001    /**
002     * Copyright (c) 2000-2012 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;
016    
017    import com.liferay.portal.kernel.util.AutoResetThreadLocal;
018    
019    import java.io.Closeable;
020    
021    import java.util.Enumeration;
022    
023    import javax.servlet.ServletRequest;
024    import javax.servlet.ServletRequestWrapper;
025    import javax.servlet.http.HttpServletRequest;
026    import javax.servlet.http.HttpServletRequestWrapper;
027    
028    /**
029     * @author Shuyang Zhou
030     */
031    public class ThreadLocalFacadeHttpServletRequestWrapper
032            extends HttpServletRequestWrapper implements Closeable {
033    
034            public ThreadLocalFacadeHttpServletRequestWrapper(
035                    ServletRequestWrapper servletRequestWrapper,
036                    HttpServletRequest httpServletRequest) {
037    
038                    super(httpServletRequest);
039    
040                    _servletRequestWrapper = servletRequestWrapper;
041    
042                    _nextHttpServletRequestThreadLocal.set(httpServletRequest);
043            }
044    
045            public void close() {
046                    if (_servletRequestWrapper != null) {
047                            HttpServletRequest nextHttpServletRequest =
048                                    _nextHttpServletRequestThreadLocal.get();
049    
050                            _servletRequestWrapper.setRequest(nextHttpServletRequest);
051                    }
052            }
053    
054            @Override
055            public Object getAttribute(String name) {
056                    ServletRequest servletRequest = getRequest();
057    
058                    return servletRequest.getAttribute(name);
059            }
060    
061            @Override
062            public Enumeration<String> getAttributeNames() {
063                    ServletRequest servletRequest = getRequest();
064    
065                    return servletRequest.getAttributeNames();
066            }
067    
068            @Override
069            public ServletRequest getRequest() {
070                    return _nextHttpServletRequestThreadLocal.get();
071            }
072    
073            @Override
074            public void removeAttribute(String name) {
075                    ServletRequest servletRequest = getRequest();
076    
077                    servletRequest.removeAttribute(name);
078            }
079    
080            @Override
081            public void setAttribute(String name, Object o) {
082                    ServletRequest servletRequest = getRequest();
083    
084                    servletRequest.setAttribute(name, o);
085            }
086    
087            @Override
088            public void setRequest(ServletRequest request) {
089                    _nextHttpServletRequestThreadLocal.set((HttpServletRequest)request);
090            }
091    
092            private static ThreadLocal<HttpServletRequest>
093                    _nextHttpServletRequestThreadLocal =
094                            new AutoResetThreadLocal<HttpServletRequest>(
095                                    ThreadLocalFacadeHttpServletRequestWrapper.class +
096                                            "._nextHttpServletRequestThreadLocal") {
097    
098                                    @Override
099                                    protected HttpServletRequest copy(
100                                            HttpServletRequest httpServletRequest) {
101    
102                                            return httpServletRequest;
103                                    }
104    
105                            };
106    
107            private ServletRequestWrapper _servletRequestWrapper;
108    
109    }