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This is the master POM file for Oracle's Implementation of the JSF 2.0 Specification.
There is a newer version: 2.4.0
/*
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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * Copyright 2005-2007 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package com.sun.faces.facelets;

import javax.el.ELException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.view.facelets.FaceletException;
import java.io.IOException;

/**
 * The parent or root object in a FaceletHandler composition. The Facelet will
 * take care of populating the passed UIComponent parent in relation to the
 * create/restore lifecycle of JSF.
 * 
 * @author Jacob Hookom
 */
public abstract class Facelet {

    /**
     * The passed UIComponent parent will be populated/restored in accordance
     * with the JSF 1.2 specification.
     * 
     * @param facesContext
     *            The current FacesContext (Should be the same as
     *            FacesContext.getInstance())
     * @param parent
     *            The UIComponent to populate in a compositional fashion. In
     *            most cases a Facelet will be base a UIViewRoot.
     * @throws IOException
     * @throws FacesException
     * @throws FaceletException
     * @throws ELException
     */
    public abstract void apply(FacesContext facesContext, UIComponent parent)
    throws IOException;
}