server/src/main/java/org/apache/abdera/protocol/server/FilterChain.java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  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.  For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.protocol.server;

import java.util.Arrays;
import java.util.Iterator;

public final class FilterChain {

  private final Iterator<Filter> filters;
  private final Provider provider;
  
  public FilterChain( 
    Provider provider,
    RequestContext request) {
      this.provider = provider;
      this.filters = 
        Arrays.asList(
          provider.getFilters(request)).iterator();
  }

  /**
   * Invoke the next filter in the chain.  If there are no more filters in 
   * the chain, pass the request context on to the Provider for processing.
   */
  public ResponseContext next(RequestContext request) {
    return filters.hasNext() ?
      filters.next().filter(request, this) :
      provider.process(request);
  }
  
}