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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
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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
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 */

// HiddenRenderer.java

package com.sun.faces.renderkit.html_basic;

import java.io.IOException;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.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 

} // end of class HiddenRenderer