| /* |
| * 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 org.apache.catalina.filters; |
| |
| import java.io.IOException; |
| |
| import javax.servlet.Filter; |
| import javax.servlet.FilterChain; |
| import javax.servlet.FilterConfig; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.ServletResponse; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpSession; |
| |
| /** |
| * A {@link javax.servlet.Filter} that initializes the {@link HttpSession} for |
| * the {@link HttpServletRequest} by calling its getSession() method. |
| * <p> |
| * This is required for some operations with WebSocket requests, where it is |
| * too late to initialize the HttpSession object, and the current Java WebSocket |
| * specification does not provide a way to do so. |
| */ |
| public class SessionInitializerFilter implements Filter { |
| |
| /** |
| * Calls {@link HttpServletRequest}'s getSession() to initialize the |
| * HttpSession and continues processing the chain. |
| * |
| * @param request The request to process |
| * @param response The response associated with the request |
| * @param chain Provides access to the next filter in the chain for this |
| * filter to pass the request and response to for further |
| * processing |
| * @throws IOException if an I/O error occurs during this filter's |
| * processing of the request |
| * @throws ServletException if the processing fails for any other reason |
| */ |
| @Override |
| public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) |
| throws IOException, ServletException { |
| |
| ((HttpServletRequest)request).getSession(); |
| |
| chain.doFilter(request, response); |
| } |
| |
| |
| @Override |
| public void init(FilterConfig filterConfig) throws ServletException { |
| // NO-OP |
| } |
| |
| @Override |
| public void destroy() { |
| // NO-OP |
| } |
| } |