001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.fileupload.util; 018 019import java.io.Serializable; 020import java.util.ArrayList; 021import java.util.Collections; 022import java.util.Iterator; 023import java.util.LinkedHashMap; 024import java.util.List; 025import java.util.Locale; 026import java.util.Map; 027 028import org.apache.commons.fileupload.FileItemHeaders; 029 030/** 031 * Default implementation of the {@link FileItemHeaders} interface. 032 * 033 * @since 1.2.1 034 */ 035public class FileItemHeadersImpl implements FileItemHeaders, Serializable { 036 037 /** 038 * Serial version UID, being used, if serialized. 039 */ 040 private static final long serialVersionUID = -4455695752627032559L; 041 042 /** 043 * Map of {@code String} keys to a {@code List} of 044 * {@code String} instances. 045 */ 046 private final Map<String, List<String>> headerNameToValueListMap = new LinkedHashMap<>(); 047 048 /** 049 * Constructs a new instance. 050 */ 051 public FileItemHeadersImpl() { 052 // empty 053 } 054 055 /** 056 * Method to add header values to this instance. 057 * 058 * @param name name of this header 059 * @param value value of this header 060 */ 061 public synchronized void addHeader(final String name, final String value) { 062 final String nameLower = name.toLowerCase(Locale.ROOT); 063 List<String> headerValueList = headerNameToValueListMap.get(nameLower); 064 if (null == headerValueList) { 065 headerValueList = new ArrayList<>(); 066 headerNameToValueListMap.put(nameLower, headerValueList); 067 } 068 headerValueList.add(value); 069 } 070 071 @Override 072 public String getHeader(final String name) { 073 final String nameLower = name.toLowerCase(Locale.ROOT); 074 final List<String> headerValueList = headerNameToValueListMap.get(nameLower); 075 if (null == headerValueList) { 076 return null; 077 } 078 return headerValueList.get(0); 079 } 080 081 @Override 082 public Iterator<String> getHeaderNames() { 083 return headerNameToValueListMap.keySet().iterator(); 084 } 085 086 @Override 087 public Iterator<String> getHeaders(final String name) { 088 final String nameLower = name.toLowerCase(Locale.ROOT); 089 List<String> headerValueList = headerNameToValueListMap.get(nameLower); 090 if (null == headerValueList) { 091 headerValueList = Collections.emptyList(); 092 } 093 return headerValueList.iterator(); 094 } 095 096}