/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.request.target.basic;

import org.apache.wicket.IRequestTarget;
import org.apache.wicket.RequestCycle;

/**
 * The empty AJAX request target does output an empty AJAX response.
 * 
 * @author Matej Knopp
 */
public final class EmptyAjaxRequestTarget implements IRequestTarget
{
	/** immutable hashcode. */
	private static final int HASH = 17 * 1542323;

	/** singleton instance. */
	private static final EmptyAjaxRequestTarget instance = new EmptyAjaxRequestTarget();

	/**
	 * Construct.
	 */
	private EmptyAjaxRequestTarget()
	{
	}

	/**
	 * Gets the singleton instance.
	 * 
	 * @return the singleton instance
	 */
	public static final EmptyAjaxRequestTarget getInstance()
	{
		return instance;
	}

	/**
	 * @see org.apache.wicket.IRequestTarget#respond(org.apache.wicket.RequestCycle)
	 */
	public void respond(RequestCycle requestCycle)
	{
		requestCycle.getResponse().write("<ajax-response></ajax-response>");
	}

	/**
	 * @see org.apache.wicket.IRequestTarget#detach(org.apache.wicket.RequestCycle)
	 */
	public void detach(RequestCycle requestCycle)
	{
	}

	/**
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object obj)
	{
		if (obj instanceof EmptyAjaxRequestTarget)
		{
			return true;
		}
		return false;
	}

	/**
	 * @see java.lang.Object#hashCode()
	 */
	@Override
	public int hashCode()
	{
		return HASH;
	}

	/**
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString()
	{
		return "EmptyAjaxRequestTarget";
	}
}

@@ -845,16 +845,54 @@
 basic;%0A%0A
+import org.apache.wicket.Application;%0A
 import o
@@ -962,16 +962,68 @@
 stCycle;
+%0Aimport org.apache.wicket.protocol.http.WebResponse;
 %0A%0A/**%0A *
@@ -1763,42 +1763,664 @@
 %7B%0A%09%09
-requestCycle.getResponse().write(%22
+WebResponse response = (WebResponse)requestCycle.getResponse();%0A%09%09final String encoding = Application.get()%0A%09%09%09.getRequestCycleSettings()%0A%09%09%09.getResponseRequestEncoding();%0A%0A%09%09// Set content type based on markup type for page%0A%09%09response.setCharacterEncoding(encoding);%0A%09%09response.setContentType(%22text/xml; charset=%22 + encoding);%0A%0A%09%09// Make sure it is not cached by a client%0A%09%09response.setDateHeader(%22Expires%22, System.currentTimeMillis());%0A%09%09response.setHeader(%22Cache-Control%22, %22no-cache, must-revalidate%22);%0A%09%09response.setHeader(%22Pragma%22, %22no-cache%22);%0A%0A%09%09response.write(%22%3C?xml version=%5C%221.0%5C%22 encoding=%5C%22%22);%0A%09%09response.write(encoding);%0A%09%09response.write(%22%5C%22?%3E
 %3Caja

set the right response headers/encoding even when sending a empty response, IE cant parse it otherwise