| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package freemarker.ext.jsp; |
| |
| import java.util.ArrayList; |
| import java.util.EventListener; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import javax.servlet.ServletContext; |
| import javax.servlet.ServletContextAttributeEvent; |
| import javax.servlet.ServletContextAttributeListener; |
| import javax.servlet.ServletContextEvent; |
| import javax.servlet.ServletContextListener; |
| import javax.servlet.http.HttpSessionAttributeListener; |
| import javax.servlet.http.HttpSessionBindingEvent; |
| import javax.servlet.http.HttpSessionEvent; |
| import javax.servlet.http.HttpSessionListener; |
| |
| import freemarker.log.Logger; |
| |
| /** |
| * An instance of this class should be registered as a <code><listener></code> in |
| * the {@code web.xml} descriptor in order to correctly dispatch events to |
| * event listeners that are specified in TLD files. |
| */ |
| public class EventForwarding |
| implements |
| ServletContextAttributeListener, |
| ServletContextListener, |
| HttpSessionListener, |
| HttpSessionAttributeListener { |
| private static final Logger LOG = Logger.getLogger("freemarker.jsp"); |
| |
| private static final String ATTR_NAME = EventForwarding.class.getName(); |
| |
| private final List servletContextAttributeListeners = new ArrayList(); |
| private final List servletContextListeners = new ArrayList(); |
| private final List httpSessionAttributeListeners = new ArrayList(); |
| private final List httpSessionListeners = new ArrayList(); |
| |
| void addListeners(List listeners) { |
| for (Iterator iter = listeners.iterator(); iter.hasNext(); ) { |
| addListener((EventListener) iter.next()); |
| } |
| } |
| |
| private void addListener(EventListener listener) { |
| boolean added = false; |
| if (listener instanceof ServletContextAttributeListener) { |
| addListener(servletContextAttributeListeners, listener); |
| added = true; |
| } |
| if (listener instanceof ServletContextListener) { |
| addListener(servletContextListeners, listener); |
| added = true; |
| } |
| if (listener instanceof HttpSessionAttributeListener) { |
| addListener(httpSessionAttributeListeners, listener); |
| added = true; |
| } |
| if (listener instanceof HttpSessionListener) { |
| addListener(httpSessionListeners, listener); |
| added = true; |
| } |
| if (!added) { |
| LOG.warn( |
| "Listener of class " + listener.getClass().getName() + |
| "wasn't registered as it doesn't implement any of the " + |
| "recognized listener interfaces."); |
| } |
| } |
| |
| static EventForwarding getInstance(ServletContext context) { |
| return (EventForwarding) context.getAttribute(ATTR_NAME); |
| } |
| private void addListener(List listeners, EventListener listener) { |
| synchronized (listeners) { |
| listeners.add(listener); |
| } |
| } |
| |
| @Override |
| public void attributeAdded(ServletContextAttributeEvent arg0) { |
| synchronized (servletContextAttributeListeners) { |
| int s = servletContextAttributeListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((ServletContextAttributeListener) servletContextAttributeListeners.get(i)).attributeAdded(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void attributeRemoved(ServletContextAttributeEvent arg0) { |
| synchronized (servletContextAttributeListeners) { |
| int s = servletContextAttributeListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((ServletContextAttributeListener) servletContextAttributeListeners.get(i)).attributeRemoved(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void attributeReplaced(ServletContextAttributeEvent arg0) { |
| synchronized (servletContextAttributeListeners) { |
| int s = servletContextAttributeListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((ServletContextAttributeListener) servletContextAttributeListeners.get(i)).attributeReplaced(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void contextInitialized(ServletContextEvent arg0) { |
| arg0.getServletContext().setAttribute(ATTR_NAME, this); |
| |
| synchronized (servletContextListeners) { |
| int s = servletContextListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((ServletContextListener) servletContextListeners.get(i)).contextInitialized(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void contextDestroyed(ServletContextEvent arg0) { |
| synchronized (servletContextListeners) { |
| int s = servletContextListeners.size(); |
| for (int i = s - 1; i >= 0; --i) { |
| ((ServletContextListener) servletContextListeners.get(i)).contextDestroyed(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void sessionCreated(HttpSessionEvent arg0) { |
| synchronized (httpSessionListeners) { |
| int s = httpSessionListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((HttpSessionListener) httpSessionListeners.get(i)).sessionCreated(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void sessionDestroyed(HttpSessionEvent arg0) { |
| synchronized (httpSessionListeners) { |
| int s = httpSessionListeners.size(); |
| for (int i = s - 1; i >= 0; --i) { |
| ((HttpSessionListener) httpSessionListeners.get(i)).sessionDestroyed(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void attributeAdded(HttpSessionBindingEvent arg0) { |
| synchronized (httpSessionAttributeListeners) { |
| int s = httpSessionAttributeListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((HttpSessionAttributeListener) httpSessionAttributeListeners.get(i)).attributeAdded(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void attributeRemoved(HttpSessionBindingEvent arg0) { |
| synchronized (httpSessionAttributeListeners) { |
| int s = httpSessionAttributeListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((HttpSessionAttributeListener) httpSessionAttributeListeners.get(i)).attributeRemoved(arg0); |
| } |
| } |
| } |
| |
| @Override |
| public void attributeReplaced(HttpSessionBindingEvent arg0) { |
| synchronized (httpSessionAttributeListeners) { |
| int s = httpSessionAttributeListeners.size(); |
| for (int i = 0; i < s; ++i) { |
| ((HttpSessionAttributeListener) httpSessionAttributeListeners.get(i)).attributeReplaced(arg0); |
| } |
| } |
| } |
| } |