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Wicket is a Java web application framework that takes simplicity, separation of concerns and ease of development to a whole new level. Wicket pages can be mocked up, previewed and later revised using standard WYSIWYG HTML design tools. Dynamic content processing and form handling is all handled in Java code using a first-class component model backed by POJO data beans that can easily be persisted using your favorite technology.

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/*
 * 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;

import org.apache.wicket.request.component.IRequestablePage;
import org.apache.wicket.request.flow.ResetResponseException;
import org.apache.wicket.core.request.handler.IPageProvider;
import org.apache.wicket.core.request.handler.PageProvider;
import org.apache.wicket.core.request.handler.RenderPageRequestHandler;
import org.apache.wicket.core.request.handler.RenderPageRequestHandler.RedirectPolicy;
import org.apache.wicket.request.mapper.parameter.PageParameters;

/**
 * Causes Wicket to interrupt current request processing and immediately respond with the specified
 * page.
 * 
 * @author Igor Vaynberg (ivaynberg)
 * @see NonResettingRestartException
 */
public class RestartResponseException extends ResetResponseException
{
	private static final long serialVersionUID = 1L;

	/**
	 * Redirects to the specified bookmarkable page
	 * 
	 * @param 
	 *            The page type
	 * 
	 * @param pageClass
	 *            class of bookmarkable page
	 */
	public  RestartResponseException(final Class pageClass)
	{
		this(pageClass, null);
	}

	/**
	 * Redirects to the specified bookmarkable page with the given page parameters
	 * 
	 * @param 
	 *            The page type
	 * 
	 * @param pageClass
	 *            class of bookmarkable page
	 * @param params
	 *            bookmarkable page parameters
	 */
	public  RestartResponseException(final Class pageClass,
		final PageParameters params)
	{
		this(new PageProvider(pageClass, params), RedirectPolicy.ALWAYS_REDIRECT);
	}

	/**
	 * Redirects to the specified page
	 * 
	 * @param page
	 *            redirect page
	 */
	public RestartResponseException(final IRequestablePage page)
	{
		this(new PageProvider(makeStateful(page)), RedirectPolicy.AUTO_REDIRECT);
	}

	/**
	 * Redirects to the page provided by the passed {@code pageProvider} using the explicit
	 * {@code redirectPolicy}
	 * 
	 * @param pageProvider
	 *            the provider for the page
	 * @param redirectPolicy
	 *            the redirect policy to use
	 */
	public RestartResponseException(final IPageProvider pageProvider,
		final RedirectPolicy redirectPolicy)
	{
		super(new RenderPageRequestHandler(pageProvider, redirectPolicy));
	}

	/**
	 * Marks the page as stateful so that it is still available after a redirect.
	 * See WICKET-5078 and WICKET-3965
	 *
	 * @param page
	 *      The page to mark stateful
	 * @return The passed page.
	 *
	 */
	private static IRequestablePage makeStateful(IRequestablePage page)
	{
		if (page instanceof Page)
		{
			((Page)page).setStatelessHint(false);
		}
		return page;
	}
}