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

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