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Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.renderkit.html_basic;

import com.sun.faces.util.Util;

import java.io.IOException;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.render.Renderer;

/**
 * 
 * This Renderer is responsible for rendering the children
 * defined within the composite implementation section of a composite component
 * template.
 * 
 */
public class CompositeRenderer extends Renderer {


    // --------------------------------------------------- Methods from Renderer


    @Override
    public void encodeChildren(FacesContext context, UIComponent component) throws IOException {

        Util.notNull("context", context);
        Util.notNull("component", component);

        Map facets = component.getFacets();
        UIComponent compositeRoot = facets.get(UIComponent.COMPOSITE_FACET_NAME);
        if (null == compositeRoot) {
            throw new IOException("PENDING_I18N: Unable to find composite " + 
                    " component root for composite component with id " + 
                    component.getId() + " and class " + 
                    component.getClass().getName());
        }
        compositeRoot.encodeAll(context);

    }


    @Override
    public boolean getRendersChildren() {
        return true;
    }


}