/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation", "Tapestry" 
 *    must not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache" 
 *    or "Tapestry", nor may "Apache" or "Tapestry" appear in their 
 *    name, without prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE TAPESTRY CONTRIBUTOR COMMUNITY
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.tapestry.form;

import java.io.IOException;

import org.apache.tapestry.ApplicationRuntimeException;
import org.apache.tapestry.IActionListener;
import org.apache.tapestry.IBinding;
import org.apache.tapestry.IForm;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.util.io.DataSqueezer;

/**
 *  Implements a hidden field within a {@link Form}.
 *
 *  [<a href="../../../../../ComponentReference/Hidden.html">Component Reference</a>]
 *
 *  @author Howard Lewis Ship
 *  @version $Id$
 * 
 **/

public abstract class Hidden extends AbstractFormComponent
{

    protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
    {
        IForm form = getForm(cycle);
        boolean formRewound = form.isRewinding();

        String name = form.getElementId(this);

        // If the form containing the Hidden isn't rewound, then render.

        if (!formRewound)
        {
            // Optimiziation: if the page is rewinding (some other action or
            // form was submitted), then don't bother rendering.

            if (cycle.isRewinding())
                return;

            String externalValue = null;

            if (getEncode())
            {
                Object value = getValueBinding().getObject();

                try
                {
                    externalValue = getDataSqueezer().squeeze(value);
                }
                catch (IOException ex)
                {
                    throw new ApplicationRuntimeException(this, ex);
                }
            }
            else
                externalValue = (String) getValueBinding().getObject("value", String.class);

            writer.beginEmpty("input");
            writer.attribute("type", "hidden");
            writer.attribute("name", name);
            writer.attribute("value", externalValue);

            return;
        }

        String externalValue = cycle.getRequestContext().getParameter(name);
        Object value = null;

        if (getEncode())
        {
            try
            {
                value = getDataSqueezer().unsqueeze(externalValue);
            }
            catch (IOException ex)
            {
                throw new ApplicationRuntimeException(this, ex);
            }
        }
        else
            value = externalValue;

        // A listener is not always necessary ... it's easy to code
        // the synchronization as a side-effect of the accessor method.

        getValueBinding().setObject(value);

        IActionListener listener = getListener();

        if (listener != null)
            listener.actionTriggered(this, cycle);
    }

    /** @since 2.2 **/

    private DataSqueezer getDataSqueezer()
    {
        return getPage().getEngine().getDataSqueezer();
    }

    public abstract IActionListener getListener();

    public abstract IBinding getValueBinding();

    /**
     * 
     *  Returns false.  Hidden components are never disabled.
     * 
     *  @since 2.2
     * 
     **/

    public boolean isDisabled()
    {
        return false;
    }

    /** 
     * 
     *  Returns true if the compent encodes object values using a
     *  {@link org.apache.tapestry.util.io.DataSqueezer}, false
     *  if values are always Strings.
     * 
     *  @since 2.2
     * 
     **/

    public abstract boolean getEncode();

}
@@ -6056,10 +6056,119 @@
 code();%0A
+    %0A    public abstract void setEncode(boolean encode);%0A%0A%0A%09public void finishLoad()%0A%09%7B%0A%09%09setEncode(true);%0A%09%7D
 %0A%7D

Change default fo Hidden to encode value (using DataSqueezer).