appserver/tests/v2-tests/appserv-tests/sqetests/jsfcomponents/src/components/renderkit/StylesheetRenderer.java

/*
 * Copyright (c) 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
 */

/*
 * $Id: StylesheetRenderer.java,v 1.3 2004/11/14 07:33:15 tcfujii Exp $
 */

package components.renderkit;


import jakarta.faces.component.UIComponent;
import jakarta.faces.component.UIOutput;
import jakarta.faces.context.FacesContext;
import jakarta.faces.context.ResponseWriter;

import java.io.IOException;


/**
 * <p>Render a stylesheet link for the value of our component's
 * <code>path</code> attribute, prefixed by the context path of this
 * web application.</p>
 */

public class StylesheetRenderer extends BaseRenderer {


    public boolean supportsComponentType(UIComponent component) {
        return (component instanceof UIOutput);
    }


    public void decode(FacesContext context, UIComponent component) {
    }


    public void encodeBegin(FacesContext context, UIComponent component)
        throws IOException {
        ;
    }


    public void encodeChildren(FacesContext context, UIComponent component)
        throws IOException {
        ;
    }


    /**
     * <p>Render a relative HTML <code>&lt;link&gt;</code> element for a
     * <code>text/css</code> stylesheet at the specified context-relative
     * path.</p>
     *
     * @param context   FacesContext for the request we are processing
     * @param component UIComponent to be rendered
     *
     * @throws IOException          if an input/output error occurs while rendering
     * @throws NullPointerException if <code>context</code>
     *                              or <code>component</code> is null
     */
    public void encodeEnd(FacesContext context, UIComponent component)
        throws IOException {

        if ((context == null) || (component == null)) {
            throw new NullPointerException();
        }

        ResponseWriter writer = context.getResponseWriter();
        String contextPath = context.getExternalContext()
            .getRequestContextPath();
        writer.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"");

        writer.write(contextPath);
        writer.write((String) component.getAttributes().get("path"));
        writer.write("\">");

    }


}