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EE4J Compatible Implementation for Jakarta Faces API

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/*
 * Copyright (c) 1997, 2020 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
 */

// HiddenRenderer.java

package com.sun.faces.renderkit.html_basic;

import java.io.IOException;

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

/**
 * HiddenRenderer is a class that renders the current value of UIInput component as a HTML hidden
 * variable.
 */
public class HiddenRenderer extends HtmlBasicInputRenderer {

    // ---------------------------------------------------------- Public Methods

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

    // ------------------------------------------------------- Protected Methods

    @Override
    protected void getEndTextToRender(FacesContext context, UIComponent component, String currentValue) throws IOException {
        ResponseWriter writer = context.getResponseWriter();
        assert writer != null;

        writer.startElement("input", component);
        writeIdAttributeIfNecessary(context, writer, component);
        writer.writeAttribute("type", "hidden", "type");
        String clientId = component.getClientId(context);
        writer.writeAttribute("name", clientId, "clientId");

        // render default text specified
        if (currentValue != null) {
            writer.writeAttribute("value", currentValue, "value");
        }
        writer.endElement("input");

    }

    // The testcase for this class is TestRenderers_3.java

}