Primefaces 4, dynamic menu setCommand method - jsf

Question

I'm trying primefaces 4 but there are no documentation around for the new MenuModel. Here, Optimus Prime wrote about the new menu system with a little example.
http://blog.primefaces.org/?p=2594
At this point, he wrote about a setCommand method:
This point to a save method (found in the pf4 showcase: http://www.primefaces.org/showcase/ui/menu/menu.xhtml):
After this introduction, here's the question/problem. I'm creating a dynamic menu from a bean but I don't understand how know the menu clicked by the user and do the right operation.
public void init() {
if (spBean == null) {
System.out.println("spBean is NULL!");
return;
}
for (ServiceProvider sp: spBean.getListaSP()) {
DefaultMenuItem item = new DefaultMenuItem(sp.getNome());
//item.setUrl("#");
item.setIcon("images/sps/" + sp.getImageId() + ".png");
item.setCommand("#{dockMenuBackingBean.setNewMenu}");
//
model.addElement(item);
System.out.println(sp.getNome());
}
}
public void setNewMenu() {
System.out.println("A menu was clicked BUT witch menu? Arghh!!");
//
}
What I want to do, is to change the spSelected in ServiceProviderBackingBean, like I've done in PF3.5:
<p:dock>
<c:forEach items="#{serviceProvidersBean.sps}" var="sp">
<p:menuitem
value="#{sp.spInstanceName}"
icon="/images/sps/#{sp.spInstanceId}.png"
update=":form:spDetail" >
<f:setPropertyActionListener
value="#{sp}"
target="#{serviceProvidersBean.spSelected}" />
</p:menuitem>
</c:forEach>
</p:dock>
Any help?
EDIT:
Actually I'm doing this, but I'm looking for a better and cleaner way to achieve this.
public void init() {
if (spBean == null) {
System.out.println("spBean is NULL!");
return;
}
for (ServiceProvider sp: spBean.getListaSP()) {
DefaultMenuItem item = new DefaultMenuItem(sp.getNome());
//item.setUrl("#");
item.setIcon("images/sps/" + sp.getImageId() + ".png");
String command = String.format("#{dockMenuBackingBean.setNewMenu('%d')}", spBean.getListaSP().indexOf(sp));
item.setCommand(command);
//
model.addElement(item);
System.out.println(sp.getNome());
}
}
public void setNewMenu(Object x) {
Integer selectedId = Integer.parseInt((String)x);
System.out.println("Menu changed " + Integer.toString(selectedId));
//
}

Answer 1

Setting command parameters by setParam(key,value) can be done like that:
In your menu generating bean:
DefaultMenuItem item = new DefaultMenuItem("display list");
item.setId("listMenuItem");
item.setCommand("#{myBean.displayList}");
item.setParam("listId", 1l);
In your managed bean containing the action:
public String displayList(ActionEvent event) {
MenuItem menuItem = ((MenuActionEvent) event).getMenuItem();
Long id = Long.parseLong(menuItem.getParams().get("listId").get(0));
findListBy(id);
}
Reading parameters seems to be a bit complicated. But ActionListeners aren't supported by Primefaces 4 MenuItems (because they aren't derived from UICommand any more) so params seem to be new new way.

Answer 2

Optimus here, use setParam(key,value). You need to update to trunk code though for this.