Java tutorial
/** * This file Copyright (c) 2003-2012 Magnolia International * Ltd. (http://www.magnolia-cms.com). All rights reserved. * * * This file is dual-licensed under both the Magnolia * Network Agreement and the GNU General Public License. * You may elect to use one or the other of these licenses. * * This file is distributed in the hope that it will be * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. * Redistribution, except as permitted by whichever of the GPL * or MNA you select, is prohibited. * * 1. For the GPL license (GPL), you can redistribute and/or * modify this file under the terms of the GNU General * Public License, Version 3, as published by the Free Software * Foundation. You should have received a copy of the GNU * General Public License, Version 3 along with this program; * if not, write to the Free Software Foundation, Inc., 51 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * 2. For the Magnolia Network Agreement (MNA), this file * and the accompanying materials are made available under the * terms of the MNA which accompanies this distribution, and * is available at http://www.magnolia-cms.com/mna.html * * Any modifications to this file must keep this entire header * intact. * */ package info.magnolia.cms.filters; import info.magnolia.cms.beans.config.VirtualURIManager; import info.magnolia.cms.core.AggregationState; import info.magnolia.cms.util.RequestDispatchUtil; import info.magnolia.context.MgnlContext; import java.io.IOException; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * Handle redirects configured using VirtualURIMappings. * * @author Fabrizio Giustina * @version $Id$ * @see info.magnolia.cms.beans.config.VirtualURIMapping */ public class VirtualUriFilter extends AbstractMgnlFilter { private static final Logger log = LoggerFactory.getLogger(VirtualUriFilter.class); @Override public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException { final AggregationState aggregationState = MgnlContext.getAggregationState(); String targetUri = getURIMapping(aggregationState.getCurrentURI(), aggregationState.getQueryString()); if (StringUtils.isEmpty(targetUri)) { chain.doFilter(request, response); return; } if (response.isCommitted()) { log.warn("Response is already committed, cannot apply virtual URI {} (original URI was {})", targetUri, request.getRequestURI()); chain.doFilter(request, response); return; } if (RequestDispatchUtil.dispatch(targetUri, request, response)) { return; } aggregationState.setCurrentURI(targetUri); chain.doFilter(request, response); } /** * @return URI mapping as in ServerInfo */ protected String getURIMapping(String currentURI) { return VirtualURIManager.getInstance().getURIMapping(currentURI); } /** * @return URI mapping as in ServerInfo */ protected String getURIMapping(String currentURI, String queryString) { return VirtualURIManager.getInstance().getURIMapping(currentURI, queryString); } }