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17 package org.apache.commons.fileupload.util;
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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;
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28 import org.apache.commons.fileupload.FileItemHeaders;
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35 public class FileItemHeadersImpl implements FileItemHeaders, Serializable {
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40 private static final long serialVersionUID = -4455695752627032559L;
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46 private final Map<String, List<String>> headerNameToValueListMap = new LinkedHashMap<>();
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51 public FileItemHeadersImpl() {
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53 }
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61 public synchronized void addHeader(final String name, final String value) {
62 final String nameLower = name.toLowerCase(Locale.ROOT);
63 List<String> headerValueList = headerNameToValueListMap.get(nameLower);
64 if (null == headerValueList) {
65 headerValueList = new ArrayList<>();
66 headerNameToValueListMap.put(nameLower, headerValueList);
67 }
68 headerValueList.add(value);
69 }
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71 @Override
72 public String getHeader(final String name) {
73 final String nameLower = name.toLowerCase(Locale.ROOT);
74 final List<String> headerValueList = headerNameToValueListMap.get(nameLower);
75 if (null == headerValueList) {
76 return null;
77 }
78 return headerValueList.get(0);
79 }
80
81 @Override
82 public Iterator<String> getHeaderNames() {
83 return headerNameToValueListMap.keySet().iterator();
84 }
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86 @Override
87 public Iterator<String> getHeaders(final String name) {
88 final String nameLower = name.toLowerCase(Locale.ROOT);
89 List<String> headerValueList = headerNameToValueListMap.get(nameLower);
90 if (null == headerValueList) {
91 headerValueList = Collections.emptyList();
92 }
93 return headerValueList.iterator();
94 }
95
96 }