001    /**
002     * Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.servlet.filters.weblogic;
016    
017    import com.liferay.portal.kernel.servlet.MetaInfoCacheServletResponse;
018    import com.liferay.portal.kernel.servlet.WrapHttpServletResponseFilter;
019    import com.liferay.portal.kernel.util.ServerDetector;
020    import com.liferay.portal.servlet.filters.BasePortalFilter;
021    
022    import javax.servlet.http.HttpServletRequest;
023    import javax.servlet.http.HttpServletResponse;
024    import javax.servlet.http.HttpServletResponseWrapper;
025    
026    /**
027     * @author Minhchau Dang
028     */
029    public class WebLogicIncludeFilter
030            extends BasePortalFilter implements WrapHttpServletResponseFilter {
031    
032            @Override
033            public HttpServletResponse getWrappedHttpServletResponse(
034                    HttpServletRequest request, HttpServletResponse response) {
035    
036                    if (isWrap(response)) {
037                            return new WebLogicIncludeServletResponse(response);
038                    }
039    
040                    return response;
041            }
042    
043            @Override
044            public boolean isFilterEnabled() {
045                    return ServerDetector.isWebLogic();
046            }
047    
048            protected boolean isWrap(HttpServletResponse response) {
049                    if (response instanceof WebLogicIncludeServletResponse) {
050                            return false;
051                    }
052    
053                    boolean wrap = false;
054    
055                    HttpServletResponseWrapper previousResponseWrapper = null;
056    
057                    while (response instanceof HttpServletResponseWrapper) {
058                            if (!wrap && (response instanceof MetaInfoCacheServletResponse)) {
059                                    wrap = true;
060                            }
061    
062                            HttpServletResponseWrapper responseWrapper =
063                                    (HttpServletResponseWrapper)response;
064    
065                            response = (HttpServletResponse)responseWrapper.getResponse();
066    
067                            if (responseWrapper instanceof WebLogicIncludeServletResponse) {
068                                    previousResponseWrapper.setResponse(response);
069                            }
070    
071                            previousResponseWrapper = responseWrapper;
072                    }
073    
074                    return wrap;
075            }
076    
077    }