[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-2289) Provide no-arg constructor for SeamExpressionFactory

Pete Muir (JIRA) jira-events at lists.jboss.org
Tue Mar 11 16:13:59 EDT 2008

    [ http://jira.jboss.com/jira/browse/JBSEAM-2289?page=comments#action_12402241 ] 
Pete Muir commented on JBSEAM-2289:

I don't see why you need to install SeamExpressionFactory in a ViewHandler?

> Provide no-arg constructor for SeamExpressionFactory
> ----------------------------------------------------
>                 Key: JBSEAM-2289
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2289
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: EL
>    Affects Versions: 2.0.0.GA
>            Reporter: Florent Guilllaume
>            Priority: Minor
> I'd like a public no-arg constructor to SeamExpressionFactory:
>     public SeamExpressionFactory() {
>         super(INSTANCE);
>     }
> The reason is that I want a facelet view handler extending FaceletViewHandler with the Seam expression factory. To do that I would use:
>     @Override
>     protected Compiler createCompiler() {
>         Compiler compiler = super.createCompiler();
>         compiler.setFeature(Compiler.EXPRESSION_FACTORY, "org.jboss.seam.el.SeamExpressionFactory");
>         return compiler;
>     }
> But a Compiler.EXPRESSION_FACTORY expects a class with a no-arg constructor (see com.sun.facelets.compiler.Compiler#createExpressionFactory and #featureInstance).
> As a workaround I can use my own subclass of SeamExpressionFactory but the super constructor     SeamExpressionFactory(ExpressionFactory expressionFactory), which I need to call, is package-private. So I have to use the package org.jboss.seam.el just to call that constructor, which is not nice.
> Just having a no-arg constructor would simplify all this.

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