001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *  http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing,
013     * software distributed under the License is distributed on an
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     * KIND, either express or implied.  See the License for the
016     * specific language governing permissions and limitations
017     * under the License.
018     */
019    
020    package javax.servlet;
021    
022    import java.io.IOException;
023    
024        /**
025        * A FilterChain is an object provided by the servlet container to the developer
026        * giving a view into the invocation chain of a filtered request for a resource. Filters
027        * use the FilterChain to invoke the next filter in the chain, or if the calling filter
028        * is the last filter in the chain, to invoke the resource at the end of the chain.
029        *
030        * @see Filter
031        * @since Servlet 2.3
032        **/
033    
034    public interface FilterChain {
035            
036            /**
037            * Causes the next filter in the chain to be invoked, or if the calling filter is the last filter
038            * in the chain, causes the resource at the end of the chain to be invoked.
039            *
040            * @param request the request to pass along the chain.
041            * @param response the response to pass along the chain.
042            *
043            * @since 2.3
044            */
045            
046        public void doFilter ( ServletRequest request, ServletResponse response ) throws IOException, ServletException;
047    
048    }
049