001/*
002 * (C) Copyright 2006-2012 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Bogdan Stefanescu
018 *     Florent Guillaume
019 */
020package org.nuxeo.ecm.webengine.app;
021
022import java.io.IOException;
023
024import javax.servlet.Filter;
025import javax.servlet.FilterChain;
026import javax.servlet.FilterConfig;
027import javax.servlet.ServletException;
028import javax.servlet.ServletRequest;
029import javax.servlet.ServletResponse;
030import javax.servlet.http.HttpServletRequest;
031import javax.servlet.http.HttpServletResponse;
032
033import org.nuxeo.ecm.webengine.model.WebContext;
034
035/**
036 * This filter sets up the {@link WebContext}, made available through {@link WebEngine#getActiveContext}.
037 */
038public class WebContextFilter implements Filter {
039
040    @Override
041    public void init(FilterConfig filterConfig) {
042        // nothing to do
043    }
044
045    @Override
046    public void destroy() {
047        // nothing to do
048    }
049
050    @Override
051    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
052            throws IOException, ServletException {
053        String name = WebContext.class.getName();
054        request.setAttribute(name, new DefaultContext((HttpServletRequest) request, (HttpServletResponse) response));
055        try {
056            chain.doFilter(request, response);
057        } finally {
058            request.removeAttribute(name);
059        }
060    }
061
062}