RecursiveComponent.java

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package com.sun.faces.test.servlet30.dynamic;

import javax.faces.component.FacesComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.component.UIViewRoot;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PreRenderViewEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.SystemEventListener;

@FacesComponent( value = "com.sun.faces.test.servlet30.dynamic.RecursiveComponent" )
public class RecursiveComponent extends UIComponentBase implements SystemEventListener {

    //
    // Constructor - subscribes to PreRenderViewEvent(s)
    //

    public RecursiveComponent() {
        setRendererType( "component" );
        FacesContext context = FacesContext.getCurrentInstance();
        UIViewRoot root = context.getViewRoot();
        root.subscribeToViewEvent( PreRenderViewEvent.class, this );
    }

    //
    // Public methods
    //

    @Override
    public String getFamily() {
        return "com.sun.faces.test.servlet30.dynamic";
    }

    public boolean isListenerForSource( Object source ) {
        return ( source instanceof UIViewRoot );
    }

    // This event method will add a new nested component for pre-render event.

    @Override
    public void processEvent( SystemEvent event )
        throws AbortProcessingException {
        if ( !FacesContext.getCurrentInstance().isPostback() ) {
            HtmlOutputText component = new HtmlOutputText();
            component.setValue( "Dynamically added child" );
            getChildren().add( component );
            if ( !( getParent() instanceof RecursiveComponent ) ) {
                getChildren().add( new RecursiveComponent() );
            }
        }
    }
}