HiddenRenderer.java

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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;

/**
 * <B>HiddenRenderer</B> is a class that renders the current value of
 * <code>UIInput<code> 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