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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  package org.apache.shiro.guice.web;
20  
21  import javax.servlet.*;
22  import java.io.IOException;
23  import java.util.Iterator;
24  
25  class SimpleFilterChain implements FilterChain {
26  
27  
28      private final FilterChain originalChain;
29      private final Iterator<? extends Filter> chain;
30  
31      private boolean originalCalled = false;
32  
33      public SimpleFilterChain(FilterChain originalChain, Iterator<? extends Filter> chain) {
34          this.originalChain = originalChain;
35          this.chain = chain;
36      }
37  
38      public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {
39          if (chain.hasNext()) {
40              Filter filter = chain.next();
41              filter.doFilter(request, response, this);
42          } else if (!originalCalled) {
43              originalCalled = true;
44              originalChain.doFilter(request, response);
45          }
46      }
47  }