All,
I have been trying to reflect changes on the tree
after an action occurs in an action form. In my
scenario, I am adding a node to the tree.
My front uses the tree / tree table tags.
<h:form name="roleSelectManyCheckboxForm">
<x:selectManyCheckbox id="roleSelectManyCheckbox"
value="#{roleActionForm.selectedRoles}"
layout="spread" />
<x:tree id="tree"
value="#{roleTreeTable.treeModel}"
var="roleTreeItem"
styleClass="tree"
nodeClass="tree-node"
headerClass="portlet-table-header"
footerClass="portlet-table-footer"
rowClasses="portlet-table-row1,
portlet-table-row2"
columnClasses="portlet-table-col1,
portlet-table-col2"
selectedNodeClass="tree-node-selected"
expandRoot="true">
<h:column>
<f:facet name="header">
<h:outputText
value="#{roleMgtMessages['selectHeader']}" />
</f:facet>
<x:treeCheckbox for="roleSelectManyCheckbox"
itemValue="#{roleTreeItem.fullPath}" />
</h:column>
<x:treeColumn>
<f:facet name="header">
<h:outputText
value="#{roleMgtMessages['roleHierarchy']}" />
</f:facet>
<h:commandLink action="none">
<h:outputText value="#{roleTreeItem.roleName}"
/>
<f:param name="addRoleToParam"
value="#{roleTreeItem.fullPath}"/>
<f:actionListener
type="org.apache.jetspeed.portlets.security.rolemgt.AddRoleCommandLinkActionListener"
/>
</h:commandLink>
</x:treeColumn>
Upon click on the commandLink, the event is
intercepted by AddRoleCommandLinkActionListener which
in processAction set the node to add an element to and
present a form to do so. In the new form, upon adding
an element to the node, a RoleActionForm is invoked
that adds the provided element to the selected node
element.
Until now, everything work well, I now resolve the
tree table with the intent of refreshing the tree
model. I have been stuck on this since.
// Resolve the tree table.
FacesContext facesContext =
FacesContext.getCurrentInstance();
VariableResolver vr =
facesContext.getApplication().getVariableResolver();
RoleTreeTable roleTree = (RoleTreeTable)
vr.resolveVariable(facesContext,
RoleTreeTable.ROLE_TREE_TABLE);
roleTree.setTreeModel(SecurityApplicationUtils.buildRoleTreeModel());
roleTree.getTreeModel().nodeStructureChanged(SecurityApplicationUtils.findTreeNode(roleTree,
getParentRole().getFullPath()));
I don't understand how any of the DefaultTreeModel
change method are supposed to work. The
nodeStructureChanged is invoked properly in this case
but starts with a check for:
if (listeners.isEmpty())
{
// nobody cares
return;
}
where listeners is always empty.
I feel like I am missing something basic here. How do
listeners get added to the DefaultTreeModel? The
DefaultTreeModel seem to have everything necessary to
trigger tree changes, if only I could figure out what
is the hook with the listeners.
I am looking forward to your input.
Regards,
David Le Strat.
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