Hi,
I was playing with JSF2 behaviors and I wrote a new behavior (not
ClientBehavior). Problem I described here doesn't seem like a impl bug,
instead it seems like a missing thing in the spec to me.
Let me explain my structure first. I have two abstract stuff in
Behavior-side:
- "ByPassAttributeBehavior"
@FacesBehavior(value = "org.apache.myfaces.html5.ByPassAttributeBehavior")
public class ByPassAttributeBehavior extends *BehaviorBase*
....
- "ByPassAttributeBehaviorHolder" (which does not extend anything. it
would extend "BehaviorHolder", if it was existed)
public interface ByPassAttributeBehaviorHolder
....
And implementing component side (please note that I am using MyFaces builder
plugin):
- "AbstractByPassTestComponent"
@JSFComponent(name = "hx:bypassTest",
clazz = "tr.com.aliok.html5.bypassbehavior.BypassTestComponent",
tagClass = "tr.com.aliok.html5.component.ByPassTestTag")
public abstract class AbstractByPassTestComponent extends UIComponentBase
implements *ByPassAttributeBehaviorHolder*
{...
- "ByPassTestRenderer"
@JSFRenderer(
renderKitId = "HTML_BASIC",
family = "tr.com.aliok.html5.ByPassTest",
type = "tr.com.aliok.html5.ByPassTest")
public class ByPassTestRenderer extends Renderer
{...
Registration in ...taglib.xml:
<tag>
<tag-name>byPassAttributeBehavior</tag-name>
<behavior>
<behavior-id>org.apache.myfaces.html5.ByPassAttributeBehavior</behavior-id>
</behavior>
</tag>
At last, my usage:
<hx:bypassTest ...>
<hx:byPassAttributeBehavior .../>
</hx:bypassTest>
In this case, at
org.apache.myfaces.view.facelets.tag.jsf.BehaviorTagHandlerDelegate#apply,
an exception is thrown if the parent is not a ClientBehaviorHolder or a
composite component.
...
I think I can solve this problem by writing a tag handler, but why not
supporting this feature without a tag handler just like ClientBehaviors?
We don't have to write tag handlers for "ClientBehavior"s, but this is not
the case for "Behavior"s. Seems like the problem is: there is no interface
like "BehaviorHolder". Thus the delegate BehaviorTagHandlerDelegate cannot
determine whether the parent is Behavior 'attachable', so it cannot attach
Behaviors to parent.
However, I couldn't understand why there is no interface like BehaviorHolder
and why we need to write a tag handler for a "Behavior" that doesn't extend
"ClientBehavior"? If something similar is discussed before, what was the
purpose of this decision?
I see that, we have "addClientBehavior" method in "ClientBehaviorHolder"
class. Behaviors are here to get attached, right? So, why this attaching
logic only pushed for 'ClientBehavior's?
Regards,
Ali
--
My Blog: http://blog.aliok.com.tr
Twitter: http://twitter.com/aliok_tr
