.getExpressionFactory());
> * configure a wrapping expression factory in faces-config.xml
>   <application>
>
>  <expressionFactory>org.jboss.webbeans.el.WebBeansExpressionFactory</expressionFactory>
>   </application>
>
> [1] Currently this is possible by wrapping the application via the
> application factory and overriding the getExpressionFactory method
>
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