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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</code> keys to a <code>List</code> of
    44       * <code>String</code> instances.
    45       */
    46      private final Map<String, List<String>> headerNameToValueListMap = new LinkedHashMap<String, List<String>>();
    47
    48      /**
    49       * {@inheritDoc}
    50       */
    51      public String getHeader(String name) {
    52          String nameLower = name.toLowerCase(Locale.ENGLISH);
    53          List<String> headerValueList = headerNameToValueListMap.get(nameLower);
    54          if (null == headerValueList) {
    55              return null;
    56          }
    57          return headerValueList.get(0);
    58      }
    59
    60      /**
    61       * {@inheritDoc}
    62       */
    63      public Iterator<String> getHeaderNames() {
    64          return headerNameToValueListMap.keySet().iterator();
    65      }
    66
    67      /**
    68       * {@inheritDoc}
    69       */
    70      public Iterator<String> getHeaders(String name) {
    71          String nameLower = name.toLowerCase(Locale.ENGLISH);
    72          List<String> headerValueList = headerNameToValueListMap.get(nameLower);
    73          if (null == headerValueList) {
    74              headerValueList = Collections.emptyList();
    75          }
    76          return headerValueList.iterator();
    77      }
    78
    79      /**
    80       * Method to add header values to this instance.
    81       *
    82       * @param name name of this header
    83       * @param value value of this header
    84       */
    85      public synchronized void addHeader(String name, String value) {
    86          String nameLower = name.toLowerCase(Locale.ENGLISH);
    87          List<String> headerValueList = headerNameToValueListMap.get(nameLower);
    88          if (null == headerValueList) {
    89              headerValueList = new ArrayList<String>();
    90              headerNameToValueListMap.put(nameLower, headerValueList);
    91          }
    92          headerValueList.add(value);
    93      }
    94
    95  }