FilterChain


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