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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.fileupload.util;
18  
19  import java.io.Serializable;
20  import java.util.ArrayList;
21  import java.util.Collections;
22  import java.util.HashMap;
23  import java.util.Iterator;
24  import java.util.List;
25  import java.util.Map;
26  
27  import org.apache.commons.fileupload.FileItemHeaders;
28  
29  /**
30   * Default implementation of the {@link FileItemHeaders} interface.
31   *
32   * @author Michael C. Macaluso
33   * @since 1.3
34   */
35  public class FileItemHeadersImpl implements FileItemHeaders, Serializable {
36      private static final long serialVersionUID = -4455695752627032559L;
37  
38      /**
39       * Map of <code>String</code> keys to a <code>List</code> of
40       * <code>String</code> instances.
41       */
42      private final Map headerNameToValueListMap = new HashMap();
43  
44      /**
45       * List to preserve order of headers as added.  This would not be
46       * needed if a <code>LinkedHashMap</code> could be used, but don't
47       * want to depend on 1.4.
48       */
49      private final List headerNameList = new ArrayList();
50  
51      public String getHeader(String name) {
52          String nameLower = name.toLowerCase();
53          List headerValueList = (List) headerNameToValueListMap.get(nameLower);
54          if (null == headerValueList) {
55              return null;
56          }
57          return (String) headerValueList.get(0);
58      }
59  
60      public Iterator getHeaderNames() {
61          return headerNameList.iterator();
62      }
63  
64      public Iterator getHeaders(String name) {
65          String nameLower = name.toLowerCase();
66          List headerValueList = (List) headerNameToValueListMap.get(nameLower);
67          if (null == headerValueList) {
68              return Collections.EMPTY_LIST.iterator();
69          }
70          return headerValueList.iterator();
71      }
72  
73      /**
74       * Method to add header values to this instance.
75       *
76       * @param name name of this header
77       * @param value value of this header
78       */
79      public synchronized void addHeader(String name, String value) {
80          String nameLower = name.toLowerCase();
81          List headerValueList = (List) headerNameToValueListMap.get(nameLower);
82          if (null == headerValueList) {
83              headerValueList = new ArrayList();
84              headerNameToValueListMap.put(nameLower, headerValueList);
85              headerNameList.add(nameLower);
86          }
87          headerValueList.add(value);
88      }
89  }