1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *  http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  
20  package javax.servlet;
21  
22  import java.io.IOException;
23  
24      /**
25      * A FilterChain is an object provided by the servlet container to the developer
26      * giving a view into the invocation chain of a filtered request for a resource. Filters
27      * use the FilterChain to invoke the next filter in the chain, or if the calling filter
28      * is the last filter in the chain, to invoke the resource at the end of the chain.
29      *
30      * @see Filter
31      * @since Servlet 2.3
32      **/
33  
34  public interface FilterChain {
35  	
36  	/**
37  	* Causes the next filter in the chain to be invoked, or if the calling filter is the last filter
38  	* in the chain, causes the resource at the end of the chain to be invoked.
39  	*
40  	* @param request the request to pass along the chain.
41  	* @param response the response to pass along the chain.
42  	*
43  	* @since 2.3
44  	*/
45  	
46      public void doFilter ( ServletRequest request, ServletResponse response ) throws IOException, ServletException;
47  
48  }
49