/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you under the Apache License, Version 2.0 (the

  * "License"); you may not use this file except in compliance

  * with the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing,

  * software distributed under the License is distributed on an

  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

  * KIND, either express or implied.  See the License for the

  * specific language governing permissions and limitations

  * under the License.

  */

 package org.apache.shiro.guice.web;

 import javax.servlet.*;

 import java.io.IOException;

 import java.util.Iterator;

 class SimpleFilterChain implements FilterChain {

     private final FilterChain originalChain;

     private final Iterator<? extends Filter> chain;

     private boolean originalCalled = false;

     public SimpleFilterChain(FilterChain originalChain, Iterator<? extends Filter> chain) {

         this.originalChain = originalChain;

         this.chain = chain;

     }

     public void doFilter(ServletRequest request, ServletResponse response) throws IOException, ServletException {

         if (chain.hasNext()) {

             Filter filter = chain.next();

             filter.doFilter(request, response, this);

         } else if (!originalCalled) {

             originalCalled = true;

             originalChain.doFilter(request, response);

         }

     }

 }