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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.Iterator;
23  import java.util.LinkedHashMap;
24  import java.util.List;
25  import java.util.Locale;
26  import java.util.Map;
27  
28  import org.apache.commons.fileupload.FileItemHeaders;
29  
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32  
33  
34  
35  public class FileItemHeadersImpl implements FileItemHeaders, Serializable {
36  
37      
38  
39  
40      private static final long serialVersionUID = -4455695752627032559L;
41  
42      
43  
44  
45  
46      private final Map<String, List<String>> headerNameToValueListMap = new LinkedHashMap<String, List<String>>();
47  
48      
49  
50  
51      @Override
52      public String getHeader(String name) {
53          String nameLower = name.toLowerCase(Locale.ENGLISH);
54          List<String> headerValueList = headerNameToValueListMap.get(nameLower);
55          if (null == headerValueList) {
56              return null;
57          }
58          return headerValueList.get(0);
59      }
60  
61      
62  
63  
64      @Override
65      public Iterator<String> getHeaderNames() {
66          return headerNameToValueListMap.keySet().iterator();
67      }
68  
69      
70  
71  
72      @Override
73      public Iterator<String> getHeaders(String name) {
74          String nameLower = name.toLowerCase(Locale.ENGLISH);
75          List<String> headerValueList = headerNameToValueListMap.get(nameLower);
76          if (null == headerValueList) {
77              headerValueList = Collections.emptyList();
78          }
79          return headerValueList.iterator();
80      }
81  
82      
83  
84  
85  
86  
87  
88      public synchronized void addHeader(String name, String value) {
89          String nameLower = name.toLowerCase(Locale.ENGLISH);
90          List<String> headerValueList = headerNameToValueListMap.get(nameLower);
91          if (null == headerValueList) {
92              headerValueList = new ArrayList<String>();
93              headerNameToValueListMap.put(nameLower, headerValueList);
94          }
95          headerValueList.add(value);
96      }
97  
98  }