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    //
021    // This source code implements specifications defined by the Java
022    // Community Process. In order to remain compliant with the specification
023    // DO NOT add / change / or delete method signatures!
024    //
025    
026    package javax.servlet;
027    
028    import java.io.IOException;
029    
030    /**
031     * A FilterChain is an object provided by the servlet container to the developer
032     * giving a view into the invocation chain of a filtered request for a resource. Filters
033     * use the FilterChain to invoke the next filter in the chain, or if the calling filter
034     * is the last filter in the chain, to invoke the rosource at the end of the chain.
035     *
036     * @see Filter
037     * @since Servlet 2.3
038     *
039     * @version $Rev: 467553 $ $Date: 2006-10-24 21:01:51 -0700 (Tue, 24 Oct 2006) $
040     */
041    public interface FilterChain {
042        /**
043         * Causes the next filter in the chain to be invoked, or if the calling filter is the last filter
044         * in the chain, causes the resource at the end of the chain to be invoked.
045         *
046         * @param request the request to pass along the chain.
047         * @param response the response to pass along the chain.
048         *
049         * @since Servlet 2.3
050         */
051        public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException;
052    }
053