Preparing for one of the sessions for 2GX I had the need to setup a TreeModel with sample data to feel out the UI, before properly bridging the app to a database source. So there I was browsing the javadocs and code examples thinking that perhaps there was a groovier way to create the model, then I realized that ObjectGraphBuilder would be an ideal solution, which lead me to the following code
def ogb = new ObjectGraphBuilder() ogb.classNameResolver = { name -> "javax.swing.tree.DefaultMutableTreeNode" } ogb.childPropertySetter = { parent, child, pname, cname -> parent.add( child ) } def root = ogb.node( userObject: 'Feeds' ){ node( userObject: 'groovy' ){ node( userObject: 'GroovyZone' ) node( userObject: 'Groovyblogs' ) node( userObject: 'AboutGroovy' ) } node( userObject: 'java' ){ node( userObject: 'Javalobby' ) } node( userObject: 'news' ){ node( userObject: 'Slashdot: news for nerds' ) } } swing.doLater { feeds.model = new DefaultTreeModel( root ) }
I cheated a bit, firstly I tell OGB that any node it will build should be a DefaultMutableTreeNode, no matter what name you choose the resulting object would be an instance of that class. Secondly I modify the default behavior for setting a child node into a parent node, as DefaultMutableTreeNode does not have a 'setNode()' method (or setXyz() if I choose that as node name). Once the model is created it is assigned to a JXTree giving the following result



Keep on Groovying!