Recursive nesting of Facelet Composite Components

Question

I use JSF2.0 Facelets and Composite Components. I want to display a hierarchical questionary, where the questionary contains a Category List, and any Category can contains subCategories and Questions. In fact, Category inherits from abstract Question class, and we have also some other non-abstarct Question class, like IntQuestion, BooleQuestion, etc.
I defined a Composite Component for Category:
    <!-- INTERFACE -->
    <cc:interface>
        <cc:attribute name="category"/>
    </cc:interface>
    <!-- IMPLEMENTATION -->
    <cc:implementation>
        <h3><h:outputText value="#{category.label} " /></h3>
        <ui:repeat value="#{category.subCategories}" var="subcat">
            <h:panelGroup rendered="#{cc.attrs.category.type == 'Category'}">
                    <ez:category category="${subcat}" />
            </h:panelGroup>
            <h:panelGroup rendered="#{cc.attrs.category.type == 'IntQuestion'}">
                <h:outputText value="#{cc.attrs.category.label} " />
                <h:inputText value="#{myBean.answersByQuestion[cc.attrs.category].answer}" />
            </h:panelGroup>
            <!--More types of Questions-->
        </ui:repeat>
    </cc:implementation>So my Questionary Page would be very short:
                <ui:repeat value="#{myBean.questionary.categories}" var="cat">
                    <ez:category category="${cat}" />
                </ui:repeat>But unfortunately nested composite components are put together before EL-expressions sre resolved, so we get an infinite loop (StackOverflow).
Do you have some idea to correct this composition?
Edited by: GezaCH on Jul 28, 2010 3:28 PM

Answer 1

I wrote something like that about a year ago, and it wasn't hard, and didn't take long time, so you should be able to write code for that in less than an hour if you know about reflection.
Kaj