UIAddComponent2.java

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package com.sun.faces.event;

import javax.faces.application.FacesMessage;
import javax.faces.component.FacesComponent;
import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.component.UIViewRoot;
import javax.faces.component.html.HtmlOutputText;
import javax.faces.component.html.HtmlPanelGrid;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PostAddToViewEvent;
import javax.faces.event.PreRenderViewEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.SystemEventListener;

@FacesComponent( value = "com.sun.faces.event.UIAddComponent2" )
public class UIAddComponent2
    extends UIComponentBase
    implements SystemEventListener {

    //
    // Constructor
    //

    public UIAddComponent2() {

        setRendererType( "testcomponent" );

        FacesContext context = FacesContext.getCurrentInstance();
            UIViewRoot root = context.getViewRoot();

            root.subscribeToViewEvent( PreRenderViewEvent.class, this );
            root.subscribeToViewEvent( PostAddToViewEvent.class, this );
    }

    //
    // Public methods
    //

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

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

    @Override
    public void processEvent( SystemEvent event )
        throws AbortProcessingException {
        FacesContext context = FacesContext.getCurrentInstance();
        context.addMessage(getId(),
            new FacesMessage(FacesMessage.SEVERITY_ERROR,
                getId() + " : Event: " + event, null));
    }
}