/*
* 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.mapper;
import org.apache.wicket.Application;
import org.apache.wicket.Session;
import org.apache.wicket.protocol.http.BufferedWebResponse;
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.request.IRequestCycle;
import org.apache.wicket.request.IRequestHandler;
import org.apache.wicket.request.IRequestMapper;
import org.apache.wicket.request.Request;
import org.apache.wicket.request.Url;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.handler.BufferedResponseRequestHandler;
import org.apache.wicket.session.ISessionStore;
import org.apache.wicket.util.string.Strings;
/**
* Encoder that intercepts requests for which there is already stored buffer with rendered data.
*
* @author Matej Knopp
*/
public class BufferedResponseMapper implements IRequestMapper
{
/**
* Construct.
*/
public BufferedResponseMapper()
{
}
/**
* @return the current session id for stateful pages and <code>null</code> for stateless pages
* and non-http threads
*/
protected String getSessionId()
{
String sessionId = null;
if (Application.exists() && RequestCycle.get() != null)
{
ISessionStore sessionStore = Application.get().getSessionStore();
IRequestCycle requestCycle = RequestCycle.get();
Session session = sessionStore.lookup(requestCycle.getRequest());
if (session != null)
{
sessionId = session.getId();
}
}
return sessionId;
}
protected boolean hasBufferedResponse(Url url)
{
String sessionId = getSessionId();
boolean hasResponse = false;
if (Strings.isEmpty(sessionId) == false)
{
hasResponse = WebApplication.get().hasBufferedResponse(sessionId, url);
}
return hasResponse;
}
protected BufferedWebResponse getAndRemoveBufferedResponse(Url url)
{
String sessionId = getSessionId();
BufferedWebResponse response = null;
if (Strings.isEmpty(sessionId) == false)
{
response = WebApplication.get().getAndRemoveBufferedResponse(sessionId, url);
}
return response;
}
private Request getRequest(Request original)
{
// The buffers are stored under "real" URL which can be different
// than the URL handlers get due to global URL pre/postprocessing
// (i.e. prepending URL with language segment).
// Because of that we need find out the real URL from request cycle
if (RequestCycle.get() != null)
{
return RequestCycle.get().getRequest();
}
else
{
return original;
}
}
/**
* @see org.apache.wicket.request.IRequestMapper#mapRequest(org.apache.wicket.request.Request)
*/
public IRequestHandler mapRequest(Request request)
{
request = getRequest(request);
BufferedWebResponse response = getAndRemoveBufferedResponse(request.getUrl());
if (response != null)
{
return new BufferedResponseRequestHandler(response);
}
else
{
return null;
}
}
/**
* @see org.apache.wicket.request.IRequestMapper#mapHandler(org.apache.wicket.request.IRequestHandler)
*/
public Url mapHandler(IRequestHandler requestHandler)
{
return null;
}
/**
* @see org.apache.wicket.request.IRequestMapper#getCompatibilityScore(org.apache.wicket.request.Request)
*/
public int getCompatibilityScore(Request request)
{
request = getRequest(request);
if (hasBufferedResponse(request.getUrl()))
{
return Integer.MAX_VALUE;
}
else
{
return 0;
}
}
}