[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2794) Make Seam EL more extensible and unified

[Ryan Gustafson (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBSEAM-2794?page=comments#action_12413443 ] 
            
Ryan Gustafson commented on JBSEAM-2794:
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Compositing with the Seam ELResolver would be useful for making extensions to the property namespace.  In particular, I'd like to add Annotations to my data model POJOs hosted on a Seam component which can be accessed via EL.

For example, I'd like automatic JSF label text using something like:

   <h:outputLabel><h:outputText  value="#{seamComponent.myPojo.aProperty.labelAnnotation}"/></h:outputLabel>

I need to be able to add my resolver into a SeamCompositeELResolver to make 'labelAnnotation' work.


> Make Seam EL more extensible and unified
> ----------------------------------------
>
>                 Key: JBSEAM-2794
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2794
>             Project: Seam
>          Issue Type: Feature Request
>          Components: Core
>    Affects Versions: 2.1.0.A1
>            Reporter: Michael Youngstrom
>         Assigned To: Michael Youngstrom
>             Fix For: 2.1.0.BETA1
>
>         Attachments: el.patch
>
>
> I'm currently having some trouble dealing with ELResolvers in Seam and JSF.
> 1.  It is not very easy to add ELResolvers to Seam (e.g. SpringELResolver must be put in the end of the resolver chain when it should be one of the first.)
> 2.  When executing outside a FacesRequest you have to use the Seam ELResolver infrastructure which doesn't see any of the JSF ELResolvers
> 3. It would be nice to have a little more control over the order of ELResolvers since I have run into a few recursive situations as EL can sometimes sneak it's way into situations where EL is used in the SeamELResolver to resolve EL.
> I believe that all of the above can be solved by:
> 1. Turn the SeamELResolver into a CompositeELResolver where a Seam Component can manage the included ELResolvers.
> 2. Add the above single SeamCompositeELResolver to the faces-context.xml.  Making it so custom ELResolvers can be managed in a single place in Seam for both Faces and non Faces requests.

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