Dependency between TreeNode type and tree2 facet name should be loosened, to
enable rendering of generic trees
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Key: MYFACES-890
URL: http://issues.apache.org/jira/browse/MYFACES-890
Project: MyFaces
Type: Wish
Components: Tomahawk
Versions: 1.1.0
Reporter: Erik Dybdahl
Priority: Minor
If, during rendering of a tree2, a node is found whose type does not correspond
to the name of a facet under the tree2 widget, this error results:
javax.faces.FacesException: org.apache.jasper.JasperException: Unable to locate
facet with the name: <value of TreeNode.getType()>
at
com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:327)
at
com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
at
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
(this will also be the result if the value of som type is changed and cookies
are retained between renderings, a fact that is described in other bug issues).
To a certain extent a view component has to know what the model look like, but
the coupling should be as loose as possible.
For the tree2 widget, the use of string values to specify how a certain
TreeNode type should be rendered, creates a somewhat too tight coupling.
A more generic approach would be to use the type of the node itself (the class)
to determine how the node be rendered, provide a default rendering for
TreeNodeBase, and enable more specfic rendering via references in the view to
custom implementations of TreeNode.
Sorry if this issue has been discussed earlier. I've just started using myFaces.
Regards,
Erik
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