/*
    * 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.commons.chain.web.servlet;
  
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Enumeration;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import javax.servlet.http.HttpServletRequest;
  import org.apache.commons.chain.web.MapEntry;
  
  
  /**
   * <p>Private implementation of <code>Map</code> for servlet request
   * name-values[].</p>
   *
   * @author Craig R. McClanahan
   * @version $Revision: 480477 $ $Date: 2006-11-29 08:34:52 +0000 (Wed, 29 Nov 2006) $
   */
  
  final class ServletHeaderValuesMap implements Map {
  
  
      public ServletHeaderValuesMap(HttpServletRequest request) {
          this.request = request;
      }
  
  
      private HttpServletRequest request = null;
  
  
      public void clear() {
          throw new UnsupportedOperationException();
      }
  
  
      public boolean containsKey(Object key) {
          return (request.getHeader(key(key)) != null);
      }
  
  
      public boolean containsValue(Object value) {
          if (!(value instanceof String[])) {
              return (false);
          }
          String[] test = (String[]) value;
          Iterator values = values().iterator();
          while (values.hasNext()) {
              String[] actual = (String[]) values.next();
              if (test.length == actual.length) {
                  boolean matched = true;
                  for (int i = 0; i < test.length; i++) {
                      if (!test[i].equals(actual[i])) {
                          matched = false;
                          break;
                      }
                  }
                  if (matched) {
                      return (true);
                  }
              }
          }
          return (false);
      }
  
  
      public Set entrySet() {
          Set set = new HashSet();
          Enumeration keys = request.getHeaderNames();
          String key;
          while (keys.hasMoreElements()) {
              key = (String) keys.nextElement();
              set.add(new MapEntry(key, request.getHeaders(key), false));
          }
          return (set);
      }
  
  
      public boolean equals(Object o) {
          return (request.equals(o));
     }
 
 
     public Object get(Object key) {
         List list = new ArrayList();
         Enumeration values = request.getHeaders(key(key));
         while (values.hasMoreElements()) {
             list.add((String) values.nextElement());
         }
         return (((String[]) list.toArray(new String[list.size()])));
     }
 
 
     public int hashCode() {
         return (request.hashCode());
     }
 
 
     public boolean isEmpty() {
         return (size() < 1);
     }
 
 
     public Set keySet() {
         Set set = new HashSet();
         Enumeration keys = request.getHeaderNames();
         while (keys.hasMoreElements()) {
             set.add(keys.nextElement());
         }
         return (set);
     }
 
 
     public Object put(Object key, Object value) {
         throw new UnsupportedOperationException();
     }
 
 
     public void putAll(Map map) {
         throw new UnsupportedOperationException();
     }
 
 
     public Object remove(Object key) {
         throw new UnsupportedOperationException();
     }
 
 
     public int size() {
         int n = 0;
         Enumeration keys = request.getHeaderNames();
         while (keys.hasMoreElements()) {
             keys.nextElement();
             n++;
         }
         return (n);
     }
 
 
     public Collection values() {
         List list = new ArrayList();
         Enumeration keys = request.getHeaderNames();
         while (keys.hasMoreElements()) {
             String key = (String) keys.nextElement();
             List list1 = new ArrayList();
             Enumeration values = request.getHeaders(key);
             while (values.hasMoreElements()) {
                 list1.add((String) values.nextElement());
             }
             list.add(((String[]) list1.toArray(new String[list1.size()])));
         }
         return (list);
     }
 
 
     private String key(Object key) {
         if (key == null) {
             throw new IllegalArgumentException();
         } else if (key instanceof String) {
             return ((String) key);
         } else {
             return (key.toString());
         }
     }
 
 
 }