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;
016    
017    import com.liferay.portal.kernel.util.AutoResetThreadLocal;
018    
019    import java.io.Closeable;
020    
021    import java.util.ArrayList;
022    import java.util.Collections;
023    import java.util.Enumeration;
024    import java.util.List;
025    import java.util.Locale;
026    
027    import javax.servlet.ServletRequest;
028    import javax.servlet.ServletRequestWrapper;
029    
030    /**
031     * @author Shuyang Zhou
032     */
033    public class ThreadLocalFacadeServletRequestWrapper
034            extends ServletRequestWrapper implements Closeable {
035    
036            public ThreadLocalFacadeServletRequestWrapper(
037                    ServletRequestWrapper servletRequestWrapper,
038                    ServletRequest nextServletRequest) {
039    
040                    super(nextServletRequest);
041    
042                    _servletRequestWrapper = servletRequestWrapper;
043    
044                    _nextServletRequestThreadLocal.set(nextServletRequest);
045    
046                    _locales = new ArrayList<Locale>();
047    
048                    Enumeration<Locale> enumeration = nextServletRequest.getLocales();
049    
050                    while (enumeration.hasMoreElements()) {
051                            _locales.add(enumeration.nextElement());
052                    }
053            }
054    
055            public void close() {
056                    if (_servletRequestWrapper != null) {
057                            ServletRequest nextServletRequest =
058                                    _nextServletRequestThreadLocal.get();
059    
060                            _servletRequestWrapper.setRequest(nextServletRequest);
061                    }
062            }
063    
064            @Override
065            public Object getAttribute(String name) {
066                    ServletRequest servletRequest = getRequest();
067    
068                    return servletRequest.getAttribute(name);
069            }
070    
071            @Override
072            public Enumeration<String> getAttributeNames() {
073                    ServletRequest servletRequest = getRequest();
074    
075                    return servletRequest.getAttributeNames();
076            }
077    
078            @Override
079            public Enumeration<Locale> getLocales() {
080                    return Collections.enumeration(_locales);
081            }
082    
083            @Override
084            public ServletRequest getRequest() {
085                    return _nextServletRequestThreadLocal.get();
086            }
087    
088            @Override
089            public void removeAttribute(String name) {
090                    ServletRequest servletRequest = getRequest();
091    
092                    servletRequest.removeAttribute(name);
093            }
094    
095            @Override
096            public void setAttribute(String name, Object o) {
097                    ServletRequest servletRequest = getRequest();
098    
099                    servletRequest.setAttribute(name, o);
100            }
101    
102            @Override
103            public void setRequest(ServletRequest servletRequest) {
104                    _nextServletRequestThreadLocal.set(servletRequest);
105            }
106    
107            private static ThreadLocal<ServletRequest> _nextServletRequestThreadLocal =
108                    new AutoResetThreadLocal<ServletRequest>(
109                            ThreadLocalFacadeServletRequestWrapper.class +
110                                    "._nextServletRequestThreadLocal") {
111    
112                            @Override
113                            protected ServletRequest copy(ServletRequest servletRequest) {
114                                    return servletRequest;
115                            }
116    
117                    };
118    
119            private List<Locale> _locales;
120            private ServletRequestWrapper _servletRequestWrapper;
121    
122    }