001    /**
002     * Copyright (c) 2000-2011 Liferay, Inc. All rights reserved.
003     *
004     * The contents of this file are subject to the terms of the Liferay Enterprise
005     * Subscription License ("License"). You may not use this file except in
006     * compliance with the License. You can obtain a copy of the License by
007     * contacting Liferay, Inc. See the License for the specific language governing
008     * permissions and limitations under the License, including but not limited to
009     * distribution rights of the Software.
010     *
011     *
012     *
013     */
014    
015    package com.liferay.portal.kernel.servlet;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    
020    import java.util.Map;
021    import java.util.Set;
022    import java.util.concurrent.ConcurrentHashMap;
023    
024    import javax.servlet.ServletContext;
025    
026    /**
027     * @author Brian Wing Shun Chan
028     */
029    public class ServletContextPool {
030    
031            public static void clear() {
032                    _instance._servletContexts.clear();
033            }
034    
035            public static boolean containsKey(String servletContextName) {
036                    return _instance._containsKey(servletContextName);
037            }
038    
039            public static ServletContext get(String servletContextName) {
040                    return _instance._get(servletContextName);
041            }
042    
043            public static Set<String> keySet() {
044                    return _instance._keySet();
045            }
046    
047            public static void put(
048                    String servletContextName, ServletContext servletContext) {
049    
050                    _instance._put(servletContextName, servletContext);
051            }
052    
053            public static ServletContext remove(String servletContextName) {
054                    return _instance._remove(servletContextName);
055            }
056    
057            private ServletContextPool() {
058                    _servletContexts = new ConcurrentHashMap<String, ServletContext>();
059            }
060    
061            private boolean _containsKey(String servletContextName) {
062                    boolean value = _servletContexts.containsKey(servletContextName);
063    
064                    if (_log.isDebugEnabled()) {
065                            _log.debug("Contains key " + servletContextName + " " + value);
066                    }
067    
068                    return value;
069            }
070    
071            private ServletContext _get(String servletContextName) {
072                    ServletContext servletContext = _servletContexts.get(
073                            servletContextName);
074    
075                    if (_log.isDebugEnabled()) {
076                            _log.debug("Get " + servletContextName + " " + servletContext);
077                    }
078    
079                    return servletContext;
080            }
081    
082            private Set<String> _keySet() {
083                    return _servletContexts.keySet();
084            }
085    
086            private void _put(
087                    String servletContextName, ServletContext servletContext) {
088    
089                    if (_log.isDebugEnabled()) {
090                            _log.debug("Put " + servletContextName + " " + servletContext);
091                    }
092    
093                    _servletContexts.put(servletContextName, servletContext);
094            }
095    
096            private ServletContext _remove(String servletContextName) {
097                    ServletContext servletContext = _servletContexts.remove(
098                            servletContextName);
099    
100                    if (_log.isDebugEnabled()) {
101                            _log.debug("Remove " + servletContextName + " " + servletContext);
102                    }
103    
104                    return servletContext;
105            }
106    
107            private static Log _log = LogFactoryUtil.getLog(ServletContextPool.class);
108    
109            private static ServletContextPool _instance = new ServletContextPool();
110    
111            private Map<String, ServletContext> _servletContexts;
112    
113    }