RE: Re: JSF Component Question

From: Jason Lee <>
Date: Thu, 14 Dec 2006 13:37:31 -0600

Hmm. For now, it's using the Swing class, but I think I may create some
Java classes that mimic, in terms of nomenclature, the classes supported
by the JS component:
A TreeNode would be able to hold 0 or more TreeNode elements for nested
levels. This hierarchy would help me identify at render time what type
of node in the JS i need to create for the given TreeNode on the Java
Anyone see any problems with that?
Jason Lee, SCJP
Programmer/Analyst <>


        From: Ken.Paulsen_at_Sun.COM [mailto:Ken.Paulsen_at_Sun.COM]
        Sent: Wednesday, December 13, 2006 6:03 PM
        Subject: Re: JSF Component Question

        Hi Jason,
        I have had the privilege of writing a JSF tree component and
faced the same issue. There's more than one right approach (or is that
more than one wrong approach?). But I can share what I did.
        On the component side, I composed the Tree of multiple
UIComponents. I defined 2 types of components:
        From an implementation point-of-view, I ended up having Tree
extend TreeNode b/c the root node (represented by Tree) was just a
specialized TreeNode. You could then easily build a tree staticly in a
JSP, Facelets xhtml, or JSFTemplating .jsf file. However, this doesn't
(didn't) address the root of your question.
        So... on the "data" side, here's what I did. I defined a
factory class for instantiating part of a Tree structure as described
above (or the entire structure if you want). The factory class required
a "TreeAdaptor" implementation. TreeAdaptor" was an interface that
exposed methods for walking a tree structure that that factory would
call. The interface also exposed methods for getting meta data needed
for the UIComponent (image urls, hyperlink, facets, etc.). The
TreeAdaptor implementations could be written to accept any type of data
structure (i.e. swing TreeNode). This allowed me to walk existing tree
structures and "adapt" them to the UIComponent tree structure required
to represent them in JSF.
        You can see the code here:
        And for impl. of the TreeAdaptor inteface:
        I don't know if this type of approach is what you're looking for
or not... but I thought I'd share how I dealt with it.
        Good luck!
        Ken Paulsen
        Jason Lee wrote:

                I'm trying to write a JSF component wrapper for the YUI
tree component. My first thought on how to represent the tree's data to
the component, based on discussions I've overheard around the office is
TreeNode, with which I have no experience. I quickly discovered that
that interface's package is javax.swing.tree. My gut reaction is that
it seems a little odd to have a JSF component using a Swing interface
for its data model, but I see no better, existing interface/class with
which to model my tree's data. Another option is to design a custom
class for just this purpose. Anyone have any thoughts? For now, I'll
probably keep plodding along with TreeNode and see what happens in the
interim. :)
                Jason Lee, SCJP

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