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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.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
    30  /**
    31   * Default implementation of the {@link FileItemHeaders} interface.
    32   *
    33   * @since 1.2.1
    34   */
    35  public class FileItemHeadersImpl implements FileItemHeaders, Serializable {
    36
    37      /**
    38       * Serial version UID, being used, if serialized.
    39       */
    40      private static final long serialVersionUID = -4455695752627032559L;
    41
    42      /**
    43       * Map of {@code String} keys to a {@code List} of
    44       * {@code String} instances.
    45       */
    46      private final Map<String, List<String>> headerNameToValueListMap = new LinkedHashMap<>();
    47
    48      /**
    49       * Constructs a new instance.
    50       */
    51      public FileItemHeadersImpl() {
    52          // empty
    53      }
    54
    55      /**
    56       * Method to add header values to this instance.
    57       *
    58       * @param name name of this header
    59       * @param value value of this header
    60       */
    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      }
    70
    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      }
    85
    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  }