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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 java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.wicket.request.IRequestHandler;
import org.apache.wicket.request.IRequestMapper;
import org.apache.wicket.request.IWritableRequestParameters;
import org.apache.wicket.request.Request;
import org.apache.wicket.request.Url;
import org.apache.wicket.request.Url.QueryParameter;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.flow.ResetResponseException;
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.http.WebRequest;
import org.apache.wicket.request.mapper.parameter.PageParameters;
import org.apache.wicket.util.string.StringValue;

/**
 * Causes Wicket to interrupt current request processing and immediately redirect to an intercept
 * page.
 */
public class RestartResponseAtInterceptPageException extends ResetResponseException
{
	private static final long serialVersionUID = 1L;

	/**
	 * Redirects to the specified {@code interceptPage}.
	 * 
	 * @param interceptPage
	 */
	public RestartResponseAtInterceptPageException(Page interceptPage)
	{
		super(new RenderPageRequestHandler(new PageProvider(interceptPage),
			RedirectPolicy.AUTO_REDIRECT));
		InterceptData.set();
	}

	/**
	 * Redirects to the specified intercept page, this will result in a bookmarkable redirect.
	 * 
	 * @param interceptPageClass
	 */
	public RestartResponseAtInterceptPageException(Class interceptPageClass)
	{
		this(interceptPageClass, null);
	}

	/**
	 * Redirects to the specified intercept page, this will result in a bookmarkable redirect.
	 * 
	 * @param interceptPageClass
	 * @param parameters
	 */
	public RestartResponseAtInterceptPageException(Class interceptPageClass,
		PageParameters parameters)
	{
		super(new RenderPageRequestHandler(new PageProvider(interceptPageClass, parameters),
			RedirectPolicy.ALWAYS_REDIRECT));
		InterceptData.set();
	}

	/**
	 * @return the url of the request when the interception happened or {@code null}
	 * or {@code null} if there was no interception yet
	 */
	public static Url getOriginalUrl()
	{
		Url originalUrl = null;
		InterceptData data = InterceptData.get();
		if (data != null)
		{
			originalUrl = data.getOriginalUrl();
		}
		return originalUrl;
	}

	/**
	 * @return the post parameters of thе request when the interception happened
	 * or {@code null} if there was no interception yet
	 */
	public static Map> getOriginalPostParameters()
	{
		Map> postParameters = null;
		InterceptData data = InterceptData.get();
		if (data != null)
		{
			postParameters = data.getPostParameters();
		}
		return postParameters;
	}

	/**
	 * INTERNAL CLASS, DO NOT USE
	 * 
	 * @author igor.vaynberg
	 */
	static class InterceptData implements Serializable
	{
		private static final long serialVersionUID = 1L;

		private Url originalUrl;
		private Map> postParameters;

		public Url getOriginalUrl()
		{
			return originalUrl;
		}

		public Map> getPostParameters()
		{
			return postParameters;
		}

		public static void set()
		{
			Session session = Session.get();
			session.bind();
			InterceptData data = new InterceptData();
			Request request = RequestCycle.get().getRequest();
			data.originalUrl = request.getOriginalUrl();
			Iterator itor = data.originalUrl.getQueryParameters().iterator();
			while (itor.hasNext())
			{
				QueryParameter parameter = itor.next();
				String parameterName = parameter.getName();
				if (WebRequest.PARAM_AJAX.equals(parameterName) ||
					WebRequest.PARAM_AJAX_BASE_URL.equals(parameterName) ||
					WebRequest.PARAM_AJAX_REQUEST_ANTI_CACHE.equals(parameterName))
				{
					itor.remove();
				}
			}

			data.postParameters = new HashMap<>();
			for (String s : request.getPostParameters().getParameterNames())
			{
				if (WebRequest.PARAM_AJAX.equals(s) || WebRequest.PARAM_AJAX_BASE_URL.equals(s) ||
					WebRequest.PARAM_AJAX_REQUEST_ANTI_CACHE.equals(s))
				{
					continue;
				}
				data.postParameters.put(s, new ArrayList<>(request.getPostParameters()
					.getParameterValues(s)));
			}
			session.setMetaData(key, data);
		}

		public static InterceptData get()
		{
			if (Session.exists())
			{
				return Session.get().getMetaData(key);
			}
			return null;
		}

		public static void clear()
		{
			if (Session.exists())
			{
				Session.get().setMetaData(key, null);
			}
		}

		private static final MetaDataKey key = new MetaDataKey()
		{
			private static final long serialVersionUID = 1L;
		};
	}

	static void continueToOriginalDestination()
	{
		InterceptData data = InterceptData.get();
		if (data != null)
		{
			String url = RequestCycle.get().getUrlRenderer().renderUrl(data.originalUrl);
			throw new NonResettingRestartException(url);
		}
	}

	static void clearOriginalDestination()
	{
		InterceptData.clear();
	}

	static IRequestMapper MAPPER = new IRequestMapper()
	{
		@Override
		public int getCompatibilityScore(Request request)
		{
			return matchedData(request) != null ? Integer.MAX_VALUE : 0;
		}

		@Override
		public Url mapHandler(IRequestHandler requestHandler)
		{
			return null;
		}

		@Override
		public IRequestHandler mapRequest(Request request)
		{
			InterceptData data = matchedData(request);
			if (data != null)
			{
				if (data.postParameters.isEmpty() == false &&
					request.getPostParameters() instanceof IWritableRequestParameters)
				{
					IWritableRequestParameters parameters = (IWritableRequestParameters)request.getPostParameters();
					parameters.reset();
					for (String s : data.postParameters.keySet())
					{
						parameters.setParameterValues(s, data.postParameters.get(s));
					}
				}
				InterceptData.clear();
			}
			return null;
		}

		private InterceptData matchedData(Request request)
		{
			InterceptData data = InterceptData.get();
			if (data != null && data.originalUrl.equals(request.getOriginalUrl()))
			{
				return data;
			}
			return null;
		}
	};
}