ResponseContentInterceptorChainImpl.java

/*
 * Copyright 2012 <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
 *
 * Licensed 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.ocpsoft.rewrite.servlet.impl;

import java.util.ArrayList;
import java.util.List;

import org.ocpsoft.rewrite.servlet.config.response.ResponseContent;
import org.ocpsoft.rewrite.servlet.config.response.ResponseContentInterceptor;
import org.ocpsoft.rewrite.servlet.config.response.ResponseContentInterceptorChain;
import org.ocpsoft.rewrite.servlet.http.event.HttpServletRewrite;

/**
 * @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
 */
public class ResponseContentInterceptorChainImpl implements ResponseContentInterceptorChain
{
   private List<ResponseContentInterceptor> interceptors;
   private HttpServletRewrite event;
   private ResponseContent buffer;

   public ResponseContentInterceptorChainImpl(List<ResponseContentInterceptor> responseInterceptors)
   {
      this.interceptors = new ArrayList<ResponseContentInterceptor>(responseInterceptors);
   }

   @Override
   public void proceed()
   {
      if (!interceptors.isEmpty())
      {
         ResponseContentInterceptor interceptor = interceptors.remove(0);
         interceptor.intercept(event, buffer, this);
      }
   }

   public void begin(HttpServletRewrite event, ResponseContent buffer)
   {
      this.event = event;
      this.buffer = buffer;

      interceptors.add(new ResponseContentInterceptor() {
         @Override
         public void intercept(HttpServletRewrite event, ResponseContent buffer, ResponseContentInterceptorChain chain)
         {}
      });

      proceed();
   }
}