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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      @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       * {@inheritDoc}
    63       */
    64      @Override
    65      public Iterator<String> getHeaderNames() {
    66          return headerNameToValueListMap.keySet().iterator();
    67      }
    68
    69      /**
    70       * {@inheritDoc}
    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       * Method to add header values to this instance.
    84       *
    85       * @param name name of this header
    86       * @param value value of this header
    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  }